LH1546AT Equivalent & Substitute Parts

Part Overview

The LH1546AT is a solid-state relay (SSR) manufactured by Vishay Semiconductor Opto Division, designed for SPST-NO (Single Pole Single Throw - Normally Open) switching applications. This through-hole component operates across AC and DC loads with a maximum voltage rating of 350V and supports load currents up to 120mA. The device is currently in active production status and maintains full RoHS3 compliance. Equivalent parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits functional alternatives within specified electrical and mechanical parameters.

Substiute Parts

LH1546AT

Vishay Semiconductor Opto DivisionIn Stock: 20464LH1546AT Datasheet

Current PartRFQ

AQV210HL

Panasonic Electric WorksIn Stock: 1629AQV210HL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LH1546AT is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Package / Case: Must be 6-DIP (0.300", 7.62mm) to ensure PCB compatibility and pin-to-pin interchangeability
• Mounting Type: Must be Through Hole to match assembly requirements
• Termination Style: Must be PC Pin for direct socket compatibility
• Load Voltage Range: Must support 0V ~ 350V operation
• Output Type: Must support both AC and DC loads
• Load Current: Must meet or exceed 120mA minimum requirement
• Input Voltage: Must be compatible with 1.26VDC control signal

The AQV210HL from Panasonic Electric Works satisfies all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The AQV210HL is a direct functional equivalent to the LH1546AT based on matching electrical specifications and identical mechanical packaging. Both components are active production items with current regulatory compliance. The AQV210HL demonstrates improved performance characteristics: lower input voltage requirement (1.14VDC vs. 1.26VDC), higher load current capacity (130mA vs. 120mA), and lower on-state resistance (25 Ohms vs. 28 Ohms). Both devices maintain identical load voltage ratings (0V ~ 350V) and support AC/DC output switching. Pin-for-pin compatibility is assured through identical 6-DIP package geometry and PC pin termination. Selection between these parts should be based on component availability and supply chain requirements, as both satisfy the specified electrical and mechanical design constraints.

Frequently Asked Questions (FAQ)

Q: Can the AQV210HL replace the LH1546AT in existing designs without PCB modification?

A: Yes. Both components use identical 6-DIP (0.300", 7.62mm) packaging with PC pin termination, ensuring direct pin-for-pin compatibility without PCB layout changes.

Q: What is the significance of the lower input voltage requirement in the AQV210HL?

A: The AQV210HL requires 1.14VDC input versus 1.26VDC for the LH1546AT. This represents improved sensitivity and allows operation with lower control signal levels. Existing control circuits designed for 1.26VDC will operate the AQV210HL without modification.

Q: Are there differences in load current handling between these parts?

A: The AQV210HL supports 130mA maximum load current compared to 120mA for the LH1546AT. This higher capacity provides additional design margin and does not restrict applications designed for the LH1546AT.

Q: Do both parts support identical voltage ranges?

A: Yes. Both the LH1546AT and AQV210HL support load voltages from 0V to 350V and are rated for both AC and DC output switching.

Q: What are the compliance differences between these components?

A: The LH1546AT is RoHS3 compliant. The AQV210HL is RoHS compliant. Both meet current environmental and regulatory requirements for electronic component manufacturing.

Q: Is the on-state resistance difference significant for circuit design?

A: The AQV210HL has lower on-state resistance (25 Ohms maximum vs. 28 Ohms maximum). This results in reduced voltage drop across the relay during conduction, which may improve efficiency in power-sensitive applications but does not prevent substitution in designs specified for the LH1546AT.