SMCJ40A-HRA Equivalent & Substitute Parts

Part Overview

The SMCJ40A-HRA is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection in surface-mount applications. This component features a 40V reverse standoff voltage with a 64.5V maximum clamping voltage and 23.3A peak pulse current capability in a DO-214AB (SMC) package. The part is RoHS3 compliant and carries an active product status. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and compliance certifications to ensure functional interchangeability in circuit protection applications.

Substiute Parts

SMCJ40A-HRA

LittelfuseIn Stock: 760SMCJ40A-HRA Datasheet

Current PartRFQ

SMCJ40A

MeritekIn Stock: 16042SMCJ40A Datasheet

DirectRFQ

SMCJ40A

MeritekIn Stock: 16042SMCJ40A Datasheet

DirectRFQ

SMCJ40A-E3/57T

Vishay General Semiconductor - Diodes DivisionIn Stock: 36756SMCJ40A-E3/57T Datasheet

DirectRFQ

SMCJ40A-E3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 4603SMCJ40A-E3/9AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMCJ40A-HRA is determined by the following critical parameters:

• Voltage - Reverse Standoff: 40V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 64.5V (exact match required)
• Current - Peak Pulse (10/1000µs): 23.3A nominal (tolerance within ±1% acceptable)
• Package / Case: DO-214AB (SMC) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Type: Zener, Unidirectional (exact match required)
• RoHS Status: ROHS3 Compliant (compliance requirement)

All identified substitute parts meet these criteria. Variations in operating temperature range and manufacturer do not affect functional substitutability when all electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and full compliance with RoHS3 and REACH regulations. Selection among equivalent options should be based on:

• Availability and lead time requirements
• Packaging format preference (Tape & Reel vs. standard packaging)
• Manufacturer preference for supply chain consistency
• Operating temperature range requirements (Littelfuse and Vishay variants support -55°C to -65°C minimum; verify application requirements)

The Meritek SMCJ40A variant offers the highest inventory availability (16,019 pcs). The Vishay TransZorb® series variants (SMCJ40A-E3/57T and SMCJ40A-E3/9AT) are available in Tape & Reel packaging and maintain identical electrical specifications to the original Littelfuse part.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40A (Meritek) be used as a direct replacement for SMCJ40A-HRA (Littelfuse)?

A: Yes. Both parts share identical voltage ratings (40V standoff, 64.5V clamping), peak pulse current (23.26A vs. 23.3A, within tolerance), power dissipation (1500W), and DO-214AB package specifications. Both are RoHS3 compliant and rated for general-purpose transient voltage suppression.

Q: What is the difference between SMCJ40A-E3/57T and SMCJ40A-E3/9AT?

A: Both are Vishay TransZorb® variants with identical electrical specifications. The suffix designations indicate different packaging tape configurations (57T and 9AT refer to reel specifications). Electrical performance and DO-214AB package dimensions are equivalent.

Q: Are operating temperature ranges interchangeable?

A: The Littelfuse SMCJ40A-HRA operates from -65°C to 150°C, while Meritek and Vishay variants operate from -55°C to 150°C. If your application requires operation below -55°C, the Littelfuse part is required. For standard industrial applications (-40°C to 85°C), all variants are suitable.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) packaging is a logistics format only. The SMCJ40A-E3/57T and SMCJ40A-E3/9AT in Tape & Reel format deliver identical electrical characteristics to bulk-packaged variants.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. All substitute parts use the same DO-214AB (SMC) footprint and surface-mount pad layout. No PCB redesign is required for substitution.