CS331 Solid State Relay SPST-NO

Part Overview

The CS331 is a Solid State SPST-NO (1 Form A) relay manufactured by Coto Technology, rated for 110 mA load current at 0-350V. This surface mount device features gull wing termination in an 8-SMD (0.300", 7.62mm) package. The CS331 is classified as obsolete, requiring identification of functionally equivalent alternatives for new designs and ongoing production support.

Substiute Parts

CS331

Coto TechnologyIn Stock: 2757CS331 Datasheet

Current PartRFQ

VOR2142B8T

Vishay Semiconductor Opto DivisionIn Stock: 809VOR2142B8T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The VOR2142B8T is identified as a direct substitute for the CS331 based on the following electrical and mechanical compatibility criteria:

Electrical Compatibility:

• Identical circuit configuration: SPST-NO (1 Form A) x 2
• Input voltage: 1.36 VDC (within 0.01 VDC deviation from 1.37 VDC)
• Load voltage rating: 0 V ~ 400 V (exceeds 0-350 V requirement)
• Load current: 140 mA (exceeds 110 mA requirement)
• Output capability: AC and DC loads
• On-state resistance: 27 Ohms (acceptable variation from 24 Ohms maximum)

Mechanical Compatibility:

• Identical package: 8-SMD (0.300", 7.62mm)
• Identical termination style: Gull Wing
• Identical mounting type: Surface mount

Parameter Comparison

Engineering Selection Recommendations

The VOR2142B8T is the applicable substitute for the obsolete CS331. Both devices are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for current applications. The VOR2142B8T holds active product status with unlimited moisture sensitivity level (MSL 1) compared to the CS331's one-year limitation (MSL 2), providing superior storage and handling characteristics. All electrical and mechanical parameters align within acceptable engineering tolerances for drop-in replacement in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the VOR2142B8T directly replace the CS331 in existing designs? A: Yes. Both devices share identical circuit configurations, package geometry, and termination styles. The VOR2142B8T's higher voltage rating (400V vs. 350V) and current capacity (140 mA vs. 110 mA) exceed CS331 specifications, ensuring compatibility in all operating conditions.

Q: What is the significance of the different on-state resistance values (24 Ohms vs. 27 Ohms)? A: Both values are maximum ratings and fall within acceptable variation for this relay category. The VOR2142B8T's 27-ohm maximum resistance remains functionally equivalent for load switching applications.

Q: Is the input voltage difference (1.37 VDC vs. 1.36 VDC) significant? A: No. The 0.01 VDC difference is negligible and well within normal circuit design tolerances for trigger voltage specifications.

Q: How do the moisture sensitivity levels differ, and does it matter? A: The VOR2142B8T (MSL 1, unlimited storage) offers superior environmental tolerance compared to the CS331 (MSL 2, one-year storage). This provides longer shelf life and reduced handling restrictions in manufacturing environments.

Q: Are both packages compatible with standard pick-and-place assembly equipment? A: Yes. Both devices utilize identical 8-SMD (0.300", 7.62mm) packages with gull wing termination, compatible with standard surface mount assembly processes.