LCA100S Solid State Relay - Equivalent & Substitute Parts

Part Overview

The LCA100S is an optically isolated solid state relay (SSR) manufactured by IXYS Integrated Circuits Division, part of the OptoMOS® product line. This SPST-NO (Single Pole Single Throw - Normally Open) relay is designed for AC and DC load switching applications with a maximum load voltage of 350V and 120mA load current capacity. The device is housed in a 6-SMD surface mount package with gull wing termination style.

The LCA100S maintains Active product status and is ROHS3 compliant. Equivalent and substitute parts may be required due to inventory constraints, supply chain considerations, or specific application requirements where alternative electrical characteristics provide functional compatibility.

Substiute Parts

LCA100S

IXYS Integrated Circuits DivisionIn Stock: 1934LCA100S Datasheet

Current PartRFQ

AQV210EHA

Panasonic Electric WorksIn Stock: 1523AQV210EHA Datasheet

MFR RecommendedRFQ

LH1540AAB

Vishay Semiconductor Opto DivisionIn Stock: 3432LH1540AAB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LCA100S is determined by strict alignment of the following critical parameters:

• Circuit configuration: SPST-NO (1 Form A) topology
• Package type: 6-SMD (0.300", 7.62mm) with gull wing termination
• Load voltage range: 0V ~ 350V maximum
• Output type: AC and DC switching capability
• Mounting method: Surface mount
• Load current capacity: minimum 120mA
• Input voltage: compatible with 1.2VDC control signal
• On-state resistance: electrical performance within acceptable range
• Compliance: ROHS3 and REACH requirements

The substitute parts identified—AQV210EHA (Panasonic Electric Works, PhotoMOS™ AQV series) and LH1540AAB (Vishay Semiconductor Opto Division, LH1540 series)—meet all mandatory substitution criteria. Both devices share identical package geometry, circuit topology, load voltage specifications, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

All three devices—LCA100S, AQV210EHA, and LH1540AAB—maintain Active product status and satisfy ROHS3 and REACH compliance requirements. Selection between these parts should be based on the following factors derived from provided specifications:

LCA100S (Primary Part): Baseline reference with 25 Ohms maximum on-state resistance and 1.2VDC input voltage requirement. Moisture Sensitivity Level 1 (Unlimited) indicates robust handling characteristics.

AQV210EHA (Panasonic Substitute): Offers 130mA load current capacity, exceeding the 120mA requirement. Input voltage of 1.14VDC is lower than the primary part. On-state resistance of 35 Ohms is higher. Moisture Sensitivity Level is Not Applicable, indicating different packaging construction. This part provides increased current headroom for applications requiring higher load capacity.

LH1540AAB (Vishay Substitute): Matches the 120mA load current specification exactly. Input voltage of 1.26VDC is marginally higher than the primary part. On-state resistance of 20 Ohms is lower, providing superior electrical efficiency. Moisture Sensitivity Level 1 (Unlimited) matches the primary part. This part offers improved on-state performance characteristics.

All three parts share identical package geometry, circuit topology, and maximum load voltage rating, ensuring direct PCB compatibility and functional interchangeability within the specified electrical operating range.

Frequently Asked Questions (FAQ)

Q: Can AQV210EHA be used as a direct replacement for LCA100S?

A: Yes. Both devices share identical package geometry (6-SMD, 0.300", 7.62mm), circuit configuration (SPST-NO), load voltage range (0V ~ 350V), and compliance certifications (ROHS3, REACH). The AQV210EHA provides higher load current capacity (130mA vs. 120mA) and operates at a lower input voltage (1.14VDC vs. 1.2VDC). On-state resistance is higher at 35 Ohms compared to 25 Ohms.

Q: Can LH1540AAB be used as a direct replacement for LCA100S?

A: Yes. Both devices share identical package geometry (6-SMD, 0.300", 7.62mm), circuit configuration (SPST-NO), load voltage range (0V ~ 350V), and compliance certifications (ROHS3, REACH). The LH1540AAB matches the 120mA load current specification and operates at a marginally higher input voltage (1.26VDC vs. 1.2VDC). On-state resistance is lower at 20 Ohms, providing improved electrical efficiency.

Q: Are there differences in moisture sensitivity between these parts?

A: The LCA100S and LH1540AAB both specify Moisture Sensitivity Level 1 (Unlimited), indicating identical handling and storage requirements. The AQV210EHA specifies Moisture Sensitivity Level as Not Applicable, indicating different packaging construction that may have different environmental handling considerations.

Q: Do all three parts support both AC and DC load switching?

A: Yes. All three devices—LCA100S, AQV210EHA, and LH1540AAB—support both AC and DC output types across the 0V ~ 350V load voltage range.

Q: What is the significance of on-state resistance differences?

A: On-state resistance affects power dissipation and voltage drop across the relay during conduction. The LH1540AAB (20 Ohms) provides the lowest resistance and highest efficiency. The LCA100S (25 Ohms) is the baseline reference. The AQV210EHA (35 Ohms) has the highest resistance and will dissipate more power during operation. Selection should consider thermal management requirements and power budget constraints of the application.

Q: Are all parts available in the same packaging format?

A: Yes. All three devices use 6-SMD (0.300", 7.62mm) surface mount packages with gull wing termination style, ensuring identical PCB footprint and reflow soldering compatibility.

Q: Do these parts have the same input voltage requirements?

A: The input voltages are similar but not identical. LCA100S requires 1.2VDC, AQV210EHA requires 1.14VDC, and LH1540AAB requires 1.26VDC. All three values are within typical control signal ranges and should be compatible with standard logic-level gate drive circuits.