LH1503AAC Equivalent & Substitute Parts

Part Overview

The LH1503AAC 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-SMD surface mount package. This component is rated for 110 mA load current across 0–350 V AC/DC output voltage with a 1.26 VDC input trigger voltage and 20 Ohms maximum on-state resistance.

The LH1503AAC has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

LH1503AAC

Vishay Semiconductor Opto DivisionIn Stock: 6517LH1503AAC Datasheet

Current PartRFQ

LH1520AAC

Vishay Semiconductor Opto DivisionIn Stock: 3204LH1520AAC Datasheet

MFR RecommendedRFQ

AQW210HLA

Panasonic Electric WorksIn Stock: 2379AQW210HLA Datasheet

MFR RecommendedRFQ

AQW210HLAZ

Panasonic Electric WorksIn Stock: 20326AQW210HLAZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LH1503AAC is determined by the following critical parameters:

• Circuit configuration: SPST-NO (1 Form A) x 2 dual-channel topology
• Load voltage range: 0 V ~ 350 V AC/DC
• Package type: 8-SMD (0.300", 7.62mm) with gull wing termination
• Mounting method: Surface mount compatibility
• Input trigger voltage: 1.26 VDC nominal
• Load current capability: minimum 110 mA
• On-state resistance: maximum 20 Ohms

The substitute parts identified—LH1520AAC, AQW210HLA, and AQW210HLAZ—maintain electrical compatibility across these parameters. All three alternatives support the same load voltage range, dual-channel SPST-NO configuration, and surface mount 8-SMD package footprint. Variations in load current (110 mA vs. 120 mA) and on-state resistance (20 Ohms vs. 25 Ohms) remain within acceptable operational margins for equivalent substitution.

Parameter Comparison

Engineering Selection Recommendations

LH1520AAC is the primary substitute from Vishay Semiconductor Opto Division. This part maintains identical electrical specifications (110 mA load current, 20 Ohms on-state resistance, 1.26 VDC input) and shares the same manufacturer lineage as the obsolete LH1503AAC. The LH1520AAC holds active product status and is ROHS3 compliant, ensuring long-term availability and regulatory compliance. Packaging is supplied in tube format.

AQW210HLA and AQW210HLAZ are cross-manufacturer alternatives from Panasonic Electric Works. Both parts support the same load voltage range (0–350 V), dual-channel SPST-NO configuration, and 8-SMD package footprint. The AQW210HLA is supplied in tube packaging, while AQW210HLAZ is supplied in tape and reel format. These parts feature a slightly lower input trigger voltage (1.14 VDC vs. 1.26 VDC) and marginally higher on-state resistance (25 Ohms vs. 20 Ohms). Both are RoHS compliant and carry active product status. The AQW210HLAZ offers significantly higher inventory availability (20,300 pcs) compared to other alternatives.

Selection between these substitutes depends on packaging requirements, supply chain preferences, and inventory availability. All three alternatives are electrically compatible with the LH1503AAC within the specified parameter tolerances.

Frequently Asked Questions (FAQ)

Q: Can the LH1520AAC directly replace the LH1503AAC without circuit modifications?

A: Yes. The LH1520AAC maintains identical electrical specifications for input voltage (1.26 VDC), load current (110 mA), on-state resistance (20 Ohms), and load voltage range (0–350 V). The 8-SMD package footprint and gull wing termination are identical, enabling direct PCB substitution.

Q: What are the differences between the Vishay LH1520AAC and Panasonic AQW210 series substitutes?

A: The LH1520AAC is a Vishay product with identical electrical performance to the obsolete LH1503AAC. The Panasonic AQW210HLA and AQW210HLAZ are cross-manufacturer alternatives with slightly different input trigger voltage (1.14 VDC vs. 1.26 VDC) and on-state resistance (25 Ohms vs. 20 Ohms). All three maintain the same load voltage range, dual-channel SPST-NO configuration, and 8-SMD package compatibility.

Q: Are there packaging format differences between the substitute parts?

A: Yes. The LH1520AAC is supplied in tube packaging. The AQW210HLA is supplied in tube format, while the AQW210HLAZ is supplied in tape and reel (TR) format. Packaging selection depends on assembly process requirements and volume considerations.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. The LH1520AAC is ROHS3 compliant. The AQW210HLA and AQW210HLAZ are RoHS compliant. All three alternatives satisfy environmental and regulatory compliance standards.

Q: Which substitute offers the best inventory availability?

A: The AQW210HLAZ (Panasonic) offers the highest inventory availability at 20,300 pcs in stock. The LH1520AAC (Vishay) has 3,147 pcs available, and the AQW210HLA (Panasonic) has 2,340 pcs available.

Q: Can the AQW210 series parts be used in applications requiring the exact 20 Ohms on-state resistance specification?

A: The AQW210HLA and AQW210HLAZ have a maximum on-state resistance of 25 Ohms, compared to 20 Ohms for the LH1503AAC and LH1520AAC. Applications with strict on-state resistance requirements should use the LH1520AAC to maintain the original 20 Ohms specification.