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Old 13th June 2009, 08:54 PM   #1
Bitrex is offline Bitrex  United States
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Default Monlithic transistor IC for input stage design?

I'm wondering if anyone can recommend a decent inexpensive monolithic transistor IC (i.e. multiple matched transistors on the same die) for input stage design? I'd like to use such an IC for experimenting with differential gain stages, temperature compensation, and matched transistors for current sources, that sort of thing. Any advice would be appreciated!
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Old 13th June 2009, 09:25 PM   #2
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I could not fine any, that's why recently bought 5,000 of 2SC1815
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Old 13th June 2009, 09:30 PM   #3
pdul is offline pdul  Denmark
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What about the old famous LM394?
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Old 13th June 2009, 09:47 PM   #4
Mr Evil is offline Mr Evil  United Kingdom
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There was a recent thread about matching transistors that had some recommendations for monolithic dual/quad transistors for input stages. Additionally, if you want some specifically for current mirrors, then I like BCV61/BCV62 because they are internally connected as current mirrors already, so they only have four pins.
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Old 13th June 2009, 11:50 PM   #5
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MAT02/03/04?
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Old 15th June 2009, 03:42 PM   #6
mlloyd1 is offline mlloyd1  United States
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i've used mpqxxxx series parts from sprague (also from motorola) years ago. neither still supplies these.

however, it appears central semiconductor still has them:
http://www.centralsemi.com/PDFs/products/LSSGP079.PDF

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Old 15th June 2009, 03:47 PM   #7
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I'm pretty sure these parts are not matched.
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Old 15th June 2009, 04:16 PM   #8
Mr Evil is offline Mr Evil  United Kingdom
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Quote:
Originally posted by sawreyrw
I'm pretty sure these parts are not matched.
No, but look at the measurements I made of a MMPQ6700 in the thread I linked to above. They reflect what I've found with all the monolithic arrays I have tried before - even unmatched ones tend to be very close.
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Old 15th June 2009, 04:29 PM   #9
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Hum, that is pretty impressive. All of the individual devices must have come from the same die. I don't suppose this is guaranteed, but it makes sense that this would normally be the case. A cheap way to get matched devices for no premium.
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Old 15th June 2009, 04:33 PM   #10
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