LH1525ACD Equivalent & Substitute Parts

Part Overview

The LH1525ACD is a solid-state relay (SSR) manufactured by Vishay Semiconductor Opto Division, configured as a SPST-NO (Single Pole Single Throw - Normally Open) switch. This component is designed for AC and DC load switching applications with a maximum load voltage of 0–400V and load current capacity of 270mA. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LH1525ACD

Vishay Semiconductor Opto DivisionIn Stock: 1890LH1525ACD Datasheet

Current PartRFQ

LH1525AAB

Vishay Semiconductor Opto DivisionIn Stock: 5308LH1525AAB Datasheet

MFR RecommendedRFQ

AQY210LS

Panasonic Electric WorksIn Stock: 4832AQY210LS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LH1525ACD is determined by the following critical parameters:

• Circuit configuration (SPST-NO topology)
• Output type capability (AC and DC switching)
• Input voltage compatibility (1.14–1.16VDC range)
• Load voltage rating (minimum 400V or higher)
• Load current capacity (equal to or greater than 270mA)
• On-state resistance (36 Ohms or lower)
• Surface mount termination style (Gull Wing)
• RoHS compliance status

Two substitute parts meet these criteria with varying trade-offs in package size and current capacity.

Parameter Comparison

Engineering Selection Recommendations

LH1525AAB is the primary substitute for the LH1525ACD. Both parts are manufactured by Vishay Semiconductor Opto Division within the same LH1525 series. The LH1525AAB maintains identical load voltage rating (0–400V) and on-state resistance (36 Ohms), with a load current specification of 250mA. This represents a 7.4% reduction in current capacity compared to the main part. The LH1525AAB is currently in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Package footprint differs (6-SMD versus 8-PowerSOIC), requiring PCB layout modification.

AQY210LS is a secondary substitute manufactured by Panasonic Electric Works as part of the PhotoMOS™ AQY series. This part offers superior on-state resistance (25 Ohms) and maintains compatible input voltage specifications. However, the load voltage rating is limited to 0–350V (50V lower than the main part) and load current capacity is 120mA (55.6% reduction). The AQY210LS is in active production with RoHS compliance. The significantly smaller 4-SOP package (0.173", 4.40mm) requires substantial PCB redesign.

Selection between LH1525AAB and AQY210LS depends on application load current requirements and maximum load voltage constraints. For applications requiring the full 270mA current capacity and 400V load voltage, neither substitute provides complete parameter matching. For applications tolerating reduced current capacity, LH1525AAB is preferred due to maintained voltage rating and series continuity.

Frequently Asked Questions (FAQ)

Q: Can the LH1525AAB directly replace the LH1525ACD without circuit modification?

A: The LH1525AAB is electrically compatible for applications where load current does not exceed 250mA and load voltage remains within 0–400V. However, PCB layout modification is required due to different package footprints (6-SMD versus 8-PowerSOIC). Input voltage tolerance is within acceptable range (1.16VDC versus 1.15VDC).

Q: What is the primary limitation of the AQY210LS as a substitute?

A: The AQY210LS has two significant limitations: maximum load voltage is 350V (not 400V), and load current capacity is 120mA (not 270mA). This part is suitable only for applications with lower current and voltage requirements than the original specification.

Q: Are both substitute parts RoHS compliant?

A: Yes. The LH1525AAB carries ROHS3 compliance, and the AQY210LS carries RoHS compliance. Both meet current regulatory requirements for electronic component manufacturing and distribution.

Q: How do package differences affect substitution feasibility?

A: The LH1525ACD uses an 8-PowerSOIC package (0.220", 5.59mm width), the LH1525AAB uses a 6-SMD package (0.300", 7.62mm), and the AQY210LS uses a 4-SOP package (0.173", 4.40mm). Direct socket replacement is not possible; PCB redesign is required for either substitute. Package selection impacts board space, thermal management, and assembly process compatibility.

Q: What is the input voltage tolerance across all three parts?

A: Input voltage specifications are 1.15VDC (LH1525ACD), 1.16VDC (LH1525AAB), and 1.14VDC (AQY210LS). All three parts operate within a 0.02VDC range, indicating compatible input signal requirements for typical control circuits.