2SA/2SC and 2SB/2SD designations - definition of high and low frequency limits

[japlytic]

Some of you would know that a 2SA (PNP)/2SC (NPN) designation is a high frequency transistor, and that a 2SB (PNP)/2SD (NPN) designation is a low frequency transistor.

Is there any offical definition for an upper frequency limit for 2SB/2SD transistors and a minimum frequency definition for 2SA/2SC devices? The definitions seem to be open to interpretation .

[shovenose]

Re: 2SA/2SC and 2SB/2SD designations - definition of high and low frequency limits

I have no clue what your twlking sbout
But someone else with the right answer please poat cuz i wanna figurenout wtf japlytic is tslking about

[Th3_uN1Qu3]

Re: 2SA/2SC and 2SB/2SD designations - definition of high and low frequency limits

I never bothered with this kinda questions, just read the datasheet, chose an appropriate replacement, and all was fine. But hey, maybe somebody does have an answer.

[Cartel]

Re: 2SA/2SC and 2SB/2SD designations - definition of high and low frequency limits

I was wondering this myself

The second letter in transistor’s marking describes its primary use:
C – low and medium power LF transistor,
D – high power LF transistor,
F – low power HF transistor,
G – other transistors,
L – high power HF transistors,
P – photo transistor,
S – switch transistor,
U – high voltage transistor.


Japanese bipolar transistor are prefixed with a: 2SA, 2SB, 2SC or 2SD
2SA – PNP, HF transistors,
2SB – PNP, LF transistors,
2SC – NPN, HF transistors,
2SD – NPN, LF transistors.

http://learn.mikroe.com/ebooks/compo...o-transistors/


A= p-n-p, radio frequency applications
B = p-n-p, audio frequency
C = n-p-n, RF
D = n-p-n, AF