This integrated thermal conductivity gas sensor measures hydrogen in air and provides a calibrated digital output over an I²C interface. It operates from a 3.3 V supply, supports hydrogen measurement from 0 to 16 vol%, and achieves response and recovery times below 100 ms. The device compensates temperature, humidity, and pressure effects when external humidity and pressure information is provided. It is specified for -40 °C to 105 °C ambient operation, uses the PG-DSOSP-14-84 package, and is qualified for automotive applications to AEC-Q100 grade 2. The sensor is designed for automotive fuel cell hydrogen leakage detection, battery monitoring systems, and industrial hydrogen leakage measurement, with a stated 15-year operating lifetime.
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| Sensing principle | Thermal conductivity |
| Hydrogen measurement range | 0 to 4vol% |
| Extended hydrogen measurement range | 4 to 16vol% |
| Response/recovery time (t90, t10) | 100 maxms |
| Measurement accuracy | ±0.12 up tovol% H2 |
| Digital resolution | 0.01vol% H2/LSB |
| RMS noise level | 0.015 typvol% H2 |
| Supply voltage | 3.3 ±5%V |
| Interface | I2C, 1 Mbit/s |
| I2C slave address | 0x36 |
| Operating ambient temperature | -40 to 105°C |
| Analysis gas pressure | 50 to 130kPa |
| Relative humidity | 0 to 100, non-condensing%RH |
| Stand-by current | 2.3 typµA |
| Sensor peak current | 5 typmA |
| Temperature sensor measurement range | -40 to 125°C |
| Temperature sensor total error | ±5°C |
| Operating lifetime | 15years |
