I2C T/RH sensor, addr 0x44, ±0.2 °C / ±1.8 %RH, DFN-4 1.5×1.5mm
temperature humidity i2c sensirion low-power
| field |
value |
| id |
sensors/sensirion/sht41 |
| kind |
sensor |
| vendor |
sensirion |
| MPN |
SHT41-AD1B |
| revision |
1.0.0 |
| lifecycle |
stable |
Constraints
I²C
| field |
value |
| address |
0x44 |
| address pin options |
0x44, 0x45 |
| pull-ups |
10000 Ω required |
Accuracy
| metric |
value |
| rh_pct |
±1.8 |
| temp_c |
±0.2 |
Power
| field |
value |
| min startup time |
1.0 ms |
| requires decoupling |
100nF X7R close to VDD |
Interrupt
Operating temperature
-40.0 °C to 125.0 °C
Response time
4.0 ms
Interface
| field |
value |
| type |
i2c |
| max speed |
1000 kHz |
Electrical
| field |
value |
| VCC |
3.3 V nominal; 1.08–3.6 V range |
| Current draw |
0.4 mA active; 0.08 µA sleep |
| Logic |
cmos_3v3; 3.3 V; NOT 5V tolerant |
Package
| field |
value |
| type |
DFN-4 |
| pin count |
4 |
| IPC name |
DFN40P150X150X50-4N |
| dimensions |
1.5 mm×1.5 mm×0.5 mm |
Drivers
KiCad refs
| field |
value |
| symbol |
hw-registry:SHT41 |
| footprint |
hw-registry:Sensirion_DFN-4-1EP_1.5x1.5mm |
Datasheet
Tested
| field |
value |
| status |
production-tested |
| by |
rnd@southerniot.net |
| date |
2026-01-08 |
Evidence: Field-deployed in LoRaWAN T/RH nodes since 2025-Q4.
Description
Sensirion fourth-generation digital humidity and temperature sensor. Two-wire I²C interface. ±0.2 °C accuracy on temperature and ±1.8 %RH on relative humidity over the calibrated range. Single-supply 1.08–3.6 V, sub-µA sleep current, integrated heater, NIST-traceable factory calibration. SHT41-AD1B variant has the address strap pulled to 0x44.