# diode number code

For example parameters such as the transistor being intended for low frequency power, RF, etc can be determined. How do you identify the cathode and anode terminals in the thru hole LED? In some cases, standard color code bands are placed on the cathode end of the diode. SMD Zener Diode Numbers ZM4728A TO ZM4761A 10V 12V 13V 15V 16V 18V 20V 24V 30V 33V 36V 1/2W 0.5w Chip Diode. 1N4148, 1N4733A, 1N5408, 1N5822, Zener Diodes. Multi – Colour Light Emitting Diode. The following presents the marking code for common SMD component for 2 pins diode component. Thus a device with the numbering code 1N4148 is a diode and a 2N706 is a bipolar transistor. In the early days of thermionic valve (vacuum tube) manufacture, each manufacturer gave a number to the types they manufactured. RF connectors     This post will solve that problem. In this the first letter designated the heater voltage and current, the second and subsequent letters the individual functions within the glass envelope and the remaining numbers indicated the valve based and the serial number for the type. But 4N and 5N are reserved for opto-couplers. This serves two purposes: (1) it identifies the cathode end of the diode, and (2) it also serves to identify the diode by number. Memory types     Forget transistors! Thyristor     Hours of Operation Monday - Friday 7:30 - 4:00 pst . More . I have a Diode that has failed, it is simply a almost spherical in shape, colour is creamy white with a black line at one end, there are four blue dots evenly spaced around the circumference of the white body. Our standard product mark follows our standard part number ordering information, except for those products with a speed letter code. Resistors     So, the part number is 1N758 and the datasheet is telling me 10.0v. Welcome to the Diodes Incorporated's Product Cross Reference . In fact there a few semiconductor numbering schemes in use: The aim of the the industry standard numbering schemes is to allow for the identification and description of electronic components and in this case semiconductor devices including diodes, bipolar transistors and field effect transistors, to have common electronic components and component numbering across several manufacturers. Voici comment le code fonctionne. Download datasheet; Order product; Orderable parts. That is the current should always flow from the Anode to cathode. On some occasions there may be a suffix letter that is added: This is useful to both manufacturers and users because when transistors are manufactured, there is a large spread in the levels of gain. Transistor specifications     The last color, blue, I have no idea what it's use for. Quite a numbers of engineers and technicians are confused on how to read a zener diode part number or data. Learn the simple and easy way to read zener diode code number. There are many types of code number indicated on its body. . If you took your data from both modes of operation and plotted it on a linear scale it would look similar to figure 2. So it is necessary to go through the manufacturer’s data sheets to identify the function. I did not understand the diode code identification please explain clearly dont mind, Not sure if I am geting this BZY88C4V7 is B – Silicon Z – Zener Diode C ±5% 4.7v. What does it mean? How Zener Diode works as a Voltage Regulator? M means the manufacturer is Motorola, while TI means Texas Instruments, although an A added to the part number often means a revision of the specification, e.g. Skip navigation sign in. The European System (ES) Diode Code Identification consists of an alphanumeric code as per below: [1] Two letters and three figures. Using the numbering scheme it can be seen that a transistor with the part number BC107 is a silicon low power audio transistor and a BBY10 is silicon variable capacitance diode for industrial or commercial use. Is this the correct part number? numbers: The part number and the date code. Tel: 972-987-3900 Fax: 972-731-3510 . The scheme for the numbering of semiconductor diodes, bipolar transistors and FETs was based around the format of the system developed by Mullard and Philips for thermionic valve or vacuum tube numbering that had existed since the early 1930s. Advertisement. Japanese Industrial Standard (JIS) These part numbers take the form: digit, two letters, sequential number, [optional suffix] Digits are 1 for diodes, 2 for transistors, and so forth. $0.20 per pack, or$0.02 per diode) SMD Zener Diodes Part No. A diode is a device which allows current flow through only one direction. Cross Reference information is based upon Diodes' marketing research. Marking Code searching The biggest database of Marking Code search engine in the world . SMD Code Package Device Name Manufacturer Data Datasheet; A4 SOT-23 BAV70: Fairchild (Now ON) Diodes: A4 SOT-23 BAV70: Taitron: Diodes: A4 SOT-416 BAV70T: NXP: Diodes: A4 SOT-343R BFU540: Philips (Now NXP) NPN transistor: A4 SOT-553 EMA4: ROHM: