LR433A - Chinese 433MHz SAW resonator : weekend die-shot

This Chinese LR433A is a SAW resonator at 433MHz. Heart of numerous simplest RF transmission systems. Die is transparent - it's quartz.

It was packaged this dirty (it looks more like photoresist processing defect). Die size 3681x769 µm.


Comb pitch 3.2µm (line+space). Another specimen had cute defect: only miracle left 2 terminals not shorted: