SHT30 Sensor Guide: Pinout, I²C Address, Accuracy and Module Types

SHT30-DIS quick specifications

The figures below apply to the SHT30-DIS digital IC, not automatically to every module, cable assembly or transmitter bearing “SHT30” in its name. Typical accuracy is not a worst-case system guarantee.Its functionality includes enhanced signal processing, two distinctive and user selectable I2C addresses and communication speeds of up to 1 MHz.SHT30 can mean a bare digital IC, an analog variant, a breakout board, a cabled probe or a complete industrial transmitter. Identify the exact part and its external interface before choosing wiring or code.

Parameter	SHT30-DIS value	Design meaning
Interface	I²C, up to 1 MHz	Check host timing and complete bus conditions.
7-bit address	0x44 default; 0x45 alternate	ADDR low selects 0x44; high selects 0x45.
Supply	2.15–5.5 V	The breakout board may impose its own limits.
Typical RH accuracy	±2 %RH	Consult the tolerance curves across humidity and temperature.
Typical temperature accuracy	±0.2 °C at 0–65 °C	Does not include PCB or enclosure heating.
Specified ranges	0–100 %RH; −40 to 125 °C	Accuracy changes across the range.
Package and data	2.5 × 2.5 × 0.9 mm DFN-8; CRC-8 after each 16-bit data word	Use the exact package drawing and verify both checksums.

SHT30-DIS-B The SHT3x humidity sensor series consists of a low-cost version with the SHT30 humidity sensor, a standard version with the SHT31 humidity sensor, and a high-end version with the SHT35 humidity sensor

Serial Clock and Serial Data (SCL, SDA) SCL is used to synchronize the communication between microcontroller and the sensor. The clock frequency can be freely chosen between 0 to 1000 kHz. Commands with clock stretching according to I2C Standard11 are supported.).

Why do SHT30 modules have different pins and protocols?

“SHT30 sensor” is used for both a component and products built around it. The external connector belongs to the module or instrument maker. The following comparison prevents a common error: applying an I²C example to analog outputs or an RS485 transmitter.

“Waterproof” in a listing is not a universal immersion rating. A humidity probe must admit air at its sensing opening; verify the exact enclosure rating and use conditions.

Where does the SHT30 sit in the system?

The bare IC is only the sensing layer. A breakout adds a PCB and connector. A protective probe adds a cable and housing. An RS485 transmitter also adds conversion electronics and a controller-facing protocol.

This explains why an SHT30-based RS485 product is not addressable at 0x44 from a PLC: that address exists on the internal I²C side, while the external A/B pair belongs to the transmitter.

How can you identify the SHT30 interface before wiring?

Read the complete product's part number and terminal labels. The visible connector decides which host peripheral to use; wire color alone is not a standard.

Use the terminal labels as the first branch. SDA/SCL implies an I²C host. T/RH or AO points to analog outputs and an ADC. A/B points to a differential serial interface that requires a transmitter-specific protocol manual. Confirm the supply pins separately; never infer them from wire colors.

If the board has four unlabeled wires, stop at the product datasheet. Even an established probe vendor warns that wire colors may vary between batches.

What is the SHT30-DIS pinout?

The SHT30-DIS is an eight-pin DFN component. The drawing below shows the manufacturer's transparent top view: pins 1–4 descend on the left; pins 8–5 descend on the right. A breakout's four connector pins are a different pinout.

Pin 2, ADDR, must be tied high or low; do not leave it floating. Pin 7, R, has no signal function but connects to VSS. The center die pad is internally connected to VSS. Place a 100 nF capacitor close to VDD and VSS, as the datasheet recommends.

What is the SHT30 I²C address: 0x44 or 0x45?

SHT30-DIS uses the 7-bit address 0x44 when ADDR is low and 0x45 when ADDR is high. ADDR cannot float. Some breakout or probe designs fix the selection in hardware, so inspect the exact board before expecting both options. Sensirion specifies the address at the IC level; Adafruit's cabled probe is an example fixed at 0x44.

For Arduino Uno, ESP32 and ESP8266 wiring, a scanner sketch and measurement code, continue to the SHT30 Arduino wiring and troubleshooting guide. If the scan finds 0x44 but readings fail, see the transaction and CRC diagnostic guide.

How accurate is SHT30 in a finished product?

Sensirion specifies typical SHT30-DIS accuracy of ±2 %RH and ±0.2 °C over 0–65 °C for temperature. These are device specifications under the datasheet's conditions. Airflow, enclosure temperature, PCB heating, contamination, condensation and assembly can add system error. A valid I²C frame cannot prove that the sensing element is exposed to the intended ambient air.

Which SHT30 product format should you choose?

Choose the interface at the system boundary. A cabled I²C probe can still be unsuitable for a long, noisy cable; an industrial transmitter adds interface circuitry and its own performance limits. Evaluate the finished assembly, not just the sensing IC.

Where does NYFEA FHT30 fit?

NYFEA FHT30 is a candidate for evaluation in SHT30-based digital designs. NYFEA documents a 2.0–5.5 V supply, selectable 0x44/0x45 addresses, CRC-protected I²C data and a DFN-8 package. Those shared features start a comparison; they do not establish pin, firmware, measurement or production compatibility. FHT30 is a board-level IC, not a finished probe or RS485 transmitter. [7]

For a controlled review, send the exact SHT30 order code, schematic, PCB footprint, firmware command list, expected temperature/RH limits, assembly process and final enclosure conditions. Compare those against the current FHT30 specification and measured samples.