We love microchips

- That's why we boil them in acid.

February 3, 2020

BF862 - low-noise N-Channel JFET (counterfeit?) : weekend die-shot

Designed for AM radio preamps, but found much wider use in low-noise amplifiers. SOT-23 marking 2Ap 48.
Identified by Jeroen Ponte as probably counterfeit - which is especially likely as NXP stopped production of the original part.
Die size 426x399 µm.

January 31, 2020

140UD9 - general purpose Soviet opamp (1989) : weekend die-shot

Like some of the K140UD2B this one has polymer overcoat, which causes interference pattern across the area due to thickness non-uniformity. 140UD9 is similar to CA3047 with differences in the final amplification stage.
Die size 1780x1780 µm.

January 1, 2020

1977 Unisonic Blackjack - Rockwell A4821 PMOS uC : weekend die-shot

You can read about reverse engineering of this chip here (+following parts) and here, some information about the game is here.

Read more →
December 9, 2019

Infineon BFP540FESD - 30Ghz fT NPN BJT : weekend die-shot

Not often we see multiple metal layers in BJT's. Die size 246x223 µm.

December 7, 2019

TI LMV321 - general purpose 5V opamp: weekend die-shot

Significantly smaller than ST TS321, but low-voltage only. New designs though should use LMV321A.
Die size 635x567 µm.

December 1, 2019