CS126 Solid State Relay SPST-NO

Part Overview

The CS126 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 device rated for 2A load current at 0-40V output voltage with a 1.4VDC input. The part is currently obsolete, necessitating identification of active substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

CS126

Coto TechnologyIn Stock: 2073CS126 Datasheet

Current PartRFQ

CS128

Coto TechnologyIn Stock: 5916CS128 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The CS128 is qualified as a direct substitute for the CS126 based on the following compatibility criteria:

Matching Parameters (Critical for Substitution):

• Same manufacturer: Coto Technology
• Same series: COTOMOS™
• Identical circuit topology: SPST-NO (1 Form A)
• Identical mounting type: Surface Mount
• Identical package: 6-SMD (0.300", 7.62mm)
• Identical termination style: Gull Wing
• Identical output voltage range: 0 V – 40 V
• Identical output type: AC, DC
• Compatible input voltage: 1.37VDC (CS128) vs 1.4VDC (CS126)
• Same RoHS3 compliance
• Same MSL rating: 2 (1 Year)

Enhanced Capabilities: The CS128 provides superior electrical performance with increased load current capacity (4.5A vs 2A) and significantly lower on-state resistance (50 mOhms vs 500 mOhms), making it a compatible upgrade path for the obsolete CS126.

Parameter Comparison

Engineering Selection Recommendations

CS128 as Primary Substitute:

The CS128 is the direct replacement for the obsolete CS126. Both components share identical mechanical and electrical specifications across all critical parameters, with the exception of enhanced electrical performance in the CS128. The CS128 maintains active product status with ROHS3 compliance and identical moisture sensitivity ratings, ensuring long-term supply availability and regulatory compliance. The identical package footprint (6-SMD, 0.300" / 7.62mm) and gull wing termination enable direct PCB assembly substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Are CS126 and CS128 pin-compatible? Both components use the same 6-SMD package with gull wing termination and identical electrical interface specifications, supporting direct PCB assembly substitution.

Q: What are the electrical differences between CS126 and CS128? The CS128 provides increased load current capacity (4.5A vs 2A) and lower on-state resistance (50 mOhms vs 500 mOhms). Input voltage specifications are functionally equivalent (1.37VDC vs 1.4VDC). Both support identical 0–40V output voltage range and AC/DC switching capability.

Q: Does the CS128 require circuit design changes? No. The CS128 operates within the same input and output voltage ranges as the CS126, with compatible circuit topology and switching characteristics. No circuit modifications are required for substitution.

Q: What regulatory certifications apply to CS128? The CS128 maintains ROHS3 compliance and carries the same MSL rating (2 / 1 Year) as the obsolete CS126, ensuring compatibility with current environmental and handling requirements.

Q: Is the CS128 readily available? The CS128 holds active product status with documented inventory availability in the COTOMOS™ series, unlike the obsolete CS126.