Equivalent & Substitute Parts for 3KASMC43AHM3_A/I

Part Overview

The 3KASMC43AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 43V reverse standoff with 69.4V maximum clamping voltage and 3000W peak pulse power dissipation. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across the automotive temperature range (-65°C to 185°C) and carries AEC-Q101 qualification for automotive applications.

Key Parameters

Parameter	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)	43.2	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65°C to 185°C	TJ
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC43AHM3_A/I is determined by the following critical parameters:

Voltage - Reverse Standoff: 43V (exact match required)
Voltage - Clamping (Max) @ Ipp: 69.4V (exact match required)
Current - Peak Pulse (10/1000µs): 43.2A nominal (±0.1A tolerance acceptable)
Power - Peak Pulse: 3000W (exact match required)
Package / Case: DO-214AB, SMC (mechanical compatibility required)
Type: Zener, Unidirectional (functional equivalence required)
RoHS Status: ROHS3 Compliant (regulatory compliance required)

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Mechanical Equivalents (3000W Class): Parts matching all critical parameters including 43.2A peak pulse current and 3000W power dissipation. These parts are fully interchangeable with the original component.

Category B - Enhanced Performance Alternatives (5000W Class): Parts with identical voltage specifications but higher peak pulse current (72.1A) and power dissipation (5000W). These provide superior transient protection capability and are suitable for applications requiring increased margin.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status	AEC-Q101
3KASMC43AHM3_A/I	Vishay	43	69.4	43.2	3000	-65 to 185	Obsolete	Yes
3KASMC43AHM3_B/I	Vishay	43	69.4	43.2	3000	-65 to 185	Active	Yes
3SMC43A TR13 PBFREE	Central Semiconductor	43	69.4	43.2	3000	-65 to 150	Active	No
SMDJ43A	Alpha & Omega Semiconductor	43	69.4	43.3	3000	-55 to 150	Active	No
SMDJ43A-HR	Littelfuse	43	69.4	43.2	3000	-65 to 150	Active	No
SMDJ43A-HRAT7	Littelfuse	43	69.4	43.2	3000	-65 to 150	Active	No
SMLJ43AE3/TR13	Microchip Technology	43	69.4	43.2	300	-55 to 150	Active	No
TPSMD43A	Littelfuse	43	69.4	43.2	3000	-65 to 150	Active	Yes
5.0SMDJ43A	Taiwan Semiconductor	43	69.4	72.1	5000	-55 to 175	Active	No
5.0SMDJ43A-T7	Littelfuse	43	69.4	72.1	5000	-65 to 150	Active	No
SMCJ43A	MDD	43	69.4	21.7	1500	-50 to 150	Active	No

Engineering Selection Recommendations

For Automotive Applications (AEC-Q101 Required):

The 3KASMC43AHM3_B/I is the primary recommended substitute. It is manufactured by Vishay, the original manufacturer, maintains identical electrical specifications, carries AEC-Q101 qualification, and is in active production status. The only difference from the obsolete 3KASMC43AHM3_A/I is the packaging format (Tape & Reel vs. bulk), which does not affect electrical performance.

The TPSMD43A from Littelfuse is an alternative for automotive applications, offering AEC-Q101 qualification, active product status, and identical 3000W power dissipation with 43.2A peak pulse current. Operating temperature range is -65°C to 150°C, which is 35°C lower than the original part's maximum.

For General Purpose Applications (Non-Automotive):

The SMDJ43A-HR and SMDJ43A-HRAT7 from Littelfuse provide direct electrical equivalence with 43.2A peak pulse current and 3000W power dissipation. Both are in active production. The SMDJ43A-HR operates to -65°C, matching the original part's lower temperature limit. The SMDJ43A-HRAT7 also extends to -65°C and is available in higher volume.

The 3SMC43A TR13 PBFREE from Central Semiconductor is electrically equivalent with identical 43.2A and 3000W specifications, though operating temperature is limited to -65°C to 150°C.

For Enhanced Protection Requirements:

The 5.0SMDJ43A-T7 from Littelfuse provides 72.1A peak pulse current and 5000W power dissipation while maintaining identical voltage specifications. This part is suitable for applications requiring higher transient energy absorption. Operating temperature extends to -65°C, and it is in active production.

The 5.0SMDJ43A from Taiwan Semiconductor offers the same enhanced 5000W capability with 72.1A peak pulse current. Operating temperature range is -55°C to 175°C.

Parts Not Recommended for Direct Substitution:

The SMLJ43AE3/TR13 from Microchip Technology has significantly reduced power dissipation (300W vs. 3000W) and is not suitable as a direct substitute for applications requiring full 3000W protection capability.

The SMCJ43A from MDD has reduced peak pulse current (21.7A vs. 43.2A) and power dissipation (1500W vs. 3000W), limiting its use to lower-energy transient environments.

Frequently Asked Questions (FAQ)

Q: Can I use the 3KASMC43AHM3_B/I as a direct replacement for the obsolete 3KASMC43AHM3_A/I?

A: Yes. Both parts are manufactured by Vishay with identical electrical specifications: 43V reverse standoff, 69.4V clamping voltage, 43.2A peak pulse current, and 3000W power dissipation. The difference is packaging format (Tape & Reel vs. bulk). Both carry AEC-Q101 qualification and ROHS3 compliance. The 3KASMC43AHM3_B/I is in active production.

Q: What is the difference between the 3000W and 5000W substitute options?

A: The 3000W parts (SMDJ43A-HR, SMDJ43A-HRAT7, TPSMD43A) match the original part's peak pulse current of 43.2A and power dissipation. The 5000W parts (5.0SMDJ43A, 5.0SMDJ43A-T7) provide higher peak pulse current (72.1A) and power dissipation, offering greater transient protection margin. Voltage specifications remain identical across both groups.

Q: Are all substitute parts compatible with automotive applications?

A: Only the 3KASMC43AHM3_B/I and TPSMD43A carry AEC-Q101 qualification. For automotive applications requiring this certification, these are the only approved substitutes. Other parts are suitable for general purpose applications only.

Q: What is the impact of different operating temperature ranges on part selection?

A: The original 3KASMC43AHM3_A/I operates from -65°C to 185°C. Most substitutes operate to -65°C or -55°C minimum but are limited to 150°C maximum, except the 5.0SMDJ43A which reaches 175°C. For applications requiring operation above 150°C, verify thermal management and consider the original part's extended range or consult with the substitute manufacturer.

Q: Can I use SMCJ43A or SMLJ43AE3/TR13 as substitutes?

A: These parts have reduced electrical specifications and are not recommended for direct substitution. The SMCJ43A provides only 1500W power dissipation and 21.7A peak pulse current. The SMLJ43AE3/TR13 provides only 300W power dissipation. Use these only if your application requires lower transient energy absorption than the original design.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts use the DO-214AB (SMC) surface mount package, maintaining mechanical compatibility with the original 3KASMC43AHM3_A/I. Tape & Reel packaging is standard for active production parts. Verify your assembly equipment compatibility with the specific packaging format before procurement.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original part's environmental specifications.

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