HSR312 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The HSR312 is a solid state relay (SSR) manufactured by onsemi, configured as a SPST-NO (Single Pole Single Throw - Normally Open) switching device. It features a 6-DIP through-hole package with a maximum load current of 190 mA and operates across 0-250V AC/DC loads. The HSR312 is classified as obsolete, making identification of compatible substitute components essential for ongoing system maintenance and new design implementations.

Substiute Parts

HSR312

onsemiIn Stock: 2555HSR312 Datasheet

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LH1510AT

Vishay Semiconductor Opto DivisionIn Stock: 2122LH1510AT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HSR312 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 pin alignment
• Mounting Type: Must be Through Hole to match existing board design
• Termination Style: Must be PC Pin for direct socket compatibility
• Output Type: Must support AC and DC operation
• Load Current: Substitute must meet or exceed 190 mA requirement
• Load Voltage Range: Substitute must cover or exceed 0-250V operating range
• Input Voltage: Substitute must be compatible with 1.6 VDC control signal

The LH1510AT from Vishay Semiconductor Opto Division meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The LH1510AT is a direct functional substitute for the HSR312 based on matching circuit topology, package form factor, and pin configuration. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

Key considerations for selection:

• The LH1510AT operates with a lower input voltage requirement (1.27 VDC vs 1.6 VDC), providing improved control signal margin
• Load current capability of 200 mA exceeds the HSR312 requirement of 190 mA
• Maximum load voltage is 200V on the LH1510AT compared to 250V on the HSR312; applications requiring operation above 200V are not suitable for this substitute
• The LH1510AT carries RoHS3 compliance, meeting modern environmental and regulatory standards
• Both parts share identical mechanical and electrical interfaces, enabling direct PCB replacement without layout modifications

Frequently Asked Questions (FAQ)

Q: Can the LH1510AT directly replace the HSR312 in existing designs?

A: Yes, the LH1510AT provides direct replacement capability for the HSR312 in applications where the load voltage does not exceed 200V. The identical 6-DIP package, PC pin termination, and SPST-NO circuit configuration ensure mechanical and electrical compatibility without PCB redesign.

Q: What is the primary limitation when substituting with the LH1510AT?

A: The maximum load voltage rating differs between the two parts. The HSR312 supports 0-250V operation, while the LH1510AT is rated for 0-200V. Applications requiring switching loads above 200V must use the original HSR312 or identify alternative substitutes with higher voltage ratings.

Q: Does the higher on-state resistance of the LH1510AT affect circuit performance?

A: The LH1510AT has a maximum on-state resistance of 15 Ohms compared to 10 Ohms for the HSR312. This 5-Ohm difference results in proportionally higher voltage drop across the relay during conduction. For 190 mA load current, this represents an additional 0.95V drop. Circuit designs with tight voltage margin requirements should account for this difference.

Q: Are there packaging or supply chain advantages to using the LH1510AT?

A: The LH1510AT is supplied in tube packaging and maintains active production status with Vishay Semiconductor Opto Division. The HSR312 is obsolete, making the LH1510AT the preferred choice for new designs and ongoing production requirements where voltage specifications permit.

Q: What certifications apply to the LH1510AT?

A: The LH1510AT is RoHS3 compliant and carries REACH Unaffected status, meeting current environmental and regulatory requirements for electronic component manufacturing and use.