C774S Solid State Relay - Equivalent & Substitute Parts

Part Overview

The C774S is a surface-mount solid state relay (SSR) manufactured by Coto Technology, configured as SPST-NO + SPST-NC (1 Form A and B) in an 8-SOP package. This component operates with a 1.37VDC input, supports load voltages from 0V to 400V, and handles up to 80mA load current with a maximum on-state resistance of 30 ohms. The product is classified as obsolete, necessitating identification of equivalent alternatives for new designs or legacy system maintenance.

Substiute Parts

C774S

Coto TechnologyIn Stock: 1223C774S Datasheet

Current PartRFQ

CS774

Coto TechnologyIn Stock: 1028CS774 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The CS774 qualifies as a substitute based on preservation of critical electrical and mechanical parameters. Substitution is valid when the following conditions are met:

Preserved Parameters (Required for Substitution):

• Circuit configuration: SPST-NO + SPST-NC (1 Form A and B)
• Input voltage: 1.37VDC
• Load voltage range: 0V ~ 400V
• Output type: AC, DC
• On-state resistance: 30 Ohms (maximum)
• RoHS3 compliance
• Moisture sensitivity level: 2 (1 Year)
• Series: COTOMOS™
• Termination style: Gull Wing
• Mounting type: Surface Mount

Variable Parameters (Allowing Substitution):

• Load current: CS774 supports 100mA versus C774S's 80mA (upward compatibility)
• Package dimensions: CS774 uses 8-SMD (0.300", 7.62mm) versus C774S's 8-SOP (0.173", 4.40mm)
• Product status: CS774 is Active (versus Obsolete C774S)

Parameter Comparison

Engineering Selection Recommendations

For New Designs: CS774 is the appropriate selection. This part maintains active status with Coto Technology, ensuring continued availability and supply chain support. All critical electrical parameters remain identical to the C774S, with the added advantage of a 25% higher load current capacity (100mA versus 80mA). RoHS3 and MSL compliance align with modern manufacturing standards.

For Legacy System Maintenance: CS774 provides functional equivalence for applications where the C774S is no longer available. The increased load current capability does not compromise existing circuit designs. PCB layout modifications are required to accommodate the larger 8-SMD package footprint (0.300" versus 0.173" width).

Compliance Status: Both components maintain ROHS3 compliance and identical moisture sensitivity levels, supporting deployment in regulated manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can CS774 directly replace C774S in existing PCBs? A: Electrical substitution is valid. However, mechanical layout changes are required due to package size differences. The 8-SMD package (0.300" width) differs from the 8-SOP package (0.173" width). PCB footprint redesign is necessary.

Q: What is the significance of the increased load current rating in CS774? A: The CS774 supports 100mA load current versus the C774S's 80mA. For applications drawing 80mA or less, this represents backward compatibility with margin. Applications exceeding 80mA can be newly designed using CS774.

Q: Are input voltage and load voltage ranges identical? A: Yes. Both parts operate with 1.37VDC input and support 0V to 400V load voltages across AC and DC applications.

Q: How does package size affect circuit design? A: The CS774's larger SMD footprint (0.300", 7.62mm) requires increased board space compared to the C774S (0.173", 4.40mm). This may impact PCB routing and component density. Gull wing termination style is preserved in both parts, maintaining soldering compatibility.

Q: What is the impact of obsolete product status on C774S? A: The obsolete status indicates end-of-production for C774S. CS774, with active status, ensures long-term availability and manufacturing continuity for ongoing production requirements.

Q: Are regulatory certifications equivalent? A: Yes. Both components maintain identical RoHS3 compliance and Moisture Sensitivity Level 2 (1 Year), suitable for equivalent regulatory and environmental deployment contexts.