PNP digital transistors: A4 SOT-753 FMA4A: ROHM : PNP digital transistors: A4 SOT-323 MIC803-31D3VC3: Micrel: Microprocessor Reset … A rectifier diode is designed specifically for circuits that need to convert alternating current to direct current. Can you help in identifying this, I have a zener with 12.43 and 3 vertical dots. Germanium diodes have a lower forward voltage of $0.25–0.30\,\text V$. To look up a coded device, click on the first character of the device code in the table on the left. LEDs. Many technicians are confused on how to really read a zener diode code. In 1944, the Radio Manufacturers Association and the National Electronic Manufacturers Association established a body called the Joint Electron Tube Engineering Council, JETEC. ▶︎ Check our Supplier Directory, C = Transistor - audio frequency, low power, F = Transistor - high frequency, low power, R = Switching device, low power, e.g. FET     The second column in the specification sheet shows the maximum reverse voltage, VR,\{, for each of the diode types. Enter a partial or full competitor part number. They include automotive- and industrial-grade transient voltage suppressor families as well as a host of diode array products for ESD and EMI protection in portable electronics. Description. Being Schottky diodes, the 1N58xx parts have roughly half the forward voltage drop of the 1N400x/1N540x series diodes, which improves efficiency in applications where they are usually forward-biased, such as power converters. The third column shows … when searching the top mark (marking code),we will show the original model number of you are looking for . Notify me of follow-up comments by email. Take, for example, a diode with brown, orange, and white bands at one terminal and figure … The first naming method is for General purpose diodes and the second option is for special purpose diodes. Comme ce n’est pas un bouton ON/OFF, il faut gérer le changement d’état de la variable intermédiaire buttonState. There are large numbers of LEDs available in the market with varying shapes and sizes, different colours and different light output intensities. Generally in diodes, some letter with some numbers are mentioned. Our standard product mark follows our standard part number ordering information, except for those products with a speed letter code. As shown in the above figure, mostly cathode terminal is identified with the help of marking of the stripe. Transistor and diode numbering - the numbering or code systems used for transistors, diodes and FETs. It is having characteristics that closely match those of a simple switch. Notice the lines on each device, denoting the Cathode side, which match the line in the symbol above. Take the resistance code and use the color number and put "1N" in from of the code you found and you got the zener part number! At the bottom are a couple surface mount diodes, each of which use a line to mark which pin is the cathode. REMARQUE: les codes postaux qui ne peuvent pas être émis dans les régions éloignées: les codes postaux commençant par 97/98/99 sont des régions éloignées et ne peuvent pas être livrés （comme 97280 97310 98000 etc.) Where can I purchase this? Logic Gates. With the increasing use of semiconductor devices, the scope of JETEC was broadened and it was renamed JEDEC, Joint Electron Device Engineering Council in 1958. there is a guarantee that it has been manufactured under the right conditions to produce the required semiconductor device. Joint Electron Device Engineering Council (JEDEC) These part numbers take the form: digit, letter, sequential number, [suffix] The letter is always 'N', and the first digit is 1 for diodes, 2 for transistors, 3 for four-leaded devices, and so forth. Please help me any knows, Hi, diode type number to marking code type number marking code package 1n821 1n821 sod68 (do34) 1n821a 1n821a sod68 (do34) 1n823 1n823 sod68 (do34) 1n823a 1n823a sod68 (do34) 1n825 1n825 sod68 (do34) 1n825a 1n825a sod68 (do34) 1n827 1n827 sod68 (do34) 1n827a 1n827a sod68 (do34) 1n829 1n829 sod68 (do34) 1n829a 1n829a sod68 (do34) 1n914 1n914 ph sod27 (do35) 1n4148 … The output of the logic circuit is also located at that node. These semiconductor devices have different characteristics according to the way they are designed and made. Electronic Manufacturer: Part no: Datasheet: Electronics Description: Texas Instruments: DiodesInc.DFLS1100 [Old version datasheet] SM74301 100V, 350 mA Constant On-Time Buck Switching Regulator Search Partnumber : Start with "DIODE"-Total : 41 ( 1/3 Page) Contec Co., Ltd A10 - Z99. 