SMBG28A-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBG28A-E3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates within the TransZorb® series and is designed for general-purpose transient voltage suppression applications. The part is currently in active production status with 713 units available in new original inventory. Alternative equivalent parts may be required due to supply availability, packaging preferences, or specific application constraints.

Substiute Parts

SMBG28A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 754SMBG28A-E3/5B Datasheet

Current PartRFQ

SMBJ28A-TR

STMicroelectronicsIn Stock: 12726SMBJ28A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBG28A-E3/5B 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 minimum
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C ~ 150°C (TJ)

The SMBJ28A-TR from STMicroelectronics meets all substitution criteria. Both parts share identical voltage specifications, equivalent peak pulse current ratings (13.8A vs. 13.2A), and matching thermal operating ranges. Package differences (DO-215AA vs. DO-214AA) represent minor mechanical variations within the SMB form factor family, both suitable for surface mount assembly.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBG28A-E3/5B and SMBJ28A-TR are active production components with ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on:

• Supply chain availability and lead time requirements
• Packaging preference (DO-215AA gull wing vs. DO-214AA standard SMB)
• Inventory levels (SMBG28A-E3/5B: 713 units; SMBJ28A-TR: 12700 units)
• Existing design documentation and qualification history

The SMBJ28A-TR offers higher peak pulse current capability (13.8A vs. 13.2A) while maintaining identical voltage specifications and thermal performance, providing additional design margin in transient suppression applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ28A-TR directly replace SMBG28A-E3/5B in existing designs?

A: Yes. Both parts share identical voltage ratings (28V standoff, 31.1V breakdown, 45.4V clamping), equivalent peak pulse current specifications, and matching thermal operating ranges (-55°C to 150°C). Package differences (DO-215AA vs. DO-214AA) are minor mechanical variations within the SMB form factor and do not affect electrical performance or PCB footprint compatibility for standard surface mount assembly.

Q: What are the key differences between these substitute parts?

A: The primary differences are manufacturer (Vishay vs. STMicroelectronics), package designation (DO-215AA gull wing vs. DO-214AA standard), peak pulse current (13.2A vs. 13.8A), and available inventory levels. Electrical performance and thermal characteristics are equivalent.

Q: Are both parts RoHS compliant?

A: Yes. Both SMBG28A-E3/5B and SMBJ28A-TR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which part should be selected for new designs?

A: Selection should be based on supply availability, packaging requirements, and inventory levels. The SMBJ28A-TR offers higher peak pulse current (13.8A) and significantly greater inventory availability (12700 units), making it suitable for high-volume production. The SMBG28A-E3/5B remains a valid choice where existing design qualification or specific packaging requirements apply.

Q: Do these parts require different PCB footprints?

A: Both parts use SMB surface mount packages (DO-215AA and DO-214AA). While package designations differ slightly, both are compatible with standard SMB footprints used in modern PCB designs. Verify specific footprint requirements with component datasheets and PCB design guidelines.