Most transistor markings follow one of these codes: JEDEC, JIS or Pro-Electron. For ICs, look for known
numbers (e.g. 741, 4001, 7400) between the prefix and the suffix. Don't confuse it with the date code. ICs typically have two numbers: The part number and the date code. 1. 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. But 4N and 5N are reserved for opto-couplers. The sequential numbers run from 100 to 9999 and indicate the approximate time the device was first made.
If present, a suffix could indicate various things. For example, a 2N2222A is an enhanced version of a 2N2222. It has higher gain, frequency, and voltage ratings. Always check the data sheet.
Examples: 1N914 (diode), 2N2222, 2N2222A, 2N904 (transistors).
NOTE: When a metal-can version of a JEDEC transistor is remade in a plastic package, it is often given a number such as PN2222A which is a 2N2222A in a plastic case.
2. 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. The letters indicate the type and intended application of the device according to the following code:
SA: PNP HF transistor
SC: NPN HF transistor
SE: Diodes
SG: Gunn devices
SJ: P-channel FET
SM: Triac
SR: Rectifier
ST: Avalanche diodes
SZ: Zener diodes
SB: PNP AF transistor
SD: NPN AF transistor
SF: Thyristors
SH: UJT
SK: N-channel FET
SQ: LED
SS: Signal diodes
SV: Varicaps
The sequential numbers run from 10-9999. The optional suffix indicates that the type is approved for use by various Japanese organizations. Since the code for transistors always begins with 2S, it is sometimes omitted; for example, a 2SC733 could be marked C733.
Examples: 2SA1187, 2SB646, 2SC733.
3. Pro-Electron (European)
These part numbers take the form: two letters, [letter], sequential number, [suffix]
The first letter indicates the material:
A = Ge
B = Si
C = GaAs
R = compound materials.
The second letter indicates the device type and intended application:
A: diode, RF
B: diode,varactor
C: transistor, AF, small signal
D: transistor, AF, power
E: Tunnel diode
F: transistor, HF, small signal
K: Hall effect device
L: Transistor, HF, power
N: Opto-coupler
P: Radiation sensitive device
Q: Radiation producing device
R: Thyristor, Low power
T: Thyristor, Power
U: Transistor, power, switching
Y: Rectifier
Z: Zener, or voltage regulator diode
The third letter indicates if the device is intended for industrial or commercial applications. It's usually a W, X, Y, or Z. The sequential numbers run from 100-9999.
Examples: BC108A, BAW68, BF239, BFY51.
Instead of 2N and so forth, some manufacturers use their own system of designations. Some common prefixes are:
MJ: Motorola power, metal case
MJE: Motorola power, plastic case
MPS: Motorola low power, plastic case
MRF: Motorola HF, VHF and microwave transistor
RCA: RCA device
TIP: Texas Instruments (TI) power transistor, plastic case
TIPL: TI planar power transistor
TIS: TI small signal transistor (plastic case)
ZT: Ferranti
ZTX: Ferranti
Examples: ZTX302, TIP31A, MJE3055.
Many manufacturers also make custom parts, or custom-label standard parts, for large volume OEM customers. Typically, they have the OEM's mark or logo and part-number. When such parts hit the surplus market, they end up in hobbyist "bargain packs". Since data on these devices is not usually available, they are best used as LED-drivers and other such applications where the actual specifications are not critical.
numbers (e.g. 741, 4001, 7400) between the prefix and the suffix. Don't confuse it with the date code. ICs typically have two numbers: The part number and the date code. 1. 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. But 4N and 5N are reserved for opto-couplers. The sequential numbers run from 100 to 9999 and indicate the approximate time the device was first made.
If present, a suffix could indicate various things. For example, a 2N2222A is an enhanced version of a 2N2222. It has higher gain, frequency, and voltage ratings. Always check the data sheet.
Examples: 1N914 (diode), 2N2222, 2N2222A, 2N904 (transistors).
NOTE: When a metal-can version of a JEDEC transistor is remade in a plastic package, it is often given a number such as PN2222A which is a 2N2222A in a plastic case.
2. 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. The letters indicate the type and intended application of the device according to the following code:
SA: PNP HF transistor
SC: NPN HF transistor
SE: Diodes
SG: Gunn devices
SJ: P-channel FET
SM: Triac
SR: Rectifier
ST: Avalanche diodes
SZ: Zener diodes
SB: PNP AF transistor
SD: NPN AF transistor
SF: Thyristors
SH: UJT
SK: N-channel FET
SQ: LED
SS: Signal diodes
SV: Varicaps
The sequential numbers run from 10-9999. The optional suffix indicates that the type is approved for use by various Japanese organizations. Since the code for transistors always begins with 2S, it is sometimes omitted; for example, a 2SC733 could be marked C733.
Examples: 2SA1187, 2SB646, 2SC733.
3. Pro-Electron (European)
These part numbers take the form: two letters, [letter], sequential number, [suffix]
The first letter indicates the material:
A = Ge
B = Si
C = GaAs
R = compound materials.
The second letter indicates the device type and intended application:
A: diode, RF
B: diode,varactor
C: transistor, AF, small signal
D: transistor, AF, power
E: Tunnel diode
F: transistor, HF, small signal
K: Hall effect device
L: Transistor, HF, power
N: Opto-coupler
P: Radiation sensitive device
Q: Radiation producing device
R: Thyristor, Low power
T: Thyristor, Power
U: Transistor, power, switching
Y: Rectifier
Z: Zener, or voltage regulator diode
The third letter indicates if the device is intended for industrial or commercial applications. It's usually a W, X, Y, or Z. The sequential numbers run from 100-9999.
Examples: BC108A, BAW68, BF239, BFY51.
Instead of 2N and so forth, some manufacturers use their own system of designations. Some common prefixes are:
MJ: Motorola power, metal case
MJE: Motorola power, plastic case
MPS: Motorola low power, plastic case
MRF: Motorola HF, VHF and microwave transistor
RCA: RCA device
TIP: Texas Instruments (TI) power transistor, plastic case
TIPL: TI planar power transistor
TIS: TI small signal transistor (plastic case)
ZT: Ferranti
ZTX: Ferranti
Examples: ZTX302, TIP31A, MJE3055.
Many manufacturers also make custom parts, or custom-label standard parts, for large volume OEM customers. Typically, they have the OEM's mark or logo and part-number. When such parts hit the surplus market, they end up in hobbyist "bargain packs". Since data on these devices is not usually available, they are best used as LED-drivers and other such applications where the actual specifications are not critical.
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