HSR412L Solid State Relay SPST-NO Equivalent & Substitute Parts

Part Overview

The HSR412L is a solid state relay (SSR) manufactured by onsemi, configured as a single-pole single-throw normally open (SPST-NO) device in a 6-DIP through-hole package. This component switches AC and DC loads up to 120 mA at voltages between 0 V and 400 V, controlled by a 1.6 VDC input signal. The HSR412L is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

HSR412L

onsemiIn Stock: 3348HSR412L Datasheet

Current PartRFQ

ASSR-4111-001E

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

SimilarRFQ

LH1546AT

Vishay Semiconductor Opto DivisionIn Stock: 20464LH1546AT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HSR412L is determined by strict equivalence across the following parameters:

• Circuit configuration: SPST-NO (1 Form A) topology
• Package and mounting: 6-DIP (0.300", 7.62mm) through-hole with PC pin termination
• Load voltage range: 0 V to 400 V (or higher)
• Load current: 120 mA nominal
• Output type: AC and DC switching capability
• Input control voltage: Compatible with standard logic-level signals (1.26 VDC to 1.6 VDC)

Two active substitute parts meet these criteria: ASSR-4111-001E (Broadcom Limited) and LH1546AT (Vishay Semiconductor Opto Division). Both maintain identical package geometry, circuit topology, and load current specifications. Variations in input voltage, on-state resistance, and maximum load voltage are within acceptable engineering tolerances for this component class.

Parameter Comparison

Engineering Selection Recommendations

Both ASSR-4111-001E and LH1546AT are active products with current manufacturing status and full regulatory compliance. The ASSR-4111-001E offers improved on-state resistance (25 Ohms versus 35 Ohms) and maintains the full 400 V load voltage specification of the original HSR412L. The LH1546AT provides lower input voltage requirements (1.26 VDC) and reduced on-state resistance (28 Ohms), though its maximum load voltage is limited to 350 V. Both parts carry ROHS3 compliance and REACH unaffected status, meeting modern environmental and regulatory requirements. Selection between these two substitutes depends on specific application load voltage requirements: applications requiring operation above 350 V must use ASSR-4111-001E, while applications operating at 350 V or below may use either part.

Frequently Asked Questions (FAQ)

Q: Can ASSR-4111-001E and LH1546AT be used interchangeably with HSR412L?

A: Both parts are direct substitutes for the HSR412L in applications operating at 350 V or below. For applications requiring load voltages between 350 V and 400 V, only ASSR-4111-001E is suitable. All three parts share identical package geometry, circuit topology, and 120 mA load current rating.

Q: What is the significance of the lower input voltage specifications in the substitute parts?

A: The ASSR-4111-001E requires 1.3 VDC and LH1546AT requires 1.26 VDC for control, compared to 1.6 VDC for the HSR412L. These lower thresholds provide improved sensitivity and are compatible with standard logic-level control signals. Existing designs using 1.6 VDC control signals will operate reliably with either substitute.

Q: How do on-state resistance differences affect circuit performance?

A: The ASSR-4111-001E (25 Ohms) and LH1546AT (28 Ohms) exhibit lower on-state resistance than the HSR412L (35 Ohms). This results in reduced power dissipation and lower voltage drop across the relay during load switching. For 120 mA loads, the voltage drop reduction is approximately 1.2 V to 1.4 V, which is beneficial for most applications.

Q: Are there package or mounting differences between these parts?

A: No. All three parts use identical 6-DIP (0.300", 7.62mm) through-hole packages with PC pin termination. Direct PCB footprint compatibility is confirmed.

Q: What regulatory compliance should be considered when selecting a substitute?

A: Both active substitutes (ASSR-4111-001E and LH1546AT) are ROHS3 compliant and REACH unaffected. The obsolete HSR412L does not carry current compliance certifications. For new designs or procurement requiring modern regulatory compliance, either active substitute is appropriate.