SMB8J28CA-M3/5B Equivalent & Substitute Parts

Part Overview

The SMB8J28CA-M3/5B is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AA (SMB) package and is designed for general-purpose transient voltage suppression applications. The part is currently active in production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are necessary to address supply chain variations, inventory availability, or specific manufacturing requirements while maintaining equivalent electrical and mechanical performance.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V
Current - Peak Pulse (10/1000µs)	17.6A
Power - Peak Pulse	800W
Bidirectional Channels	1
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMB8J28CA-M3/5B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 28V
Voltage - Breakdown (Min): 31.1V
Voltage - Clamping (Max) @ Ipp: 45.4V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain these core electrical specifications and package requirements. Variations in peak pulse current (13.2A to 13.8A versus the main part's 17.6A) and power dissipation (600W versus 800W) represent acceptable substitutions within the same functional category, as they remain within the voltage protection envelope and package constraints. Operating temperature ranges may vary between -50°C and -65°C minimum, with maximum temperatures extending to 175°C in some variants, all within acceptable industrial and automotive operating conditions.

Parameter Comparison

Parameter	SMB8J28CA-M3/5B (Vishay)	SMBJ28CA (MDD)	SMBJ28CA-13-F (Diodes Inc.)	SMBJ28CA-TP (Micro Commercial)	SMBJ28CA-TR (STMicroelectronics)	SZ1SMB28CAT3G (Littelfuse)
Manufacturer	Vishay General Semiconductor	MDD	Diodes Incorporated	Micro Commercial Co	STMicroelectronics	Littelfuse Inc.
Voltage - Reverse Standoff (Typ)	28V	28V	28V	28V	28V	28V
Voltage - Breakdown (Min)	31.1V	31.1V	31.1V	31.1V	31.1V	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V	45.4V	45.4V	45.4V	45.4V	45.4V
Current - Peak Pulse (10/1000µs)	17.6A	13.3A	13.2A	13.2A	13.8A	13.2A
Power - Peak Pulse	800W	600W	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature (Min)	-55°C	-50°C	-55°C	-55°C	-55°C	-65°C
Operating Temperature (Max)	150°C	150°C	150°C	175°C	150°C	150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status and ROHS3 compliance, meeting standard industrial and commercial requirements. The SZ1SMB28CAT3G from Littelfuse carries AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade components. The SMBJ28CA-TP from Micro Commercial Co extends the maximum operating temperature to 175°C, providing additional thermal margin in high-temperature environments compared to other variants. Selection should be based on supply chain availability, inventory levels, and specific application temperature requirements, as all parts satisfy the core electrical protection specifications and package constraints of the SMB8J28CA-M3/5B.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SMB8J28CA-M3/5B with any of the listed parts?

A: Yes. All listed substitute parts maintain identical voltage specifications (28V reverse standoff, 31.1V breakdown minimum, 45.4V clamping maximum) and the same DO-214AA SMB package. They are electrically and mechanically compatible for general-purpose transient voltage suppression applications.

Q: What is the difference between the main part and substitutes in terms of peak pulse current?

A: The SMB8J28CA-M3/5B specifies 17.6A peak pulse current, while substitute parts range from 13.2A to 13.8A. Both ratings operate within the same voltage protection envelope and package thermal limits. The lower current rating in substitutes does not affect voltage clamping performance for the specified 28V protection level.

Q: Are there temperature range differences I should consider?

A: Most substitutes operate from -55°C to 150°C, matching the main part. The SMBJ28CA (MDD) has a -50°C minimum, and the SMBJ28CA-TP (Micro Commercial) extends to 175°C maximum. The SZ1SMB28CAT3G (Littelfuse) operates from -65°C to 150°C. Select based on your application's specific temperature requirements.

Q: Does the Littelfuse SZ1SMB28CAT3G offer any additional qualification?

A: Yes. The SZ1SMB28CAT3G carries AEC-Q101 automotive qualification, making it suitable for automotive and high-reliability applications requiring automotive-grade component certification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), matching the compliance profile of the SMB8J28CA-M3/5B.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes. All substitute parts use the identical DO-214AA SMB surface mount package with the same footprint and pin configuration, allowing direct PCB-level substitution without layout modifications.

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