Target: Environment relative humidity,temperature
Model: WHT20
Detection principle: MEMS capacitive humidity sensor
Characteristics: 1、High accuracy ±3.0% RH and ±0.5℃;2、Wide power supply voltage range, from 2.0V to 5.5V;3、SMD package suitable for reflow soldering;4、Quick response and strong anti-interference ability;5、Excellent long-term stability under high humidity condition
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WHT20 is embedded in a dual-row flat no-lead SMD package, which is suitable for reflow soldering, with 3.0x3.0mm bottom surface and 1.0mm height. The temperature and humidity signals can be read on different pins. The sensor outputs calibrated digital signals in standard IIC format.
WHT 20 is equipped with an ASIC chip, a MEMS capacitive humidity sensor and a temperature sensor. WHT 20 temperature and humidity sensors have been calibrated and tested on factory, and have excellent reliability and long-term stability.


  • Home appliance fields: home appliance, humidity control, HVAC, dehumidifiers, smart thermostats, and room monitors etc ;
  • Automotive fields: in-vehicle air quality, cabin humidity and temperature
  • Industrial fields: automobiles, testing equipment, and automatic control devices;
  • Other fields: data loggers, weather stations, medical and other related temperature and humidity detection devices.


  • High accuracy ±3.0% RH and ±0.5℃
  • Wide power supply voltage range, from 2.0V to 5.5V
  • SMD package suitable for reflow soldering
  • Quick response and strong anti-interference ability
  • Excellent long-term stability under high humidity condition


Parameter Condition Min Typical Max Unit
Resolution Typical   0.01   %RH
Accuracy error1 Typical   ±3.0   %RH
Max See figure2   %RH
Repeatability     ±0.1   %RH
Hysteresis     ±1.0   %RH
Non-linear     <0.1   %RH
Response time2 t63%   <8   s
Scope of work extended3 0   100 %RH
Prolonged Drift4 Normal   <0.5   %RH/yr

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with UL, CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.