3KASMC15HE3/9AT Equivalent & Substitute Parts

Part Overview

The 3KASMC15HE3/9AT 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 15V reverse standoff voltage and provides 26.9V clamping at peak pulse current, delivering 3000W peak pulse power dissipation across a temperature range of -65°C to 185°C. The part is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance with MSL 1 rating.

The 3KASMC15HE3/9AT is currently listed as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 15V TVS protection.

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
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 3KASMC15HE3/9AT is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 15V and breakdown voltage minimum of 16.7V must be maintained
Clamping Voltage: Maximum clamping voltage at Ipp must not exceed 26.9V to ensure circuit protection integrity
Package Type: Surface mount DO-214AB (SMC) package required for PCB compatibility
Unidirectional Configuration: Single channel unidirectional TVS diode topology
Temperature Range: Operating temperature capability must support the application environment
Compliance: RoHS3 compliance and MSL 1 rating required for automotive and general industrial applications

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (Clamping ≤ 26.9V): SMCJ15AE3/TR13, SMCJ15E3/TR13, SMLJ15A-TP, SMLJ15A, SMDJ15A — these parts maintain clamping voltage at or below the original specification, providing direct functional equivalence.

Group B (Clamping > 26.9V): SMCJ15A-TR, 5.0SMDJ15A — these parts exceed the original clamping voltage specification and are suitable only when circuit design permits higher transient voltage clamping.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Temp Range (°C)	Status
3KASMC15HE3/9AT	Vishay	15	16.7	26.9	112	3000	DO-214AB	-65 to 185	Obsolete
5.0SMDJ15A	MDE Semiconductor	15	16.7	24.4	205	5000	DO-214AB	-55 to 150	Active
SMCJ15A	EVVO Semi	15	16.7	24.4	61.5	600	DO-214AC	-65 to 150	Active
SMCJ15A-TR	STMicroelectronics	15	16.7	32.5	308	1500	DO-214AB	-55 to 150	Active
SMCJ15AE3/TR13	Microchip Technology	15	16.7	24.4	61.5	1500	DO-214AB	-65 to 150	Active
SMCJ15E3/TR13	Microchip Technology	15	16.7	26.9	55.8	1500	DO-214AB	-65 to 150	Active
SMDJ15A	Alpha & Omega Semiconductor	15	16.7	24.4	123	3000	DO-214AB	-55 to 150	Active
SMLJ15A	Bourns Inc.	15	16.7	24.4	123	3000	DO-214AB	-55 to 150	Active
SMLJ15A-TP	Micro Commercial Co	15	16.7	24.4	123	3000	DO-214AB	-55 to 175	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalence)

SMCJ15E3/TR13 (Microchip Technology) and SMLJ15A-TP (Micro Commercial Co) provide the closest functional match to the 3KASMC15HE3/9AT. Both maintain the 26.9V clamping voltage specification, operate in the DO-214AB package, and carry active product status with full RoHS3 compliance. SMCJ15E3/TR13 supports the extended temperature range of -65°C to 150°C, matching the original part's lower temperature limit. SMLJ15A-TP extends to 175°C upper operating temperature, providing additional thermal margin for high-temperature applications.

Secondary Substitutes (Reduced Clamping Voltage)

SMDJ15A (Alpha & Omega Semiconductor) and SMLJ15A (Bourns Inc.) deliver 24.4V clamping voltage with 3000W peak pulse power, matching the original power dissipation specification. These parts are suitable for applications where the lower clamping voltage provides improved transient suppression. Both maintain DO-214AB packaging and RoHS3 compliance with active product status.

Higher Performance Alternative

5.0SMDJ15A (MDE Semiconductor Inc.) offers increased peak pulse current (205A) and power dissipation (5000W) with 24.4V clamping voltage. This part is appropriate for applications requiring enhanced surge protection capability, though the reduced upper operating temperature limit (-55°C to 150°C) must be evaluated against application requirements.

Not Recommended for Direct Substitution

SMCJ15A-TR (STMicroelectronics) exhibits 32.5V clamping voltage, exceeding the original specification by 5.6V. This part is suitable only when circuit design permits higher transient voltage levels. SMCJ15A (EVVO Semi) uses DO-214AC (SMA) package, which differs from the required DO-214AB footprint and is not recommended for direct PCB replacement.

Frequently Asked Questions (FAQ)

Q: Can SMCJ15A-TR be used as a direct replacement for 3KASMC15HE3/9AT?

A: SMCJ15A-TR is not recommended for direct substitution. While both parts share the 15V reverse standoff voltage and DO-214AB package, SMCJ15A-TR clamps at 32.5V compared to the original 26.9V specification. This 5.6V difference may allow excessive transient voltage to reach protected circuitry. Use SMCJ15A-TR only if circuit design analysis confirms compatibility with the higher clamping voltage.

Q: What is the difference between SMLJ15A and SMLJ15A-TP?

A: Both parts are manufactured by different suppliers (Bourns Inc. versus Micro Commercial Co) and share identical electrical specifications: 15V reverse standoff, 24.4V clamping, 123A peak pulse current, and 3000W power dissipation in DO-214AB package. SMLJ15A-TP extends the upper operating temperature to 175°C compared to SMLJ15A at 150°C. Select SMLJ15A-TP for applications requiring higher temperature operation.

Q: Why does 5.0SMDJ15A have higher peak pulse power than the original part?

A: 5.0SMDJ15A delivers 5000W peak pulse power versus 3000W for the original part, resulting from its higher peak pulse current rating (205A versus 112A). This increased capability provides enhanced transient suppression for high-energy surge events. The lower clamping voltage (24.4V) improves circuit protection. However, the reduced upper operating temperature limit (-55°C to 150°C) must be evaluated for your application environment.

Q: Is the DO-214AB package identical across all substitute parts?

A: All recommended substitute parts use the DO-214AB (SMC) package, ensuring PCB footprint compatibility. SMCJ15A (EVVO Semi) uses DO-214AC (SMA) package, which has different pin spacing and is not mechanically compatible with DO-214AB footprints. Verify package designation before component selection.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance certification. Moisture sensitivity level is MSL 1 (Unlimited) across all parts, matching the original specification and eliminating special handling requirements during storage and assembly.

Q: What is the temperature range consideration for automotive applications?

A: The original 3KASMC15HE3/9AT operates from -65°C to 185°C with AEC-Q101 automotive qualification. Most substitute parts operate to -55°C minimum and 150°C maximum, representing a narrower range. For automotive applications requiring the full -65°C to 185°C range, SMCJ15E3/TR13 and SMLJ15A-TP provide the best temperature coverage at -65°C to 150°C and -55°C to 175°C respectively. Evaluate application temperature requirements before final selection.

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