CT136HT Solid State Relay SPST-NO Equivalent & Substitute Parts

Part Overview

The CT136HT is a solid state relay (SSR) manufactured by Coto Technology, configured as a single-pole single-throw normally open (SPST-NO) device rated for 2.5A load current across 0–60V AC/DC output. The device is packaged in a 6-DIP (0.300", 7.62mm) through-hole format with PC pin termination.

The CT136HT is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing maintenance, repair, and new design requirements where this part is specified or where existing inventory requires replenishment from alternative sources.

Substiute Parts

CT136HT

Coto TechnologyIn Stock: 883CT136HT Datasheet

Current PartRFQ

AA36

Bright Toward Industrial Co., Ltd.In Stock: 2131AA36 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CT136HT is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A)
• Load Voltage Range: Must support 0 V – 60 V
• Load Current Rating: Must be rated for 2.5 A minimum
• Input Voltage: Must operate at 1.37 VDC
• Output Type: Must support both AC and DC loads
• Package / Case: Must be 6-DIP (0.300", 7.62mm)
• Mounting Type: Must be through-hole compatible
• Termination Style: Must use PC pin termination

The AA36 manufactured by Bright Toward Industrial Co., Ltd. meets all of these substitution criteria. Both devices share identical electrical specifications for load voltage, load current, input voltage, output type, and package geometry. The AA36 is classified as active product status, ensuring ongoing availability and support.

Parameter Comparison

Engineering Selection Recommendations

The AA36 is a direct functional equivalent to the CT136HT for all specified electrical and mechanical parameters. Selection of the AA36 as a substitute is supported by the following factors:

• Electrical Equivalence: All critical load and input voltage specifications are identical. The AA36 exhibits lower on-state resistance (100 mOhms versus 140 mOhms), which represents an improvement in switching performance and thermal efficiency.

• Package Compatibility: Both devices use identical 6-DIP (0.300", 7.62mm) through-hole packaging with PC pin termination, ensuring direct board-level compatibility without layout modification.

• Regulatory Compliance: Both devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

• Product Status and Availability: The AA36 is classified as active product status, ensuring long-term availability and supply chain continuity. The CT136HT is obsolete, making the AA36 the appropriate choice for new designs and ongoing production support.

• Moisture Sensitivity: The AA36 carries MSL 1 (unlimited shelf life) compared to the CT136HT's MSL 2 (1 year), providing superior storage stability and reduced risk of moisture-related failures.

Frequently Asked Questions (FAQ)

Q: Can the AA36 be used as a direct replacement for the CT136HT in existing designs?

A: Yes. The AA36 meets all electrical and mechanical specifications of the CT136HT. Both devices are SPST-NO solid state relays with identical load voltage (0–60V), load current (2.5A), input voltage (1.37VDC), and 6-DIP package geometry. No circuit modification or board redesign is required.

Q: What is the significance of the lower on-state resistance in the AA36?

A: The AA36 exhibits 100 mOhms maximum on-state resistance compared to the CT136HT's 140 mOhms. Lower on-state resistance reduces voltage drop across the relay during conduction, resulting in lower power dissipation and improved thermal performance. This represents a performance enhancement over the original specification.

Q: Are there any compliance or certification differences between these parts?

A: Both the CT136HT and AA36 are ROHS3 compliant and REACH unaffected. No compliance barriers exist to substitution. The AA36 carries superior moisture sensitivity rating (MSL 1 versus MSL 2), indicating better long-term storage characteristics.

Q: Why is the CT136HT classified as obsolete?

A: The CT136HT is no longer manufactured by Coto Technology. The AA36 is the recommended substitute for applications requiring this functional specification and package format.

Q: Is the 6-DIP package geometry identical between both parts?

A: Yes. Both devices use 6-DIP (0.300", 7.62mm) through-hole packaging with PC pin termination. Pin spacing, lead diameter, and board footprint are identical, ensuring direct compatibility without modification.

Q: Can the AA36 handle both AC and DC loads like the CT136HT?

A: Yes. Both devices are rated for AC and DC output operation across the 0–60V load voltage range at 2.5A maximum current.