Microchip confusion

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Microchip confusion

Can anyone help me out here?

I pulled out two corroded SN74LS161 AN chips from an Apple II+.  eBay doesn't have any of these up for sale right now, but they DO have SN74LS161 N and DN74LS161 AN chips for sale (from China) - is the D vs S significant here?  What about the AN vs N in the chip name?  

I also need to replace a corroded DM74LS02 N chip.  

What is significant about these chip names / branding that I need to match, and what isn't?

Any help is appreciated!

S1

 

tokabln's picture
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Are the old once really

Are the old once really defect or only corroded... in case of they are only corroded... you can use a  simple Fiberglass Scratch Brush to clean their pins... that's all then.

 

for example: https://www.amazon.com/SE-7616SB-Fiberglass-Scratch-Brush/dp/B003NHDITW

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Statsman1 wrote: is the D vs

Statsman1 wrote:

 is the D vs S significant here?

No. It's just important to get 74LS where 74LS were before.

Regards

Ralf

 

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See https://en.wikipedia.org
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Thanks, guys!

Thanks, guys!

 

I have to replace about 6 ROM chips, and a bunch of the others...there's corrosion and blue rot around the pins.  Additionally, the legs on 2 or 3 of them broke off during removal from the board.  I don't think I'm going to try to clean them at this point, I'll just get new ones.

 

Thank you for the education, though...I appreciate learning about this stuff.

 

S1

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