Fake audio opamp - Ti NE5532 remarked as AD OP275 : weekend die-shot

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.

ST TSU104IPT - nanopower rail-to-rail opamp : weekend die-shot

ST TSU104IPT - is an extremely low power (580nA per channel) CMOS rail-to-rail quad opamp which could work from 1.5V source.
Gain bandwidth is only 8 kHz though. Die size 1123x1219 µm.

ONSemi NLSV1T34 - 1-Bit level translator : weekend die-shot

Die size 774x370 µm.

Rohm DTC143EK - NPN BJT with integrated resistors : weekend die-shot

Die size 723x725 µm.

Ti TL051CDRA - trimmed JFET 20V/µs opamp : weekend die-shot

Extremely similar to BB OPA134PA.
Die size 1587x1070 µm.

Nexperia BFS20 - 450MHz fT npn BJT : weekend die-shot

Die size 290x290 µm.

Fake CD40106B CMOS Hex Schmitt-Triggers Inverters : weekend die-shot

This is Chinese Hex-Schmitt Trigger Inverter chip, marked as if it was made by Texas Instruments, sourced from eBay. Interesting part is that it apparently reuses most masks from CD4049 (hex inverter) we've decapped earlier : transistors needed for Schmitt-input were also present at CD4049, but not connected by different top metal. Somebody did saved few thousands $ here.

Die size 714x849 µm.



Update: Now with metal stripped. it's a metal-gate CMOS, so no gates survived:
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