Digital Step Attenuators: RFSA2644 / 2654

RFSA2644RFMD’s new RFSA2644/2654 6-bit digital step attenuators (DSAs) feature high linearity over their entire 31.5 dB gain control range with excellent step accuracy in 0.5 dB steps. They are programmed via a serial mode control interface that is both 3 and 5 V compatible.

They also offer a rugged Class 1C HBM ESD rating via on-chip ESD circuitry. The MCM package is footprint-compatible with most 24-pin, 4 mm x 4 mm, QFN packages.


  • Frequency Range
    • RFSA2644: 50 MHz to 4000 MHz
    • RFSA2654: 5 MHz to 2000 MHz
  • Attenuation Range and Step: 31.5 dB , 0.5 dB
  • Step Accuracy: +/-(0.1 dB + 5% attenuation range)
  • IIP3 >50 dBm For All Steps
  • 3 V and 5 V Logic-Compatible
  • Serial Programming Interface
  • Power-Up Programming Modes


  • Transceiver RF and IF Applications
  • 2 G, 3 G, LTE, WiMax/WiFi
  • Wireless Data, Satellite Terminals
  • Test Equipment
  • CATV/Satellite Set Top Boxes
  • Cable Modems
  • CATV Infrastructure
  • Data Network Equipment

Both the RFSA2644 and RFSA2654 are currently available in production quantities. Pricing begins at $1.76 each for 750 pieces.

See more from us in our Buyers Guide directory listing.

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