SHTW2 Humidity and Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The SHTW2 is a digital humidity and temperature sensor manufactured by Sensirion AG, designed for applications requiring combined environmental monitoring in compact surface-mount packages. The sensor operates over a humidity range of 0 to 100% RH with ±3% RH accuracy and communicates via I2C protocol. The SHTW2 is classified as obsolete, making identification of compatible substitute components essential for ongoing system support, redesigns, and new production runs where this sensor is no longer available from primary sources.

Substiute Parts

SHTW2

Sensirion AGIn Stock: 16280SHTW2 Datasheet

Current PartRFQ

SHTC3-TR-2.5KS

Sensirion AGIn Stock: 48193SHTC3-TR-2.5KS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SHTC3-TR-2.5KS qualifies as a direct substitute for the SHTW2 based on the following substitution criteria:

Functional Compatibility:

• Both sensors measure humidity and temperature over identical ranges (0 ~ 100% RH, -40°C ~ 125°C)
• Both use I2C communication protocol with 16-bit output resolution
• Both maintain 8-second response time specification
• Both are manufactured by Sensirion AG, ensuring protocol and command compatibility

Electrical Compatibility:

• SHTC3-TR-2.5KS supply voltage range (1.62V ~ 3.6V) encompasses the SHTW2 requirement (1.62V ~ 1.98V), providing backward compatibility
• Both operate within the same temperature extremes

Mechanical Compatibility:

• Both are surface-mount devices suitable for automated assembly
• Package footprints differ (SHTW2: 4-WLCSP; SHTC3-TR-2.5KS: 4-DFN), requiring PCB layout modification

Performance Enhancement:

• SHTC3-TR-2.5KS offers improved accuracy (±2% RH versus ±3% RH), providing superior measurement precision

Compliance & Availability:

• SHTC3-TR-2.5KS maintains ROHS3 compliance and MSL 1 rating
• SHTC3-TR-2.5KS is in active production status with substantial inventory availability

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SHTC3-TR-2.5KS

The SHTC3-TR-2.5KS is the recommended substitute for SHTW2 applications. Selection rationale:

• Product Status: SHTC3-TR-2.5KS is in active production, ensuring long-term availability and supply chain stability, whereas SHTW2 is obsolete
• Functional Equivalence: Identical sensor type, measurement range, I2C protocol, output resolution, and response time enable direct functional replacement
• Electrical Compatibility: Supply voltage range encompasses SHTW2 requirements, permitting use in existing power supply designs
• Performance Improvement: ±2% RH accuracy exceeds SHTW2 specification, providing measurement precision enhancement
• Compliance Certification: ROHS3 compliance and MSL 1 rating match SHTW2, maintaining regulatory and manufacturing process compatibility

Implementation Consideration:

Package transition from 4-WLCSP to 4-DFN requires PCB layout redesign. Footprint, solder pad geometry, and thermal management characteristics differ between packages. Thermal design review is necessary to ensure adequate heat dissipation in the new package configuration.

Frequently Asked Questions (FAQ)

Q: Can SHTC3-TR-2.5KS directly replace SHTW2 without firmware changes?

A: Yes. Both sensors use identical I2C communication protocol and 16-bit output format. Firmware modifications are not required for protocol compatibility. However, PCB layout redesign is mandatory due to different package geometries.

Q: What is the primary difference between SHTW2 and SHTC3-TR-2.5KS?

A: The SHTC3-TR-2.5KS offers improved humidity accuracy (±2% RH versus ±3% RH), extended supply voltage range (1.62V ~ 3.6V versus 1.62V ~ 1.98V), and active production status. The SHTW2 is obsolete. Both maintain identical measurement ranges, I2C protocol, response time, and operating temperature specifications.

Q: Are there package compatibility issues?

A: Yes. SHTW2 uses 4-WLCSP package (0.74x1.31 mm), while SHTC3-TR-2.5KS uses 4-DFN package (2x2 mm). PCB footprint, solder pad layout, and component placement differ significantly. Schematic and layout modifications are required.

Q: Does SHTC3-TR-2.5KS work with existing power supplies designed for SHTW2?

A: Yes. SHTC3-TR-2.5KS supply voltage range (1.62V ~ 3.6V) encompasses SHTW2 requirements (1.62V ~ 1.98V). Existing power supply designs operate within the substitute's specifications.

Q: Are both sensors RoHS compliant?

A: Yes. Both SHTW2 and SHTC3-TR-2.5KS are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting identical environmental and manufacturing standards.

Q: What is the supply voltage advantage of SHTC3-TR-2.5KS?

A: SHTC3-TR-2.5KS operates from 1.62V to 3.6V, compared to SHTW2's 1.62V to 1.98V. This extended upper voltage limit permits use in systems with higher supply voltages without additional voltage regulation, simplifying power distribution design.

Q: Is SHTC3-TR-2.5KS available in other packaging options?

A: The specified part number SHTC3-TR-2.5KS includes Tape & Reel (TR) packaging. Sensirion AG manufactures SHTC3 variants in multiple package formats; consult the manufacturer for alternative packaging configurations if required.