CS335 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The CS335 is a Solid State SPST-NO (1 Form A) relay in 8-SMD packaging manufactured by Coto Technology. This component is rated for 80 mA load current at 0-80 V DC/AC operation with a 1.37 VDC input requirement. The product is currently marked as obsolete, making identification of suitable substitutes necessary for design continuity and component availability in existing or legacy systems. The part is ROHS3 compliant with MSL 2 (1 Year) rating.

Substiute Parts

CS335

Coto TechnologyIn Stock: 2830CS335 Datasheet

Current PartRFQ

C347S

Coto TechnologyIn Stock: 2230C347S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The C347S is identified as a substitute for the CS335 based on the following electrical and mechanical compatibility parameters:

Matched Parameters:

• Manufacturer: Coto Technology
• Series: COTOMOS™
• Circuit Configuration: SPST-NO (1 Form A) x 2
• Output Type: AC, DC
• Input Voltage: 1.37 VDC
• Load Voltage Range: 0 V - 80 V
• Termination Style: Gull Wing
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• MSL Rating: 2 (1 Year)

Differentiated Parameters:

• Load Current: C347S rated for 1 A (higher than CS335's 80 mA)
• On-State Resistance: C347S 150 mOhms (lower than CS335's 30 Ohms)
• Package Type: C347S uses 8-SOP (0.173", 4.40mm) versus CS335's 8-SMD (0.300", 7.62mm)
• Product Status: C347S is Active (versus CS335's Obsolete status)

Parameter Comparison

Engineering Selection Recommendations

The C347S serves as a direct electrical substitute for the CS335 in applications where the circuit topology and functional requirements remain constant. Both components share identical input voltage, load voltage range, circuit configuration, and compliance certifications (ROHS3, MSL 2). The C347S is the preferred selection for new designs and component replacements due to its active product status, whereas the CS335 is obsolete with limited future availability.

The load current rating of C347S (1 A) exceeds the CS335 specification (80 mA), providing extended capability for applications requiring higher current handling. The lower on-state resistance of C347S (150 mOhms versus 30 Ohms) reduces power dissipation in switching applications. Package geometry differences require PCB layout assessment; the C347S 8-SOP package occupies less board space (4.40mm width) compared to the CS335 8-SMD package (7.62mm width).

Frequently Asked Questions (FAQ)

Q: Can the C347S be used in place of the CS335 in existing designs?

A: The C347S is electrically compatible as a substitute. However, PCB layout modifications are required due to package differences: the CS335 uses 8-SMD (0.300", 7.62mm) while the C347S uses 8-SOP (0.173", 4.40mm) packaging. Both components share identical control voltage (1.37 VDC), load voltage range (0-80 V), circuit configuration (SPST-NO x 2), and termination style (Gull Wing).

Q: What are the load current implications of substituting CS335 with C347S?

A: The C347S is rated for 1 A load current, compared to the CS335's 80 mA specification. This higher rating provides additional design margin. For applications operating at or below 80 mA, the C347S performs identically. Applications requiring current above 80 mA benefit from the increased capacity of C347S.

Q: Are there compliance or regulatory differences between these parts?

A: Both the CS335 and C347S carry identical compliance certifications: ROHS3 compliant, MSL 2 (1 Year) rating, REACH unaffected, and EAR99 ECCN classification. No regulatory barriers exist for substitution from a compliance standpoint.

Q: How does on-state resistance affect component selection?

A: The C347S on-state resistance (150 mOhms) is significantly lower than the CS335 (30 Ohms). Lower on-state resistance reduces power dissipation during switching operation. For low-power applications (≤80 mA), this difference has minimal thermal impact. For higher current applications, the C347S efficiency advantage becomes more pronounced.

Q: What is the package footprint difference between these parts?

A: The CS335 uses 8-SMD packaging with 0.300" (7.62mm) body width. The C347S uses 8-SOP packaging with 0.173" (4.40mm) body width. The C347S provides a more compact footprint suitable for space-constrained designs. PCB layout and solder reflow parameters must be verified for the specific package geometry during implementation.