SHT40-BD1B-R2 Equivalent & Substitute Parts

Part Overview

The SHT40-BD1B-R2 is an integrated humidity and temperature sensor manufactured by Sensirion AG, part of the SHT4 series. This surface mount component combines relative humidity measurement (0–100% RH) with temperature sensing, communicating via I2C protocol with a secondary address option. The device is actively produced and widely deployed in environmental monitoring, HVAC control, and portable instrumentation applications. Substitute parts may be required due to supply chain constraints, inventory availability, or design revision cycles while maintaining identical electrical and mechanical compatibility.

Substiute Parts

SHT40-BD1B-R2

Sensirion AGIn Stock: 30391SHT40-BD1B-R2 Datasheet

Current PartRFQ

SHT40-BD1B-R3

Sensirion AGIn Stock: 10503SHT40-BD1B-R3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The SHT40-BD1B-R2 has one parametric equivalent substitute: SHT40-BD1B-R3. Substitution eligibility is determined by strict equivalence across the following critical parameters:

• Sensor Type: Humidity and Temperature
• Humidity Range: 0–100% RH
• Accuracy: ±1.8% RH
• Output Type: I2C protocol with secondary address capability
• Output Resolution: 16-bit
• Response Time: 6 seconds
• Supply Voltage Range: 1.08V–3.6V
• Operating Temperature Range: −40°C to +125°C
• Package / Case: 4-UDFN Exposed Pad
• Supplier Device Package: 4-DFN (1.5×1.5)
• Mounting Type: Surface Mount
• RoHS and REACH Compliance: ROHS3 Compliant, REACH Unaffected

Both parts are manufactured by Sensirion AG within the SHT4 series and maintain identical electrical performance, pinout, and mechanical form factor. The suffix designation (R2 vs. R3) reflects internal manufacturing or firmware revision without affecting functional or electrical characteristics relevant to circuit design and application integration.

Parameter Comparison

Engineering Selection Recommendations

Both SHT40-BD1B-R2 and SHT40-BD1B-R3 are active production parts from Sensirion AG with full ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on availability and supply chain requirements rather than technical differentiation. Both parts satisfy identical design specifications for humidity and temperature measurement applications requiring I2C communication, 16-bit resolution, and operation across −40°C to +125°C environments. The 4-DFN (1.5×1.5) surface mount package and MSL 1 rating ensure compatibility with standard reflow soldering processes and indefinite shelf life storage without baking requirements.

Frequently Asked Questions (FAQ)

Q: Can SHT40-BD1B-R3 be used as a direct replacement for SHT40-BD1B-R2 in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. No circuit modifications, firmware changes, or PCB layout adjustments are required. The I2C protocol implementation, pin configuration, and performance characteristics are identical.

Q: What does the suffix designation (R2 vs. R3) indicate?

A: The suffix reflects an internal manufacturing or firmware revision level assigned by Sensirion AG. This designation does not affect electrical performance, accuracy, response time, or functional behavior in circuit applications.

Q: Are there any differences in supply voltage or operating temperature ranges?

A: No. Both parts operate across 1.08V–3.6V supply voltage and −40°C to +125°C temperature range with identical accuracy (±1.8% RH) and response time (6 seconds).

Q: Do both parts require the same PCB footprint and reflow profile?

A: Yes. Both parts use the 4-UDFN Exposed Pad package with 4-DFN (1.5×1.5) dimensions. PCB footprints, solder paste stencil designs, and reflow temperature profiles are identical. MSL 1 rating applies to both parts.

Q: Which part should be selected for new designs?

A: Either part is acceptable for new designs. Selection should be based on current supplier inventory, lead time, and cost availability. Both parts carry identical active product status and full compliance certifications.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant and REACH unaffected. All regulatory and environmental certifications are identical.