SMBJ28AHE3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ28AHE3_A/I is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 28V reverse standoff voltage class and provides 600W peak pulse power protection in a compact DO-214AA (SMB) package. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

SMBJ28AHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1141SMBJ28AHE3_A/I Datasheet

Current PartRFQ

SMBJ28AHE3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 709SMBJ28AHE3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ28AHE3_A/I is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 28V
• Voltage - Breakdown (Min): 31.1V
• Voltage - Clamping (Max) @ Ipp: 45.4V to 45.5V tolerance
• Current - Peak Pulse (10/1000µs): 13.2A
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C (TJ)
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

The SMBJ28AHE3_B/I meets all substitution criteria as an active product within the same TransZorb® series, maintaining identical electrical performance specifications and automotive-grade qualification.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ28AHE3_B/I is the direct substitute for the obsolete SMBJ28AHE3_A/I. Both components are manufactured by Vishay within the TransZorb® series and maintain identical electrical specifications across all critical parameters: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V to 45.5V clamping voltage, 13.2A peak pulse current, and 600W peak pulse power rating.

The substitute part carries active product status, ensuring ongoing availability and manufacturing support. Both components meet automotive-grade requirements with AEC-Q101 qualification and ROHS3 compliance. The clamping voltage differential of 0.1V (45.5V versus 45.4V) falls within acceptable engineering tolerance for transient voltage suppression applications.

The SMBJ28AHE3_B/I is supplied in Tape & Reel packaging, suitable for automated assembly processes. Pin configuration, thermal characteristics, and mechanical dimensions remain consistent with the original part, enabling direct PCB-level substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ28AHE3_B/I be used as a direct replacement for SMBJ28AHE3_A/I?

A: Yes. Both parts are electrically and mechanically equivalent within the specified parameter tolerances. The substitute maintains identical voltage ratings, current handling, power dissipation, package dimensions, and automotive qualification.

Q: What is the significance of the 0.1V difference in clamping voltage (45.5V vs 45.4V)?

A: This 0.1V variation is within normal manufacturing tolerance for TVS diodes and does not affect functional compatibility. Both values fall within the same clamping voltage specification band for the 28V class.

Q: Are there any packaging differences between the two parts?

A: The main part (SMBJ28AHE3_A/I) packaging is not specified in the data. The substitute (SMBJ28AHE3_B/I) is supplied in Tape & Reel format. Both use the DO-214AA (SMB) package case, ensuring identical PCB footprint and mounting compatibility.

Q: Does the change from obsolete to active product status affect electrical performance?

A: No. Product status reflects manufacturing availability, not electrical characteristics. The active status of SMBJ28AHE3_B/I ensures continued supply and manufacturing support.

Q: Are both parts automotive-qualified?

A: Yes. Both SMBJ28AHE3_A/I and SMBJ28AHE3_B/I carry automotive-grade designation with AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: What is the moisture sensitivity level for the substitute part?

A: The substitute part carries MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions for storage or handling.