LCA120 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The LCA120 is an optically isolated solid state relay (SSR) manufactured by IXYS Integrated Circuits Division, operating as a SPST-NO (Single Pole Single Throw - Normally Open) switch. This 6-DIP through-hole component is designed for AC and DC load switching applications with a maximum load voltage of 0–250V and load current capacity of 170 mA. The device is Active in product status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching circuit topology, package form factor, and electrical operating parameters within acceptable tolerance ranges.

Substiute Parts

LCA120

IXYS Integrated Circuits DivisionIn Stock: 1835LCA120 Datasheet

Current PartRFQ

AQV253H

Panasonic Electric WorksIn Stock: 3385AQV253H Datasheet

MFR RecommendedRFQ

LH1510AT

Vishay Semiconductor Opto DivisionIn Stock: 2122LH1510AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LCA120 is determined by the following criteria:

• Circuit Configuration: Must be SPST-NO (1 Form A) topology
• Package Form Factor: Must be 6-DIP (0.300", 7.62mm) with PC Pin termination for direct PCB compatibility
• Mounting Type: Must be Through Hole
• Load Voltage Range: Must support 0–250V operation or higher
• Load Current: Must support minimum 170 mA; higher ratings are acceptable
• Input Voltage: Must operate at or below 1.2 VDC nominal input
• Output Type: Must support both AC and DC loads
• Compliance: RoHS3 compliance preferred for regulatory alignment

The identified substitute parts meet these criteria and are functionally interchangeable within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

AQV253H (Panasonic Electric Works)

The AQV253H is a direct functional substitute for the LCA120. It operates within compatible input voltage specifications (1.14 VDC vs. 1.2 VDC) and supports the full 0–250V load voltage range. The load current rating of 200 mA exceeds the LCA120 requirement of 170 mA. The lower on-state resistance (8 Ohms vs. 20 Ohms) results in reduced power dissipation. The device is RoHS compliant and maintains the identical 6-DIP package footprint. This part is suitable for direct replacement in applications where the enhanced current capacity and lower resistance are beneficial or neutral.

LH1510AT (Vishay Semiconductor Opto Division)

The LH1510AT is functionally compatible with the LCA120 in most applications. Input voltage specification (1.27 VDC) is within acceptable tolerance of the LCA120 (1.2 VDC). Load current rating of 200 mA exceeds the 170 mA requirement. The maximum load voltage is 200V, which is 50V lower than the LCA120 specification. This limitation must be evaluated against application requirements. On-state resistance is 15 Ohms, intermediate between the LCA120 and AQV253H. The device is ROHS3 compliant and maintains identical package and termination specifications. Selection of this part is appropriate for applications with load voltages not exceeding 200V.

Frequently Asked Questions (FAQ)

Q: Can the AQV253H replace the LCA120 in all applications?

A: The AQV253H meets or exceeds all electrical parameters of the LCA120 and maintains identical package specifications. It is suitable for direct replacement. The lower on-state resistance may reduce heat generation in the application.

Q: What is the key limitation of the LH1510AT as a substitute?

A: The LH1510AT has a maximum load voltage rating of 200V, compared to the LCA120 specification of 250V. Applications requiring load voltages above 200V must use the LCA120 or AQV253H.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 6-DIP (0.300", 7.62mm) package with PC Pin termination and identical SPST-NO circuit topology, ensuring direct PCB compatibility without layout modification.

Q: Do input voltage differences affect substitution?

A: Input voltage specifications for all three parts (1.2 VDC, 1.14 VDC, and 1.27 VDC) are within typical design tolerances for control circuits. Substitution is acceptable from an input voltage perspective.

Q: Which substitute offers the best performance characteristics?

A: The AQV253H provides the lowest on-state resistance (8 Ohms) and highest load current rating (200 mA) while maintaining the full 250V load voltage range. Selection depends on specific application requirements for power dissipation, current capacity, and voltage headroom.

Q: Are there compliance or regulatory differences between the parts?

A: The LCA120 and LH1510AT are ROHS3 compliant. The AQV253H is RoHS compliant. All three parts carry EAR99 ECCN classification and are REACH unaffected or compliant, suitable for equivalent regulatory environments.