March 1, 2020
February 28, 2020

BF862 - low-noise N-Channel JFET : real vs fake : weekend die-shot

Designed for AM radio preamps, but found much wider use in low-noise amplifiers.
Genuine part first, from reliable EU supplier. SMD marking 2AW 6o. Die size 358x358 µm. Die crack is on me.

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February 22, 2020

Guangdong Hottech BC848C - Genuine Chinese BJT : weekend die-shot

Guangdong Hottech BC848C - general purpose BJT, made in China, and sold as a genuine Chinese product by Layout is typical, metalization lithography is somewhat rough, not sure if it affects performance.

Die size 284x284 µm.

February 19, 2020

K544UD1A - Russian JFET opamp : weekend die-shot

Manufactured in 2016, similar to µA740C. Die size 1853x1552 µm.

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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.

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