SMCJ28CA-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ28CA-M3/9AT is a bidirectional 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 part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and operational parameters within the DO-214AB (SMC) package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.4	V
Current - Peak Pulse (10/1000µs)	33	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	DO-214AB, SMC	-
Type	Zener	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMCJ28CA-M3/9AT 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-214AB, SMC
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1
Operating Temperature Range: -55°C to 150°C minimum

Parts are grouped into three categories based on their relationship to the main part:

Direct Substitutes maintain identical electrical specifications and differ only in packaging designation or tape reel configuration. These parts are interchangeable without circuit modification.

Upgrade Substitutes provide equivalent voltage and clamping characteristics with minor variations in peak pulse current (33A to 33.1A range), maintaining full functional compatibility.

Manufacturer Recommended Alternatives offer enhanced performance specifications (higher peak pulse current or power dissipation) while maintaining core voltage parameters, suitable for applications requiring increased transient protection margin.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Status
SMCJ28CA-M3/9AT	Vishay	28	31.1	45.4	33	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ28CA-E3/57T	Vishay	28	31.1	45.4	33	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ28CA-E3/9AT	Vishay	28	31.1	45.4	33	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ28CA-13-F	Diodes Incorporated	28	31.1	45.4	33	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ28CA	Fairchild Semiconductor	28	31.1	45.4	33.1	1500	-55 to 150	DO-214AB, SMC	Active
5.0SMDJ28CA	MDE Semiconductor Inc	28	31.1	45.4	110	5000	-55 to 150	DO-214AB, SMC	Active
SMCJ28CA-TP	Micro Commercial Co	28	31.1	45.4	33.1	1500	-55 to 175	DO-214AB, SMC	Active
SMLJ28CA	Bourns Inc.	28	31.1	45.4	66	3000	-55 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status and RoHS3 compliance, ensuring long-term availability and regulatory conformance.

Direct Substitutes (SMCJ28CA-E3/57T, SMCJ28CA-E3/9AT, SMCJ28CA-13-F) are recommended for one-to-one replacement without circuit redesign. These parts provide identical electrical performance and package compatibility.

Upgrade Substitutes (SMCJ28CA from Fairchild Semiconductor, SMCJ28CA-TP from Micro Commercial Co) offer marginal improvements in peak pulse current specification (33.1A) while maintaining all other parameters. The SMCJ28CA-TP variant extends the operating temperature range to 175°C, providing additional thermal margin for high-temperature applications.

Enhanced Performance Alternatives (5.0SMDJ28CA, SMLJ28CA) provide increased peak pulse current and power dissipation capacity. The 5.0SMDJ28CA delivers 110A peak pulse current and 5kW power dissipation. The SMLJ28CA provides 66A peak pulse current and 3kW power dissipation. These parts are suitable for applications requiring higher transient energy absorption while maintaining identical voltage regulation characteristics.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28CA-E3/57T replace SMCJ28CA-M3/9AT directly?

A: Yes. Both parts share identical electrical specifications (28V reverse standoff, 31.1V breakdown minimum, 45.4V clamping maximum, 33A peak pulse current) and DO-214AB SMC package configuration. The difference in tape reel designation (57T vs. 9AT) reflects packaging configuration only and does not affect electrical performance or mechanical compatibility.

Q: What is the difference between SMCJ28CA and SMCJ28CA-M3/9AT?

A: The SMCJ28CA (Fairchild Semiconductor) provides equivalent voltage specifications with a marginal increase in peak pulse current specification (33.1A vs. 33A). This represents a negligible performance difference suitable for direct substitution. The base part number SMCJ28 indicates the same voltage class and functional characteristics.

Q: When should I use 5.0SMDJ28CA instead of the standard SMCJ28CA-M3/9AT?

A: The 5.0SMDJ28CA is selected when the application requires higher transient energy absorption capacity. This part provides 110A peak pulse current and 5kW power dissipation compared to 33A and 1500W in the main part. Voltage regulation characteristics remain identical, making this suitable for high-energy transient environments while maintaining the same circuit protection threshold.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 compliance certification. The SMLJ28CA from Bourns Inc. is noted as REACH Affected, while all other parts are REACH Unaffected. Verify REACH compliance requirements for your specific application and supply chain.

Q: Can I use SMLJ28CA as a direct replacement?

A: The SMLJ28CA provides identical voltage specifications and DO-214AB SMC package compatibility. However, it delivers 66A peak pulse current and 3kW power dissipation, representing a 2x increase over the main part. This part is suitable for applications requiring enhanced transient protection margin while maintaining identical voltage regulation.

Q: What is the operating temperature difference between SMCJ28CA-TP and SMCJ28CA-M3/9AT?

A: The SMCJ28CA-TP extends the maximum operating temperature to 175°C compared to 150°C in the main part. This 25°C additional thermal margin is beneficial for high-temperature circuit environments. All other electrical and mechanical specifications remain equivalent.

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