LCA125L Solid State Relay - Equivalent & Substitute Parts

Part Overview

The LCA125L is an IXYS OptoMOS® solid state relay (SSR) configured as a single-pole, single-throw normally open (SPST-NO) switch. This 6-DIP through-hole component operates with DC and AC loads up to 350V and 170mA, making it suitable for industrial control, switching, and relay replacement applications. The part is active and in production, with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific requirements.

Substiute Parts

LCA125L

IXYS Integrated Circuits DivisionIn Stock: 20153LCA125L Datasheet

Current PartRFQ

AQV210HL

Panasonic Electric WorksIn Stock: 1629AQV210HL Datasheet

MFR RecommendedRFQ

LH1500AT

Vishay Semiconductor Opto DivisionIn Stock: 8757LH1500AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LCA125L are qualified based on the following electrical and mechanical criteria:

Critical Matching Parameters:

• Circuit configuration: SPST-NO (1 Form A)
• Package / Case: 6-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Termination style: PC Pin
• Load voltage range: 0 V ~ 350 V
• Output type: AC, DC capable
• Input voltage: 1.14VDC to 1.25VDC (compatible control signal range)

Allowable Variation Parameters:

• Load current: 130 mA to 170 mA (all substitutes meet or exceed minimum switching requirements)
• On-state resistance: 20 Ohms to 25 Ohms (within acceptable conduction loss specifications)

Both identified substitutes—AQV210HL (Panasonic PhotoMOS™ AQV series) and LH1500AT (Vishay LH1500 series)—meet all critical matching parameters and operate within allowable variation ranges. All three parts share identical package geometry, pinout compatibility, and load voltage specifications, enabling direct substitution in through-hole PCB applications.

Parameter Comparison

Engineering Selection Recommendations

LCA125L (Primary Part): IXYS OptoMOS® LCA125L is the specified component with ROHS3 compliance, unlimited MSL rating, and 170mA load current capacity. Recommended for new designs and applications requiring maximum current handling within the 6-DIP package class.

AQV210HL (Panasonic Substitute): PhotoMOS™ AQV210HL provides equivalent switching performance with 130mA load current and 1.14VDC input voltage. RoHS compliant with Not Applicable MSL designation. Suitable for applications where load current does not exceed 130mA and inventory availability of the primary part is constrained.

LH1500AT (Vishay Substitute): Vishay LH1500AT delivers 150mA load current with 1.25VDC input voltage and 20 Ohms on-state resistance, matching the primary part's conduction characteristics. ROHS3 compliant with unlimited MSL rating. Recommended as the preferred substitute when LCA125L availability is limited, due to equivalent electrical performance and compliance profile.

All three parts are active products with established supply chains and industrial certifications (cUR, DIN, FIMKO, UL for LH1500AT). Selection between substitutes depends on load current requirements and inventory status.

Frequently Asked Questions (FAQ)

Q: Can AQV210HL replace LCA125L in all applications? A: AQV210HL is mechanically and electrically compatible for applications where load current does not exceed 130mA. If the application requires the full 170mA switching capacity of LCA125L, AQV210HL is not suitable. Verify load current specifications before substitution.

Q: What is the difference in on-state resistance between these parts? A: LCA125L and LH1500AT both specify 20 Ohms maximum on-state resistance. AQV210HL specifies 25 Ohms maximum. This 5 Ohm difference results in slightly higher conduction losses in the AQV210HL but remains within acceptable operating parameters for most industrial switching applications.

Q: Are all three parts pin-compatible? A: Yes. All three parts use identical 6-DIP (0.300", 7.62mm) package geometry with PC pin termination, enabling direct PCB substitution without layout modifications.

Q: What input voltage is required to operate these relays? A: LCA125L requires 1.2VDC, AQV210HL requires 1.14VDC, and LH1500AT requires 1.25VDC. All three operate within a narrow control voltage range suitable for standard logic-level gate drive circuits. Verify control circuit output voltage compatibility before substitution.

Q: Do these parts have different moisture sensitivity requirements? A: LCA125L and LH1500AT both carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. AQV210HL carries Not Applicable MSL designation. All three parts are suitable for standard PCB assembly and storage conditions without special moisture control measures.

Q: What load voltage range do these relays support? A: All three parts support identical load voltage range of 0 V to 350 V for both AC and DC loads, enabling direct substitution across the full operating voltage spectrum.