Equivalent & Substitute Parts for 3KASMC15AHE3_A/I

Part Overview

The 3KASMC15AHE3_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 is rated for 15V reverse standoff voltage with a 24.4V maximum clamping voltage and 123A peak pulse current capability, delivering 3000W peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new design implementations.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	15V
Voltage - Breakdown (Min)	16.7V
Voltage - Clamping (Max) @ Ipp	24.4V
Current - Peak Pulse (10/1000µs)	123A
Power - Peak Pulse	3000W
Type	Zener
Unidirectional Channels	1
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Operating Temperature Range	-65°C ~ 185°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC15AHE3_A/I is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 15V (nominal)
Voltage - Breakdown (Min): 16.7V
Voltage - Clamping (Max) @ Ipp: 24.4V
Current - Peak Pulse (10/1000µs): 123A
Power - Peak Pulse: 3000W
Type: Zener, Unidirectional (1 channel)
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain these electrical specifications and mechanical compatibility. Operating temperature ranges may vary within acceptable limits for general-purpose and automotive-grade applications. Packaging format (Tape & Reel) does not affect electrical or mechanical substitution eligibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	Grade
3KASMC15AHE3_A/I	Vishay General Semiconductor	15V	24.4V	123A	3000W	-65°C ~ 185°C	Obsolete	Automotive
3KASMC15AHE3_B/I	Vishay General Semiconductor	15V	24.4V	123A	3000W	-65°C ~ 185°C	Active	Automotive
3SMC15A TR13 PBFREE	Central Semiconductor Corp	15V	24.4V	123A	3000W	-65°C ~ 150°C	Active	General Purpose
SM30T18AY	STMicroelectronics	15V	24.4V	123A	3000W	-55°C ~ 175°C	Active	Automotive
SMC30J15A	STMicroelectronics	15V	24.4V	123A	3000W	-55°C ~ 175°C	Active	General Purpose
SMDJ15A	Alpha & Omega Semiconductor Inc.	15V	24.4V	123A	3000W	-55°C ~ 150°C	Active	General Purpose
SMDJ15A-HR	Littelfuse Inc.	15V	24.4V	123A	3000W	-65°C ~ 150°C	Active	General Purpose
SMDJ15A-HRAT7	Littelfuse Inc.	15V	24.4V	123A	3000W	-65°C ~ 150°C	Active	General Purpose
SMLJ15A-TP	Micro Commercial Co	15V	24.4V	123A	3000W	-55°C ~ 175°C	Active	General Purpose
TPSMD15A	Littelfuse Inc.	15V	24.4V	123A	3000W	-65°C ~ 150°C	Active	Automotive
5.0SMDJ15A	MDE Semiconductor Inc	15V	24.4V	205A	5000W	-55°C ~ 150°C	Active	General Purpose

Engineering Selection Recommendations

For direct replacement of the obsolete 3KASMC15AHE3_A/I, the active equivalent 3KASMC15AHE3_B/I from Vishay General Semiconductor is the primary choice, maintaining identical electrical specifications, automotive-grade qualification (AEC-Q101), and extended operating temperature range (-65°C ~ 185°C).

For applications requiring automotive-grade certification with AEC-Q101 qualification, SM30T18AY (STMicroelectronics) and TPSMD15A (Littelfuse Inc.) are qualified alternatives. Both maintain the 15V/24.4V voltage specifications and 123A peak pulse current with automotive-grade ratings.

For general-purpose applications where automotive qualification is not required, SMLJ15A-TP (Micro Commercial Co) offers the widest operating temperature range (-55°C ~ 175°C) and highest inventory availability (28,876 pcs). SMDJ15A (Alpha & Omega Semiconductor Inc.) provides equivalent specifications with substantial inventory (15,300 pcs).

The 5.0SMDJ15A (MDE Semiconductor Inc.) is not a direct substitute due to higher peak pulse current (205A) and power dissipation (5000W), and should only be selected when enhanced transient protection capability is required.

All listed substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and DO-214AB (SMC) package compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use 5.0SMDJ15A as a direct replacement for 3KASMC15AHE3_A/I?

A: No. While 5.0SMDJ15A maintains the same voltage specifications (15V standoff, 24.4V clamping), it exceeds the original part's current and power ratings (205A vs. 123A; 5000W vs. 3000W). Use only when enhanced transient suppression capability is required by design.

Q: What is the difference between automotive-grade and general-purpose TVS diodes in this list?

A: Automotive-grade parts (3KASMC15AHE3_B/I, SM30T18AY, TPSMD15A) carry AEC-Q101 qualification and are tested to automotive reliability standards. General-purpose parts lack this certification. Select based on application requirements and end-use environment.

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

A: Yes. All listed substitutes use the DO-214AB (SMC) surface mount package, ensuring mechanical and PCB layout compatibility. Packaging format (Tape & Reel) affects handling and assembly but not electrical or mechanical substitution eligibility.

Q: Which substitute offers the best inventory availability?

A: SMLJ15A-TP (Micro Commercial Co) has the highest inventory at 28,876 pcs. SMDJ15A (Alpha & Omega Semiconductor Inc.) is second with 15,300 pcs.

Q: Can I substitute parts with different operating temperature ranges?

A: Operating temperature range substitution depends on your application environment. The original part operates -65°C ~ 185°C. Substitutes with narrower ranges (e.g., -55°C ~ 150°C) are acceptable for applications within those limits. Verify your system's thermal requirements before selection.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental specifications.

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