Sensirion AG SHT30-ARP-B
Full Technical Specifications
11 Parameters| Parameter / Attribute | Specification / Value |
|---|---|
| Series | SHT3 |
| Output type | Analog Voltage |
| Sensor type | Humidity, Temperature |
| Mounting | Surface Mount |
| Supply voltage | 2.4V ~ 5.5V |
| Response time | 8 s |
| Operating temperature | -40°C~125°C |
| Humidity range | 0 ~ 100% RH |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Accuracy | ±2% RH |
| Case | 8-VFDFN Exposed Pad |
Need Stock or a Drop-in Second-Source for SHT30-ARP-B?
Package: DFN-8 (SHT3x) / DFN-4 (SHT4x) · Pin-compatible replacements with immediate Shenzhen spot stock
The Sensirion SHT family is the reference humidity sensor of HVAC, medical devices, weather stations and every environmental logger: four generations of the same promise - a factory-calibrated digital RH/temperature pair on I2C - with the accuracy ladder running from the SHT21 baseline to the SHT45 top grade. Across the generations nothing physical carried over: the SHT3x lives in a 2.5mm DFN-8 with an address pin and a 5V-tolerant supply, while the SHT4x generation shrank to a 1.5mm DFN-4, dropped the supply ceiling to 3.6V, fixed the address at order time and removed clock stretching. The market demand spike on the 4x generation made this page necessary: substitutions happen constantly and every one of them crosses at least one of those lines.
Verified Pin-Compatible Replacements (3 verified alternatives)
The Precision Grade in the Same Socket
Shenzhen Spot Stock (24-48h Dispatch)
The high-accuracy member of the SHT3x generation: about +/-0.1C and +/-1.5% RH against the SHT31s +/-0.2C and +/-2% - identical command set, address pin and package.
Same 2.15V to 5.5V window - the 5V-friendly generation.
The Top Grade - Across a Generation Gap
Shenzhen Spot Stock (24-48h Dispatch)
The current accuracy leader: about +/-0.1C and +/-1% RH, best-in-family repeatability, in the smaller 4th-generation die.
1.08V to 3.6V - NOT 5V tolerant, against the SHT3x 5.5V ceiling. On a legacy 5V board the substitution needs the supply arranged deliberately.
The Legacy Baseline
Shenzhen Spot Stock (24-48h Dispatch)
The second-generation original: about +/-0.3C and +/-2% RH, the sensor a decade of loggers were calibrated around.
2.1V to 3.6V - the 3.3V-era part.
Buyer & Quality Checklist for Sourcing Alternatives
- Three generations, three footprints: SHT21 (DFN-6), SHT3x (DFN-8, 2.5mm), SHT4x (DFN-4, 1.5mm). No substitution crosses generations without a layout change - the intra-SHT3x row is the only true same-socket ladder.
- Voltage boundaries: SHT3x runs to 5.5V, SHT4x stops at 3.6V, SHT21 at 3.6V. A 5V design considering a 4x part needs deliberate supply work, not a BOM line.
- Protocol generations differ: SHT4x removed clock stretching and periodic mode and fixed the I2C address at order time (AD1B/BD1B), where SHT3x offers two addresses via the ADDR pin. Firmware written for one generation hits all three differences on the other.
- The accuracy ladder for selection: SHT21 +/-0.3C/2%RH; SHT31 +/-0.2C/2%RH; SHT35 +/-0.1C/1.5%RH; SHT45 +/-0.1C/1%RH. Cost and calibration requirements decide the rung - firmware does not care.
- The classic board error applies across every grade: the sensor next to a regulator or a display backlight reads several degrees high. In field accuracy complaints, check the thermal path before re-calibrating or replacing.
- The 4x generation demand spike drew reels through every channel - buy documented lots with date codes, and screen markings; humidity sensors are calibration data as much as silicon.
Frequently Asked Technical Questions
Q: Is SHT45 a drop-in replacement for SHT31?
A: No - different generation: DFN-4 against DFN-8 (half the footprint), 3.6V supply ceiling against 5.5V, no clock stretching or periodic mode, address fixed at order time. It is the better sensor for new layouts; SHT31/35 remain the same-socket family.
Q: Can I replace SHT21 with SHT31?
A: It is the mainstream generational upgrade, but both the footprint (DFN-6 to DFN-8) and the driver change. Firmware libraries support both; the board does not. Plan it as a redesign, not a repair substitution.
Q: Which SHT grade should I buy?
A: By the calibration requirement: SHT31 for general HVAC and loggers, SHT35 for tighter RH accuracy, SHT45 for the top repeatability on 3.3V-class new designs. The firmware and footprint, not the accuracy, are what force the generation.