CT330 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The CT330 is a solid-state SPST-NO (1 Form A) relay manufactured by Coto Technology, designed for switching applications requiring low control voltage and AC/DC load switching up to 400V at 100mA. This component operates as a dual-channel relay in an 8-DIP package with PC pin termination for through-hole mounting.

The CT330 has reached obsolete product status. Identification of qualified substitute parts is necessary to maintain design continuity and ensure availability for new production builds and field replacements.

Substiute Parts

CT330

Coto TechnologyIn Stock: 1314CT330 Datasheet

Current PartRFQ

VOR2142A8

Vishay Semiconductor Opto DivisionIn Stock: 2963VOR2142A8 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CT330 is permissible with parts meeting the following critical parameter requirements:

• Circuit Configuration: SPST-NO (1 Form A) x 2 (dual-channel relay architecture)
• Package / Case: 8-DIP (0.300", 7.62mm) (physical and electrical compatibility)
• Input Voltage: 1.3 - 1.4 VDC (control signal compatibility)
• Load Voltage Range: 0 - 400 V (maximum switching capability)
• Load Current: ≥ 100 mA (minimum current-handling requirement)
• On-State Resistance: ≤ 30 Ohms (maximum conduction loss)
• Termination Style: PC Pin (board-level connection compatibility)
• Output Type: AC, DC (load type flexibility)
• Mounting Type: Through Hole (assembly method compatibility)

The VOR2142A8 from Vishay Semiconductor Opto Division satisfies all substitution criteria within the allowed parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

The VOR2142A8 is an active-status product manufactured by Vishay Semiconductor Opto Division and is recommended as a direct substitute for the obsolete CT330. Both components are ROHS3 compliant and meet all electrical, mechanical, and environmental requirements for interchangeability.

The VOR2142A8 offers enhanced performance characteristics: improved current capacity (140 mA vs. 100 mA), lower on-state resistance (27 Ohms vs. 30 Ohms), and superior moisture sensitivity rating (MSL 1 vs. MSL 2). These performance improvements provide design margin without requiring circuit modifications.

Frequently Asked Questions (FAQ)

Q: Can the VOR2142A8 replace the CT330 in existing designs? A: Yes. Both parts meet identical package, circuit configuration, input voltage, and load voltage specifications. The 8-DIP through-hole package, PC pin termination, and dual SPST-NO channel architecture are fully interchangeable.

Q: What is the significance of the load current difference (100 mA vs. 140 mA)? A: The VOR2142A8 has higher current capacity, making it suitable for all applications where the CT330 is used. Design circuits rated for 100 mA will operate within safe margins on the VOR2142A8.

Q: Are there compliance differences between these parts? A: Both parts are ROHS3 compliant and REACH unaffected. The VOR2142A8 has a superior moisture sensitivity rating (MSL 1, unlimited shelf life vs. MSL 2, 1-year shelf life), providing better long-term storage characteristics.

Q: Does the on-state resistance difference affect circuit behavior? A: The VOR2142A8 has lower on-state resistance (27 Ohms vs. 30 Ohms), resulting in slightly lower conduction losses and reduced heat generation. This represents an improvement over the original design.

Q: Are input voltage specifications compatible? A: Yes. Both parts operate at control voltages of approximately 1.36-1.37 VDC, ensuring direct compatibility with existing control signal sources.

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