C345S Solid State Relay - Equivalent & Substitute Parts

Part Overview

The Coto Technology C345S is a Solid State SPST-NO (1 Form A) relay in an 8-SOP surface mount package. This component is classified as obsolete product status. Finding equivalent and substitute parts is necessary to ensure design continuity, support alternative sourcing channels, and maintain circuit functionality where the original part is no longer available through standard distribution channels.

Substiute Parts

C345S

Coto TechnologyIn Stock: 1572C345S Datasheet

Current PartRFQ

C347S

Coto TechnologyIn Stock: 2230C347S Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the C345S is evaluated based on the following critical parameters that define electrical and mechanical compatibility:

Mechanical Compatibility Parameters:

• Package / Case: 8-SOP (0.173", 4.40mm Width)
• Mounting Type: Surface Mount
• Termination Style: Gull Wing

Electrical Compatibility Parameters:

• Circuit Configuration: SPST-NO (1 Form A) x 2
• Input Voltage: 1.37VDC
• Output Type: AC, DC capable
• Load Voltage Range: Must accommodate 0 V ~ 60 V minimum
• Load Current: Must accommodate 100 mA minimum
• On-State Resistance: Impact on circuit performance and heat dissipation

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 2 (1 Year)
• REACH Status: REACH Unaffected

The C347S qualifies as a substitute part because it maintains identical mechanical packaging, circuit configuration, input voltage, output type capability, and compliance certifications while providing enhanced electrical performance specifications (higher load voltage and current capacity, lower on-state resistance).

Parameter Comparison

Engineering Selection Recommendations

For C345S Replacement Applications:

The C347S is the direct substitute for the obsolete C345S. Both parts maintain identical mechanical packaging (8-SOP gull wing), circuit topology (dual SPST-NO), input voltage specification (1.37VDC), and environmental compliance certifications (ROHS3, REACH Unaffected, MSL 2).

The C347S carries active product status, ensuring long-term availability and supply chain continuity. Electrical performance enhancements in the C347S (20V higher load voltage rating, 10x higher current capability, 98.9% reduction in on-state resistance) provide design margin beyond C345S specifications.

Both parts are ROHS3 compliant with identical moisture sensitivity ratings, supporting seamless integration into existing assembly processes and reflow profiles.

Frequently Asked Questions (FAQ)

Q: Can the C347S directly replace the C345S in existing designs? A: Yes. The C347S is mechanically and electrically compatible with the C345S. Both components share the same 8-SOP gull wing package, dual SPST-NO circuit configuration, 1.37VDC input voltage, and AC/DC output capability. The C347S accommodates all original C345S electrical requirements with enhanced performance margins.

Q: What is the difference in electrical performance between C345S and C347S? A: The C347S provides higher load voltage capability (80V vs. 60V), higher load current capacity (1A vs. 100mA), and significantly lower on-state resistance (150mΩ vs. 14Ω). These enhancements provide design margin while maintaining input voltage and circuit topology compatibility.

Q: Are there packaging or mounting differences? A: No. Both components use the identical 8-SOP (0.173", 4.40mm) package with gull wing termination style and surface mount mounting type. PCB layout, footprint, and reflow parameters remain unchanged.

Q: How do I verify compatibility for my specific application? A: Confirm that your circuit operates within the C347S load voltage range (0V ~ 80V), load current requirement (maximum 1A), and input control voltage (1.37VDC). The C347S is compatible with any design where the C345S was specified, including designs operating at lower electrical loads.

Q: What is the inventory status for these parts? A: The C345S is obsolete with limited remaining inventory (1507 pcs). The C347S carries active product status with established availability (2206 pcs confirmed in stock), ensuring reliable long-term sourcing.

Q: Are compliance certifications identical? A: Yes. Both C345S and C347S are ROHS3 compliant, REACH Unaffected, and carry identical Moisture Sensitivity Level (MSL 2, 1 Year) classifications.