SHT15 Humidity and Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The SHT15 is a digital humidity and temperature sensor manufactured by Sensirion AG, designed for applications requiring simultaneous measurement of relative humidity (0–100% RH) and temperature across a wide operating range (-40°C to 123°C). The sensor outputs 12-bit digital data via a proprietary interface and operates from a 2.4V to 5.5V supply voltage with ±2% RH accuracy.

The SHT15 is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, or system upgrades where the original part is no longer readily available or where improved performance characteristics are desired.

Substiute Parts

SHT15

Sensirion AGIn Stock: 2087SHT15 Datasheet

Current PartRFQ

SHT35-DIS-B2.5KS

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

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SHT35-DIS-F2.5KS

Sensirion AGIn Stock: 114423SHT35-DIS-F2.5KS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SHT15 is based on the following critical parameters:

• Sensor Type: Both main and substitute parts must measure humidity and temperature simultaneously
• Humidity Range: Full-range coverage (0–100% RH) is required
• Output Type & Resolution: The substitute must provide digital output; higher resolution (16-bit vs. 12-bit) is acceptable and represents an improvement
• Accuracy: The substitute must meet or exceed the ±2% RH accuracy requirement
• Response Time: 8 s response time is maintained across all substitutes
• Voltage Supply Range: The substitute must operate within or encompass the SHT15 supply voltage window (2.4V–5.5V)
• Operating Temperature Range: The substitute must support the full -40°C to 123°C range or a compatible subset
• Mounting Type: Surface mount packaging is required for PCB integration
• Compliance: RoHS3 compliance and REACH unaffected status must be maintained

The SHT35-DIS-B2.5KS and SHT35-DIS-F2.5KS are direct functional substitutes from the SHT3 series. Both parts meet or exceed all critical parameters and represent active, production-ready alternatives.

Parameter Comparison

Engineering Selection Recommendations

Both SHT35-DIS-B2.5KS and SHT35-DIS-F2.5KS are active, production-ready components suitable for replacing the obsolete SHT15. Selection between the two substitutes is determined by packaging requirements:

• SHT35-DIS-B2.5KS: Supplied in Tape & Reel (TR) packaging, appropriate for high-volume automated assembly operations
• SHT35-DIS-F2.5KS: Supplied in Cut Tape (CT) & Digi-Reel® packaging, suitable for lower-volume or mixed-component procurement

Both parts maintain ROHS3 compliance and REACH unaffected status. The SHT3 series substitutes provide improved accuracy (±1.5% RH vs. ±2% RH), higher output resolution (16-bit vs. 12-bit), and an extended upper operating temperature limit (125°C vs. 123°C). The shift from proprietary digital output to I2C communication requires firmware or driver updates in host systems.

Frequently Asked Questions (FAQ)

Q: Can the SHT35 series directly replace the SHT15 without circuit modifications?

A: The SHT35 series uses I2C communication protocol, whereas the SHT15 uses a proprietary digital interface. While both are surface-mount digital humidity and temperature sensors, the communication protocol differs. Host microcontroller firmware or driver software must be updated to support I2C communication. PCB layout may require minor adjustments due to different package dimensions (10-LCC vs. 8-DFN).

Q: What are the key performance improvements of the SHT35 over the SHT15?

A: The SHT35 provides ±1.5% RH accuracy compared to the SHT15's ±2% RH, representing a 25% improvement in humidity measurement precision. Output resolution increases from 12-bit to 16-bit, enabling finer granularity in sensor readings. Operating temperature range extends to 125°C (vs. 123°C). Supply voltage range is slightly extended to 2.15V minimum.

Q: Are both SHT35 variants electrically identical?

A: Yes. The SHT35-DIS-B2.5KS and SHT35-DIS-F2.5KS are electrically and functionally identical. The difference is packaging format: Tape & Reel (TR) versus Cut Tape (CT) & Digi-Reel®. Selection depends on procurement volume and assembly process requirements.

Q: Do the substitute parts maintain compliance certifications?

A: Yes. Both SHT35 variants are ROHS3 compliant and REACH unaffected, matching the compliance status of the SHT15. Moisture sensitivity level remains at MSL 1 (Unlimited) across all parts.

Q: What is the impact of changing from 12-bit to 16-bit output resolution?

A: Higher resolution provides greater measurement precision and allows for more granular data representation. This is a functional improvement with no negative impact. Host software must be updated to process the increased data width, but this is a straightforward firmware modification.