SMCJ28A-E3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ28A-E3/9AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 28V reverse standoff voltage class and provides transient protection for general-purpose applications. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AB (SMC) package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28V	V
Voltage - Breakdown (Min)	31.1V	V
Voltage - Clamping (Max) @ Ipp	45.4V	V
Current - Peak Pulse (10/1000µs)	33A	A
Power - Peak Pulse	1500W	W
Operating Temperature Range	-55°C to 150°C	°C
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMCJ28A-E3/9AT are categorized based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 28V ± tolerance
Voltage - Clamping (Max) @ Ipp: 45.4V (primary) or 59V (alternative)
Current - Peak Pulse: 33A minimum
Package / Case: DO-214AB or SMC equivalent
Mounting Type: Surface Mount
Operating Temperature: -55°C minimum to 150°C minimum
RoHS3 Compliance: Required

Grouping Logic:

Group 1 - Direct Electrical Equivalents (Same Clamping Voltage): Parts with 45.4V clamping voltage, 33A peak pulse current, and identical standoff voltage. These provide pin-for-pin and functional equivalence.

Group 2 - Higher Current Capacity Alternatives (Same Clamping Voltage): Parts with 45.4V clamping voltage but increased peak pulse current (66.1A, 110A). These maintain electrical compatibility while offering enhanced transient handling capability.

Group 3 - Higher Clamping Voltage Alternatives (59V): Parts with 28V standoff voltage but 59V clamping voltage and significantly higher peak pulse current (169A, 334A, 500A). These provide alternative protection characteristics for applications requiring different transient response profiles.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package / Case	Operating Temperature	RoHS Status
SMCJ28A-E3/9AT	Vishay	28V	45.4V	33A	1500W	DO-214AB, SMC	-55°C ~ 150°C	ROHS3
SMCJ28A-E3/57T	Vishay	28V	45.4V	33A	1500W	DO-214AB, SMC	-55°C ~ 150°C	ROHS3
SMCJ28A-13-F	Diodes Incorporated	28V	45.4V	33A	1500W	DO-214AB, SMC	-55°C ~ 150°C	ROHS3
SMCJ28A	Meritek	28V	45.4V	33.04A	1500W	DO-214AB, SMC	-55°C ~ 150°C	ROHS3
3.0SMCJ28A-13	Diodes Incorporated	28V	45.4V	66.1A	3000W	DO-214AB, SMC	-55°C ~ 175°C	ROHS3
5.0SMDJ28A	Taiwan Semiconductor Corporation	28V	45.4V	110A	5000W	DO-214AB, SMC	-55°C ~ 175°C	ROHS3
5.0SMDJ28A-T7	Littelfuse Inc.	28V	45.4V	110A	5000W	DO-214AB, SMC	-65°C ~ 150°C	ROHS3
3.0SMC28A	Littelfuse Inc.	28V	59V	470A	-	DO-214AB, SMC	-65°C ~ 150°C	ROHS3
SM15T33A	STMicroelectronics	28.2V	59V	169A	1500W	DO-214AB, SMC	-55°C ~ 150°C	ROHS3
LNBTVS4-304S	STMicroelectronics	28V	45V	334A	22500W	DO-214AB, SMC	-55°C ~ 150°C	ROHS3
LNBTVS6-304S	STMicroelectronics	28V	45V	500A	22500W	DO-214AB, SMC	-55°C ~ 150°C	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Group 1): SMCJ28A-E3/57T, SMCJ28A-13-F, and SMCJ28A from Vishay, Diodes Incorporated, and Meritek respectively provide identical electrical specifications and are suitable for one-to-one replacement. All maintain Active product status and RoHS3 compliance. Selection among these options depends on supplier availability and lead time requirements.

Enhanced Current Capacity (Group 2): 3.0SMCJ28A-13 (Diodes Incorporated), 5.0SMDJ28A (Taiwan Semiconductor Corporation), and 5.0SMDJ28A-T7 (Littelfuse Inc.) maintain the 45.4V clamping voltage while providing 66.1A to 110A peak pulse current. These are suitable for applications requiring higher transient energy absorption. All are Active status with RoHS3 compliance. Operating temperature extends to 175°C for 3.0SMCJ28A-13 and 5.0SMDJ28A.

Alternative Clamping Voltage (Group 3): 3.0SMC28A (Littelfuse Inc.), SM15T33A (STMicroelectronics), LNBTVS4-304S, and LNBTVS6-304S (STMicroelectronics) operate at 59V clamping voltage with significantly higher peak pulse current (169A to 500A). These are suitable for applications where higher transient voltage clamping is acceptable. All maintain Active status and RoHS3 compliance.

All substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28A-E3/57T be used as a direct replacement for SMCJ28A-E3/9AT?

A: Yes. Both parts share identical electrical specifications: 28V reverse standoff voltage, 45.4V clamping voltage, 33A peak pulse current, and 1500W peak pulse power. The difference is in packaging designation (E3/57T vs. E3/9AT), which reflects tape reel configuration. Both are surface mount DO-214AB packages suitable for automated assembly.

Q: What is the difference between 45.4V and 59V clamping voltage options?

A: The 45.4V clamping voltage (SMCJ28A series) provides tighter voltage regulation during transient events, suitable for sensitive circuits. The 59V clamping voltage (3.0SMC28A, SM15T33A, LNBTVS series) allows higher transient voltage before clamping, suitable for applications tolerating wider voltage excursions. Both maintain the same 28V reverse standoff voltage.

Q: Can I use a higher current-rated part like 5.0SMDJ28A instead of SMCJ28A-E3/9AT?

A: Yes, if circuit board layout and thermal management accommodate the higher power dissipation. The 5.0SMDJ28A provides 110A peak pulse current versus 33A, with 5000W peak pulse power versus 1500W. Electrical characteristics (28V standoff, 45.4V clamping) remain compatible. Verify PCB thermal design supports the increased power rating.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMCJ28A-E3/9AT specifications.

Q: What is the significance of the DO-214AB package designation?

A: DO-214AB is the industry standard surface mount package for TVS diodes in the SMC (Surface Mount Case) family. All listed parts use this package, ensuring mechanical and electrical compatibility with existing PCB designs and automated assembly equipment.

Q: Can STMicroelectronics LNBTVS series parts substitute for Vishay SMCJ28A?

A: Yes, with consideration of higher peak pulse current. LNBTVS4-304S and LNBTVS6-304S maintain 28V reverse standoff voltage and 45V clamping voltage (within 0.4V of SMCJ28A's 45.4V), but provide 334A and 500A peak pulse current respectively. These are suitable for applications requiring enhanced transient handling. All are RoHS3 compliant and Active status.

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