About this part

HTS221TR – Digital Humidity & Temperature Sensor – STMicroelectronics

Engineered for precision environmental monitoring, the STMicroelectronics HTS221TR digital sensor delivers reliable humidity and temperature measurements in compact designs. This integrated circuit combines high accuracy with ultra-low power consumption, ideal for space-constrained IoT and portable devices requiring robust environmental sensing capabilities.

Key Features

• Dual Sensing: Measures both humidity (0–100% RH) and temperature
• ±4.5% RH Accuracy across full humidity range
• Ultra-Low Voltage: Operates at 1.7V–3.6V
• High-Speed Interface: I²C/SPI digital output with 16-bit resolution
• Rugged Design: -40°C to 120°C operating temperature
• Surface-Mount Package: 6-HLGA (2×2) for PCB integration

Technical Specifications

This MEMS-based humidity/temperature sensor features a 10-second response time with calibrated digital output. The capacitive sensing element provides linearized humidity measurements while the embedded thermal sensor delivers temperature compensation. Housed in a compact 6-VLGA package, it supports industrial-grade environmental resilience with surface-mount assembly. Note: This part has been marked obsolete by STMicroelectronics but remains available through PCX for existing designs and replacement needs.

Typical Applications

• Smart home climate control systems
• Portable medical diagnostic equipment
• HVAC monitoring and automation
• Industrial process control devices
• Weather station instrumentation

About STMicroelectronics

STMicroelectronics is a global semiconductor leader with 40+ years of sensor innovation. Their MEMS technology portfolio sets industry standards for precision and reliability across automotive, industrial, and consumer markets. ST’s sensors undergo rigorous qualification processes, ensuring consistent performance in critical applications.

The company maintains one of the electronics industry’s most comprehensive quality certifications, including AEC-Q100 for automotive-grade components. STMicroelectronics’ vertically integrated manufacturing and continuous R&D investment guarantee cutting-edge sensing solutions trusted by Fortune 500 manufacturers worldwide.

About Humidity/Temperature Sensors

Integrated humidity and temperature sensors are essential for environmental monitoring across modern electronics. These ICs combine sensing elements with signal conditioning circuitry to provide calibrated digital outputs, eliminating complex calibration routines. Their compact form factors enable deployment in space-limited designs where ambient conditions directly impact system performance.

Advanced MEMS-based sensors like the HTS221TR deliver critical data for climate control, predictive maintenance, and user comfort optimization. When selecting environmental sensors, key considerations include measurement accuracy, power efficiency, response time, and industrial temperature range compliance – all critical for reliable operation in demanding applications.

Packaging Options

Available in industry-standard Tape & Reel (TR) for automated assembly or Cut Tape (CT) for prototyping needs. Specify preferred packaging at checkout.

Frequently Asked Questions

Question: Is the HTS221TR suitable for battery-powered devices?
Answer: Yes, its 1.7–3.6V operating range and low power consumption make it ideal for battery-operated applications.

Question: What’s the difference between RH% accuracy and resolution?
Answer: Accuracy (±4.5% RH) indicates measurement deviation from true values, while the 16-bit output provides high-resolution data reporting.

Question: Can I use this sensor in outdoor environments?
Answer: With its -40°C to 120°C operating range and full humidity coverage, it’s designed for harsh conditions when properly enclosed.

Question: Why is this part marked obsolete?
Answer: STMicroelectronics has discontinued production, but PCX maintains stock for design continuity and replacement needs.

Question: Do you provide technical documentation?
Answer: Yes, download the HTS221TR datasheet for complete specifications.

Question: How does temperature sensing affect humidity readings?
Answer: The integrated temperature sensor provides automatic compensation, ensuring humidity accuracy across thermal variations.

⚠️ Final Stock Available! Secure your HTS221TR sensors now before inventory depletion. PCX guarantees authentic STMicroelectronics components with same-day shipping and dedicated technical support.

Need immediate design assistance? Call PCX support at (800) 555-0100 or message our engineers.

Product images are representational only. Refer to datasheet for exact dimensions.