SMBJ7.5CAHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ7.5CAHM3_A/I is a bidirectional transient voltage suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring transient protection. This component features a 7.5V reverse standoff voltage with a 12.9V maximum clamping voltage and 46.5A peak pulse current capability in a surface mount DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

SMBJ7.5CAHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1083SMBJ7.5CAHM3_A/I Datasheet

Current PartRFQ

SMBJ7.5CAHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 912SMBJ7.5CAHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ7.5CAHM3_A/I is determined by strict equivalence across the following critical parameters:

Voltage specifications must match exactly: 7.5V reverse standoff voltage, 8.33V minimum breakdown voltage, and 12.9V maximum clamping voltage at peak pulse current.

Current and power ratings must be identical: 46.5A peak pulse current (10/1000µs) and 600W peak pulse power.

Package and mounting configuration must be identical: DO-214AA (SMB) surface mount package.

Electrical characteristics must be equivalent: bidirectional single-channel zener diode topology.

Compliance and qualification standards must be maintained: AEC-Q101 automotive qualification and ROHS3 compliance.

The substitute part must be from the same manufacturer series (TransZorb®) to ensure consistent performance characteristics and reliability in telecom protection applications.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ7.5CAHM3_B/I is the direct manufacturer-recommended substitute for the obsolete SMBJ7.5CAHM3_A/I. Both parts are electrically and mechanically identical across all critical parameters: voltage ratings, current capacity, power dissipation, package configuration, and thermal operating range.

The primary distinction is product status: the SMBJ7.5CAHM3_A/I is obsolete, while the SMBJ7.5CAHM3_B/I is active and currently in production. Both maintain AEC-Q101 automotive qualification and ROHS3 compliance, ensuring continued suitability for telecom protection applications.

The packaging difference (bulk versus Tape & Reel) reflects standard supply chain practices for active versus obsolete products and does not affect electrical performance or board-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ7.5CAHM3_B/I be used as a direct replacement for the SMBJ7.5CAHM3_A/I?

A: Yes. The SMBJ7.5CAHM3_B/I is electrically and mechanically identical to the SMBJ7.5CAHM3_A/I across all specified parameters. Both are TransZorb® series bidirectional TVS diodes with identical voltage ratings (7.5V standoff, 12.9V clamp), current capacity (46.5A), power rating (600W), and DO-214AA surface mount package. The substitute is manufacturer-recommended and maintains all automotive and compliance certifications.

Q: Why is the SMBJ7.5CAHM3_A/I classified as obsolete?

A: Product obsolescence is determined by the manufacturer based on production discontinuation and market demand. The SMBJ7.5CAHM3_B/I represents the active continuation of this product line with identical electrical and mechanical specifications.

Q: Are there any differences in thermal performance between these parts?

A: No. Both parts operate across the identical temperature range of -55°C to 150°C (junction temperature) and maintain the same 600W peak pulse power rating across this range.

Q: Does the packaging format (bulk versus Tape & Reel) affect compatibility?

A: No. Packaging format affects supply chain logistics and handling but does not impact electrical performance, board-level compatibility, or soldering characteristics. Both formats use the same DO-214AA (SMB) component package.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the SMBJ7.5CAHM3_A/I and SMBJ7.5CAHM3_B/I carry AEC-Q101 automotive qualification and are ROHS3 compliant, meeting automotive industry standards for reliability and environmental compliance.