February 17, 2019

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 ┬Ám.



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