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Old 19th May 2009, 10:35 AM   #1
jkeny is offline jkeny  Ireland
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Default BC556C or BC546C for swap

I bought from Mouser 100 each of these high HFE transistors with the intention of getting matched pairs out of them. I got them in ammo form so each type is from the same batch.

On testing, using a DMM with hfe, I find that all the 546Cs are in the 500 range & all the 556Cs are in the 400 range. I need closer matching than this.

I have a small no of these from another source & they are the opposite (BC546Cs 460-480, BC556Cs 500-520).

Anybody got any complementaries that would match for swapping?
BC546C range 500-520
BC556C range 430-460
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Old 19th May 2009, 11:20 AM   #2
jkeny is offline jkeny  Ireland
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All mine are tested and marked, BTW
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Old 19th May 2009, 12:12 PM   #3
h_a is offline h_a  Europe
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May I ask you why you need hfe-matched complementary pairs?

I am not aware of anybody or any design that would require or even recommend this - so I'm curious!

Have fun, Hannes
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Old 19th May 2009, 12:30 PM   #4
jkeny is offline jkeny  Ireland
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Aha, yes, what a dummy I am - I only need to match within the types - I got so caught up in measuring & forgot about to look at the schematic - Doh!
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Old 19th May 2009, 03:06 PM   #5
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PNP's are not as good as NPN's so a qualified guess is that you probably won't find any pair NPN/PNP pairs.
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