LH1532FP Equivalent & Substitute Parts

Part Overview

The LH1532FP is a solid-state relay (SSR) manufactured by Vishay Semiconductor Opto Division, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay with dual channels in an 8-SOP package. This component is rated for 120 mA load current at 0–350 V output voltage with a 1.22 VDC input trigger. The product is currently obsolete, making equivalent substitutes necessary for new designs or production continuity.

Substiute Parts

LH1532FP

Vishay Semiconductor Opto DivisionIn Stock: 1240LH1532FP Datasheet

Current PartRFQ

AQW210S

Panasonic Electric WorksIn Stock: 1491AQW210S Datasheet

MFR RecommendedRFQ

PAA110STR

IXYS Integrated Circuits DivisionIn Stock: 20128PAA110STR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LH1532FP is determined by the following critical parameters:

• Circuit configuration: SPST-NO (1 Form A) x 2 channels
• Output voltage range: 0–350 V minimum (higher ranges acceptable)
• Load current capability: 120 mA minimum
• Input voltage: 1.22 VDC nominal (±tolerance acceptable)
• Package type: 8-pin surface-mount (SOP or SMD variants acceptable)
• On-state resistance: 20 Ohms maximum (lower values acceptable)
• Mounting compatibility: Surface mount required

Both identified substitutes meet these core electrical and mechanical criteria, though with variations in load current rating, on-state resistance, and package dimensions.

Parameter Comparison

Engineering Selection Recommendations

Both AQW210S and PAA110STR are active products with ROHS3 compliance, providing long-term availability compared to the obsolete LH1532FP.

AQW210S (Panasonic PhotoMOS™ AQW series): This substitute maintains the original 350 V load voltage specification and offers a compact 8-SOP package footprint (0.173" width) compatible with existing PCB layouts. The 100 mA load current rating is 17% lower than the original specification; this substitute is suitable only for applications where the load current does not exceed 100 mA. Input voltage (1.14 VDC) is within acceptable tolerance of the original 1.22 VDC specification. On-state resistance of 35 Ohms is higher than the original 20 Ohms, resulting in increased power dissipation.

PAA110STR (IXYS OptoMOS® PAA series): This substitute exceeds the original load voltage specification (400 V vs. 350 V) and provides the highest load current rating (150 mA), offering design margin above the original 120 mA requirement. Input voltage (1.2 VDC) is nearly identical to the original specification. On-state resistance (22 Ohms) is comparable to the original (20 Ohms). The package footprint is larger (8-SMD, 0.300" width), requiring PCB layout verification for compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can AQW210S be used in applications requiring 120 mA load current? A: No. The AQW210S is rated for a maximum of 100 mA load current. Use only in applications where the actual load current does not exceed 100 mA.

Q: What is the impact of higher on-state resistance in the AQW210S? A: The AQW210S has an on-state resistance of 35 Ohms compared to the original 20 Ohms. This increases power dissipation in the relay output stage. Verify thermal performance in your application.

Q: Is the PAA110STR package compatible with existing LH1532FP PCB layouts? A: The PAA110STR uses an 8-SMD package (0.300" width) compared to the original 8-SOP package (0.180" width). PCB footprint verification is required. Pin-to-pin compatibility must be confirmed before substitution.

Q: Are both substitutes RoHS compliant? A: Yes. Both AQW210S and PAA110STR are ROHS3 compliant, matching the original LH1532FP compliance status.

Q: Which substitute provides the best electrical match to the original LH1532FP? A: PAA110STR provides the closest electrical match with 150 mA load current capability (exceeding the original 120 mA), comparable on-state resistance (22 Ohms vs. 20 Ohms), and higher load voltage rating (400 V vs. 350 V). Package footprint differences require layout verification.

Q: Can both substitutes handle AC and DC loads? A: Yes. Both AQW210S and PAA110STR support AC and DC output types, matching the original LH1532FP specification.