HSR412 Solid State Relay SPST-NO Equivalent & Substitute Parts

Part Overview

The HSR412 is a solid state relay (SSR) manufactured by onsemi, configured as a SPST-NO (Single Pole Single Throw - Normally Open) switching device in a 6-DIP package. This component is designed for AC and DC load switching applications with a maximum load voltage of 0–400V and load current capacity of 140 mA. The HSR412 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance, design updates, and procurement continuity.

Substiute Parts

HSR412

onsemiIn Stock: 3709HSR412 Datasheet

Current PartRFQ

ASSR-4111-001E

Broadcom LimitedIn Stock: 6001ASSR-4111-001E Datasheet

SimilarRFQ

LH1540AT

Vishay Semiconductor Opto DivisionIn Stock: 7260LH1540AT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HSR412 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Circuit configuration: SPST-NO (1 Form A)
• Package type: 6-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Termination style: PC Pin
• Output type: AC and DC capability
• Load voltage range: Minimum 0–400V (or compatible subset)
• Load current: Minimum 140 mA
• On-state resistance: Maximum 27 Ohms (or lower)
• Input voltage: Compatible with 1.6 VDC control signal

The identified substitute parts meet these criteria while maintaining functional equivalence for direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

Both ASSR-4111-001E and LH1540AT are active product alternatives to the obsolete HSR412. Selection between these substitutes depends on specific application requirements:

ASSR-4111-001E (Broadcom Limited): This substitute maintains the full 0–400V load voltage range of the original HSR412 and offers lower on-state resistance (25 Ohms vs. 27 Ohms). It is ROHS3 compliant and available in active production status. Load current is reduced to 120 mA, which is acceptable for applications not requiring the full 140 mA capacity of the original part.

LH1540AT (Vishay Semiconductor Opto Division): This substitute provides the lowest on-state resistance (20 Ohms) and lowest input voltage requirement (1.26 VDC), offering improved switching efficiency. The load voltage range is limited to 0–350V, which is a constraint for applications requiring the full 400V capability. Load current is 120 mA. This part is ROHS3 compliant and in active production.

Both substitutes are MSL 1 rated and share identical package, mounting, and termination specifications with the HSR412. Selection should account for load voltage requirements and current capacity constraints in the target application.

Frequently Asked Questions (FAQ)

Q: Can the ASSR-4111-001E directly replace the HSR412 in all applications?

A: The ASSR-4111-001E is mechanically and electrically compatible for direct replacement in applications where 120 mA load current is sufficient. It maintains the 0–400V load voltage range of the original HSR412. Verify that your application does not require the full 140 mA capacity before substitution.

Q: What is the primary limitation of the LH1540AT as a substitute?

A: The LH1540AT has a reduced load voltage range of 0–350V compared to the HSR412's 0–400V specification. Applications requiring switching at voltages above 350V must use the ASSR-4111-001E or confirm that the LH1540AT's voltage limit is acceptable for the specific design.

Q: Are both substitute parts RoHS compliant?

A: Yes, both ASSR-4111-001E and LH1540AT are ROHS3 compliant. The HSR412 RoHS status is not specified in the available data.

Q: Do the substitute parts have the same package and pinout as the HSR412?

A: Yes, all three parts use the 6-DIP (0.300", 7.62mm) package with PC Pin termination and through-hole mounting. Physical and electrical pinout compatibility is maintained for direct PCB replacement.

Q: What is the input voltage requirement for each part?

A: HSR412 requires 1.6 VDC input, ASSR-4111-001E requires 1.3 VDC, and LH1540AT requires 1.26 VDC. All three are compatible with standard logic-level control signals. The lower input voltage requirements of the substitutes may provide improved control circuit efficiency.

Q: Are there inventory considerations for these substitutes?

A: ASSR-4111-001E has 5,900 pieces in stock, and LH1540AT has 7,181 pieces in stock. Both are in active production with established supply chains, unlike the obsolete HSR412.