Equivalent & Substitute Parts for 3KASMC15AHM3_A/I TVS Diode

Part Overview

The 3KASMC15AHM3_A/I is a unidirectional Zener 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 26.9V maximum clamping voltage and 112A peak pulse current capability. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

The 3KASMC15AHM3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers with comparable or enhanced electrical characteristics, offering direct functional replacement options while maintaining automotive-grade reliability standards.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	15	V
Voltage - Breakdown (Min)	16.7	V
Voltage - Clamping (Max) @ Ipp	26.9	V
Current - Peak Pulse (10/1000µs)	112	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	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC15AHM3_A/I is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 15V
Voltage - Breakdown (Min): 16.7V
Unidirectional Channels: 1
Type: Zener
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts must maintain the 15V reverse standoff voltage and 16.7V minimum breakdown voltage to ensure circuit protection at the same threshold. The unidirectional Zener topology and surface mount configuration are functional requirements. All substitutes listed are ROHS3 compliant with MSL 1 rating, ensuring compatibility with standard manufacturing and storage conditions.

Clamping voltage, peak pulse current, and power dissipation may vary among substitutes. These variations reflect different manufacturer designs and performance enhancements but do not prevent functional substitution when the core voltage parameters are maintained.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
3KASMC15AHM3_A/I	Vishay General Semiconductor - Diodes Division	15V	16.7V	26.9V	112A	3000W	-65 to 185°C	DO-214AB, SMC	Obsolete
3KASMC15AHM3_B/I	Vishay General Semiconductor - Diodes Division	15V	16.7V	24.4V	123A	3000W	-65 to 185°C	DO-214AB, SMC	Active
5.0SMDJ15A	MDE Semiconductor Inc	15V	16.7V	24.4V	205A	5000W	-55 to 150°C	DO-214AB, SMC	Active
SMCJ15A	EVVO Semi	15V	16.7V	24.4V	61.5A	600W	-65 to 150°C	DO-214AC, SMA	Active
SMCJ15A-13-F	Diodes Incorporated	15V	16.7V	24.4V	61.5A	1500W	-55 to 150°C	DO-214AB, SMC	Active
SMCJ15A-HR	Littelfuse Inc.	15V	16.7V	24.4V	61.5A	1500W	-65 to 150°C	DO-214AB, SMC	Active
SMCJ15A-HRA	Littelfuse Inc.	15V	16.7V	24.4V	61.5A	1500W	-65 to 150°C	DO-214AB, SMC	Active
SMCJ15A-HRAT7	Littelfuse Inc.	15V	16.7V	24.4V	61.5A	1500W	-65 to 150°C	DO-214AB, SMC	Active
SMCJ15A-TR	STMicroelectronics	15V	16.7V	32.5V	308A (8/20µs)	1500W	-55 to 150°C	DO-214AB, SMC	Active

Engineering Selection Recommendations

All listed substitute parts maintain the core voltage parameters (15V reverse standoff, 16.7V minimum breakdown) required for functional equivalence to the 3KASMC15AHM3_A/I. Selection among active alternatives should be based on the following criteria:

Direct Replacement (Same Manufacturer): The 3KASMC15AHM3_B/I from Vishay is the primary direct substitute, offering identical package configuration (DO-214AB, SMC), matching temperature range (-65 to 185°C), and equivalent power rating (3000W). This part is currently active and maintains automotive-grade AEC-Q101 qualification.

Package Compatibility: Parts specified in DO-214AB (SMC) package—including 3KASMC15AHM3_B/I, 5.0SMDJ15A, SMCJ15A-13-F, SMCJ15A-HR, SMCJ15A-HRA, SMCJ15A-HRAT7, and SMCJ15A-TR—are mechanically and electrically compatible with the original footprint. The SMCJ15A from EVVO Semi uses DO-214AC (SMA) package, which differs in physical dimensions and may require PCB layout modification.

Temperature Range Considerations: The original part operates from -65 to 185°C. Substitutes with reduced upper temperature limits (-55 to 150°C) are suitable for applications not requiring the full automotive temperature range. The 3KASMC15AHM3_B/I and Littelfuse variants (SMCJ15A-HR, SMCJ15A-HRA, SMCJ15A-HRAT7) maintain the -65°C lower limit, supporting cold-weather automotive applications.

Compliance and Certification: All substitutes are ROHS3 compliant with MSL 1 rating. The 3KASMC15AHM3_B/I retains automotive-grade qualification. Littelfuse SMCJ-HR and SMCJ-HRA series parts are automotive-qualified alternatives. MDE Semiconductor 5.0SMDJ15A and STMicroelectronics SMCJ15A-TR are active production parts suitable for general-purpose applications.

Performance Enhancements: The 5.0SMDJ15A offers increased peak pulse current (205A) and power dissipation (5000W), providing margin for higher transient stress. The STMicroelectronics SMCJ15A-TR provides 308A peak pulse current with enhanced clamping performance (32.5V), suitable for applications requiring superior transient suppression.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 3KASMC15AHM3_A/I with the 3KASMC15AHM3_B/I?

A: Yes. Both parts share identical voltage parameters (15V reverse standoff, 16.7V breakdown), package configuration (DO-214AB, SMC), and temperature range (-65 to 185°C). The 3KASMC15AHM3_B/I is the direct Vishay replacement and is currently in active production.

Q: What is the difference between clamping voltage values in the substitute parts?

A: Clamping voltage represents the maximum voltage across the diode during peak pulse current. The original part specifies 26.9V clamping at 112A. Substitutes with lower clamping voltages (24.4V) at comparable or higher peak currents indicate improved transient suppression efficiency. Higher clamping voltages (32.5V in the STMicroelectronics part) reflect different design characteristics but maintain the same 15V reverse standoff threshold.

Q: Are all substitutes automotive-qualified?

A: The 3KASMC15AHM3_B/I from Vishay and the SMCJ-HR series from Littelfuse carry automotive-grade AEC-Q101 qualification. The MDE Semiconductor 5.0SMDJ15A and STMicroelectronics SMCJ15A-TR are active production parts rated for general-purpose applications. Automotive qualification is not specified for the EVVO Semi SMCJ15A or Diodes Incorporated SMCJ15A-13-F.

Q: Can I use the SMCJ15A (SMA package) as a direct replacement?

A: The SMCJ15A maintains the required voltage parameters but uses DO-214AC (SMA) package instead of DO-214AB (SMC). Physical dimensions differ, requiring PCB footprint modification. Electrical functionality is equivalent for the same voltage class.

Q: What is the significance of the temperature range difference?

A: The original part operates to 185°C junction temperature, supporting extended automotive thermal environments. Substitutes rated to 150°C are suitable for standard automotive applications but may not support extreme underhood conditions. Selection depends on the specific thermal requirements of the application.

Q: Why do peak pulse current values vary significantly among substitutes?

A: Peak pulse current capacity reflects the diode's ability to conduct transient energy. Higher current ratings (205A, 308A) indicate enhanced transient suppression capability and lower clamping voltage under stress. Selection should match the expected transient current magnitude in the protected circuit.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity level, ensuring compatibility with standard manufacturing and storage protocols.

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