SMBJ28A-Q Equivalent & Substitute Parts

Part Overview

The SMBJ28A-Q is an automotive-grade unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc. in SMB (DO-214AA) surface mount package. This component is designed for telecom applications requiring transient voltage protection with a 28V reverse standoff voltage and 45.4V maximum clamping voltage. The part is currently in active production status with AEC-Q101 automotive qualification and ROHS3 compliance. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

SMBJ28A-Q

Bourns Inc.In Stock: 1839SMBJ28A-Q Datasheet

Current PartRFQ

SMBJE28AH

Eaton - Electronics DivisionIn Stock: 4172SMBJE28AH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ28A-Q is determined by strict alignment of 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): ≤13.3A (equal or lower)
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Unidirectional Channels: 1
• Operating Temperature Range: -55°C to 150°C (TJ)
• Mounting Type: Surface Mount
• Grade: Automotive
• Qualification: AEC-Q101

The SMBJE28AH from Eaton - Electronics Division meets all substitution criteria with matching voltage specifications, equivalent peak pulse current (13.2A), identical package configuration, automotive grade, AEC-Q101 qualification, and compatible operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBJ28A-Q and SMBJE28AH are active production components with identical automotive grade classification and AEC-Q101 qualification. Selection between these parts is based on availability, lead time, and supply chain requirements. The SMBJE28AH demonstrates marginally lower peak pulse current (13.2A versus 13.3A), which remains within acceptable substitution tolerance for the specified 28V protection class. Both components maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols. No performance degradation is expected when substituting either part in the specified application.

Frequently Asked Questions (FAQ)

Q: Can SMBJE28AH be used as a direct replacement for SMBJ28A-Q?

A: Yes. Both parts share identical voltage specifications (28V reverse standoff, 31.1V breakdown minimum, 45.4V clamping maximum), equivalent power dissipation (600W peak pulse), matching package configuration (DO-214AA, SMB), and identical automotive qualification (AEC-Q101). The 0.1A difference in peak pulse current (13.2A versus 13.3A) does not affect substitution eligibility.

Q: Are there any package or mounting differences between these parts?

A: No. Both SMBJ28A-Q and SMBJE28AH use the DO-214AA (SMB) surface mount package with identical footprint and mounting requirements.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both components carry AEC-Q101 automotive qualification and are classified as automotive grade, meeting the same reliability and testing standards.

Q: What is the significance of the 0.1A current difference?

A: The peak pulse current specification represents the maximum transient current the device can suppress. The SMBJE28AH at 13.2A remains within the protection envelope for 28V TVS applications and does not introduce functional limitations in the specified use case.

Q: Are there compliance or environmental differences?

A: Both parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level) rating. No environmental or regulatory differences exist between the two components.