SM15T39A-M3/9AT Equivalent & Substitute Parts

Part Overview

The SM15T39A-M3/9AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates as a Zener-type TVS device in the SM15T series, designed for surface mount applications in the DO-214AB (SMCJ) package. The part is active and in production, with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical specifications: 33.3V reverse standoff voltage, 37.1V minimum breakdown voltage, 53.9V maximum clamping voltage, 1500W peak pulse power rating, and compatible DO-214AB surface mount packaging.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33.3	V
Voltage - Breakdown (Min)	37.1	V
Voltage - Clamping (Max) @ Ipp	53.9	V
Current - Peak Pulse (10/1000µs)	28	A
Power - Peak Pulse	1500	W
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature Range	-65 to 150	°C
Type	Zener	-
Unidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SM15T39A-M3/9AT is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Breakdown (Min): 37.1V
Voltage - Clamping (Max) @ Ipp: 53.9V
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1

All identified substitute parts match these core electrical and mechanical specifications. Peak pulse current values vary within acceptable ranges (28A to 29A) while maintaining identical power dissipation and voltage characteristics. All substitutes are active products with RoHS3 compliance and MSL 1 rating.

Parameter Comparison

Parameter	SM15T39A-M3/9AT (Vishay)	1.5SMC39A (Taiwan Semiconductor)	SMCJ1.5KE39A-TP (Micro Commercial Co)	TPSMC39A (Littelfuse)
Voltage - Reverse Standoff (Typ)	33.3V	33.3V	33.3V	33.3V
Voltage - Breakdown (Min)	37.1V	37.1V	37.1V	37.1V
Voltage - Clamping (Max) @ Ipp	53.9V	53.9V	53.9V	53.9V
Current - Peak Pulse (10/1000µs)	28A	29A	28.2A	28.2A
Power - Peak Pulse	1500W	1500W	1500W	1500W
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C	-55 to 150°C
Type	Zener	Zener	Zener	Zener
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All four parts listed—SM15T39A-M3/9AT, 1.5SMC39A, SMCJ1.5KE39A-TP, and TPSMC39A—are active products with RoHS3 compliance and MSL 1 rating, confirming their suitability for equivalent substitution in applications requiring 33.3V standoff, 53.9V clamping TVS protection in DO-214AB surface mount packages.

The 1.5SMC39A (Taiwan Semiconductor Corporation) offers the highest peak pulse current specification at 29A and maintains the same operating temperature upper limit of 150°C as the original part.

The SMCJ1.5KE39A-TP (Micro Commercial Co) provides the widest operating temperature range, extending to 175°C maximum junction temperature, and is suitable for applications requiring extended thermal performance.

The TPSMC39A (Littelfuse Inc.) carries AEC-Q101 automotive qualification, making it the appropriate selection for automotive-grade applications requiring this certification standard.

Selection among these substitutes depends on application-specific requirements: standard industrial use, extended temperature operation, or automotive qualification. All maintain electrical equivalence across voltage and power specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1.5SMC39A replace the SM15T39A-M3/9AT in all applications?

A: Yes, the 1.5SMC39A is electrically equivalent across all critical parameters: 33.3V reverse standoff, 37.1V breakdown, 53.9V clamping, and 1500W peak pulse power. Both use identical DO-214AB surface mount packaging. The 1.5SMC39A operates across -55 to 150°C, compared to the original part's -65 to 150°C range. Applications operating above -55°C will experience no functional difference.

Q: What is the difference between SMCJ1.5KE39A-TP and 1.5SMC39A?

A: Both parts are electrically identical in voltage and power specifications. The primary difference is operating temperature range: SMCJ1.5KE39A-TP extends to 175°C maximum junction temperature, while 1.5SMC39A is rated to 150°C. Selection depends on thermal requirements of the application.

Q: Is TPSMC39A suitable for automotive applications?

A: Yes. TPSMC39A carries AEC-Q101 automotive qualification and is the appropriate choice for automotive-grade circuit protection requiring this certification. It maintains identical electrical specifications to other substitutes.

Q: Do all substitute parts use the same DO-214AB package?

A: Yes. All substitute parts—1.5SMC39A, SMCJ1.5KE39A-TP, and TPSMC39A—use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility with the original SM15T39A-M3/9AT.

Q: Are there differences in peak pulse current ratings among substitutes?

A: Peak pulse current specifications vary slightly: SM15T39A-M3/9AT at 28A, 1.5SMC39A at 29A, SMCJ1.5KE39A-TP at 28.2A, and TPSMC39A at 28.2A. All maintain the same 1500W peak pulse power rating. These minor variations do not affect functional equivalence in circuit protection applications.

Q: Do all parts meet RoHS3 compliance?

A: Yes. All four parts—SM15T39A-M3/9AT, 1.5SMC39A, SMCJ1.5KE39A-TP, and TPSMC39A—are RoHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating.

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