www.sensirion.com / D1

Version 7.1 – March 2025

18 / 24

To ensure full functionality of the sensor and avoid damaging its integrated filter membrane, when mounting

the sensor, follow the reflow soldering process as described in the Handling Instructions [2]. Furthermore, the

therein described care regarding board wash and cleaning still apply.

6.2 Protective Cover

The SHT4x will be available with a second protective option, a removable protective cover to protect the

sensing element during sensor installation. The sensor will be delivered with the protective cover attached

such that the sensor opening is completely covered and sealed. This enables cost-effective brush-over and

spray-over application procedures of conformal coating material. Such coating is often required in highly

corrosive environments to protect solder joints. In this process the protective cover prevents the sensor

opening from being sealed by any coating. Afterwards the protective foil can safely be pulled off with

tweezers at the designated non-sticking flap which contains the anti-adhesion layer.

The protective cover is made of polyimide making it highly resistant to chemicals and elevated temperatures.

To ensure full functionality of the cover, when mounting the sensor, follow the reflow soldering process as

described in the Handling Instruction [3].

Figure 20. Sketch of the SHT4x with attached polyimide foil.

7

Quality and Material Contents

Qualification of SHT4x is performed based on the JEDEC JESD47 qualification test method, qualification

report available on request. The device is fully RoHS and WEEE compliant, e.g. free of Pb, Cd, and Hg.

For general remarks of best practice in processing humidity sensor please refer to the handling instructions

[2].