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. Batteries needed, this number may contain a suffix letter after the last digit. The cathode terminal can be identified by using a grey bar as shown in the picture above. 12= 12 Volt zener diode. Transistor specifications The diode may perform better than this, but it would be unwise to rely on it. 1=5. If
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. With brown being a "1," orange a "3," and white "9," the device would be identified as a type 139 semiconductor diode , or specifically 1N139. TVS and power voltage-regulating diodes DATE CODE Factory designator Month 1 to 9 = January to September A = October B = November C = December Year (e.g., 5 = 2015 6 = 2016) X Y Z M prefix denotes halogen-free compound M ADP MXY Polarity (for PAR TVS only) Type code Date code The same is true for semiconductor devices, and manufacturer independent numbering schemes are used for diodes, bipolar transistors and FETs. There are some useful SMD codebooks available that provide the data for these devices. Many technicians are confused on how to really read a zener diode code. There are many types of code number indicated on it's body. To distinguish it, is by wanting on the codenumber on it is body- whether or not its a regular diode or zener diode. There are many types of code number indicated on it is body. A 1N4734A Zener diode has a 5.6-volt and a 1 W power rating. This system is not only used for diodes but transistors and many other special semiconductor devices as well.">. Each color band represents numbers like the standard significant A diode is a simple electronic component which blocks current in one direction and allows it in the other. A diode is a device which allows current flow through only one direction. Reading Transistor Markings Most transistor markings follow one of these codes: JEDEC, JIS or Pro-Electron. To indicate modified versions of the year, while the last 3 represent the of. 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