BETASupply2.15–5.5 V
SHT31-DIS digital humidity and temperature sensor
SHT31 Specifications
Review SHT31 electrical specifications, operating conditions and package details.
Key specifications
Write a 16-bit measurement command, wait for completion or use clock stretching, then read temperature and humidity with separate CRC checks.
Typical humidity error±2 %RH · see tolerance curves
Typical temperature error±0.2 °C · 0–90°C
I²C addresses44 / 45 hex · seven-bit
Package details
SHT31-DIS-B · DFN-8 + EP
| Property | Details |
|---|---|
| Manufacturer | Sensirion |
| Part number | SHT31-DIS-B |
| Package | DFN-8 + EP |
| Connections | 9 pins |
| Mounting | SMD |
| Lead pitch | 0.50 mm |
| Package code | DFN-8 |
| Thermal reference | −40°C to +125°C · reference conditions apply |
Power and operating conditions
Digital SHT31-DIS variant
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply | 2.15–5.5 V | 3.3 V in the example |
| Local bypass | 100 nF | Place close to VDD and VSS |
| Idle / conversion current | 0.2 µA / 600 µA typical | Single-shot idle at 25°C; conversion 1.5 mA maximum |
| Specified ranges | −40°C to +125°C; 0–100%RH | Extended range; normal conditions are narrower |
| Recommended normal operation | 5–60°C and 20–80%RH | Long exposure outside this region can change sensor behavior |
| Bus pullups | 4.7 kΩ in the example | An illustrative short 100 kHz bus; calculate for the real load |
No specifications match. Try a parameter name or a unit.
Do not confuse operating limits with absolute maximum ratings.
Accuracy and response
SHT31 grade; do not substitute SHT35 limits
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Humidity tolerance | ±2%RH typical | Use the manufacturer curves for range-dependent maxima |
| Temperature tolerance | ±0.2°C typical over 0–90°C | See the temperature error curve outside this range |
| Humidity repeatability | 0.08%RH typical, high setting | A noise metric, distinct from absolute accuracy |
| Temperature repeatability | 0.04°C typical, high setting | A noise metric, distinct from absolute accuracy |
| Humidity response | 8 s typical to 63% | 25°C, 1 m/s airflow, without ART |
| Temperature response | Greater than 2 s | Depends strongly on mounting and heat exchange |
No specifications match. Try a parameter name or a unit.
A 16-bit result is not a promise of 16-bit measurement accuracy.
Useful command reference
Two-byte command values
Manufacturer specifications 8 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Single shot, high repeatability | 0x2400 / 0x2C06 | Without / with clock stretching |
| Single shot, medium repeatability | 0x240B / 0x2C0D | Without / with clock stretching |
| Single shot, low repeatability | 0x2416 / 0x2C10 | Without / with clock stretching |
| Periodic, 1 sample/s, high | 0x2130 | Fetch with 0xE000 |
| Exit periodic mode | 0x3093 | Break command |
| Soft reset | 0x30A2 | Allow the reset recovery time |
| Read / clear status | 0xF32D / 0x3041 | Status is a checked 16-bit word |
| Heater enable / disable | 0x306D / 0x3066 | Heater raises sensor temperature; not normal ambient measurement |
No specifications match. Try a parameter name or a unit.
Use explicit error handling for NACKs and communication timeouts.
Six-byte response and equations
Temperature first, humidity second
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Bytes 0–2 | Temperature MSB, LSB, CRC | Unsigned raw word ST |
| Bytes 3–5 | Humidity MSB, LSB, CRC | Unsigned raw word SRH |
| Temperature | T = −45 + 175 × ST / 65535 | Result in °C |
| Relative humidity | RH = 100 × SRH / 65535 | Result in %RH |
| CRC-8 | Polynomial 0x31; initial 0xFF | No reflection; final XOR 0; reset for each word |
| Reference check | CRC(BE EF) = 92 hex | Manufacturer test vector |
| Illustrative response | 66 66 93 80 00 A2 hex | 25.00°C and approximately 50.00%RH |
No specifications match. Try a parameter name or a unit.
Check all six bytes before updating the displayed measurements.
Conversion and interface timing
Supply-dependent maximum conversion time
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| High repeatability | 15 ms at 2.4–5.5 V | 15.5 ms at 2.15 V to below 2.4 V |
| Medium repeatability | 6 ms at 2.4–5.5 V | 6.5 ms at 2.15 V to below 2.4 V |
| Low repeatability | 4 ms at 2.4–5.5 V | 4.5 ms at 2.15 V to below 2.4 V |
| Power-up | 1 ms maximum at 2.4–5.5 V | 1.5 ms in the lower supply range |
| Soft reset | 1.5 ms maximum | Wait before another command |
| Supported I²C clock | Up to 1 MHz | Respect the electrical and rise-time limits |
| Periodic rates | 0.5, 1, 2, 4 or 10 samples/s | Do not mistake sample rate for environmental response time |
No specifications match. Try a parameter name or a unit.
Choose command mode, bus speed and power budget together.
Pin straps and package
Top-view numbering; underside pad identified separately
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| ADDR | VSS → 0x44; VDD → 0x45 | Never leave floating |
| R contact 7 | Connect to VSS | Not a spare GPIO |
| ALERT | Leave open if unused | Optional alarm output |
| nRESET | Leave open if unused | Optional pullup must be at least 2 kΩ |
| Center pad | Internally connected to VSS | Soldering supports the package mechanically |
| DFN outline | 2.5 × 2.5 × 0.9 mm nominal | Eight 0.5 mm-pitch perimeter contacts |
| Authored land pattern | 0.55 × 0.25 mm signal lands | 1.0 × 1.7 mm rectangular center land; review mask and paste |
No specifications match. Try a parameter name or a unit.
Keep the sensing opening free of coating, flux residue and enclosure obstructions.
Connections by function
Select a pin for its function, connection guidance and electrical notes.