1SMB28CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB28CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 13.2A peak pulse current capability in the DO-214AA (SMB) package format. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB28CAT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
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
Operating Temperature Range	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB28CAT3 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Mandatory Matching 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
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Applications: General Purpose

All identified substitute parts meet these electrical specifications within the allowed tolerances. The substitute parts are grouped by manufacturer and product status, with active status parts preferred for new designs due to ongoing manufacturer support and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
1SMB28CAT3	onsemi	28V	31.1V	45.4V	13.2A	600W	-65°C ~ 150°C	Obsolete	RoHS non-compliant
SMBJ28CA	MDD	28V	31.1V	45.4V	13.3A	600W	-50°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28CA-TR	STMicroelectronics	28V	31.1V	45.4V	13.8A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28CA-13-F	Diodes Incorporated	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28CA-HR	Littelfuse Inc.	28V	31.1V	45.4V	13.3A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28CA-HRA	Littelfuse Inc.	28V	31.1V	45.4V	13.3A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28CA-M3/52	Vishay General Semiconductor - Diodes Division	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28CA-M3/5B	Vishay General Semiconductor - Diodes Division	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28CA-TP	Micro Commercial Co	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are electrically and mechanically compatible with the 1SMB28CAT3 based on the specified parameters. Selection should prioritize active product status parts for new designs and ongoing production support.

For applications requiring RoHS3 compliance, all substitute parts meet this requirement. The 1SMB28CAT3 original part is RoHS non-compliant and obsolete; therefore, migration to an active substitute is necessary for compliant designs.

Temperature range considerations: The SMBJ28CA-TP variant supports extended operating temperature to 175°C, suitable for high-temperature applications. The SMBJ28CA and SMBJ28CA-TR support -55°C minimum, while SMBJ28CA-HR and SMBJ28CA-HRA support -65°C minimum, matching the original part's lower temperature specification.

Peak pulse current ratings vary slightly (13.2A to 13.8A), all exceeding the original 13.2A specification and within acceptable design margins for 28V TVS diode applications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1SMB28CAT3 with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the mandatory electrical parameters: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V maximum clamping voltage, and 600W peak pulse power in the DO-214AA (SMB) package. Direct PCB-level substitution is supported without circuit redesign.

Q: What is the difference between SMBJ28CA variants from different manufacturers?

A: The core electrical specifications are identical across all variants. Differences exist in packaging options (tape & reel variants), temperature range extremes, and manufacturer-specific product series designations (TransZorb® from Vishay, TRANSIL™ from STMicroelectronics). Selection should be based on procurement availability, packaging requirements, and temperature range needs.

Q: Why is the original 1SMB28CAT3 marked as obsolete?

A: The 1SMB28CAT3 is no longer manufactured by onsemi. Active substitute parts from other manufacturers provide equivalent functionality with current production support and modern compliance certifications (RoHS3).

Q: Are there any thermal or reliability differences between substitute parts?

A: All parts share identical electrical ratings and package format. Thermal performance and reliability are equivalent across manufacturers for this component category. Selection should be based on manufacturer availability, lead time, and compliance certifications required for your application.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) formats. The SMBJ28CA from MDD and STMicroelectronics SMBJ28CA-TR are available in standard reel packaging. Verify packaging availability with your supplier for production volume requirements.

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