HSR312S Solid State Relay - Equivalent & Substitute Parts

Part Overview

The HSR312S 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. It is designed for AC and DC load switching applications with a maximum load voltage of 0-250V and load current capacity of 190 mA. The HSR312S is classified as an Obsolete product, making identification of equivalent substitute parts essential for ongoing system maintenance, repairs, and new designs requiring compatible alternatives.

Substiute Parts

HSR312S

onsemiIn Stock: 2103HSR312S Datasheet

Current PartRFQ

LH1510AAB

Vishay Semiconductor Opto DivisionIn Stock: 1470LH1510AAB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HSR312S is determined by strict alignment of 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.

Mounting Type & Package: Surface Mount configuration with 6-SMD (0.300", 7.62mm) package and Gull Wing termination style must be preserved for PCB compatibility and assembly process alignment.

Output Type: AC and DC load switching capability must be maintained.

Electrical Ratings: Load voltage range, load current capacity, input voltage, and on-state resistance are critical parameters. Substitute parts must meet or exceed the original specifications to ensure safe operation within the intended application envelope.

Environmental Compliance: Moisture Sensitivity Level (MSL) and REACH status must be compatible with the original design requirements.

The LH1510AAB from Vishay Semiconductor Opto Division qualifies as a substitute based on matching circuit configuration, mounting type, package specification, and environmental compliance parameters.

Parameter Comparison

Engineering Selection Recommendations

The LH1510AAB from Vishay Semiconductor Opto Division is a qualified substitute for the obsolete HSR312S. The substitute maintains identical circuit configuration, mounting type, package specification, and environmental compliance (MSL 1, REACH Unaffected).

The LH1510AAB offers the advantage of Active product status, ensuring continued availability and supply chain reliability. Additionally, the LH1510AAB carries ROHS3 compliance, meeting current regulatory requirements for new designs and manufacturing processes.

When evaluating substitution, verify that the application load voltage does not exceed 200V (compared to the original 250V maximum) and confirm that the higher on-state resistance (15 Ohms versus 10 Ohms) is acceptable for the intended thermal and power dissipation profile. The lower input voltage requirement (1.27 VDC versus 1.6 VDC) of the LH1510AAB may provide operational advantages in low-voltage control circuits.

Frequently Asked Questions (FAQ)

Q: Can the LH1510AAB directly replace the HSR312S in existing designs?

A: The LH1510AAB is mechanically and functionally compatible with the HSR312S due to identical circuit configuration, package specification, and mounting type. However, application-specific verification is required to confirm that the reduced maximum load voltage (200V versus 250V) and increased on-state resistance (15 Ohms versus 10 Ohms) are acceptable for your specific load conditions.

Q: What is the primary reason for substituting the HSR312S?

A: The HSR312S is classified as Obsolete, meaning it is no longer manufactured by onsemi. The LH1510AAB is an Active product from Vishay, ensuring long-term availability and supply chain continuity.

Q: Are there any compliance differences between the two parts?

A: Both parts maintain MSL 1 (Unlimited) and REACH Unaffected status. The LH1510AAB additionally carries ROHS3 compliance, which is beneficial for new designs and manufacturing processes subject to current environmental regulations.

Q: How do the electrical specifications compare?

A: The LH1510AAB meets or exceeds the load current specification (200 mA versus 190 mA). However, it has a reduced maximum load voltage rating (200V versus 250V) and higher on-state resistance (15 Ohms versus 10 Ohms). The input voltage requirement is lower (1.27 VDC versus 1.6 VDC), which may be advantageous in low-voltage control applications.

Q: Is the 6-SMD package identical between both parts?

A: Yes. Both the HSR312S and LH1510AAB use the 6-SMD (0.300", 7.62mm) package with Gull Wing termination style, ensuring PCB footprint compatibility and assembly process alignment.