SMCJ45A-M3/9AT Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMCJ45A-M3/9AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface mount component operates in the DO-214AB (SMC) package and is designed for general-purpose transient voltage suppression applications. The part is currently 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 TVS diode category.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	45V
Voltage - Breakdown (Min)	50V
Voltage - Clamping (Max) @ Ipp	72.7V
Current - Peak Pulse (10/1000µs)	20.6A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 150°C (TJ)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the SMCJ45A-M3/9AT are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications: 45V reverse standoff voltage, 50V minimum breakdown voltage, 72.7V maximum clamping voltage, 20.6A peak pulse current, and 1500W peak pulse power. These parts are interchangeable at the circuit level and differ only in packaging format (Tape & Reel versus Cut Tape) or manufacturer source. Direct equivalents include SMCJ45A-E3/57T (Vishay), 1SMC45A TR13 PBFREE (Central Semiconductor Corp), SMCJ45A (Meritek), SMCJ45A-13-F (Diodes Incorporated), and SMCJ45A-TP (Micro Commercial Co).

Higher-Performance Alternatives maintain the same voltage specifications (45V standoff, 50V breakdown, 72.7V clamping) but provide increased peak pulse current and power dissipation capability. These parts are suitable for applications requiring enhanced transient suppression capacity. This category includes 5.0SMDJ45A (Taiwan Semiconductor Corporation, 68.8A / 5000W), SMDJ45A (Alpha & Omega Semiconductor Inc., 41.3A / 3000W), and SMLJ45A (Bourns Inc., 41.2A / 3000W).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temp Range	RoHS Status
SMCJ45A-M3/9AT	Vishay	45V	50V	72.7V	20.6A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3
SMCJ45A-E3/57T	Vishay	45V	50V	72.7V	20.6A	1500W	DO-214AB (SMCJ)	-55°C ~ 150°C	ROHS3
1SMC45A TR13 PBFREE	Central Semiconductor Corp	45V	50V	72.7V	20.6A	1500W	DO-214AB (SMC)	-65°C ~ 150°C	ROHS3
SMCJ45A	Meritek	45V	50V	72.7V	20.63A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3
SMCJ45A-13-F	Diodes Incorporated	45V	50V	72.7V	20.6A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3
SMCJ45A-TP	Micro Commercial Co	45V	50V	72.7V	20.6A	1500W	DO-214AB (SMC)	-55°C ~ 175°C	ROHS3
5.0SMDJ45A	Taiwan Semiconductor Corporation	45V	50V	72.7V	68.8A	5000W	DO-214AB (SMC)	-55°C ~ 175°C	ROHS3
SMDJ45A	Alpha & Omega Semiconductor Inc.	45V	50V	72.7V	41.3A	3000W	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3
SMLJ45A	Bourns Inc.	45V	50V	72.7V	41.2A	3000W	DO-214AB (SMC)	-55°C ~ 150°C	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SMCJ45A-M3/9AT specification. Direct equivalent parts (SMCJ45A-E3/57T, 1SMC45A TR13 PBFREE, SMCJ45A, SMCJ45A-13-F, SMCJ45A-TP) are suitable for one-to-one replacement in existing designs without circuit modification. These parts are active in production status and available in commercial quantities.

Higher-performance alternatives (5.0SMDJ45A, SMDJ45A, SMLJ45A) provide increased peak pulse current and power dissipation while maintaining identical voltage clamping characteristics. Selection of these alternatives is appropriate for applications requiring enhanced transient suppression margin or where circuit design permits utilization of higher power ratings. All alternatives maintain the same DO-214AB (SMC) surface mount package footprint and are compatible with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMCJ45A-TP be used as a direct replacement for SMCJ45A-M3/9AT?

A: Yes. Both parts share identical electrical specifications (45V standoff, 72.7V clamping, 20.6A peak pulse, 1500W power) and the same DO-214AB (SMC) package. SMCJ45A-TP offers an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 150°C), making it suitable for higher-temperature applications.

Q: What is the difference between direct equivalents and higher-performance alternatives?

A: Direct equivalents maintain the exact electrical specifications of the SMCJ45A-M3/9AT (20.6A peak pulse, 1500W power). Higher-performance alternatives increase peak pulse current (41.2A to 68.8A) and power dissipation (3000W to 5000W) while maintaining identical voltage clamping performance. Higher-performance parts are suitable for applications requiring greater transient suppression capacity.

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

A: Yes. All listed substitute parts use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility with the original SMCJ45A-M3/9AT design.

Q: Do substitute parts meet the same compliance requirements?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status. All parts are active in production status.

Q: Can 5.0SMDJ45A be used in place of SMCJ45A-M3/9AT?

A: Yes, with design consideration. The 5.0SMDJ45A maintains identical voltage specifications but provides significantly higher peak pulse current (68.8A versus 20.6A) and power dissipation (5000W versus 1500W). This part is suitable for applications where enhanced transient suppression capacity is beneficial or required.

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