SMBJ28CAHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ28CAHM3_A/I is a bidirectional transient voltage suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications. This component operates as a Zener-type TVS diode in the DO-214AA (SMB) surface mount package with a 28V reverse standoff voltage and 600W peak pulse power rating. The part is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Substiute Parts

SMBJ28CAHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 936SMBJ28CAHM3_A/I Datasheet

Current PartRFQ

SMBJ28CAHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1042SMBJ28CAHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ28CAHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 28V
• Voltage - Breakdown (Min): 31.1V
• Voltage - Clamping (Max) @ Ipp: 45.4V
• Current - Peak Pulse (10/1000µs): 13.2A
• Power - Peak Pulse: 600W
• Bidirectional Channels: 1
• Package / Case: DO-214AA, SMB
• Operating Temperature Range: -55°C to 150°C
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

The SMBJ28CAHM3_B/I is identified as the manufacturer-recommended substitute. Both parts share identical electrical specifications, thermal performance, and compliance certifications. The primary distinction is product status: the original part is obsolete, while the substitute is active. The packaging format differs (bulk versus Tape & Reel), but the component itself maintains full electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ28CAHM3_B/I is the direct equivalent for the obsolete SMBJ28CAHM3_A/I. Selection of the substitute is based on:

• Active product status ensuring long-term availability and manufacturing support
• Identical electrical performance across all critical transient suppression parameters
• Maintained automotive-grade qualification (AEC-Q101) for reliability-critical applications
• Full RoHS3 compliance for regulatory alignment
• Identical thermal operating range (-55°C to 150°C) for temperature-sensitive deployments

The packaging format difference (Tape & Reel versus bulk) does not affect component functionality and is a procurement consideration only. Both parts are suitable for direct replacement in existing designs without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ28CAHM3_B/I be used as a direct replacement for SMBJ28CAHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The substitute is the manufacturer-recommended replacement for the obsolete original part.

Q: What is the difference between the two part numbers?

A: The primary difference is product status. SMBJ28CAHM3_A/I is obsolete; SMBJ28CAHM3_B/I is active. The packaging format also differs (bulk versus Tape & Reel), but this is a supply chain distinction with no impact on component performance.

Q: Are the electrical specifications identical?

A: Yes. Both parts share identical voltage ratings (28V reverse standoff, 31.1V breakdown minimum, 45.4V clamping maximum), current handling (13.2A peak pulse), power dissipation (600W peak pulse), and operating temperature range (-55°C to 150°C).

Q: Does the Tape & Reel packaging affect circuit performance?

A: No. Tape & Reel is a supply and assembly format. Once mounted on the PCB, the component functions identically to bulk-packaged units.

Q: Are both parts automotive-qualified?

A: Yes. Both SMBJ28CAHM3_A/I and SMBJ28CAHM3_B/I carry automotive-grade classification with AEC-Q101 qualification, suitable for automotive and industrial applications requiring high reliability.

Q: Is RoHS compliance maintained in the substitute?

A: Yes. SMBJ28CAHM3_B/I is ROHS3 compliant, matching the compliance status of the original part.