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Author Topic: What are these? ("9430" "BO829" so-8 package)  (Read 1202 times)

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Offline awallinTopic starter

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What are these? ("9430" "BO829" so-8 package)
« on: February 09, 2016, 08:41:13 am »
There are four of these SO-8 chips (in parallel?) at the power-input of an old board. Looks like they are after an LM311N that maybe compares external DC-voltage to an on-board battery-voltage and selects between the two sources. So these would be FETs that switch between the power-sources?

As can be seen from the image, one was not very happy about a reverse-polarity incident...

"9430" at the top. "W829" at the bottom. Not 100% sure what it says in the middle. Googling didn't show anything at least quickly...


thanks!
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Offline amyk

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Re: What are these? ("9430" "BO829" so-8 package)
« Reply #1 on: February 09, 2016, 08:47:37 am »
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Offline awallinTopic starter

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Re: What are these? ("9430" "BO829" so-8 package)
« Reply #2 on: February 09, 2016, 01:12:51 pm »
Quote from: amyk on February 09, 2016, 08:47:37 am
Si9430DY

thanks that was quick! do you just keep all the parts numbers in your head or is there a method/search-engine I should know about?

Farnell suggests IRF7406PBF as a replacement.
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Offline djQUAN

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Re: What are these? ("9430" "BO829" so-8 package)
« Reply #3 on: February 09, 2016, 01:24:05 pm »
The pin connections were a clue. That is a standard SO8 mosfet pinout. :)
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