LCA127L Solid State Relay - Equivalent & Substitute Parts

Part Overview

The LCA127L is an optically isolated solid state relay (SSR) manufactured by IXYS Integrated Circuits Division. It functions as a SPST-NO (Single Pole Single Throw - Normally Open) switch with 1 Form A configuration, designed for AC and DC load switching applications. The device operates with a 1.2VDC input signal and supports load voltages from 0V to 250V at a maximum load current of 170mA. The LCA127L is currently in active production status and is RoHS3 compliant. Equivalent substitute parts are identified when they maintain compatible electrical specifications and identical mechanical packaging, enabling direct replacement in existing circuit designs.

Substiute Parts

LCA127L

IXYS Integrated Circuits DivisionIn Stock: 1519LCA127L Datasheet

Current PartRFQ

LH1510AT

Vishay Semiconductor Opto DivisionIn Stock: 2122LH1510AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LCA127L are qualified based on the following critical parameters that determine functional compatibility:

Mechanical Compatibility:

• Identical package type: 6-DIP (0.300", 7.62mm)
• Identical mounting type: Through Hole
• Identical termination style: PC Pin

Electrical Compatibility:

• Circuit configuration: SPST-NO (1 Form A)
• Output type capability: AC and DC switching
• Input voltage: Within acceptable operating range (1.2VDC to 1.27VDC)
• Load voltage range: Must support the required application voltage
• Load current capacity: Must meet or exceed application requirements
• On-state resistance: Maximum 15 Ohms

Regulatory Compliance:

• RoHS3 compliance status
• Active product status

The LH1510AT from Vishay Semiconductor Opto Division qualifies as a direct substitute based on these parameters.

Parameter Comparison

Engineering Selection Recommendations

The LH1510AT is a qualified substitute for the LCA127L in applications where the load voltage requirement does not exceed 200V. Both devices share identical mechanical packaging, circuit configuration, and regulatory compliance status. The LH1510AT provides higher load current capacity (200mA versus 170mA) and marginally higher input voltage specification (1.27VDC versus 1.2VDC), making it suitable for equivalent or less demanding applications.

For applications requiring load voltages above 200V, the LCA127L must be retained as it supports the full 0V to 250V range. The selection between these parts is determined solely by the maximum load voltage requirement of the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can the LH1510AT replace the LCA127L in all applications?

A: The LH1510AT is a direct substitute only for applications where the maximum load voltage does not exceed 200V. The LCA127L supports load voltages up to 250V. If your application requires operation above 200V, the LCA127L must be used.

Q: Are the packages physically identical?

A: Yes. Both the LCA127L and LH1510AT use the 6-DIP (0.300", 7.62mm) package with PC Pin termination and Through Hole mounting. They are mechanically interchangeable on PCBs designed for either part.

Q: What is the difference in load current capacity?

A: The LH1510AT supports 200mA maximum load current, while the LCA127L supports 170mA. The LH1510AT can handle higher current loads. If your application requires only 170mA or less, both parts are functionally equivalent.

Q: Are both parts RoHS compliant?

A: Yes. Both the LCA127L and LH1510AT are ROHS3 compliant and carry MSL Rating 1 (Unlimited moisture sensitivity level).

Q: What is the input voltage difference between these parts?

A: The LCA127L operates at 1.2VDC input, while the LH1510AT operates at 1.27VDC input. This minor difference is within typical circuit tolerance and does not affect practical substitution compatibility.