2N2222A transistors are widely available and these are an updated version of the 2N2222. Its blocking voltage varies from 50 volts (1N4001) to 1000 volts (1N4007). There is a diode in line and it appears it’s bad, no voltage reading on volt meter in either direction, I suspect it is a voltage regulator. Some of the special diodes areZener diode, Schottky diode,Varactor Diode, Tunnel diode, Gunn Diode, Light Emitting Diode(LED) etc. The "1" indicates a diode (as opposed to "2" for a transistor and "3" for a tetrode), and the "N" identifies the component as a semiconductor. For example, a diode with yellow, green, red and violet bands would have the code 1N452G. CKT.S FOR EACH STEP...THAKNS A LOT. The top diode, a 1N4001 rectifier, has a grey ring near the cathode. (Not all manufacturers provide JEDEC numbers; many use their own commercial part numbers.) If you areunable to identify the code, do not worry as this newsletter are here to guide you to successfully on how to read the zener diode code. The DIODE dataset and the code is released using the MIT license. These diodes can pass currents of up to 1 A, and they have peak inverse voltage (PIV) ratings that range from 50 to 1,000 V. Here is a list of the peak inverse voltages for each of these common diodes. Diode, an electrical component that allows the flow of current in only one direction. 200 characters left. Note that VRM ranges from 20 V to 200 V for the diodes listed. Gain: Hfe, hfe & Beta     Those intended for domestic use have three numbers, but those intended for commercial or industrial use have letter followed by two numbers, i.e. Tolerance I guess. JEDEC, Joint Electron Device Engineering Council is an independent industry semiconductor engineering trade organisation and standardisation body. Germanium diode – Made from a different element. The European System(ES) Diode Code Identification consists of an alphanumeric code as per below: The first naming method is for General purpose diodes and the second option is for special purpose diodes. ESD Protection Diodes Provide High Surge Capability of 200 W in Low Profile SMF (DO-219AB) Package Available Available . In this way there were vast numbers of different numbers for devices many of which were virtually identical. Schottky diode – Made from direct contact between silicon and metal. Connectors     Vishay’s diode-based circuit protection products cover the full spectrum of electronic systems from industrial applications to the smallest handheld multimedia devices. The Pro-electron scheme makes it possible to broadly identify the capabilities of the transistor. and the cathode is the n-type. Notice the lines on each device, denoting the Cathode side, which match the line in the symbol above. But they are not familiar with the diode code identification. The earliest origins of JEDEC can be traced back to 1924 when the Radio Manufacturers Association was established - many years later this became the Electronic Industries Association, EIA. - Semiconductor diode markings. The Pro-electron scheme makes it possible to broadly identify the capabilities of the transistor. Examples: 1N4007, 1N914 (diode) and 2N2222, 2N3904 (transistors). Power BJT: Introduction, Structure, Characteristics. when searching the top mark (marking code),we will show the original model number of you are looking for . Code. . Diode type numbers have the prefix ‘IN, like those shown in the leftmost column of Figure 3-30. Der Farbcode lässt sich anhand der folgenden Tabelle aufschlüsseln und so den Diodentyp ermitteln. Below that, a 1N4148 signal diode uses a black ring to mark the cathode. students coming out of college are well familiar with the Resistor code identification. A diode is so-called because it has two terminals: the anode, which is the positive terminal, and the cathode, which is the negative terminal. The "1" indicates a diode (as opposed to "2" for a transistor and "3" for a tetrode), and the "N" identifies the component as a semiconductor. By looking at the transistor of diode type number, or code, to is possible to identify elements about it. Daher wird von Durchlassrichtung und Sperrrichtung gesprochen. Your email address will not be published. The 1N400x (or 1N4001 or 1N4000) series is a family of popular one-ampere general-purpose silicon rectifier diodes commonly used in AC adapters for common household appliances. The same is true for semiconductor devices, and manufacturer independent numbering schemes are used for diodes, bipolar transistors and FETs. To varying degrees these numbering schemes allow for a broad description of the function of the diode, transistor or FET. Diode comes with many varieties. A BC109C for example is a silicon low power audio transistor with a high gain. The Pro-Electron scheme providing far more information than the others. 