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Lo Vce Equivalent replacement for ULN2003

whizbang · 2018-03-12 01:38:23

A 5v application, uses one of these 2003 open collector drivers for a bunch of relays. But the 2003 has a Vce Sat of >0.85V in this application, which is too high to reliably drive the relays. Ideally need a pin-pin compatible 7channel lo side driver/switch with low Rds/Vsat Have looked at TPL7407 - 5v is too low. TBD62003…

12-03-2018 2:38am

#1

whizbang

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A 5v application, uses one of these 2003 open collector drivers for a bunch of relays.

But the 2003 has a Vce Sat of >0.85V in this application, which is too high to reliably drive the relays.

Ideally need a pin-pin compatible 7channel lo side driver/switch with low Rds/Vsat

Have looked at TPL7407 - 5v is too low. TBD62003 has similar Vds to 2003..

Any suggestions thanks ?

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#2 12-03-2018 1:23pm

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Ask here.
Chances of a suitable answer are a few orders of magnitude higher.

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#3 13-03-2018 2:14am

whizbang

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Thanks, will do.

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#4 14-03-2018 8:19pm

DublinDilbert

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The problem is these are based on a darlington transistor, which can't be saturated. Ideally if you can find a mosfet equivalent, that should do the job for you.

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