Sensirion SHT21P Humidity & Temperature Sensor, ±2%RH Accuracy, PWM Output

Name: Sensirion SHT21P Humidity &amp; Temperature Sensor, ±2%RH Accuracy, PWM Output
Brand: Sensirion
SKU: SENS-1012
Price: 939.00 INR
Availability: OutOfStock

₹939.00 (Inclusive of all taxes)

Out of Stock

The Sensirion SHT21P is a high-precision digital humidity and temperature sensor in a compact DFN package, delivering calibrated PWM output signals ideal for integration into industrial monitoring systems, HVAC controls, and portable consumer devices.

Features

High accuracy sensing with ±2% RH humidity and ±0.3°C temperature precision.
Compact 3×3 mm DFN package with reflow solderable footprint for space-constrained designs.
Digital PWM output at 120 Hz, switching between humidity and temperature data on the SDA line.
Low power consumption of ~180 µA at 3.0V, optimized for battery-powered applications.
Integrated CMOSens® technology ensures excellent long-term stability and reliability.

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Description

The Sensirion SHT21P integrates a capacitive polymer humidity sensor and a band-gap temperature sensor on a single CMOSens® chip. This monolithic integration provides fully calibrated, linearized digital output via a 120 Hz PWM signal, eliminating the need for external signal conditioning. The sensor switches between humidity and temperature readings using the SDA and SCL control lines.

Designed for demanding environments, the SHT21P offers fast response times (humidity ~8s, temperature 5–30s) and operates within a 10 to 40°C range. Its robust construction and factory calibration ensure stable performance over extended periods, making it suitable for precision measurement applications where reliability is critical.

Key Features

High-Accuracy Sensing: Delivers ±2% relative humidity and ±0.3°C temperature accuracy for reliable environmental monitoring.
Ultra-Compact DFN Package: 3 x 3 mm footprint with 1.1 mm profile enables integration into miniaturized electronic assemblies.
Digital PWM Interface: Provides a 120 Hz digital output signal, simplifying microcontroller integration with direct digital readout.
Optimized Low-Power Operation: Consumes only 180 µA typical current at 3.0V, extending battery life in portable devices.
Advanced CMOSens® Technology: Combines sensor element, signal processing, and calibration data on a single chip for superior stability.
Industrial-Grade Reliability: Factory calibrated, RoHS/WEEE compliant, and designed for long-term operation in varied conditions.
Fast Response Characteristics: Achieves a humidity response time of approximately 8 seconds for dynamic environment tracking.

Applications

Precision HVAC and building automation systems for climate control.
Industrial process monitoring and data logging in controlled environments.
Portable weather stations and consumer environmental monitoring devices.
Medical equipment requiring stable humidity and temperature tracking.
Asset and condition monitoring in logistics and storage facilities.

Technical Specifications

Manufacturer Part Number	SHT21P
Sensor Type	Humidity & Temperature
Humidity Accuracy	±2% RH
Temperature Accuracy	±0.3°C
Supply Voltage	3.0 to 3.6 V
Operating Current	180 µA (typical)
Output Interface	120 Hz PWM (Digital)
Control Interface	SDA/SCL lines for measurement switching
Package Type	3x3 mm DFN
Operating Temperature	10 to 40 °C
Humidity Response Time	~8 s
Temperature Response Time	5–30 s
Compliance	RoHS, WEEE

Frequently Asked Questions

What is the output signal type of the SHT21P sensor?

The SHT21P provides a digital output via a 120 Hz Pulse Width Modulation (PWM) signal. The duty cycle of this PWM signal corresponds to the measured humidity or temperature value. The sensor switches between outputting humidity and temperature data based on the state of the SDA and SCL control lines.

What is the recommended supply voltage range for the SHT21P?

The SHT21P requires a supply voltage between 3.0V and 3.6V DC. Operating outside this range may affect measurement accuracy and could potentially damage the sensor. Typical current consumption is approximately 180 µA when powered at 3.0V.

How do I switch between reading humidity and temperature with this sensor?

Switching between humidity and temperature measurements is controlled digitally via the SDA and SCL lines, as per the sensor's communication protocol. You must pull the SDA line low to select temperature output or high to select humidity output, following the timing specifications in the official Sensirion datasheet.

Is the SHT21P sensor calibrated, and what is its long-term stability?

Yes, each SHT21P sensor is individually factory calibrated, and the calibration data is stored digitally on the chip. The integrated CMOSens® technology ensures excellent long-term stability, minimizing drift over time. For critical applications, periodic verification is recommended according to your quality control procedures.

Can the SHT21P be used in outdoor or harsh environments?

The SHT21P is designed for indoor or controlled environments, with an operating temperature range of 10 to 40°C. Its DFN package is not inherently sealed against moisture or dust. For outdoor or harsh industrial applications, proper protective housing and environmental sealing (conformal coating, IP-rated enclosure) are required to ensure reliable operation.