3KASMC14HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC14HE3_A/I is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 14V reverse standoff with a 25.8V maximum clamping voltage. This component is designed for surface mount applications in the DO-214AB (SMC) package and operates across an automotive temperature range of -65°C to 185°C. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KASMC14HE3_A/I
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	14V
Voltage - Breakdown (Min)	15.6V
Voltage - Clamping (Max) @ Ipp	25.8V
Current - Peak Pulse (10/1000µs)	116A
Power - