LCA100STR Equivalent & Substitute Parts

Part Overview

The LCA100STR 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) relay with a maximum load current of 120 mA and load voltage range of 0 V to 350 V. The device is surface-mounted in a 6-SMD package with gull wing termination and is classified as an active product with ROHS3 compliance. Equivalent parts may be required due to supply constraints, manufacturing discontinuation, or design optimization needs while maintaining identical electrical and mechanical specifications.

Substiute Parts

LCA100STR

IXYS Integrated Circuits DivisionIn Stock: 2187LCA100STR Datasheet

Current PartRFQ

LH1540AABTR

Vishay Semiconductor Opto DivisionIn Stock: 18678LH1540AABTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LCA100STR is permissible with parts that maintain identical electrical and mechanical specifications across the following critical parameters:

• Circuit configuration: SPST-NO (1 Form A)
• Load voltage range: 0 V ~ 350 V
• Load current capacity: 120 mA minimum
• Package type: 6-SMD (0.300", 7.62mm)
• Termination style: Gull Wing
• Mounting type: Surface Mount
• Output capability: AC and DC switching

The LH1540AABTR from Vishay Semiconductor Opto Division qualifies as a direct substitute based on these parameters. Both devices share identical load voltage specifications, load current ratings, package dimensions, and termination characteristics. Variations in input voltage (1.26 VDC vs. 1.2 VDC) and on-state resistance (20 Ohms vs. 25 Ohms) represent improvements in the substitute part and do not prevent interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both the LCA100STR and LH1540AABTR are active products with full ROHS3 compliance and REACH unaffected status, making either suitable for new designs and existing applications. The LH1540AABTR carries additional approval certifications (cUL, DIN, FIMKO, UL) and demonstrates lower on-state resistance (20 Ohms vs. 25 Ohms), which may provide marginal thermal advantages in high-frequency switching applications. Selection between these parts should be based on supply availability, cost considerations, and any design-specific certification requirements. Both devices are electrically and mechanically interchangeable within the specified load voltage and current parameters.

Frequently Asked Questions (FAQ)

Q: Can the LH1540AABTR replace the LCA100STR in existing designs?

A: Yes. Both parts share identical load voltage (0 V ~ 350 V), load current (120 mA), package dimensions (6-SMD, 0.300" / 7.62mm), and termination style (Gull Wing). The LH1540AABTR input voltage (1.26 VDC) is compatible with the LCA100STR specification (1.2 VDC), and the lower on-state resistance does not create compatibility issues.

Q: What are the key electrical parameters that determine substitution eligibility?

A: Load voltage range, load current capacity, circuit configuration (SPST-NO), and output type (AC/DC capability) are the primary electrical criteria. Both parts meet these specifications identically.

Q: Are there packaging differences between these parts?

A: No. Both devices use the same 6-SMD package with 0.300" (7.62mm) body dimensions and gull wing termination. They are mechanically interchangeable on standard PCB layouts.

Q: Do compliance and certification differences affect substitution?

A: Both parts are ROHS3 compliant and REACH unaffected. The LH1540AABTR carries additional agency approvals (cUL, DIN, FIMKO, UL), which may be beneficial for applications requiring specific regional certifications but do not prevent substitution in applications requiring only basic compliance.

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

A: The LCA100STR has a maximum on-state resistance of 25 Ohms, while the LH1540AABTR is rated at 20 Ohms. This 5-Ohm difference results in lower power dissipation with the Vishay part and does not create compatibility concerns.