HSR312LS Solid State Relay - Equivalent & Substitute Parts

Part Overview

The HSR312LS is a Surface Mount Solid State Relay (SSR) manufactured by onsemi, configured as a SPST-NO (Single Pole Single Throw - Normally Open) relay with 1 Form A circuit. This component is designed for AC/DC load switching applications with a maximum load current of 170 mA and load voltage range of 0-250V. The HSR312LS operates with a 1.6VDC input signal and features a maximum on-state resistance of 15 Ohms.

The HSR312LS is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for systems utilizing this relay.

Substiute Parts

HSR312LS

onsemiIn Stock: 2235HSR312LS Datasheet

Current PartRFQ

LH1510AAB

Vishay Semiconductor Opto DivisionIn Stock: 1470LH1510AAB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HSR312LS is determined by the following critical parameters:

Circuit Configuration: Both the main part and substitute must maintain SPST-NO (1 Form A) topology to ensure functional equivalence in switching applications.

Package and Mounting: The 6-SMD (0.300", 7.62mm) surface mount package with Gull Wing termination is a primary constraint. Substitute parts must use identical or mechanically compatible packaging to ensure PCB layout compatibility without redesign.

Electrical Performance Envelope: Substitute parts must operate within or exceed the electrical specifications of the HSR312LS:

• Input voltage tolerance: 1.6VDC or lower activation voltage
• Load voltage range: Must support 0-250V or higher
• Load current capacity: Must support 170 mA or higher
• On-state resistance: Must not exceed 15 Ohms

Output Type: AC/DC output capability must be maintained.

The LH1510AAB from Vishay Semiconductor Opto Division qualifies as a direct substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

The LH1510AAB is a qualified substitute for the HSR312LS based on the following engineering criteria:

Functional Equivalence: Both components share identical circuit configuration (SPST-NO), output type (AC/DC), package geometry (6-SMD 0.300"), and termination style (Gull Wing). No PCB layout modifications are required for physical substitution.

Electrical Compatibility: The LH1510AAB meets or exceeds the load current requirement (200 mA vs. 170 mA) and maintains identical on-state resistance (15 Ohms maximum). The substitute's lower input activation voltage (1.27VDC vs. 1.6VDC) provides improved sensitivity and is compatible with existing drive circuits.

Design Constraint: The LH1510AAB has a reduced maximum load voltage rating of 200V compared to the HSR312LS specification of 250V. Applications requiring load voltages above 200V must use the original HSR312LS or identify alternative substitutes with higher voltage ratings.

Product Status and Compliance: The LH1510AAB is an active product with ROHS3 compliance certification, ensuring long-term availability and alignment with current environmental regulations. The HSR312LS obsolete status makes the LH1510AAB the preferred choice for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can the LH1510AAB be used as a direct replacement for the HSR312LS without PCB modifications?

A: Yes. Both components use identical 6-SMD (0.300", 7.62mm) packages with Gull Wing termination. No PCB layout changes are required for physical substitution.

Q: What is the key electrical difference between these two relays?

A: The primary difference is maximum load voltage: HSR312LS supports 0-250V, while LH1510AAB supports 0-200V. The LH1510AAB has a lower input activation voltage (1.27VDC vs. 1.6VDC) and higher load current capacity (200 mA vs. 170 mA).

Q: Is the LH1510AAB suitable for applications requiring 250V load switching?

A: No. Applications requiring load voltages above 200V must continue using the HSR312LS or identify alternative substitutes with higher voltage ratings. The LH1510AAB maximum load voltage is 200V.

Q: What is the impact of the lower input voltage requirement on existing drive circuits?

A: The LH1510AAB's lower activation voltage (1.27VDC) is compatible with existing drive circuits designed for the HSR312LS (1.6VDC). The substitute will activate at a lower input signal level, which is functionally acceptable and does not require circuit redesign.

Q: Why is the HSR312LS classified as obsolete?

A: The HSR312LS is no longer in active production by onsemi. The LH1510AAB from Vishay represents a current-generation alternative with equivalent functionality and improved environmental compliance (ROHS3).

Q: Are there any moisture sensitivity or handling differences between these components?

A: Both components have identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited), indicating no special moisture control requirements during storage or handling.