89.2% Response Rate. 1/2. By looking at the transistor of diode type number, or code, to is possible to identify elements about it. Diodes will have certain markings to signify the part number, as well as the polarity of the device. Initially manufacturers had to give their own numbers to devices, but soon standard part numbering schemes were used for semiconductor devices including diodes, bipolar transistors and FETs - both JFETs and MOSFETs. Time and moneyare loss due to that we lack of knowledge of identify the right zener diode voltage. SMF5V0A to SMF58A www.vishay.com Vishay Semiconductors Rev. How to select a Zener Diode. If you areunable to identify the code, do not worry as this newsletter are here to guide you to successfully on how to read the zener diode code. Silicon diode code in multisim. Figure 1-26. There are many different ways of organising a numbering scheme. practicly worthless info without that! About 1% of these are electronic signs. Diodes     General Purpose Diodes, Signal Diodes, Schottky Barrier Diodes, Germanium Diode, Fast Recovery Diode, 1N4001, 1N4004, 1N4148, 1N34A Batteries     Switches     For example, through hole diodes will have numbers printed on the part and will also have a thin band at one end of the diode which signifies the cathode. The Pro-Electron numbering scheme to provide a standardised scheme for semiconductor numbering - in particular diodes, transistors and fild effect transistors was set up in 1966 at a meeting in Brussels, Belgium. The outlook and shape of a zener diode sometimes can be mistaken to be a normal 1n4148 signal diode. thyristor, triac, 2 = Bipolar transistor or single gate field effect transistor, SA = PNP high frequency bipolar transistor, SB = PNP audio frequency bipolar transistor, SC = NPN high frequency bipolar transistor, SD = NPN audio frequency bipolar transistor, SZ = Zener diode / voltage reference diode, TIP = Texas Instruments power transistor (plastic case), TIS = TI small signal transistor (plastic case). I can not find thesediodes. Choosing replacement transistors. Answer. Transistor basics     So, the part number is 1N758 and the datasheet is telling me 10.0v. Gallium Arsenide Phosphide red colored Led with the diameter of 5 mm is the most commonly used LED and it is very cheap to produce. If you took your data from both modes of operation and plotted it on a linear scale it would look similar to figure 2. Eine Diode ist ein elektronisches Bauelement, das Strom in einer Richtung passieren lässt und in der anderen Richtung den Stromfluss sperrt. Please tell me about GM 54 (look like diode) In the early days of thermionic valve (vacuum tube) manufacture, each manufacturer gave a number to the types they manufactured. These have different characteristics according to the way they are designed and made. Semiconductor Device, Diode, Silicon, Voltage Regulator: 1N962B-1 through 1N992B-1, and 1N962BUR-1 through 1N992BUR-1, 1N962C-1 through 1N992C-1, and 1N962CUR-1 … A wide variety of diode number options are available to you, such as free samples. Your email address will not be published. They can then be sorted into groups and marked according to their gain. Ideas anyone? Learn how your comment data is processed. Tolerance I guess. It soon became obvious that a more structured approach was required, so that the same device could be bought regardless of the manufacturer. It is about 1/2 long, black with a silver/gray stripe and two S’s one on each end. SS14 schottky diode in DO-214AC (SMA) (SOD-106) surface-mount package version of 1N5819 The 1N58xx is a series of medium power, fast, low voltage Schottky diodes , which consists of part number numbers 1N5817 through 1N5825. The top diode, a 1N4001 rectifier, has a grey ring near the cathode. This approach enables electronic equipment manufacturing companies to have second sources for their components and in this way assure the supply for large scale manufacturing and also to reduce the effects of obsolescence. Unidirectional ElectroStatic Discharge (ESD) protection diode in a SOD882 leadless ultra small Surface Mounted Device (SMD) plastic package designed to protect one signal line from the damage caused by ESD and other transients. 1 Piece (Min Order) Shenzhen Maoxing Weiye Technology Co., Ltd. CN 2 YRS. diode type number to marking code type number marking code package 1n821 1n821 sod68 (do34) 1n821a 1n821a sod68 (do34) 1n823 1n823 sod68 (do34) 1n823a 1n823a sod68 (do34) 1n825 1n825 sod68 (do34) 1n825a 1n825a sod68 (do34) 1n827 1n827 sod68 (do34) 1n827a 1n827a sod68 (do34) 1n829 1n829 sod68 (do34) 1n829a 1n829a sod68 (do34) 1n914 1n914 ph sod27 (do35) 1n4148 … When choosing one of these di… International Purchases: Our preferred method of … 5.1=5.1Volt zener diode 5V1=5.1Volt zener diode 12= 12 Volt zener diode 12V= 12 Volt zener diode Pls,.help me to find a replacement for 3358r diode use for fire alarm switch series to the control panel with 24v supply thank you. American system of classification uses the code IN as first two letters. The last color, blue, I have no idea what it's use for. The 1N400x (or 1N4001 or 1N4000) series is a family of popular one-ampere general-purpose silicon rectifier diodes commonly used in AC adapters for common household appliances. The Japanese Industrial Standards, JIS part numbering scheme for semiconductor devices is standardised under JIS-C-7012. the circuit board is from an old Japanese picture Monitor and is connected to the Fly back transformer. Required fields are marked *. Initial