HSR312L Solid State Relay - Equivalent & Substitute Parts

Part Overview

The HSR312L is a solid state relay (SSR) manufactured by onsemi, configured as a SPST-NO (Single Pole Single Throw - Normally Open) switching device. This component is designed for AC and DC load switching applications with a maximum load current of 170 mA and voltage range of 0–250 V. The device features a 6-DIP through-hole package with PC pin termination.

The HSR312L is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

HSR312L

onsemiIn Stock: 3197HSR312L Datasheet

Current PartRFQ

LH1510AT

Vishay Semiconductor Opto DivisionIn Stock: 2122LH1510AT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HSR312L 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 mounting without redesign
• Mounting Type: Must be Through Hole to match existing board layouts
• Termination Style: Must be PC Pin for direct socket compatibility
• Output Type: Must support AC and DC switching
• On-State Resistance: Maximum 15 Ohms to ensure equivalent electrical performance
• Load Current: Must meet or exceed 170 mA requirement
• Load Voltage: Must support the 0–250 V range or higher

The LH1510AT from Vishay Semiconductor Opto Division meets all substitution criteria and is classified as an active product, ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The LH1510AT is the qualified substitute for the HSR312L based on the following factors:

Product Status: The LH1510AT is classified as Active, ensuring continued manufacturing and long-term component availability. The HSR312L is obsolete and no longer produced.

Compliance & Certifications: Both components share identical REACH and ECCN classifications (EAR99), confirming regulatory equivalence. The LH1510AT carries RoHS3 compliance, meeting modern environmental standards.

Electrical Performance: The LH1510AT exceeds the load current specification (200 mA vs. 170 mA) and maintains identical on-state resistance (15 Ohms maximum). The input voltage requirement is lower (1.27 VDC vs. 1.6 VDC), reducing control circuit stress. The load voltage range is reduced to 0–200 V; applications requiring the full 250 V range must be evaluated against actual circuit requirements.

Physical & Mechanical Compatibility: Identical 6-DIP package, through-hole mounting, and PC pin termination ensure direct socket replacement without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the LH1510AT directly replace the HSR312L without PCB modifications?

A: Yes. Both components use identical 6-DIP (0.300", 7.62mm) packages with PC pin termination and through-hole mounting. Direct socket substitution is possible without PCB layout changes.

Q: What is the difference in load voltage rating between these parts?

A: The HSR312L supports 0–250 V, while the LH1510AT supports 0–200 V. For applications operating above 200 V, the LH1510AT is not suitable. For applications at or below 200 V, the LH1510AT is fully compatible.

Q: Does the LH1510AT have better load current capacity?

A: Yes. The LH1510AT is rated for 200 mA maximum load current, compared to 170 mA for the HSR312L. This provides additional design margin for current-limited applications.

Q: Are there any compliance or regulatory differences?

A: No. Both components share identical REACH and ECCN classifications. The LH1510AT includes RoHS3 compliance, which is advantageous for modern manufacturing and environmental requirements.

Q: What is the input voltage difference, and does it matter?

A: The LH1510AT requires 1.27 VDC input versus 1.6 VDC for the HSR312L. The lower requirement reduces control circuit power consumption and stress. Existing control circuits designed for 1.6 VDC will operate the LH1510AT reliably.

Q: Is the LH1510AT available in the same packaging format?

A: Yes. The LH1510AT is supplied in 6-DIP packages. Packaging format (Tube) differs from the original, but the component package itself is identical.