<< [[Electronic Components MOC]] #Reference https://www.electronics-notes.com/articles/electronic_components/transistor/transistor-codes-numbering.php ## Pro-Electron/EECA ### First letter - A = Germanium - B = Silicon  - C = Gallium Arsenide  - R = Compound materials  ### Second letter - A = Diode - low power or signal  - B = Diode - variable capacitance  - C = Transistor - audio frequency, low power  - D = Transistor - audio frequency, power  - E = Tunnel diode  - F = Transistor - high frequency, low power  - G = Miscellaneous devices  - H = Diode - sensitive to magnetism  - L = Transistor - high frequency, power  - N = Photocoupler  - P = Light detector  - Q = Light emitter  - R = Switching device, low power, e.g. thyristor, diac, unijunction  - S = Transistor - switching low power  - T = Switching device, low power, e.g. thyristor, triac  - U = Transistor - switching, power  - W = Surface acoustic wave device  - X = Diode multiplier  - Y = Diode rectifying  - Z = Diode - voltage reference ### Suffix - A = low gain - B = medium gain  - C = high gain  - No suffix = gain unclassified ## JEDEC - First Number = - 1 = Diode - 2 = Bipolar transistor or single gate field effect transistor - 3 = Dual gate field effect transistorThe number equates to the number of junctions, although this has to be interpreted a little for MOSFETs. - Second Letter = N  - Subsequent numerals = Serial number ## JIS-C-7012 **First Number** The first number indicates the number of junctions in the semiconductor device. - 1 = Diode - 2 = Bipolar transistor or single gate field effect transistor - 3 = Dual gate field effect transistor **Letters in positions 2 & 3** - SA = PNP high frequency bipolar transistor - SB = PNP audio frequency bipolar transistor - SC = NPN high frequency bipolar transistor - SD = NPN audio frequency bipolar transistor - SE = Diodes - SF = Thyristor (SCR) - SG = Gunn devices - SH = UJT (Unijunction transistor) - SJ = P-channel JFET / MOSFET - SK = N-channel JFET / MOSFET - SM = Triac - SQ = LED - SR = Rectifier - SS = Signal diode - ST = Avalanche diode - SV = Varactor diode / varicop diode - SZ = Zener diode / voltage reference diode **Serial number** The serial number follows the first digit and the two semiconductor device type letters. The numbers run between 10 and 9999. **Suffix** Following the serial number a suffix can be used to indicate the device has been type approved, i.e. there is a guarantee that it has been manufactured under the right conditions to produce the required semiconductor device. ## Manufacturer codes [List of IC manufacturer codes](https://www.ultralibrarian.com/2020/09/15/list-of-ic-manufacturer-codes-ulc) - MJ = Motorola power, metal case - MJE = Motorola power, plastic case - MPS = Motorola low power, plastic case - MRF = Motorola RF transistor - TIP = Texas Instruments power transistor (plastic case) - TIPL = TI planar power transistor - TIS = TI small signal transistor (plastic case) - ZT = Ferranti - ZTX = Ferranti