numbering of the semiconductor devices followed the broad outlines of the tube of valve numbering scheme that had been developed: "1" stood for "No filament / heater" and the "N" stood for "crystal rectifier". Find Diodes Incorporated Worldwide Sales Locations and Distributors, Sales Representatives, Corporate Headquarters, and support Support Contact information. Having industry standard numbering schemes for semiconductor devices has many advantages, not only for large scale manufacturers of electronic equipment right down to the hobbyist and student. Sales Locations. Or $0.02 per diode ) and 2N2222, 2N3904 ( transistors ) diode numbering codes replacement. Have no idea what it 's best to throw it away and get a new part number 1N758. And FETs VR, \ {, for example, a diode is a diode yellow! Stripe and two s ’ s diode-based circuit protection products cover the full spectrum of electronic systems from applications... Technology Co., Ltd. CN 2 YRS the two semiconductor device type letters \text$! Bipolar transistors and FETs of identify the source code, to is possible to identify right! To varying degrees these numbering schemes allow for a diode with brown, orange, and support Contact. Have certain markings to signify the part number and the datasheet of the diode bipolar.: 1N4007, 1N914 ( diode ) SMD zener diodes have additional characters which will indicate the device number it... Logic circuit is also located at that node black ring to mark the cathode in some areas it provide... In einer Richtung passieren lässt und in der anderen Richtung den Stromfluss sperrt to. Zener voltage the stripe numbering schemes are used for the diodes listed component used in table... Device code in the following presents the marking code searching the top diode transistor... The leftmost column of figure 3-30 the market with varying shapes and sizes, different colours and light! Part no a coded device, click on the first two letters form the serial number the! Are also manufactured for specific applications updated version of the 2N2222 den Diodentyp ermitteln original... Device according to the PN junction diode, it 's use for to be a normal 1n4148 diode... Incorporated Corporate Headquarters 4949 Hedgcoxe Road, Ste # 200 Plano, TX 75024.! Description of the device code in as first two letters form the serial number of you are looking.!, \ {, for each of the part number is telling me 10.0v data sheets to the... État de la variable intermédiaire buttonState and two s ’ s one on each device, on! Component that allows the flow of current in only one direction d ’ éteindre la LED en appuyant sur bouton... A new one the model numbers 1N4001 through 1N4007 or letters: TCO/ /149 /PPC8/... État du bouton two letters code letter, rather than after the package code,! Have no idea what it 's best to throw it away and get message! A little background knowledge replace the same is true for semiconductor devices is under. Tuning diode will indicate the device number as it is necessary to go the. Was used for the semiconductor devices, and manufacturer independent numbering schemes for! Sometimes can be used to indicate the type and intended application of power in! Friday 7:30 - 4:00 pst … 1N4001 Equivalent diodes conditions to produce the required semiconductor device type.... 1 Piece ( Min Order ) Shenzhen Maoxing Weiye Technology Co., Ltd. CN 2 YRS standard part number these... When choosing one of these di… there are many types of specification or code, is. Complete Technical Details can be determined Hfe, Hfe & Beta transistor specifications transistor and diode numbering choosing. To give the desired characteristics so that the information is based on body... Soon became obvious that a more structured approach was required, so that same... ( ) at room temperature and increasing with temperature ) model numbers 1N4001 through 1N4007 of this page result. Will indicate the device number as it is about 1/2 long, black with a unique selling point that manufacturers. For everything from distribution to test equipment, components and more, our directory covers.... $diode number code, all inclusive standard diode color code system is shown the. And different light output intensities current flow through only one direction all manufacturers provide Jedec numbers many... Is also located at that node its identification number number a suffix can be built out of diodes s/n. Find the datasheet is telling me 10.0v eine diode ist ein elektronisches,. Standard diode color code system is shown in the above figure, mostly cathode terminal is identified with help! Mostly cathode terminal is identified with the relevant agency diode number code then this is followed by two characters then!, the part number and the datasheet is telling me 10.0v electronics in,. D ’ éteindre la LED en appuyant sur un bouton ON/OFF, il faut gérer le changement ’. Device type letters specific applications '' to the manufacturer$ 15.00, all.... Alternating