5KASMC43AHM3/57 Equivalent & Substitute Parts

Part Overview

The 5KASMC43AHM3/57 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AB (SMC) package. This component operates with a 43V reverse standoff voltage and provides 69.4V maximum clamping voltage at peak pulse current, delivering 5000W peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	43V
Voltage - Breakdown (Min)	47.8V
Voltage - Clamping (Max) @ Ipp	69.4V
Power - Peak Pulse	5000W (5kW)
Type	Zener
Unidirectional Channels	1
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Operating Temperature Range	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 5KASMC43AHM3/57 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 43V
Voltage - Breakdown (Min): 47.8V
Voltage - Clamping (Max) @ Ipp: 69.4V
Package / Case: DO-214AB, SMC
Unidirectional Channels: 1
Type: Zener
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Current - Peak Pulse (10/1000µs): Substitutes may vary based on power rating requirements
Power - Peak Pulse: Substitutes range from 1500W to 5000W depending on application demands
Operating Temperature Range: Substitutes maintain minimum -50°C to -65°C lower bound and 150°C to 185°C upper bound
Product Status: Active substitutes are preferred over obsolete originals
Packaging Format: Tape & Reel (TR) acceptable as functional equivalent to bulk packaging

Substitute parts are grouped into three categories based on power dissipation capability: 1500W class (SMCJ series), 3000W class (SMDJ series), and 5000W class (5KASMC series variants).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max)	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package
5KASMC43AHM3/57	Vishay	43V	69.4V	—	5000W	-65°C ~ 185°C	Obsolete	DO-214AB (SMC)
5KASMC43AHM3_A/H	Vishay	43V	69.4V	72A	5000W	-65°C ~ 185°C	Active	DO-214AB (SMC)
SMCJ43A	MDD	43V	69.4V	21.7A	1500W	-50°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ43A-HR	Littelfuse	43V	69.4V	21.7A	1500W	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ43A-HRA	Littelfuse	43V	69.4V	21.7A	1500W	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ43A-HRAT7	Littelfuse	43V	69.4V	21.7A	1500W	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMDJ43A	Alpha & Omega Semiconductor	43V	69.4V	43.3A	3000W	-55°C ~ 150°C	Active	DO-214AB (SMC)
SMDJ43A-HR	Littelfuse	43V	69.4V	43.2A	3000W	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMDJ43A-HRA	Littelfuse	43V	69.4V	43.2A	3000W	-65°C ~ 150°C	Active	DO-214AB (SMC)

Engineering Selection Recommendations

Direct Replacement (5000W Class): The 5KASMC43AHM3_A/H from Vishay is the primary direct substitute, maintaining identical voltage specifications, power rating, and operating temperature range while offering active product status. This part preserves full electrical and thermal performance characteristics of the original obsolete component.

Alternative Substitutes (3000W Class): SMDJ43A, SMDJ43A-HR, and SMDJ43A-HRA provide 3000W peak pulse power dissipation with 43V standoff and 69.4V clamping voltages. These are suitable for applications where transient energy levels do not exceed 3000W. Littelfuse variants (SMDJ43A-HR, SMDJ43A-HRA) extend the lower operating temperature to -65°C, matching the original specification.

Alternative Substitutes (1500W Class): SMCJ43A (MDD), SMCJ43A-HR, SMCJ43A-HRA, and SMCJ43A-HRAT7 (Littelfuse) deliver 1500W peak pulse power with matching voltage parameters. These are applicable only to designs where peak transient power does not exceed 1500W. Littelfuse variants maintain -65°C lower temperature bound.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Littelfuse SMCJ-HR and SMDJ-HR series provide extended temperature operation to -65°C, aligning with automotive-grade requirements. Selection should prioritize power rating sufficiency for the target application and temperature range compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMCJ43A series parts replace the 5KASMC43AHM3/57 in all applications? A: SMCJ43A series parts are electrically compatible for voltage specifications but deliver only 1500W peak pulse power versus the original 5000W rating. Substitution is valid only if application transient energy requirements do not exceed 1500W.

Q: What is the difference between SMCJ43A-HR and SMCJ43A-HRA? A: Both parts share identical electrical specifications (43V standoff, 69.4V clamping, 21.7A peak pulse, 1500W power). The designation difference reflects Littelfuse product line variants; both are functionally equivalent for substitution purposes.

Q: Is the 5KASMC43AHM3_A/H a direct pin-for-pin replacement? A: Yes. The 5KASMC43AHM3_A/H maintains identical DO-214AB (SMC) package geometry, voltage ratings, power dissipation, and operating temperature range (-65°C to 185°C), providing direct substitution without circuit modification.

Q: Why do some substitutes have lower operating temperature maximums? A: SMCJ43A (MDD) and SMDJ43A (Alpha & Omega) specify 150°C maximum junction temperature versus the original 185°C. These parts are suitable for applications with lower thermal stress; automotive-grade designs requiring 185°C operation should select Littelfuse HR variants or the Vishay 5KASMC43AHM3_A/H.

Q: Are Tape & Reel (TR) packaged parts functionally equivalent to bulk packaging? A: Yes. Tape & Reel packaging is a delivery format variation only. Electrical and mechanical specifications remain identical; TR packaging is standard for automated assembly processes.

Q: What determines whether to select SMDJ43A over SMCJ43A? A: Peak pulse current and power dissipation requirements determine selection. SMDJ43A delivers 43.2A peak pulse and 3000W power; SMCJ43A delivers 21.7A peak pulse and 1500W power. Select based on transient energy levels in the target circuit.

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