SHT40-CD1B-R3 Equivalent & Substitute Parts

Part Overview

The SHT40-CD1B-R3 is a surface-mount humidity and temperature sensor manufactured by Sensirion AG, part of the SHT4 series. This component integrates a third I2C address option and delivers combined relative humidity and temperature measurements with I2C digital output. The sensor is actively produced and widely stocked, with 10,683 units available in inventory. Finding equivalent or substitute parts may be necessary for design flexibility, supply chain optimization, or specific application requirements where alternative calibration certifications are beneficial.

Substiute Parts

SHT40-CD1B-R3

Sensirion AGIn Stock: 10784SHT40-CD1B-R3 Datasheet

Current PartRFQ

SHT43-ADCB-R2

Sensirion AGIn Stock: 5331SHT43-ADCB-R2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SHT40-CD1B-R3 is determined by strict alignment of the following critical parameters:

• Sensor Type: Humidity and Temperature combined measurement
• Humidity Range: 0 ~ 100% RH full-scale coverage
• Output Type: I2C digital interface
• Output Resolution: 16-bit data format
• Accuracy: ±1.8% RH measurement tolerance
• Response Time: 4 second settling time
• Supply Voltage: 1.08V ~ 3.6V operating range
• Operating Temperature: -40°C ~ 125°C thermal range
• Mounting Type: Surface Mount configuration
• Package / Case: 4-UDFN Exposed Pad form factor
• Supplier Device Package: 4-DFN (1.5x1.5) physical dimensions
• Compliance: ROHS3 Compliant, REACH Unaffected status

The SHT43-ADCB-R2 meets all these criteria and qualifies as a parametric equivalent. The primary distinction is the inclusion of 3-point calibration with ISO17025 certification on the substitute part, which represents an enhanced quality assurance attribute rather than a functional or electrical difference.

Parameter Comparison

Engineering Selection Recommendations

Both the SHT40-CD1B-R3 and SHT43-ADCB-R2 are active products from Sensirion AG with identical electrical and mechanical specifications. Selection between these parts should be based on the following factors:

SHT40-CD1B-R3 is appropriate for applications where standard manufacturing quality assurance is sufficient. This part maintains full compliance with ROHS3 and REACH requirements and is currently stocked with 10,683 units available.

SHT43-ADCB-R2 is appropriate for applications requiring enhanced traceability and calibration documentation. This part includes 3-point calibration with ISO17025 certification, providing additional quality assurance documentation. Current inventory is 5,261 units.

Both parts are suitable for direct substitution in circuit designs, PCB layouts, and firmware implementations without modification. The choice between them depends on quality documentation requirements and supply chain availability rather than functional performance.

Frequently Asked Questions (FAQ)

Q: Can the SHT43-ADCB-R2 be used as a direct replacement for the SHT40-CD1B-R3 in existing designs?

A: Yes. Both parts share identical electrical specifications, I2C interface protocol, 16-bit output resolution, ±1.8% RH accuracy, and 4-UDFN Exposed Pad package. No circuit modifications, PCB layout changes, or firmware updates are required for substitution.

Q: What is the difference between these two parts?

A: The primary difference is calibration certification. The SHT43-ADCB-R2 includes 3-point calibration with ISO17025 certification, while the SHT40-CD1B-R3 uses standard manufacturing calibration. All electrical and mechanical parameters are identical.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 4-UDFN Exposed Pad package with 4-DFN (1.5x1.5) physical dimensions. PCB footprints, solder pad layouts, and mounting procedures are identical.

Q: Do both parts support the same I2C address options?

A: Both parts are from the SHT4 series with I2C digital output. The SHT40-CD1B-R3 designation includes a third I2C address option. Consult the respective datasheets for specific I2C address configurations available on each variant.

Q: What is the moisture sensitivity level for both parts?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the SHT40-CD1B-R3 and SHT43-ADCB-R2 are ROHS3 Compliant and REACH Unaffected.