A3000 IC3 chip

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mattdy4
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A3000 IC3 chip

Post by mattdy4 » Mon May 28, 2018 7:23 pm

Doing a repair on an A3000 and I need to replace IC3 which is a Fairchild Semi DM7438N. Not because this chip was hit by battery acid but I accidentally chopped it while I was desoldering the affected ROM sockets and IC4/IC5 (maybe it's the lead [-o< )

Anyway in the process of buying a new one and socketing it. There is a second number on the chip which doesn't turn up anything which seems quite common for this chip. Can I replace DM7438n with any part bearing that number or will that just not work?

TIA

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danielj
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Re: A3000 IC3 chip

Post by danielj » Mon May 28, 2018 7:27 pm

Second number will be a date code - this should do the job: https://www.ebay.co.uk/itm/401472004402

mattdy4
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Re: A3000 IC3 chip

Post by mattdy4 » Mon May 28, 2018 7:30 pm

Thanks Daniel, I read it was a date code but wasn't sure if it made a difference to it's function. Does it go off? :lol:

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danielj
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Re: A3000 IC3 chip

Post by danielj » Mon May 28, 2018 8:08 pm

No, it just tells you when it was made :D - some batches get a reputation for being rubbish :)! Some ICs are quite collectable and early date codes are worth more. Clearly these don't fall into that category!
:)

d.

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