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AM26C32: AM26C32IDR

Part Number: AM26C32

Tool/software:

Hello,

I have 4 reels of AM26C32IDR, 2 works in my product and the others 2 does not work. The only difference is the wafer and the country. 

Works Mexico and SHE

 Does not work Malaysia and RHB.

Electrically, what is it the different between both? 

Thank you.