3KASMC15HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC15HE3_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 (SMCJ) package. This component operates with a 15V reverse standoff voltage and provides 26.9V maximum clamping voltage at peak pulse current of 112A, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and operates across -65°C to 185°C junction temperature range. The 3KASMC15HE3_A/I is currently listed as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

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	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 3KASMC15HE3_A/I is determined by the following critical parameters:

Voltage Parameters: Reverse standoff voltage of 15V and breakdown voltage minimum of 16.7V must be maintained. Clamping voltage at peak pulse current may vary within acceptable design margins.

Current and Power Ratings: Peak pulse current (10/1000µs) and peak pulse power dissipation establish the device's transient suppression capability. Substitutes must meet or exceed the original 112A / 3000W specification to ensure equivalent protection.

Package Compatibility: The DO-214AB (SMC) surface mount package is the primary mechanical constraint. Substitutes in alternative packages (DO-214AC/SMA, DO-214AB with different designations) require PCB layout verification.

Temperature Range: Operating temperature range of -65°C to 185°C is specified for the original part. Substitutes with reduced upper temperature limits (-55°C or -65°C minimum) may be acceptable depending on application thermal requirements.

Compliance and Qualification: AEC-Q101 automotive qualification and ROHS3 compliance are specified for the original part. Active substitutes should maintain equivalent compliance status.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
3KASMC15HE3_A/I	Vishay General Semiconductor	15	26.9	112	3000	-65 to 185	DO-214AB (SMCJ)	Obsolete
3KASMC15AHE3_B/I	Vishay General Semiconductor	15	24.4	123	3000	-65 to 185	DO-214AB (SMC)	Active
5.0SMDJ15A	MDE Semiconductor Inc	15	24.4	205	5000	-55 to 150	DO-214AB (SMCJ)	Active
SMCJ15A	EVVO Semi	15	24.4	61.5	600	-65 to 150	DO-214AC (SMA)	Active
SMCJ15A-13-F	Diodes Incorporated	15	24.4	61.5	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ15A-HRA	Littelfuse Inc.	15	24.4	61.5	1500	-65 to 150	DO-214AB (SMCJ)	Active
SMCJ15A-HRAT7	Littelfuse Inc.	15	24.4	61.5	1500	-65 to 150	DO-214AB (SMCJ)	Active
SMCJ15A-TR	STMicroelectronics	15	32.5	308 (8/20µs)	1500	-55 to 150	DO-214AB (SMC)	Active
SMDJ15A	Alpha & Omega Semiconductor Inc.	15	24.4	123	3000	-55 to 150	DO-214AB	Active

Engineering Selection Recommendations

Primary Substitute - Direct Replacement: The 3KASMC15AHE3_B/I from Vishay General Semiconductor is the direct manufacturer equivalent. It maintains the same 15V reverse standoff voltage, identical 3000W peak pulse power rating, and superior peak pulse current of 123A compared to the original 112A. The clamping voltage is reduced to 24.4V, which provides improved transient suppression performance. This part is active and available in tape & reel packaging.

High-Performance Alternative: The 5.0SMDJ15A from MDE Semiconductor Inc. exceeds the original specifications with 205A peak pulse current and 5000W peak pulse power dissipation. This part is suitable for applications requiring enhanced transient protection margin. Operating temperature range is reduced to -55°C to 150°C, which may limit use in extreme cold environments.

Package-Compatible Alternatives: The SMCJ15A-HRA and SMCJ15A-HRAT7 from Littelfuse Inc. maintain the DO-214AB (SMCJ) package and -65°C to 150°C operating range. Both deliver 1500W peak pulse power with 61.5A peak pulse current. These parts are suitable for applications where the original 3000W specification can be reduced without compromising circuit protection.

Lower-Power Alternatives: The SMCJ15A-13-F from Diodes Incorporated and SMCJ15A from EVVO Semi provide 1500W and 600W peak pulse power respectively. These are applicable only in applications with reduced transient energy requirements. The EVVO Semi part uses DO-214AC (SMA) package, requiring PCB layout modification.

Specification Variance Consideration: The SMCJ15A-TR from STMicroelectronics exhibits higher clamping voltage (32.5V) and uses 8/20µs pulse measurement versus the standard 10/1000µs. This part is suitable only when higher clamping voltage is acceptable in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ15A-13-F as a direct replacement for 3KASMC15HE3_A/I? A: The SMCJ15A-13-F maintains the 15V reverse standoff voltage and DO-214AB (SMC) package. However, peak pulse power is reduced from 3000W to 1500W. Substitution is valid only if the application transient energy does not exceed 1500W. Verify circuit protection requirements before selection.

Q: What is the difference between 3KASMC15AHE3_B/I and 3KASMC15HE3_A/I? A: Both parts share the same manufacturer (Vishay), voltage rating (15V), and power dissipation (3000W). The 3KASMC15AHE3_B/I is the active production equivalent with improved peak pulse current (123A vs. 112A) and lower clamping voltage (24.4V vs. 26.9V). The original part is obsolete.

Q: Can I substitute a part with DO-214AC (SMA) package for DO-214AB (SMC)? A: No. These are different physical packages with different footprints. The SMCJ15A in DO-214AC (SMA) package requires PCB layout redesign and cannot be used as a direct drop-in replacement without circuit board modification.

Q: Does operating temperature range affect substitution compatibility? A: Yes. The original part operates to 185°C junction temperature. Most active substitutes are limited to 150°C. If the application requires operation above 150°C, only the 3KASMC15AHE3_B/I from Vishay maintains the extended temperature range. Verify thermal requirements before selection.

Q: What is the significance of peak pulse current rating differences? A: Peak pulse current determines the maximum transient current the TVS diode can suppress. The original 3KASMC15HE3_A/I handles 112A. Substitutes with higher ratings (123A, 205A, 308A) provide additional protection margin. Substitutes with lower ratings (61.5A) reduce protection capability and are suitable only for lower-energy transient environments.

Q: Are all listed substitutes RoHS3 compliant? A: Yes. All substitute parts listed are RoHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity level, matching the original part's environmental compliance status.

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