LH1503AB Equivalent & Substitute Parts

Part Overview

The LH1503AB 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-DIP package. This component is designed for switching applications with load voltages ranging from 0V to 350V and a maximum load current of 110mA. The part is currently obsolete, making equivalent substitutes necessary for new designs or component replacement in legacy systems.

Substiute Parts

LH1503AB

Vishay Semiconductor Opto DivisionIn Stock: 10284LH1503AB Datasheet

Current PartRFQ

LH1520AB

Vishay Semiconductor Opto DivisionIn Stock: 7410LH1520AB Datasheet

MFR RecommendedRFQ

AQW210HL

Panasonic Electric WorksIn Stock: 1343AQW210HL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LH1503AB is determined by strict equivalence across the following critical parameters:

• Circuit configuration: SPST-NO (1 Form A) x 2 channels
• Package type: 8-DIP (0.300", 7.62mm) with PC Pin termination
• Mounting method: Through Hole
• Load voltage range: 0V ~ 350V
• Input voltage: Compatible with 1.26VDC control signal
• Load current capability: Minimum 110mA
• On-state resistance: Maximum 20 Ohms
• Output capability: AC and DC switching

The identified substitutes meet these core electrical and mechanical requirements, enabling direct replacement in existing PCB designs without layout modifications.

Parameter Comparison

Engineering Selection Recommendations

LH1520AB is the primary substitute, manufactured by the same supplier (Vishay Semiconductor Opto Division) with identical electrical specifications and active product status. This part maintains full parameter equivalence with the obsolete LH1503AB and is currently in production.

AQW210HL (PhotoMOS™ AQW series from Panasonic Electric Works) serves as an alternative substitute with slightly enhanced load current capability (120mA versus 110mA) and lower input voltage requirement (1.14VDC versus 1.26VDC). The on-state resistance is marginally higher at 25 Ohms maximum. This part is also in active production status and ROHS3 compliant.

Both substitutes maintain identical package geometry, pin configuration, and load voltage specifications, ensuring mechanical and electrical compatibility with existing designs. Selection between LH1520AB and AQW210HL depends on supplier availability and design margin requirements for load current and on-state resistance.

Frequently Asked Questions (FAQ)

Q: Can LH1520AB be used as a direct replacement for LH1503AB?

A: Yes. LH1520AB is electrically and mechanically equivalent to LH1503AB. Both parts share identical circuit configuration (SPST-NO x 2), package type (8-DIP), load voltage range (0V-350V), load current (110mA), and on-state resistance (20 Ohms maximum). The primary difference is product status: LH1520AB is active while LH1503AB is obsolete.

Q: What are the differences between LH1520AB and AQW210HL?

A: Both parts are functionally compatible substitutes with the same package and circuit configuration. AQW210HL offers 10mA higher load current capability (120mA) and requires slightly lower input voltage (1.14VDC). However, AQW210HL has a maximum on-state resistance of 25 Ohms compared to 20 Ohms for LH1520AB. The choice depends on application requirements for current margin and resistance characteristics.

Q: Are all three parts pin-compatible?

A: Yes. LH1503AB, LH1520AB, and AQW210HL all use the 8-DIP (0.300", 7.62mm) package with PC Pin termination and Through Hole mounting. They are directly interchangeable on PCBs designed for any of these part numbers.

Q: Do the substitute parts support both AC and DC switching?

A: Yes. Both LH1520AB and AQW210HL support AC and DC output switching across the 0V to 350V load voltage range, matching the LH1503AB specification.

Q: Are there compliance or certification differences between the substitutes?

A: All three parts are ROHS3 compliant and REACH unaffected. Both substitutes maintain equivalent compliance status to the original LH1503AB.