January 8, 2015

Noname MMBT3904 - npn BJT transistor : weekend die-shot

On the first glance it looks very similar to NXP PMST3904, but topology is clearly redrawn. Notice sketchy borders of metalization - apparently they were using lift-off process for metalization instead of plasma etching. But for discrete transistors this might still be acceptable for good yield.

Die size 290x291 ┬Ám, which is slightly larger than NXP's one.