SKU: SENS-3511
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Sensirion SHT21 Humidity & Temperature Sensor, 0 to 100%RH, −40 °C to +125 °C, I2C Interface

₹279.00 (Inclusive of all taxes)
Out of Stock

The Sensirion SHT21 is a fully calibrated digital humidity and temperature sensor with an I2C interface, designed for integration into embedded systems, data loggers, and environmental monitoring platforms requiring high accuracy and stability.

Features

  • Integrated digital humidity and temperature sensor with ±1.8% RH accuracy.
  • I2C digital interface for direct connection to microcontrollers (Arduino, Raspberry Pi, ESP32).
  • Wide operating range: 0 to 100% RH and −40 °C to +125 °C.
  • Low power consumption suitable for battery-powered and portable devices.
  • DFN package is reflow solderable for high-volume, automated PCB assembly.

Out of stock

Description

The SHT21 from Sensirion is a high-precision, factory-calibrated digital sensor that combines relative humidity and temperature sensing in a single, compact DFN package. It utilizes a capacitive polymer sensing element for humidity and a band-gap sensor for temperature, delivering excellent long-term stability and fast response times.

Designed for seamless integration, its digital I2C output eliminates the need for signal conditioning, providing a calibrated, linearized digital signal directly to the host microcontroller. The robust construction ensures reliable performance across a broad spectrum of environmental monitoring, HVAC, and industrial process control applications.

Key Features

  • High Accuracy Humidity Sensing: Delivers ±1.8% RH typical accuracy over a 0-100% RH range.
  • Integrated Temperature Sensor: Provides precise temperature data for compensation and standalone measurement.
  • Fully Digital I2C Output: Simplifies design with a two-wire interface and onboard ADC.
  • Excellent Long-Term Stability: Advanced sensor design minimizes drift for consistent readings over time.
  • Low Power Consumption: Optimized for energy-sensitive applications and battery-operated systems.
  • Reflow-Solderable DFN Package: Enables standard SMT assembly processes for volume manufacturing.

Applications

  • HVAC system climate control and indoor air quality monitoring.
  • Weather stations and portable environmental data loggers.
  • Industrial process monitoring and control systems.
  • Asset tracking and condition monitoring in logistics.
  • Smart home and building automation sensors.

Technical Specifications

Manufacturer Part NumberSHT21
BrandSensirion
Sensor TypeHumidity & Temperature
Humidity Range0 to 100 %RH
Humidity Accuracy±1.8 %RH (typical)
Temperature Range−40 °C to +125 °C
InterfaceI2C (Digital)
Supply Voltage1.08 V to 3.6 V (Typical 3.3V)
Number of Pins4 (DFN package)
Package TypeDFN (Dual Flat No-lead)
CalibrationFully factory calibrated

Frequently Asked Questions

What is the operating voltage range for the SHT21 sensor?

The SHT21 operates from 1.08V to 3.6V, with a typical supply voltage of 3.3V. It is compatible with both 3.3V and 5V microcontroller systems, though a level shifter may be required for the I2C lines when interfacing with 5V logic.

How do I connect and communicate with the SHT21 using I2C?

Connect the SHT21's VDD to 3.3V, GND to ground, SDA to the microcontroller's I2C data line, and SCL to the I2C clock line. The sensor has a default I2C address (0x40). Use standard I2C read/write protocols to request humidity or temperature measurements.

Is the SHT21 sensor calibrated, and does it require periodic recalibration?

Yes, the SHT21 is fully factory calibrated, and the calibration data is stored digitally on the chip. It is designed for excellent long-term stability and typically does not require user recalibration under normal operating conditions.

What is the response time and measurement resolution of the SHT21?

The sensor provides 12-bit relative humidity resolution (0.04% RH/LSB) and 14-bit temperature resolution (0.01°C/LSB). Measurement response time is typically 8 seconds for humidity (tau 63%) and 5 seconds for temperature in still air.

Package Includes

  • 1 x Sensirion SHT21 Humidity & Temperature Sensor Module

Additional Information

Weight 0.02 kg