CT135 Solid State Relay SPST-NO

Part Overview

The CT135 is a solid-state relay (SSR) manufactured by Coto Technology, configured as a single-pole single-throw normally-open (SPST-NO) device in a 6-DIP through-hole package. This component switches AC and DC loads up to 100 mA across a 0–80 V range with a 1.37 VDC input signal. The CT135 is classified as obsolete, necessitating identification of compatible alternative components for new designs and system replacements.

Substiute Parts

CT135

Coto TechnologyIn Stock: 2678CT135 Datasheet

Current PartRFQ

CT130

Coto TechnologyIn Stock: 855CT130 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CT135 is determined by conformance to the following critical electrical and mechanical parameters:

Electrical Compatibility: The substitute must maintain the same circuit topology (SPST-NO), input voltage (1.37 VDC), on-state resistance (30 Ohms maximum), and output capability for both AC and DC loads. Load current and voltage ratings must equal or exceed the original specifications (100 mA at 0–80 V minimum).

Mechanical Compatibility: The substitute must use identical or pin-compatible packaging (6-DIP, 0.300" spacing, 7.62mm pitch) with through-hole termination to ensure direct board-level replacement without redesign.

Regulatory Compliance: Substitutes must maintain ROHS3 compliance and equivalent moisture sensitivity ratings to ensure compatibility with existing qualification and manufacturing processes.

Parameter Comparison

Engineering Selection Recommendations

The CT130 is a qualified substitute for CT135 applications. Both devices share identical electrical input requirements, circuit topology, on-state resistance, and mechanical packaging. The CT130 carries active product status from Coto Technology, ensuring continued supply and manufacturing support. Enhanced load voltage (0–400 V versus 0–80 V) and current capacity (120 mA versus 100 mA) provide design margin for applications within the CT135's original voltage and current envelope. Both components maintain ROHS3 compliance and identical moisture sensitivity specifications.

Frequently Asked Questions (FAQ)

Q: Can the CT130 directly replace the CT135 in existing designs? A: Yes. Both devices use identical 6-DIP through-hole packaging, input voltage requirements (1.37 VDC), and circuit topology (SPST-NO). No board-level redesign or component repositioning is required.

Q: Are the electrical characteristics of the CT130 compatible with CT135 circuit designs? A: Yes. The CT130 meets all CT135 specifications with enhanced load voltage and current ratings. On-state resistance (30 Ohms maximum) and input drive requirements remain identical.

Q: Why does the CT130 have a higher voltage rating than the CT135? A: The CT130 supports 0–400 V load voltage compared to the CT135's 0–80 V range. This difference is a manufacturing design characteristic of the devices; designs rated for 80 V loads are unaffected by this enhanced rating.

Q: Are there packaging differences between the CT135 and CT130? A: No. Both components use 6-DIP (0.300", 7.62mm) through-hole packaging with identical pin assignments and mechanical dimensions.

Q: Do both parts meet the same regulatory standards? A: Yes. Both CT135 and CT130 are ROHS3 compliant with equivalent moisture sensitivity levels (MSL 2, 1 Year).