SMCJ43A-TP Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMCJ43A-TP is a unidirectional transient voltage suppressor diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 43V reverse standoff voltage with a 69.4V maximum clamping voltage and 21.7A peak pulse current capability in a DO-214AB (SMC) package. The part is RoHS3 compliant, REACH unaffected, and maintains an active product status with 3413 units in current inventory.

Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters while maintaining compatibility with the DO-214AB surface-mount package format. Substitutes are necessary when the primary part becomes unavailable or when design requirements permit higher power dissipation ratings.

Key Parameters

Parameter	SMCJ43A-TP Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	47.8	V
Voltage - Clamping (Max) @ Ipp	69.4	V
Current - Peak Pulse (10/1000µs)	21.7	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMCJ43A-TP are classified into two categories based on electrical compatibility:

Direct Equivalents (Identical Electrical Performance): Parts that maintain the same voltage ratings (43V reverse standoff, 47.8V breakdown minimum, 69.4V clamping maximum) and current handling (21.7A peak pulse) with identical 1500W peak pulse power rating. These parts are pin-compatible and functionally interchangeable without circuit modification.

Higher Power Rated Substitutes (Enhanced Performance): Parts that maintain identical voltage specifications but provide increased peak pulse current and power dissipation ratings. These substitutes are suitable when the application permits higher transient energy absorption or when thermal margin improvement is desired. All substitute parts maintain the DO-214AB (SMC) surface-mount package format and unidirectional (1-channel) configuration.

Critical Substitution Parameters:

Voltage - Reverse Standoff: 43V (fixed)
Voltage - Breakdown (Min): 47.8V (fixed)
Voltage - Clamping (Max) @ Ipp: 69.4V (fixed)
Package / Case: DO-214AB, SMC (fixed)
Unidirectional Channels: 1 (fixed)
Current - Peak Pulse: 21.7A minimum (equal or higher acceptable)
Power - Peak Pulse: 1500W minimum (equal or higher acceptable)

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Temp Range (°C)	Package
SMCJ43A-TP	Micro Commercial Co	43	47.8	69.4	21.7	1500	-55 to 175	DO-214AB, SMC
SMCJ43A	MDD	43	47.8	69.4	21.7	1500	-50 to 150	DO-214AB, SMC
SMCJ43A-13-F	Diodes Incorporated	43	47.8	69.4	21.6	1500	-55 to 150	DO-214AB, SMC
SMDJ43A	Alpha & Omega Semiconductor Inc.	43	47.8	69.4	43.3	3000	-55 to 150	DO-214AB, SMC
SMDJ43A-T7	Littelfuse Inc.	43	47.8	69.4	43.2	3000	-65 to 150	DO-214AB, SMC
SMLJ43A	Bourns Inc.	43	47.8	69.4	43.2	3000	-55 to 150	DO-214AB, SMC
5.0SMDJ43A	Taiwan Semiconductor Corporation	43	47.8	69.4	72.1	5000	-55 to 175	DO-214AB, SMC
5.0SMDJ43A-T7	Littelfuse Inc.	43	47.8	69.4	72.1	5000	-65 to 150	DO-214AB, SMC

Engineering Selection Recommendations

Direct Equivalent Selection: SMCJ43A (MDD) and SMCJ43A-13-F (Diodes Incorporated) provide electrical equivalence to the SMCJ43A-TP with identical 1500W peak pulse power ratings. Both parts maintain RoHS3 compliance and REACH unaffected status. The MDD variant operates within a narrower temperature range (-50 to 150°C) compared to the original part (-55 to 175°C). The Diodes Incorporated SMCJ43A-13-F maintains a lower temperature minimum (-55°C) but shares the same upper temperature limit (150°C). Selection between these direct equivalents depends on application temperature requirements and supplier availability.

Enhanced Power Rating Selection: SMDJ43A (Alpha & Omega Semiconductor Inc.), SMDJ43A-T7 (Littelfuse Inc.), and SMLJ43A (Bourns Inc.) provide 3000W peak pulse power with 43.2-43.3A peak pulse current. These parts are suitable for applications requiring increased transient energy absorption while maintaining identical voltage protection characteristics. SMDJ43A-T7 and SMLJ43A both maintain RoHS3 compliance; however, SMDJ43A-T7 carries REACH Affected status while SMLJ43A carries REACH Affected status. SMLJ43A offers the highest inventory availability (13032 units).

Maximum Power Rating Selection: 5.0SMDJ43A (Taiwan Semiconductor Corporation) and 5.0SMDJ43A-T7 (Littelfuse Inc.) provide 5000W peak pulse power with 72.1A peak pulse current. These parts deliver the highest transient protection capability within the voltage class. The Taiwan Semiconductor variant maintains the original temperature range (-55 to 175°C) and REACH unaffected status. The Littelfuse variant extends the lower temperature limit to -65°C but limits the upper range to 150°C and carries REACH Affected status.

All substitute parts maintain RoHS3 compliance and the DO-214AB (SMC) surface-mount package format, ensuring mechanical and electrical compatibility with the original design footprint.

Frequently Asked Questions (FAQ)

Q: Can SMCJ43A-TP be directly replaced with SMCJ43A from MDD?

A: Yes, SMCJ43A (MDD) is a direct electrical equivalent with identical voltage ratings (43V standoff, 69.4V clamping) and power dissipation (1500W). Both parts use the DO-214AB (SMC) package. The primary difference is the operating temperature range: MDD variant operates from -50 to 150°C versus the original -55 to 175°C. Verify your application's temperature requirements before substitution.

Q: What is the difference between SMDJ43A and SMCJ43A?

A: Both parts maintain identical voltage protection characteristics (43V standoff, 69.4V clamping) and use the DO-214AB (SMC) package. The key difference is peak pulse power rating: SMCJ43A provides 1500W with 21.7A peak pulse current, while SMDJ43A provides 3000W with 43.3A peak pulse current. SMDJ43A is suitable for applications requiring higher transient energy absorption.

Q: Are the 5.0SMDJ43A parts compatible with the original SMCJ43A-TP footprint?

A: Yes, 5.0SMDJ43A and 5.0SMDJ43A-T7 use the same DO-214AB (SMC) surface-mount package as the original part, ensuring mechanical compatibility. Electrically, they maintain identical voltage ratings (43V standoff, 69.4V clamping) but provide significantly higher peak pulse power (5000W) and current (72.1A). These parts are suitable for designs requiring enhanced transient protection margin.

Q: Which substitute part offers the best temperature range coverage?

A: SMCJ43A-TP and 5.0SMDJ43A both operate across -55 to 175°C, providing the widest temperature range among available substitutes. If your application requires operation below -55°C, SMDJ43A-T7 and 5.0SMDJ43A-T7 extend the lower limit to -65°C, though both limit the upper range to 150°C.

Q: What compliance certifications should I verify when selecting a substitute?

A: All listed substitute parts maintain RoHS3 compliance. However, REACH status varies: SMCJ43A (MDD), SMCJ43A-13-F, 5.0SMDJ43A, and 5.0SMDJ43A-T7 are REACH unaffected, while SMDJ43A-T7 and SMLJ43A are REACH affected. Verify your regional regulatory requirements before final part selection.

Q: Can I use a higher power-rated substitute in a design originally specified for SMCJ43A-TP?

A: Yes, higher power-rated substitutes (SMDJ43A series at 3000W or 5.0SMDJ43A series at 5000W) are electrically compatible and provide enhanced transient protection capability. The identical voltage ratings and DO-214AB package ensure circuit compatibility. Higher power ratings provide additional thermal margin and transient energy absorption capacity without affecting circuit operation.

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