SCD42-D-R2 Equivalent & Substitute Parts

Part Overview

The SCD42-D-R2 is a Carbon Dioxide (CO2) Sensor with I2C digital output manufactured by Sensirion AG. This component is designed for air quality monitoring applications requiring direct CO2 measurement via I2C communication protocol. The SCD42-D-R2 is classified as obsolete, necessitating identification of active equivalent components for new designs and ongoing production requirements. The substitute part identified maintains functional compatibility through equivalent electrical interfaces and communication protocols.

Substiute Parts

SCD42-D-R2

Sensirion AGIn Stock: 981SCD42-D-R2 Datasheet

Current PartRFQ

SCD41-D-R2

Sensirion AGIn Stock: 114288SCD41-D-R2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCD42-D-R2 is based on the following critical parameters that ensure functional and electrical compatibility:

Primary Compatibility Criteria:

• Identical manufacturer (Sensirion AG)
• Matching output interface (I2C digital communication)
• Overlapping supply voltage range (2.4V ~ 5.5V)
• Compatible RoHS and REACH compliance status
• Sensor category within air quality/CO2 measurement domain

The SCD41-D-R2 qualifies as a direct substitute based on these parameters. Both components share the same supply voltage specification, I2C communication protocol, and regulatory compliance certifications. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution:

The SCD41-D-R2 is suitable for direct substitution in applications currently using the SCD42-D-R2. Both components maintain identical supply voltage specifications (2.4V ~ 5.5V) and I2C communication protocols, ensuring compatibility with existing circuit designs and firmware implementations.

Regulatory and Compliance Alignment:

Both the SCD42-D-R2 and SCD41-D-R2 carry ROHS3 compliance and REACH Unaffected status, meeting current environmental and hazardous substance regulations. No additional compliance modifications are required when transitioning between these components.

Production Status Consideration:

The SCD42-D-R2 is obsolete with no ongoing manufacturing. The SCD41-D-R2 maintains active production status with substantial inventory availability (114,217 pieces), ensuring reliable supply for new designs and production continuity.

Operating Environment:

The SCD41-D-R2 provides an extended operating temperature range (-10°C ~ 60°C) compared to the SCD42-D-R2 (0°C ~ 50°C). This extended range offers additional flexibility for applications requiring operation at lower or higher ambient temperatures.

Frequently Asked Questions (FAQ)

Q: Can the SCD41-D-R2 directly replace the SCD42-D-R2 in existing designs?

A: Yes. Both components share identical supply voltage specifications (2.4V ~ 5.5V) and I2C communication protocols. No circuit modifications are required for direct substitution.

Q: Are there differences in packaging between these components?

A: The SCD42-D-R2 packaging is specified as standard SMD. The SCD41-D-R2 is available in Cut Tape (CT) and Digi-Reel® packaging formats. Verify packaging compatibility with your procurement and assembly processes.

Q: What is the significance of the extended temperature range in the SCD41-D-R2?

A: The SCD41-D-R2 operates from -10°C to 60°C, compared to the SCD42-D-R2 range of 0°C to 50°C. This extended range accommodates applications requiring operation in colder or hotter environments without component replacement.

Q: Are both components compliant with current environmental regulations?

A: Yes. Both the SCD42-D-R2 and SCD41-D-R2 are ROHS3 compliant and REACH Unaffected, meeting current environmental and hazardous substance regulations.

Q: Why is the SCD42-D-R2 listed as obsolete?

A: The SCD42-D-R2 has been discontinued by the manufacturer. The SCD41-D-R2 represents the active production equivalent within the Sensirion CO2 sensor product line.

Q: What is the Moisture Sensitivity Level (MSL) difference between these parts?

A: The SCD42-D-R2 has MSL 1 (Unlimited), while the SCD41-D-R2 has MSL 3 (168 Hours). This affects storage and handling requirements. Verify storage conditions align with your supply chain practices.

Q: Are the I2C communication protocols identical between both components?

A: Both components utilize I2C digital output. Consult component datasheets for specific register maps and command structures to ensure firmware compatibility.