Sensirion STS21 Temperature Sensor ±0.2°C, Digital I2C Output

Name: Sensirion STS21 Temperature Sensor ±0.2°C, Digital I2C Output
Brand: Sensirion
SKU: SENS-3494
Price: 219.00 INR
Availability: OutOfStock

₹219.00 (Inclusive of all taxes)

Out of Stock

The Sensirion STS21 is a high-precision digital temperature sensor with ±0.2°C accuracy, delivering calibrated and linearized data via an I2C interface. Its compact DFN package and 2.1–3.6V supply make it ideal for integration into portable devices, industrial monitoring systems, and embedded platforms like Arduino, Raspberry Pi, and ESP32.

Features

High Accuracy: ±0.2°C typical accuracy over a wide -40°C to +125°C operating range.
Digital I2C Interface: Simple two-wire communication with selectable addresses (0x4A/0x4B) and CRC data protection.
Ultra-Compact Design: 3×3 mm DFN package for space-constrained PCB layouts.
Low Power Operation: Consumes as low as 0.2 µA in idle mode and 600 µA during active measurement.
Fully Calibrated: Factory-calibrated CMOSens® technology ensures linearized digital output and long-term stability.

Out of stock

Get Notified When Available

Description

The Sensirion STS21 is a digital temperature sensor built on Sensirion’s proprietary CMOSens® technology, which integrates the sensing element, signal conditioning, analog-to-digital conversion, and digital processing on a single chip. This monolithic design provides exceptional measurement stability and reliability, with a typical accuracy of ±0.2°C and excellent repeatability of 0.12°C.

It communicates via a standard I2C interface, offering configurable resolution from 11 to 14 bits and supporting an ALERT function for programmable temperature thresholds. The sensor operates from a 2.1V to 3.6V supply, making it suitable for battery-powered applications. Its robust performance across the full -40°C to +125°C range makes it a reliable choice for demanding environmental monitoring, HVAC control, and industrial process applications.

Key Features

High-Precision Sensing: Delivers typical accuracy of ±0.2°C (0–65°C) with a resolution as fine as 0.01°C.
CMOSens® Technology: Integrated chip design provides calibrated, linearized digital output and superior long-term stability.
Flexible I2C Communication: Features two selectable slave addresses (0x4A, 0x4B) and includes CRC checksum for data integrity.
Optimized Power Management: Offers three repeatability modes for balancing performance and power consumption, with idle current as low as 0.2 µA.
Robust Environmental Rating: Operates reliably across an extended temperature range from -40°C to +125°C.
Compact Footprint: Housed in a miniature 3x3 mm DFN package, ideal for high-density PCB designs.
Programmable Alert Function: Integrated ALERT pin can be configured to signal when user-defined temperature thresholds are exceeded.

Applications

High-accuracy environmental monitoring and data logging systems.
HVAC (Heating, Ventilation, and Air Conditioning) control and diagnostics.
Portable medical devices and wearable health monitors requiring precise thermal measurement.
Industrial process control and equipment temperature monitoring.
Thermal management in consumer electronics, servers, and telecommunications equipment.

Technical Specifications

Manufacturer Part Number	STS21
Sensor Type	Digital Temperature Sensor
Operating Temperature Range	-40°C to +125°C
Typical Accuracy (0–65°C)	±0.2°C
Repeatability	0.12°C
Resolution	Configurable, 0.01°C to 0.04°C
Supply Voltage	2.1 V to 3.6 V DC
Communication Interface	I2C (Addresses: 0x4A, 0x4B)
Average Current Consumption	330 µA
Idle Current	0.2 µA (typical)
Package Type	DFN (Dual Flat No-Lead)
Package Dimensions (L x W)	3.0 mm x 3.0 mm
Weight	0.005 kg

Frequently Asked Questions

What is the operating voltage range for the STS21 sensor?

The Sensirion STS21 operates from a supply voltage of 2.1V to 3.6V DC. This range makes it compatible with common 3.3V logic systems found in microcontrollers like ESP32, STM32, and Raspberry Pi, and suitable for battery-powered applications.

How do I communicate with the STS21 sensor and what are its I2C addresses?

Communication is via the standard I2C (I²C) two-wire interface. The sensor has two selectable slave addresses: 0x4A (default) and 0x4B. The data transmission includes a CRC checksum for enhanced communication reliability.

What is the typical accuracy and measurement range of the STS21?

The STS21 offers a typical accuracy of ±0.2°C within the 0°C to 65°C range. It can measure temperatures across a full operating range of -40°C to +125°C, maintaining high repeatability of 0.12°C.

Is the STS21 sensor calibrated, and what is its power consumption?

Yes, the sensor is fully factory-calibrated using Sensirion's CMOSens® technology, providing linearized digital output. It features very low power consumption, with an average working current of 330 µA and an idle current as low as 0.2 µA, ideal for power-sensitive designs.