LH1535AT Equivalent & Substitute Parts

Part Overview

The LH1535AT is a solid-state relay (SSR) manufactured by Vishay Semiconductor Opto Division, configured as a SPST-NO (Single Pole Single Throw, Normally Open) device in a 6-DIP through-hole package. This component functions as an electronic switch for AC and DC loads up to 400V with a maximum load current of 120mA. The LH1535AT is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

LH1535AT

Vishay Semiconductor Opto DivisionIn Stock: 10322LH1535AT Datasheet

Current PartRFQ

ASSR-4111-001E

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LH1535AT is determined by strict equivalence across the following critical parameters:

Circuit Configuration: The substitute must maintain SPST-NO (1 Form A) topology to preserve switching functionality in the application.

Package and Mounting: The 6-DIP (0.300", 7.62mm) through-hole package with PC pin termination ensures mechanical and electrical compatibility with existing PCB layouts and sockets.

Electrical Ratings: The substitute must support the same load voltage range (0V ~ 400V), load current (120mA), and input voltage specifications to function within the original circuit design.

Output Type: AC and DC output capability is required to maintain compatibility with both alternating and direct current load applications.

Environmental and Compliance Standards: RoHS3 compliance, MSL Level 1, and REACH unaffected status ensure regulatory alignment and reliability across manufacturing and deployment environments.

The ASSR-4111-001E from Broadcom Limited meets all these substitution criteria and is classified as an active product, providing long-term availability and supply chain stability.

Parameter Comparison

Engineering Selection Recommendations

The ASSR-4111-001E is the qualified substitute for the obsolete LH1535AT based on the following engineering criteria:

Product Status: The ASSR-4111-001E is classified as an active product with confirmed inventory availability (5900 pcs), ensuring reliable procurement and long-term supply chain support compared to the obsolete LH1535AT.

Regulatory Compliance: Both components maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, satisfying environmental and regulatory requirements for manufacturing and deployment.

Electrical Equivalence: The ASSR-4111-001E maintains identical circuit configuration (SPST-NO), load voltage range (0V ~ 400V), and load current rating (120mA). The input voltage specification (1.3VDC versus 1.27VDC) and on-state resistance (25 Ohms versus 20 Ohms) represent minor parameter variations within acceptable operating margins for solid-state relay applications.

Package and Mechanical Compatibility: Identical 6-DIP (0.300", 7.62mm) through-hole packaging with PC pin termination ensures direct replacement capability without PCB redesign or socket modification.

Frequently Asked Questions (FAQ)

Q: Can the ASSR-4111-001E directly replace the LH1535AT without PCB modifications?

A: Yes. Both components use identical 6-DIP (0.300", 7.62mm) through-hole packages with PC pin termination, enabling direct socket replacement without PCB layout changes.

Q: What is the significance of the input voltage difference (1.27VDC versus 1.3VDC)?

A: The 0.03VDC difference represents a 2.4% variation and falls within normal component tolerance ranges. Both specifications support the same control circuit designs and trigger thresholds for solid-state relay applications.

Q: How does the on-state resistance difference (20 Ohms versus 25 Ohms) affect circuit performance?

A: The 5-Ohm increase in maximum on-state resistance results in proportionally higher voltage drop across the relay during conduction. For a 120mA load, this produces an additional 0.6V maximum voltage drop. Circuit designs must accommodate this parameter variation through thermal analysis and load voltage margin verification.

Q: Are both components suitable for AC and DC load switching?

A: Yes. Both the LH1535AT and ASSR-4111-001E support AC and DC output types across the 0V ~ 400V load voltage range, maintaining functional equivalence for mixed-mode switching applications.

Q: What compliance certifications apply to the ASSR-4111-001E?

A: The ASSR-4111-001E maintains ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status, matching the regulatory profile of the LH1535AT.

Q: Is the ASSR-4111-001E available in the same packaging format?

A: Yes. The ASSR-4111-001E is supplied in tube packaging identical to the LH1535AT, maintaining consistency with standard component handling and storage procedures.