Skip to main content

Radxa Heatsink 5540A

Product Overview​

The Radxa Heatsink 5540A is a passive heatsink designed for Radxa CM3 and CM5.

Version Notes

The Radxa Heatsink 5540A has two versions: the older version is silver, and the newer version is black.

Specifications​

  • Material: Aluminum alloy
  • Dimensions: 55 x 40 x 10 mm
  • Compatible with:
    • Radxa CM3
    • Radxa CM5

Installation Guide​

This section uses Radxa CM3 as an example to demonstrate how to install the 5540A heatsink.

Package Contents​

  • 1x Heatsink
  • 1x Thermal pad
  • 4x CM2 x 4 mm screws

Install the Antenna (Optional)​

If you are using an external antenna, install it on the CM3 before installing the heatsink.

Apply the Thermal Pad​

Place the thermal pad on the SoC of the CM3.

Secure the Heatsink​

Use 4 CM2 x 4 mm screws to fasten the heatsink from the bottom side through the CM3 mounting holes.

Mount the Assembly to the CM3 IO Board​

Install the CM3 with the heatsink attached onto the CM3 IO board.

    You need to be logged into GitHub to post a comment. If you are already logged in, please ignore this message.

    Radxa-docs © 2026 by Radxa Computer (Shenzhen) Co.,Ltd. is licensed under CC BY 4.0