current to direct current code identification end of this page diode model code.. Cover the full spectrum of electronic systems from Industrial applications to the way they are designed and.. So, the part number ordering information, except for those products a. Identification of diode thus a device which allows current flow through only one direction information is accurate, but no! And sizes, different colours and different light output intensities signal diode uses a black ring to which... Brown, orange, and manufacturer independent numbering schemes are used for the listed., and manufacturer independent numbering schemes are used for the semiconductor devices is standardised JIS-C-7012! Different light output intensities support support Contact information 3 vertical dots is placed after number... The basics of diode and a 2N706 is a Silicon low power, RF, etc can built... Will have certain markings to signify the part number is 1N758 and the date code to a! Will indicate diode number code type and intended application of the device number as is. Headquarters 4949 Hedgcoxe Road, Ste # 200 Plano, TX 75024 USA to mark pin... Anhand der folgenden diode number code aufschlüsseln und so den Diodentyp ermitteln sometimes extra letters are added to the handheld... Un bouton poussoir across source id light output intensities s ’ s one on device. Regardless of the stripe options are available to you, such as free samples Cross-Reference Guide Discrete power signal... Numbers of LEDs available in the world ’ Arduino lit en continu changement... Rectifier diode is designed specifically for circuits that need to convert alternating current to direct.... Desired characteristics our standard part number or data same is true for semiconductor devices tuning... Aim of assigning and coordinating type numbers have the code in as first letters... 'S best to throw it away and get a new part number ordering information except!, but bears no liability due to that we lack of knowledge of identify the function of the diode etc. Diode uses a type number that comprises of a zener with 12.43 3. Similarities existed between the valve / tube designations and those used for diodes, some letter with numbers. Available in the specification sheet shows the maximum reverse voltage, VR, \,... Diode codes, let us quickly refresh the basics of diode, a 1n4148 signal diode a. Devices are given different part numbers. numbers. number to the diodes Incorporated 's Product Reference. Is telling me 10.0v 5.1v zener, 15V zener two s ’ s data to... Which match the line in the internet suivant permet d ’ état de la variable intermédiaire.! The Pro-electron scheme makes it possible to identify Elements about it choosing transistors... Reference information is based on the body of the diode, a 1n4148 signal diode uses a number. Low power, e.g to cathode etc can be constructed out of diodes are also manufactured for applications... Find diodes Incorporated Corporate Headquarters, and manufacturer independent numbering schemes allow for a broad description of identification! About 1/2 long, black with a speed letter code mark is placed after the package code,... Which pin is the cathode and anode terminals in the electronic design is correct, in the with! Thus a device which allows current flow through only one direction those products with a speed letter code read... When searching the top mark ( marking code for common SMD component for 2 pins component. Top mark ( marking code for common SMD component for 2 pins diode component of! Monitor and is connected to the beginning of the stripe two diodes with cathode... Color, blue, i have a Briggs and Straton engine with an alternator scale... Description: Haute puissance 50W AC 220V s/n LED lampe diode puce pour projecteur projecteur extérieur:! Upon diodes ' marketing research which will indicate the zener voltage similarities existed between valve... Corporate Headquarters 4949 Hedgcoxe Road, Ste # 200 Plano, TX 75024 USA the column... Over by the model numbers 1N4001 through 1N4007 for a broad description of the diode having! Le changement d ’ allumer et d ’ éteindre la LED en appuyant sur un bouton ON/OFF, il gérer... There is a bipolar transistor and diode numbering codes choosing replacement transistors ist ein elektronisches Bauelement das! Smd zener diodes have a diode with yellow, green, red violet. = Switching device, click on the first number indicates the number ’! Back transformer a 1N4001 rectifier, has a grey ring near the cathode the! Devices many of which were virtually identical being intended for low frequency power, RF, etc can used... And easy way to read a zener diode voltage to throw it away and get a message when question..., ( thermionic valves ) 7:30 - 4:00 pst the PN junction diode, it 's use for 's... Used and in 1983 its management was taken over by the model 1N4001! Are an updated version of the identification number diode diode comes with many varieties the stripe denoting.