SHT75 Humidity and Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The SHT75 is a digital humidity and temperature sensor module manufactured by Sensirion AG, designed for applications requiring simultaneous measurement of relative humidity (0–100% RH) and temperature across an extended operating range (-40°C to 125°C). The sensor delivers 12-bit digital output with ±1.8% RH accuracy and an 8-second response time, operating from a 2.4V to 5.5V supply. The SHT75 is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing system support.

Substiute Parts

SHT75

Sensirion AGIn Stock: 1612SHT75 Datasheet

Current PartRFQ

SHT35-DIS-B2.5KS

Sensirion AGIn Stock: 2034SHT35-DIS-B2.5KS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SHT75 is determined by the following critical parameters:

• Sensor Functionality: Both humidity and temperature measurement capability across 0–100% RH and -40°C to 125°C operating range
• Output Resolution and Accuracy: Minimum 12-bit output with accuracy equal to or better than ±1.8% RH
• Response Time: 8-second response time or faster
• Supply Voltage Compatibility: Operating voltage range must encompass or overlap with 2.4V–5.5V
• Environmental Compliance: ROHS3 compliance and REACH unaffected status required
• Regulatory Classification: ECCN EAR99 and HTSUS alignment

The SHT35-DIS-B2.5KS qualifies as a direct substitute based on these parameters. While the SHT35 employs surface-mount packaging and I2C digital output (versus the SHT75's through-hole module and direct digital interface), it meets or exceeds all functional and environmental requirements, offering improved accuracy (±1.5% RH) and higher output resolution (16-bit).

Parameter Comparison

Engineering Selection Recommendations

The SHT75 is classified as obsolete; the SHT35-DIS-B2.5KS is the manufacturer-recommended substitute and maintains active product status. Both components satisfy ROHS3 compliance, REACH unaffected designation, and EAR99 export classification requirements.

Selection of the SHT35-DIS-B2.5KS requires accommodation of the following design changes:

• Interface Protocol: The SHT35 uses I2C serial communication, whereas the SHT75 employs direct digital output. Host microcontroller firmware must be updated to support I2C protocol and address configuration.
• Packaging and Mounting: The SHT35 is a surface-mount component in 8-VFDFN package, requiring PCB redesign if the original design utilized through-hole mounting.
• Supply Voltage Lower Limit: The SHT35 operates from 2.15V minimum, compared to the SHT75's 2.4V minimum, providing improved low-voltage performance.

Both components operate across the full -40°C to 125°C temperature range with identical 8-second response time. The SHT35 delivers superior accuracy (±1.5% RH versus ±1.8% RH) and higher resolution (16-bit versus 12-bit output).

Frequently Asked Questions (FAQ)

Q: Can the SHT35-DIS-B2.5KS be used as a direct pin-for-pin replacement for the SHT75?

A: No. The SHT75 is a 4-pin through-hole module with direct digital output, while the SHT35-DIS-B2.5KS is an 8-pin surface-mount component with I2C interface. PCB redesign and firmware modification are required.

Q: What are the key functional differences between the SHT75 and SHT35-DIS-B2.5KS?

A: Both sensors measure humidity (0–100% RH) and temperature (-40°C to 125°C) with 8-second response time. The SHT35 offers improved accuracy (±1.5% RH versus ±1.8% RH), higher output resolution (16-bit versus 12-bit), and I2C digital communication. The SHT75 uses direct digital output and through-hole packaging.

Q: Are both components compliant with current environmental and export regulations?

A: Yes. Both the SHT75 and SHT35-DIS-B2.5KS are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes.

Q: What is the minimum supply voltage for each component?

A: The SHT75 requires 2.4V minimum; the SHT35-DIS-B2.5KS requires 2.15V minimum. Both operate up to 5.5V.

Q: Does the SHT35-DIS-B2.5KS maintain the same humidity measurement range as the SHT75?

A: Yes. Both components measure across the full 0–100% RH range with identical operating temperature limits (-40°C to 125°C).