SMBJ28C-E3/52 Equivalent & Substitute Parts

Part Overview

The SMBJ28C-E3/52 is a 28V Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a DO-214AA (SMB) surface mount package. This bidirectional Zener diode is designed for general-purpose transient voltage suppression applications with a peak pulse power rating of 600W and peak pulse current of 12A at a 50V clamping voltage.

The SMBJ28C-E3/52 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMBJ28C-E3/52
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Product Status	Obsolete
Type	Zener
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	50V
Current - Peak Pulse (10/1000µs)	12A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ28C-E3/52 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 28V (all substitutes must match)
Voltage - Breakdown (Min): 31.1V (all substitutes must match)
Package / Case: DO-214AA, SMB (all substitutes must match)
Mounting Type: Surface Mount (all substitutes must match)
Power - Peak Pulse: 600W (all substitutes must match)
Bidirectional Channels: 1 (all substitutes must match)
Type: Zener (all substitutes must match)

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A - Equivalent Clamping Voltage (50V): Parts with identical 50V clamping voltage and 12A peak pulse current, providing direct functional equivalence.

Group B - Alternative Clamping Voltage (45.4V): Parts with lower clamping voltage (45.4V) and higher peak pulse current (13.2A to 13.8A), offering enhanced transient suppression performance within the same voltage class and package specification.

All substitute parts maintain compliance with ROHS3, MSL 1, and general-purpose application requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
SMBJ28C-E3/52	Vishay General Semiconductor - Diodes Division	28V	31.1V	50V	12A	600W	-55°C ~ 150°C	DO-214AA, SMB	Obsolete
SMBJ28CE3/TR13	Microchip Technology	28V	31.1V	50V	12A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-E3/52	Vishay General Semiconductor - Diodes Division	28V	31.1V	45.5V	13.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA	MDD	28V	31.1V	45.4V	13.3A	600W	-50°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-13-F	Diodes Incorporated	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SMBJ28CA-TP	Micro Commercial Co	28V	31.1V	45.4V	13.2A	600W	-55°C ~ 175°C	DO-214AA, SMB	Active
SMBJ28CA-TR	STMicroelectronics	28V	31.1V	45.4V	13.8A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
SZ1SMB28CAT3G	Littelfuse Inc.	28V	31.1V	45.4V	13.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

SMBJ28CE3/TR13 (Microchip Technology) is the preferred direct substitute. It maintains identical electrical specifications (50V clamping, 12A peak pulse current) and package configuration. The part is in active production status with an extended operating temperature range (-65°C ~ 150°C) compared to the obsolete SMBJ28C-E3/52 (-55°C ~ 150°C), providing improved thermal performance margin.

Secondary Recommendation - Enhanced Performance Alternative:

SMBJ28CA-TR (STMicroelectronics) offers enhanced transient suppression capability with a lower clamping voltage (45.4V) and higher peak pulse current (13.8A) within the same 600W power budget and DO-214AA package. This part is in active production status and suitable for applications where improved transient response is beneficial. Operating temperature range is -55°C ~ 150°C.

Alternative Options:

SMBJ28CA-13-F (Diodes Incorporated), SMBJ28CA-E3/52 (Vishay General Semiconductor - Diodes Division), and SZ1SMB28CAT3G (Littelfuse Inc.) are functionally equivalent alternatives with 45.4V clamping voltage and 13.2A peak pulse current. SZ1SMB28CAT3G includes automotive-grade qualification (AEC-Q101) and extended temperature range (-65°C ~ 150°C), suitable for automotive and high-reliability applications.

SMBJ28CA-TP (Micro Commercial Co) provides the widest operating temperature range (-55°C ~ 175°C) among all substitutes, beneficial for high-temperature environments.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and general-purpose application suitability.

Frequently Asked Questions (FAQ)

Q: Can SMBJ28CA-E3/52 be used as a direct replacement for SMBJ28C-E3/52?

A: SMBJ28CA-E3/52 is functionally compatible but not a direct equivalent. Both parts share the same 28V reverse standoff voltage, 31.1V breakdown voltage, and DO-214AA package. However, SMBJ28CA-E3/52 has a lower clamping voltage (45.5V vs. 50V) and higher peak pulse current (13.2A vs. 12A). This represents enhanced transient suppression performance and is suitable for applications where improved clamping characteristics are acceptable.

Q: What is the difference between Group A and Group B substitutes?

A: Group A substitutes (SMBJ28CE3/TR13) maintain the original 50V clamping voltage and 12A peak pulse current, providing direct functional equivalence. Group B substitutes (SMBJ28CA series and SZ1SMB28CAT3G) feature 45.4V clamping voltage with 13.2A to 13.8A peak pulse current, offering lower clamping voltage and higher current handling within the same power budget. Selection depends on application requirements for clamping voltage precision.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts are housed in DO-214AA (SMB) surface mount packages with identical footprints and mounting requirements. No PCB layout modifications are necessary for substitution.

Q: Which substitute is recommended for automotive applications?

A: SZ1SMB28CAT3G (Littelfuse Inc.) is qualified to AEC-Q101 automotive standards and includes automotive-grade designation. This part is recommended for automotive and high-reliability applications requiring formal qualification documentation.

Q: What is the impact of clamping voltage differences on circuit performance?

A: Lower clamping voltage (45.4V vs. 50V) provides tighter transient suppression, reducing peak voltage stress on protected components. Higher peak pulse current (13.2A to 13.8A vs. 12A) enables handling of larger transient events within the same 600W power envelope. Selection should be based on specific circuit protection requirements and component voltage ratings.

Q: Can SMBJ28CA-TP be used in high-temperature environments?

A: Yes. SMBJ28CA-TP (Micro Commercial Co) supports the widest operating temperature range (-55°C ~ 175°C) among all substitutes, making it suitable for high-temperature applications. All other substitutes are rated to -55°C ~ 150°C or -65°C ~ 150°C.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original SMBJ28C-E3/52 specifications.

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