LCA129 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The LCA129 is an active SPST-NO (Single Pole Single Throw - Normally Open) solid state relay manufactured by IXYS Integrated Circuits Division. This OptoMOS® series component operates as a 1 Form A relay with AC/DC output capability, designed for through-hole mounting in 6-DIP packaging. The device switches loads up to 250V at 170mA with a 1.2VDC input trigger voltage. As an active product with ROHS3 compliance and unlimited moisture sensitivity rating, equivalent parts may be required for inventory optimization, regional availability, or specific application requirements.

Substiute Parts

LCA129

IXYS Integrated Circuits DivisionIn Stock: 1018LCA129 Datasheet

Current PartRFQ

LH1510AT

Vishay Semiconductor Opto DivisionIn Stock: 2122LH1510AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LCA129 is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Package / Case: Must be 6-DIP (0.300", 7.62mm) for PCB footprint compatibility
• Mounting Type: Must be Through Hole to match assembly requirements
• Termination Style: Must be PC Pin for solder connection compatibility
• Output Type: Must support AC and DC switching capability
• Input Voltage: Must be compatible with 1.2VDC trigger level
• Load Voltage Range: Must accommodate 0V ~ 250V operation
• Load Current: Must support minimum 170mA switching capacity
• Compliance: Must maintain ROHS3 compliance and MSL 1 rating

The LH1510AT from Vishay Semiconductor Opto Division meets all substitution criteria within the allowed parameter tolerance range.

Parameter Comparison

Engineering Selection Recommendations

Both the LCA129 and LH1510AT are active products with ROHS3 compliance and identical moisture sensitivity ratings. The LH1510AT provides equivalent or superior electrical performance within the specified parameter range. Selection between these parts should be based on application load voltage requirements: the LCA129 supports loads up to 250V, while the LH1510AT is rated to 200V maximum. For applications requiring operation above 200V, the LCA129 is the required selection. For applications operating at or below 200V, the LH1510AT is a direct substitute with improved on-state resistance characteristics and higher current capacity.

Frequently Asked Questions (FAQ)

Q: Can the LH1510AT replace the LCA129 in all applications?

A: The LH1510AT is a direct substitute for applications where the load voltage does not exceed 200V. The LCA129 must be used for applications requiring operation between 200V and 250V.

Q: Are the package dimensions identical between these parts?

A: Yes. Both parts use 6-DIP (0.300", 7.62mm) packaging with PC Pin termination, ensuring identical PCB footprint and through-hole mounting compatibility.

Q: What is the difference in on-state resistance between these parts?

A: The LCA129 has a maximum on-state resistance of 20 Ohms, while the LH1510AT is rated at 15 Ohms maximum. Lower on-state resistance reduces power dissipation during switching.

Q: Are both parts RoHS compliant?

A: Yes. Both the LCA129 and LH1510AT are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

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

A: The LCA129 requires 1.2VDC input, while the LH1510AT requires 1.27VDC input. Both are compatible with standard logic-level control circuits.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes, provided the application load voltage does not exceed 200V. The identical 6-DIP package and PC Pin termination ensure direct PCB compatibility.