3x3 mm DFN Package Sensor SILICON LABS SI7021-A20-IM1 for Accurate Humidity and Temperature Detection
Product Overview
The Si7021-A20 is a monolithic CMOS IC that integrates humidity and temperature sensor elements, an analog-to-digital converter, signal processing, and calibration data with an I2C interface. It features patented low-K polymeric dielectrics for humidity sensing, ensuring low power consumption, minimal drift and hysteresis, and excellent long-term stability. The sensor is factory-calibrated and fully interchangeable. Available in a 3x3 mm DFN package, it serves as a drop-in upgrade for existing RH/temperature sensors, offering enhanced precision and lower power. An optional factory-installed cover provides protection against liquids and particulates. This device is ideal for measuring humidity, dew-point, and temperature in a wide range of applications.
Product Attributes
- Brand: Silicon Laboratories
- Model: Si7021-A20
- Material: Monolithic CMOS IC with low-K polymeric dielectrics
- Package: 3x3 mm DFN
- Certifications: Patent Protected
Technical Specifications
| Parameter | Symbol | Test Condition | Min | Typ | Max | Unit |
| Relative Humidity Sensor Accuracy | 080% RH | 3 | % RH | |||
| High Accuracy Temperature Sensor | 10 to 85 C | 0.4 | C | |||
| Operating Range (RH) | 0 | 100 | % RH | |||
| Operating Range (Temperature) | 40 | +125 | C | |||
| Operating Voltage | VDD | 1.9 | 3.6 | V | ||
| Low Power Consumption | Active Current | RH conversion | 150 | 180 | A | |
| Standby Current | 0.06 | 0.62 | A | |||
| I2C Interface Speed | fSCL | 400 | kHz | |||
| Conversion Time (12-bit RH) | tCONV | 10 | 12 | ms | ||
| Conversion Time (14-bit Temperature) | tCONV | 7 | 10.8 | ms | ||
| Powerup Time | tPU | From VDD 1.9 V to ready for a conversion, 25 C | 18 | 25 | ms |
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