Sensirion SHT21, Temperature & Humidity Sensor -40 to +125 °C ±0.3 °C, ±2%RH Serial-I2C, 6-Pin DFN
- RS Stock No.:
- 7865554
- Mfr. Prt No.:
- SHT21
- Brand:
- Sensirion
Technical Reference
Legislation and Compliance
RoHS Certificate of Compliance
EU Directives 2011/65/EU and 2015/863 restrict the use of the 10 substances below in the manufacture of specified types of electrical equipment.
Whilst this restriction does not legally apply to components, it is recognised that component “compliance” is relevant to many customers.
RS definition of RoHS Compliance:
- The product does not contain any of the restricted substances in concentrations and applications banned by the Directive,
- and for components, the product is capable of being worked on at the higher temperatures required by lead–free soldering
The restricted substances and maximum allowed concentrations in the homogenous material are, by weight:
| Substance | Concentration |
| Lead | 0.1% |
| Mercury | 0.1% |
| PBB (Polybrominated Biphenyls) | 0.1% |
| PBDE ( Polybrominated Diphenyl Ethers) | 0.1% |
| Hexavalent Chromium | 0.1% |
| Cadmium | 0.01% |
| DEHP (Bis (2-Ethylhexl) phthalate) | 0.1% |
| BBP (Benzyl butyl phthalate) | 0.1% |
| DBP (Dibutyl phthalate) | 0.1% |
| DIBP (Diisobutyl phthalate) | 0.1% |
The supplier of the item listed below has informed RS Components that the product is "RoHS Compliant".
RS Components has taken all reasonable steps to confirm this statement. Information relates only to products sold on or after the date of this certificate.
| RS stock number | 7865554 |
| Product description | Sensirion SHT21, Temperature & Humidity Sensor -40 to +125 °C ±0.3 °C, ±2%RH Serial-I2C, 6-Pin DFN |
| Manufacturer / Brand | Sensirion |
| Manufacturer part number | SHT21 |
RS Components Ltd, Birchington Road, Corby, Northants, NN17 9RS, UK
Statement of Conformity
This statement confirms that the product detailed below complies with the specifications currently published in the RS media and has been subject to the strict quality conditions imposed by RS Components’ internal management systems. Furthermore and where applicable, it confirms that all relevant semiconductor devices have been handled and packed under conditions that meet the administrative and technical requirements of ANSI/ESD S20.20 and EN61340-5-1 electrostatics control standards.
| RS stock number | 7865554 |
| Product description | Sensirion SHT21, Temperature & Humidity Sensor -40 to +125 °C ±0.3 °C, ±2%RH Serial-I2C, 6-Pin DFN |
| Manufacturer / Brand | Sensirion |
| Manufacturer part number | SHT21 |
The foregoing information relates to product sold on, or after, the date shown below.
RS COMPONENTS
| Date | Apr 28, 2024 |
RS Components Pte Ltd Robinson Road, P.O. Box 1582, Singapore 903132
Product Details
Temperature & Humidity Sensors, Sensirion
SHT2x Digital Humidity & Temperature Sensors
The Sensirion SHT2x series of DFN digital humidity & temperature sensors are CMOSens® based. They are an industry standard, widely used humidity and temperature sensor. Humidity is measured using a capacitive sensor while temperature is measured using a band-gap sensor.
The SHT2x sensors also contain a version 4 silicon chip with an amplifier, A/D converter, OTP memory and a digital interface. They come in a plastic package which leaves the sensor area open, protecting the devices from external impact and providing long-term stability.
SHT2x sensors are ideal for both high and low volume applications.
The SHT21P has a PWM output and the SHT21S has a PDM output; these can be converted into analogue outputs by the use of suitable low-pass filters.
SHT20 - Low cost, SHT21 - Standard, SHT25 - High Accuracy
CMOSens® based technology
Fully calibrated
I²C serial interface (Not SHT21P/SHT21S)
Digital output
Low power consumption
Long-term stability
Supply voltage range: 2.1 to 3.6 V
The following sensors are available:
123-7351 · SHT20 · I²C Digital output
786-5554 · SHT21 · I²C Digital output
876-5055 · SHT21P · PWM output
876-5064 · SHT21S · PDM output
727-6226 · SHT25 · I²C Digital output
Specifications
| Attribute | Value |
| Brand | Sensirion |
| Sensor Function | Temperature & Humidity |
| Output Type | Digital |
| Interface Type | Serial-I2C |
| Accuracy | ±0.3 °C, ±2 %RH |
| Mounting Type | Surface Mount |
| Pin Count | 6 |
| Operating Temperature Range | -40 to +125 °C |
| Minimum Operating Temperature | -40 °C |
| Maximum Operating Temperature | +125 °C |
| Minimum Operating Supply Voltage | 2.1 V |
| Maximum Operating Supply Voltage | 3.6 V |
| Package Type | DFN |
| Length | 3 mm |
| Height | 1.1 mm |
| Width | 3 mm |
| Dimensions | 3 x 3 x 1.1 mm |
| Resolution | 8 → 14 bit |
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