CS137 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The CS137 is a Solid State SPST-NO (1 Form A) relay manufactured by Coto Technology in the COTOMOS™ series. This component is a surface-mount, 6-SMD package solid state relay rated for 400 mA at 0-60V load voltage with a 1.37VDC input. The CS137 has reached obsolete product status. Alternative models must be identified to maintain circuit continuity in applications requiring equivalent or higher current-handling capacity with compatible electrical and mechanical specifications.

Substiute Parts

CS137

Coto TechnologyIn Stock: 2691CS137 Datasheet

Current PartRFQ

CS136

Coto TechnologyIn Stock: 4304CS136 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS137 is based on maintaining compatibility across the following key parameters:

• Circuit Configuration: SPST-NO (1 Form A) topology must be preserved
• Electrical Ratings: Input voltage of 1.37VDC and load voltage range of 0-60V must be supported
• Load Current: Substitute parts must support a minimum of 400 mA; higher current capacity is acceptable
• Package / Case: 6-SMD (0.300", 7.62mm) with gull wing termination required for PCB compatibility
• Mounting Type: Surface mount configuration required
• Compliance: RoHS3 compliance and MSL-2 rating required
• Output Type: AC and DC load switching capability required

The CS136 is a direct substitute manufactured by Coto Technology in the same COTOMOS™ series. It shares the identical input voltage, load voltage range, package configuration, and termination style as the CS137. The key difference is an increased load current rating of 2.5 A, which exceeds the CS137's 400 mA specification, allowing the CS136 to serve as a drop-in replacement in applications requiring the original 400 mA or higher current demands.

Parameter Comparison

Engineering Selection Recommendations

The CS136 is the available substitute for the obsolete CS137. Both components are manufactured by Coto Technology and comply with ROHS3 and REACH requirements. The CS136 maintains full compatibility with the CS137 across all mechanical and electrical interface parameters: identical input voltage, load voltage range, package dimensions, and termination style.

The CS136 provides a higher load current rating of 2.5 A compared to the CS137's 400 mA specification. This increase in current capacity, combined with the significantly lower on-state resistance (140 mOhms versus 1.6 Ohms), positions the CS136 as a superior replacement. The substitution introduces no compatibility concerns for PCB layout or circuit integration.

The active product status of the CS136 ensures continued availability and supply chain stability, addressing the obsolescence issue of the original CS137.

Frequently Asked Questions (FAQ)

Q: Can the CS136 replace the CS137 in all applications?

A: Yes. The CS136 and CS137 are mechanically and electrically compatible across all critical interface parameters. Both support 1.37VDC input and 0-60V load voltage. The CS136's higher current rating (2.5 A versus 400 mA) does not create compatibility issues; it extends the component's applicability to higher-current loads.

Q: What is the difference in on-state resistance between these parts?

A: The CS137 has a maximum on-state resistance of 1.6 Ohms, while the CS136 has a maximum of 140 mOhms. The lower resistance in the CS136 reduces voltage drop and power dissipation during operation, improving overall circuit efficiency.

Q: Are both parts suitable for AC and DC load switching?

A: Yes. Both the CS137 and CS136 are rated for AC and DC output switching across the 0-60V load voltage range.

Q: Is the package footprint identical?

A: Yes. Both components use a 6-SMD (0.300", 7.62mm) package with gull wing termination. No PCB layout modifications are required for substitution.

Q: What is the product status of each component?

A: The CS137 is obsolete, while the CS136 is active. The CS136's active status ensures long-term supply availability.

Q: Are there any compliance differences between these parts?

A: No. Both the CS137 and CS136 are ROHS3 compliant with REACH unaffected status and MSL-2 (1 Year) moisture sensitivity rating.