September 7, 2020

Motorola MWA120 - hybrid 0.4GHz RF amplifier : weekend die-shot

Ceramic substrate size 4265x4255 µm. Transistor die size 383x324 µm.

Thermal damage visible around resistor trim lines. Back in the days it could have even been CW laser, not ps/fs luxury we have now.

Update: Closer look at brutal trim line (~15µm wide) - molten metal splashed everywhere.
Resistors are thin-film Tantalum, rest of conductors is Gold. Ceramic substrate is alumina.