5.9 GHz C-V2X and 802.11p DSRC High-Power Front-End Module

The SKY5A2105 is a highly integrated, 5.9 GHz front-end module (FEM) incorporating a 5.9 GHz single-pole, quad throw (SP4T) switch, low-noise amplifier (LNA), power amplifier (PA), a band-pass BAW filter (BPF), and a digital step attenuator (DSA) for C-V2X LTE and 5G NR applications and systems.

A BAW bypass state and high gain state in RX and TX mode extends dynamic range in compensator mode. LNA and PA functions are disabled in off mode to insure low leakage current.

An integrated logarithmic power detector is included to provide closed-loop power control over more than 25 dB dynamic range.

In addition, the front-end module offers a temperature sensor function to allow system implementation of reliability or safety algorithms.

A MODE control pin supports either compensator or ECU mode:

In compensator mode, a digital SPI interface controls the DSA from 0 dB to 31.75 dB in 0.25 dB steps.

In ECU mode, a GPIO interface controls the DSA from 0 dB to 31.75 dB in 5 dB steps.

GPIO control pins enable fast switching in both compensator mode and ECU mode.

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


Product LifecycleSamples Only
Frequency (GHz) Min.5.855
Frequency (GHz) Max.5.925
Architecture5.9 GHz C-V2X and 802.11p DSRC High-Power Front-End Module
PackageLGA, 24-pin
Package (mm)3 x 5


  • AEC-Q104 Grade 2 (–40 °C to +105 °C)
  • Supports dual Compensator and ECU mode
  • High output power across temperature range:
    • C-V2X (LTE): +29 dBm typical
    • C-V2X (5G NR): +26.5 dBm typical (2.5 dB MPR)
    • 802.11p DSRC: +26 dBm typical
  • Integrated BAW Rx filter
  • Integrated temperature sensor
  • Integrated logarithmic detector with wide dynamic range
  • High resolution digital attenuator for wide TX/RX gain range compensation
  • Automotive-friendly package
    • 24-pin, 3 x 5 mm LGA package
    • MSL3, 260 °C, per JEDEC J-STD-020

Product Documents


DSRC and V2X

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