3KASMC43HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC43HE3_A/I 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 76.7V maximum clamping voltage at peak pulse current of 39.1A, delivering 3000W peak pulse power dissipation. The device is qualified to AEC-Q101 automotive standards and operates across the temperature range of -65°C to 185°C.

The 3KASMC43HE3_A/I is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field service applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	47.8	V
Voltage - Clamping (Max) @ Ipp	76.7	V
Current - Peak Pulse (10/1000µs)	39.1	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the 3KASMC43HE3_A/I is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 43V and breakdown voltage minimum of 47.8V must be maintained
Clamping Voltage: Maximum clamping voltage at Ipp must not exceed 76.7V to ensure circuit protection integrity
Peak Pulse Current: Minimum 39.1A capability required to handle transient events
Power Dissipation: Minimum 3000W peak pulse power rating required
Package: DO-214AB (SMC) surface mount package mandatory for PCB compatibility
Temperature Range: Operating range must encompass -65°C to 185°C or be suitable for the intended application environment
Compliance: RoHS3 compliance and AEC-Q101 qualification preferred for automotive applications

Substitute parts are grouped into two categories based on electrical performance:

Category A - Direct Electrical Equivalents (3000W Class): Parts with 43V standoff voltage, 69.4V clamping voltage, and 3000W power rating. These provide equivalent or superior performance with improved clamping characteristics.

Category B - Enhanced Performance Alternatives (5000W Class): Parts with 43V standoff voltage, 69.4V clamping voltage, and 5000W power rating. These offer higher power dissipation capability for demanding applications.

Category C - Standard Performance Alternatives (1500W Class): Parts with 43V standoff voltage, 69.4V clamping voltage, and 1500W power rating. These provide functional substitution for lower-stress applications.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Voltage Min (V)	Clamping Voltage Max (V)	Peak Pulse Current (A)	Power Rating (W)	Temp Range (°C)	Package	Status
3KASMC43HE3_A/I	Vishay	43	47.8	76.7	39.1	3000	-65 to 185	DO-214AB	Obsolete
3KASMC43AHE3_B/I	Vishay	43	47.8	69.4	43.2	3000	-65 to 185	DO-214AB	Active
5.0SMDJ43A	Taiwan Semiconductor	43	47.8	69.4	72.1	5000	-55 to 175	DO-214AB	Active
5.0SMDJ43A-T7	Littelfuse Inc.	43	47.8	69.4	72.1	5000	-65 to 150	DO-214AB	Active
SMCJ43A	MDD	43	47.8	69.4	21.7	1500	-50 to 150	DO-214AB	Active
SMCJ43A-13-F	Diodes Incorporated	43	47.8	69.4	21.6	1500	-55 to 150	DO-214AB	Active
SMCJ43A-TP	Micro Commercial Co	43	47.8	69.4	21.7	1500	-55 to 175	DO-214AB	Active
SMDJ43A	Alpha & Omega Semiconductor	43	47.8	69.4	43.3	3000	-55 to 150	DO-214AB	Active
SMLJ43A	Bourns Inc.	43	47.8	69.4	43.2	3000	-55 to 150	DO-214AB	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent: The 3KASMC43AHE3_B/I from Vishay is the direct successor to the obsolete 3KASMC43HE3_A/I. Both parts share the same manufacturer, base product number (3KASMC43), package format, and automotive qualification (AEC-Q101). The 3KASMC43AHE3_B/I maintains the full operating temperature range (-65°C to 185°C) and improves clamping voltage performance (69.4V vs 76.7V) while increasing peak pulse current capability (43.2A vs 39.1A). This part is active and available in tape and reel packaging.

Secondary Recommendation - Enhanced Performance (5000W Class): The 5.0SMDJ43A-T7 from Littelfuse Inc. provides superior power dissipation (5000W vs 3000W) with equivalent voltage ratings and improved current handling (72.1A). This part maintains the full automotive temperature range (-65°C to 150°C) and is actively produced. Selection of this part is appropriate for applications requiring higher transient energy absorption.

Alternative Recommendation - Standard Performance (3000W Class): The SMDJ43A from Alpha & Omega Semiconductor Inc. and SMLJ43A from Bourns Inc. both provide 3000W power rating with 43.3A and 43.2A peak pulse current respectively. Both are active products with RoHS3 compliance. These parts operate within -55°C to 150°C temperature range and are suitable for applications not requiring the full automotive temperature specification.

Consideration for Lower-Stress Applications: The SMCJ43A series (MDD, Diodes Incorporated, Micro Commercial Co) provides 1500W power rating with 21.6-21.7A peak pulse current. These parts are appropriate only for applications with reduced transient stress requirements and should not be selected as direct replacements for the original 3000W-rated device.

Frequently Asked Questions (FAQ)

Q: Can the 3KASMC43AHE3_B/I directly replace the 3KASMC43HE3_A/I?

A: Yes. Both parts share identical voltage ratings (43V standoff, 47.8V breakdown minimum), equivalent power dissipation (3000W), and the same DO-214AB package. The 3KASMC43AHE3_B/I offers improved clamping voltage (69.4V vs 76.7V) and higher peak pulse current (43.2A vs 39.1A), making it a superior direct replacement. Both maintain AEC-Q101 qualification and full automotive temperature range operation.

Q: What is the difference between the 3000W and 5000W rated parts?

A: The 5000W-rated parts (5.0SMDJ43A and 5.0SMDJ43A-T7) provide double the peak pulse power dissipation capability compared to 3000W-rated parts. All maintain identical voltage ratings (43V standoff, 47.8V breakdown, 69.4V clamping). Selection depends on the transient energy levels present in the application circuit. Higher power-rated parts provide additional margin for severe transient events.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant. The SMLJ43A from Bourns Inc. is noted as REACH Affected, while all other parts are REACH Unaffected.

Q: Can I use the 1500W-rated SMCJ43A series as a replacement?

A: The SMCJ43A series is not recommended as a direct replacement for the 3KASMC43HE3_A/I. The original part is rated for 3000W peak pulse power with 39.1A peak pulse current, while the SMCJ43A series provides only 1500W with 21.6-21.7A. Use of the lower-rated part may result in inadequate transient protection and potential device failure under normal operating conditions.

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

A: The original 3KASMC43HE3_A/I operates from -65°C to 185°C. The 3KASMC43AHE3_B/I maintains this full range. The 5000W-rated parts operate to -55°C or -65°C minimum and 150°C maximum. For applications requiring operation above 150°C, the 3KASMC43AHE3_B/I is the only suitable substitute. For applications within -55°C to 150°C, all listed alternatives are acceptable.

Q: Are all parts available in tape and reel packaging?

A: Most substitute parts are available in tape and reel (TR) packaging. The MDD SMCJ43A parts do not specify packaging format in the provided data. Verify packaging availability with the supplier before design finalization.

Q: What certifications are important for automotive applications?

A: AEC-Q101 qualification is the primary automotive standard. The 3KASMC43HE3_A/I and 3KASMC43AHE3_B/I both carry AEC-Q101 qualification. Other listed parts do not specify AEC-Q101 qualification in the provided data. For automotive applications, the Vishay parts are the preferred choice.

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