SHT40-BD1B-R3 Equivalent & Substitute Parts

Part Overview

The SHT40-BD1B-R3 is an integrated humidity and temperature sensor manufactured by Sensirion AG, part of the SHT4 series. This surface-mount sensor combines relative humidity measurement (0–100% RH) with temperature sensing, communicating via I2C protocol with a secondary I2C address option. The device is actively produced and widely used in environmental monitoring, HVAC systems, and portable instrumentation applications. Substitute parts may be required due to inventory constraints, supply chain disruptions, or design revisions while maintaining identical electrical and mechanical performance.

Substiute Parts

SHT40-BD1B-R3

Sensirion AGIn Stock: 10503SHT40-BD1B-R3 Datasheet

Current PartRFQ

SHT40-BD1B-R2

Sensirion AGIn Stock: 30391SHT40-BD1B-R2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Sensor Type: Humidity and Temperature
• Humidity Range: 0–100% RH
• Humidity Accuracy: ±1.8% RH
• Output Type: I2C with secondary address capability
• Output Resolution: 16-bit
• Response Time: 6 s
• 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)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

Both parts are from the same manufacturer (Sensirion AG), same series (SHT4), and share identical electrical specifications and mechanical form factors. The suffix designation (R3 vs. R2) reflects internal manufacturing or packaging revision levels that do not affect functional performance or compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the SHT40-BD1B-R3 and SHT40-BD1B-R2 are active products from Sensirion AG with full ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and consumer applications. Selection between these parts should be based on availability and supply chain considerations. The SHT40-BD1B-R2 currently has higher inventory availability (30,300 pcs) compared to the SHT40-BD1B-R3 (10,428 pcs), making it a viable alternative for high-volume procurement. Both parts are packaged in Tape & Reel format suitable for automated assembly processes. No functional or performance trade-offs exist between these variants.

Frequently Asked Questions (FAQ)

Q: Can SHT40-BD1B-R2 be used as a direct replacement for SHT40-BD1B-R3 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 communication protocol, pin configuration, and package footprint are identical.

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

A: The suffix reflects internal manufacturing or packaging revision levels assigned by Sensirion AG. These revisions do not affect functional performance, electrical characteristics, or mechanical compatibility.

Q: Are there any differences in I2C addressing between these parts?

A: No. Both parts support the secondary I2C address option as indicated in their descriptions. I2C protocol implementation and addressing schemes are identical.

Q: What is the moisture sensitivity level, and does it affect storage or handling?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard component storage practices apply; no special dry-pack or desiccant requirements are necessary.

Q: Are both parts suitable for the full operating temperature range of −40°C to +125°C?

A: Yes. Both the SHT40-BD1B-R3 and SHT40-BD1B-R2 are rated for the complete operating temperature range of −40°C to +125°C with identical accuracy specifications across this range.

Q: What is the 4-DFN (1.5×1.5) package footprint, and is it compatible with standard PCB assembly equipment?

A: The 4-DFN (1.5×1.5) is a 4-pin Dual Flat No-Lead package with 1.5 mm × 1.5 mm dimensions. This is a standard surface-mount package compatible with modern pick-and-place assembly equipment and standard reflow soldering processes.

Q: Can these sensors be used interchangeably in high-volume production?

A: Yes. Both parts meet identical specifications and are supplied in Tape & Reel packaging suitable for automated assembly. Production line qualification requires no changes when switching between these variants.