2.4 GHz High-Power 802.11ax WLAN Front-End Module

The SKY85331-11 is a highly integrated, 2.4 GHz front-end module (FEM) incorporating a 2.4 GHz single-pole, double-throw (SPDT) transmit/receive (T/R) switch, a 2.4 GHz low-noise amplifier (LNA) with bypass, and a 2.4 GHz power amplifier (PA) intended for high-power 802.11ax applications and systems.

The LNA and PA disable functions ensure low leakage current in the off mode. An integrated logarithmic power detector is included to provide closed-loop power control over 20 dB of dynamic range.

The device is provided in a compact 24-pin 3 x 5 mm conformally shielded Land Grid Array (LGA) package, which may reduce the front-end board space by more than 50 percent.


Product LifecycleIn Production
Frequency (GHz) Min.2.4
Frequency (GHz) Max.2.5
802.11 WLAN Standardax
Antenna Ports1
ArchitectureWLAN Front-End Module
Typ. POUT @ 3.0% EVM (dBm)26
Typ. Current @ VCC = 5 V (mA)470
Typ. Tx Gain (dB)33
VDD (V)5
PackageQFN, 24-pin
Package (mm)3 x 5 x 0.85


  • Integrated high-performance 2.4 GHz PA, LNA with bypass, and T/R switch
  • Fully matched input and output
  • Integrated logarithmic power detector
  • Transmit gain: 33 dB
  • Supports 802.11ax: output power:
    • +20 dBm, -43 dB DEVM, MCS11
    • +22 dBm, -40 dB DEVM, MCS11
    • +24 dBm, -35 dB DEVM, MCS9
  • Integrated, temperature-compensated log detector
  • High LNA gain: 15 dB
  • Small (24-pin, 3 x 5 mm) conformally shielded package (MSL3, 260 °C per JEDEC J-STD-020)

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