SMCJ28A-M3/9AT Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMCJ28A-M3/9AT 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 category and is designed for general purpose transient protection applications. The part is active in production status with 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

Substitution eligibility for the SMCJ28A-M3/9AT is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Reverse Standoff (Typ): 28V
Voltage - Breakdown (Min): 31.1V
Voltage - Clamping (Max) @ Ipp: 45.4V
Current - Peak Pulse (10/1000µs): 33A (±tolerance acceptable)
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1

Secondary Compatibility Factors:

Operating Temperature Range: -55°C minimum to 150°C minimum
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parts are grouped into three categories based on substitution scope:

Category 1 - Direct Equivalents (Identical Electrical & Mechanical Parameters): Parts matching all primary criteria with identical peak pulse current (33A) and power rating (1500W).

Category 2 - Enhanced Performance Substitutes (Higher Current/Power Rating): Parts with identical voltage parameters but higher peak pulse current and power dissipation capability, suitable for applications requiring additional margin.

Category 3 - Alternative Voltage Clamp Characteristics: Parts with matching standoff and breakdown voltages but different clamping voltage or peak pulse specifications, requiring application-level verification.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) V	Vbr (Min) V	Vc (Max) V	Ipp A	Ppk W	Tj (Max) °C	Package	Status
SMCJ28A-M3/9AT	Vishay	28	31.1	45.4	33	1500	150	DO-214AB	Active
SMCJ28A-E3/57T	Vishay	28	31.1	45.4	33	1500	150	DO-214AB	Active
SMCJ28A-E3/9AT	Vishay	28	31.1	45.4	33	1500	150	DO-214AB	Active
SMCJ28A	Meritek	28	31.1	45.4	33.04	1500	150	DO-214AB	Active
SMCJ28A-13-F	Diodes Incorporated	28	31.1	45.4	33	1500	150	DO-214AB	Active
3.0SMCJ28A-13	Diodes Incorporated	28	31.1	45.4	66.1	3000	175	DO-214AB	Active
5.0SMDJ28A	Taiwan Semiconductor	28	31.1	45.4	110	5000	175	DO-214AB	Active
5.0SMDJ28A-T7	Littelfuse Inc.	28	31.1	45.4	110	5000	150	DO-214AB	Active
SM15T33A	STMicroelectronics	28.2	31.4	59	169	1500	150	DO-214AB	Active
SMCJ28A-TR	STMicroelectronics	28	31.1	59	169	1500	150	DO-214AB	Active

Engineering Selection Recommendations

Direct Substitution (No Application Modification Required):

SMCJ28A-E3/57T, SMCJ28A-E3/9AT, SMCJ28A (Meritek), and SMCJ28A-13-F are direct electrical and mechanical equivalents. All maintain identical voltage parameters (28V Vwm, 31.1V Vbr, 45.4V Vc), peak pulse current (33A nominal), and power dissipation (1500W). All are ROHS3 compliant with MSL 1 rating and surface mount DO-214AB packaging. These parts are interchangeable at the circuit board level without design modification.

Enhanced Performance Substitution (Higher Transient Margin):

3.0SMCJ28A-13, 5.0SMDJ28A, and 5.0SMDJ28A-T7 provide increased peak pulse current handling (66.1A to 110A) and power dissipation (3000W to 5000W) while maintaining identical voltage clamping characteristics. These are suitable for applications requiring additional transient protection margin or higher repetitive pulse stress tolerance. Operating temperature maximum extends to 175°C for 3.0SMCJ28A-13 and 5.0SMDJ28A. All maintain ROHS3 compliance and surface mount packaging.

Alternative Voltage Clamp Characteristics:

SM15T33A and SMCJ28A-TR exhibit higher clamping voltage (59V vs. 45.4V) and significantly higher peak pulse current (169A vs. 33A). These parts maintain the 28V standoff voltage family but provide different transient response characteristics. Selection requires verification that the higher clamping voltage is acceptable for the protected circuit.

Compliance & Certification:

All listed substitutes maintain ROHS3 compliance, EAR99 export classification, and REACH unaffected status matching the original part. Moisture sensitivity level remains MSL 1 (Unlimited) across all direct equivalents.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28A-E3/57T replace SMCJ28A-M3/9AT in existing designs?

A: Yes. Both parts are Vishay TransZorb® series devices with identical electrical specifications (28V Vwm, 45.4V Vc, 33A Ipp, 1500W Ppk) and DO-214AB surface mount packaging. The difference is packaging format (57T vs. 9AT reel configuration). No circuit modification is required.

Q: What is the difference between SMCJ28A and SMCJ28A-13-F?

A: Both are 28V standoff TVS diodes with identical electrical parameters and DO-214AB packaging. SMCJ28A-13-F is manufactured by Diodes Incorporated while SMCJ28A (Meritek version) is from a different supplier. Electrical performance is equivalent; supplier and lead time availability may differ.

Q: Can 3.0SMCJ28A-13 be used instead of SMCJ28A-M3/9AT?

A: Yes, with design consideration. The 3.0SMCJ28A-13 maintains identical voltage parameters but doubles the peak pulse current (66.1A vs. 33A) and power dissipation (3000W vs. 1500W). This provides additional transient protection margin. Operating temperature extends to 175°C. No circuit modification is required; the higher rating provides enhanced performance.

Q: Why does SM15T33A have a higher clamping voltage (59V vs. 45.4V)?

A: SM15T33A is an STMicroelectronics TRANSIL™ series device with different internal design characteristics. While it maintains the 28V standoff voltage family, its clamping voltage is 59V. This part is suitable only if the protected circuit can tolerate the higher transient voltage. Verify application requirements before substitution.

Q: Are all listed parts surface mount compatible with DO-214AB footprints?

A: Yes. All substitute parts use DO-214AB (SMC) surface mount packaging and are compatible with standard SMC footprints. Tape & Reel (TR) packaging format may vary (9AT, 57T, 13-F designations indicate different reel configurations), but PCB placement and soldering requirements remain identical.

Q: What is the significance of the voltage tolerance in Vwm (28V vs. 28.2V)?

A: SM15T33A specifies 28.2V Vwm while other parts specify 28V. This 0.2V difference falls within normal manufacturing tolerance for the 28V standoff voltage family. Both are functionally equivalent for 28V protection applications. Breakdown voltage (Vbr) remains within specification at 31.1V to 31.4V.

Q: Can 5.0SMDJ28A-T7 be substituted if the application requires -65°C minimum operating temperature?

A: Yes. 5.0SMDJ28A-T7 specifies -65°C to 150°C operating range, extending the minimum temperature 10°C lower than the original SMCJ28A-M3/9AT (-55°C to 150°C). This part is suitable for low-temperature applications. All other electrical and mechanical parameters remain compatible.

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