SMBJ28AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ28AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring transient overvoltage protection. This component features a 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 13.2A 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.

Substiute Parts

SMBJ28AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 734SMBJ28AHM3_A/I Datasheet

Current PartRFQ

SMBJ28AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 738SMBJ28AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ28AHM3_A/I is determined by strict equivalence across the following critical electrical and mechanical 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
• Package / Case: DO-214AA, SMB
• Unidirectional Channels: 1
• Type: Zener
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Automotive Grade and AEC-Q101 Qualification

The SMBJ28AHM3_B/I is identified as the manufacturer-recommended substitute. This part maintains identical electrical specifications and package configuration while transitioning from obsolete to active product status. The substitution is based on matching all critical voltage, current, thermal, and compliance parameters within the TransZorb® series.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ28AHM3_B/I is the direct equivalent for the obsolete SMBJ28AHM3_A/I. Both components are manufactured by Vishay within the TransZorb® series and maintain identical electrical performance specifications across all critical parameters: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V maximum clamping voltage, and 13.2A peak pulse current.

Both parts carry automotive-grade qualification with AEC-Q101 certification and ROHS3 compliance, ensuring suitability for automotive and telecom applications requiring transient overvoltage protection. The transition from obsolete to active product status makes the SMBJ28AHM3_B/I the appropriate selection for new designs and component replenishment. The packaging difference (bulk versus Tape & Reel) reflects standard industry practice for active versus legacy product offerings and does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMBJ28AHM3_B/I be used as a direct replacement for SMBJ28AHM3_A/I in existing designs?

A: Yes. The SMBJ28AHM3_B/I is electrically and mechanically identical to the SMBJ28AHM3_A/I across all critical parameters. Both components feature the same 28V reverse standoff voltage, 45.4V clamping voltage, 13.2A peak pulse current, DO-214AA package, and automotive AEC-Q101 qualification. No circuit modifications are required.

Q: What is the difference between the SMBJ28AHM3_A/I and SMBJ28AHM3_B/I?

A: The primary difference is product status. The SMBJ28AHM3_A/I is obsolete, while the SMBJ28AHM3_B/I is active. Additionally, the SMBJ28AHM3_B/I is supplied in Tape & Reel packaging, whereas the SMBJ28AHM3_A/I was supplied in bulk packaging. Electrical and thermal specifications are identical.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SMBJ28AHM3_A/I and SMBJ28AHM3_B/I carry automotive-grade classification with AEC-Q101 qualification, making them suitable for automotive and telecom transient overvoltage protection applications.

Q: What are the key parameters that define substitution compatibility for this TVS diode?

A: Substitution compatibility is determined by matching the reverse standoff voltage (28V), breakdown voltage (31.1V), clamping voltage (45.4V), peak pulse current (13.2A), power rating (600W), package type (DO-214AA SMB), channel configuration (unidirectional), and operating temperature range (-55°C to 150°C). All these parameters must remain identical for direct substitution.

Q: Can this part be used in non-automotive applications?

A: Yes. While qualified for automotive use, the SMBJ28AHM3_B/I is suitable for any telecom or general industrial application requiring 28V transient voltage suppression with the specified electrical characteristics and surface mount DO-214AA package.