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ISM-band RF transmitter IC (no RX capability). Bare bones with minimal modulation etc support.

Package

8-pin DFN.

Markings: 

  NR3
  XF
  138

Die

Size is approximately FIXME x FIXME μm (FIXME mm2)

Mask rev markings (focus stack of several images). Looks like 6 metal layers total.

Random logic showing classic UMC 180nm CMP fill pattern