Si4738/39 AM/FM/WB Radio Receivers

The Silicon Labs family of Si4738/39 ICs are the industry's first fully integrated, 100% CMOS AM/FM/WB and FM/WB radio receivers.   Our Si4738/39 AM/FM/WB radio receivers provide the space savings and low power consumption necessary for portable devices while delivering the high performance and design simplicity desired for all AM/FM/WB solutions.  

Leveraging our proven and patented digital low intermediate frequency (low-IF) receiver architecture, the Si4738/39 delivers superior RF performance and interference rejection in both AM and FM bands. The high integration and complete system production test simplify design-in, increase system quality, and improve manufacturability. 

Offering unmatched integration and PCB space savings, the Si4736/37/38/39 ICs require only two external components and less than 15 mm2 of board area, excluding the antenna inputs.



  • Weather band support (162.4–162.55 MHz)
  • Worldwide FM band support (76–108 MHz)
  • 1050 Hz tone detection
  • AM/FM/WB digital tuning
  • No manual alignment necessary
  • Dynamic channel filters
  • Advanced AM/FM seek tuning

Si4738/39 Product Matrix

Part Number Data Sheet Description Tuning Method Display Method Mono/Stereo RDS FM AM SW LW WB TX EN55020
FM/Weather Band Receiver Digital Digital Stereo No Yes No No No Yes No No
FM/Weather Band Receiver w RDS Digital Digital Stereo Yes Yes No No No Yes No No
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