Spotting a fake audio op-amp in a chip die shot #Electronics #ReverseEngineering @Zeptobars
Via the Zeptobars blog comes some mystery and surprise in their weekly chip die photograph:
This was a weird one. After de-capping Analog Devices OP275 from audio opamp assortment kit I was surprised to see familiar Ti NE5532 die. As it was quite unusual, I de-capped original Ti NE5532 (directly from their e-shop) to confirm that older photo was indeed from genuine part, as well as one more fake OP275 to confirm that there was no mistake.
It looks like someone remarked Ti NE5532 as Analog Devices OP275. Die attach and properties of plastic package also suggest Ti origin of this part.
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2nd sourcing happens quite a bit in the 80’s with TT & LSTTL for example. Ferranti fabbed and packaged parts as a 2nd source for other semi companies. Happened for discrete devices too (common transistors, diodes, fets).
It’s not surprising if it’s still happening.
P.S. The resistor slider to comment is a pain in mobile where the sliders and screen slip around
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