CS334 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The CS334 is a solid-state relay manufactured by Coto Technology in the COTOMOS™ series. This surface-mount device functions as a SPST-NO (Single Pole Single Throw - Normally Open) relay with dual form-A configurations, rated for 180 mA load current and 0–200 V operation. The CS334 is classified as obsolete, necessitating identification of active substitute components for ongoing design requirements and inventory replenishment. Active alternatives with compatible electrical specifications and matching package geometry ensure continuity in manufacturing and field applications.

Substiute Parts

CS334

Coto TechnologyIn Stock: 2270CS334 Datasheet

Current PartRFQ

VOR2121B8T

Vishay Semiconductor Opto DivisionIn Stock: 5471VOR2121B8T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The VOR2121B8T represents a direct functional substitute for the CS334 based on the following equivalence criteria:

Compatible Parameters:

• Identical circuit configuration (SPST-NO with dual Form A contacts)
• Matching package geometry (8-SMD, 0.300" / 7.62mm)
• Identical termination style (Gull Wing)
• Equivalent input voltage specification (1.36 VDC vs. 1.37 VDC)
• Compatible output type (AC, DC operation)
• ROHS3 compliance alignment

Enhanced Performance Characteristics:

• Higher load voltage rating (0–250 V vs. 0–200 V)
• Increased load current capacity (200 mA vs. 180 mA)
• Active product status with unlimited MSL rating
• Improved moisture sensitivity profile

The VOR2121B8T operates within an extended operating envelope while maintaining pinout and package compatibility with the obsolete CS334 design.

Parameter Comparison

Engineering Selection Recommendations

The VOR2121B8T is the qualified substitute for the obsolete CS334 relay. Both components maintain ROHS3 compliance status and are designed for identical package and circuit configurations. The VOR2121B8T carries active product status with improved moisture sensitivity classification, providing sustained availability for new designs and ongoing production requirements.

For applications where the CS334 was previously specified, the VOR2121B8T supports direct board-level substitution. The enhanced load voltage (250 V) and current (200 mA) capabilities provide design margin beyond the original CS334 specifications, while maintaining input voltage and output type compatibility.

Frequently Asked Questions (FAQ)

Q: Can VOR2121B8T be used as a direct replacement for CS334 in existing designs? A: Yes. Both devices share identical circuit configuration (SPST-NO dual Form A), package geometry (8-SMD, 0.300" / 7.62mm), and termination style (Gull Wing). Electrical parameters are compatible within the VOR2121B8T's extended operating envelope.

Q: What are the key differences between CS334 and VOR2121B8T? A: The VOR2121B8T features higher load voltage rating (250 V vs. 200 V), increased load current (200 mA vs. 180 mA), lower MSL rating (1 vs. 2), and active product status. On-state resistance is 15 Ohms versus 8 Ohms for the CS334.

Q: Are there compliance or regulatory differences between these components? A: Both components are ROHS3 compliant. The CS334 has confirmed REACH Unaffected status; the VOR2121B8T REACH status is Vendor Undefined. Both carry EAR99 ECCN classification.

Q: What moisture sensitivity considerations apply to these relays? A: The CS334 carries MSL 2 (1 Year) rating. The VOR2121B8T carries MSL 1 (Unlimited) rating, providing superior moisture performance characteristics.

Q: Are package considerations identical for PCB layout and assembly? A: Both devices use 8-SMD packages with 0.300" (7.62mm) body dimensions and Gull Wing termination. PCB footprints and reflow profiles remain compatible for direct substitution.

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