Si4820/24/25/31/35/36 Mechanically-Tuned AM/FM Radio Receivers

The Si4820/24/25/31/35/36 is a mechanically-tuned digital display CMOS AM/FM/SW radio receiver IC that integrates the complete receiver function from antenna input to audio output. Similar to other superior audio products from Silicon Labs, the Si482x/3x family offers unmatched integration and PCB space savings with minimum external components and a small board area.  

The Si482x/3x requires a simple application circuit and removes any requirements for manually tuning components during the manufacturing process. The Si4820/24/25 are drop in compatible with the Si4831/35/36, making the IC a simple product to design, manufacture, and support across multiple product lines. Powered by two AAA batteries, the receiver has ultra-low power consumption and delivers the performance benefits of digital tuning to the AM/FM/SW analog radio market.  

For consumer applications that require EN55020 compliance, use the Si4831/35/36 family.



  • Worldwide FM band support (64–109 MHz)
  • Worldwide AM band support (504–1750 kHz)
  • SW band support (5.6–22 MHz) (Si4824/25/35/36 only)
  • Direct volume control
  • On-chip bass and treble tone control
  • Supports station and stereo LED indicators
  • Flexible band selections
  • Excellent real-world performance
  • Automatic frequency control (AFC)
  • Integrated LDO regulator
  • 24-pin Pb-free SSOP
  • EN55020-compliant
  • Small single-sided PCB
  • No manual alignment required
  • No external MCU required
  • Runs off 2 AAA batteries with 2.0~3.6 V supply voltage
  • Wide range of ferrite loop sticks and air loop antennas supported
  • Advanced linear frequency display

Si4820/24/25/31/35/36 Product Matrix

Part Number Data Sheet Description Tuning Method Display Method Mono/Stereo RDS FM AM SW LW WB TX EN55020
FM/AM w Mechanical Tuning No No No No No No No No
FM/AM/SW w Mechanical Tuning No No No No No No No No
FM/AM/SW-Wide band w Mech Tuning No No No No No No No No
FM/AM w Mechanical Tuning/Stereo Mechanical Analog Stereo No Yes Yes No No No No Yes
FM/AM/SW w Mechanical Tuning/Stereo Mechanical Analog Stereo No Yes Yes Yes No No No Yes
FM/AM/SW-Wide band w Mech Tuning/Stereo No No No No No No No No
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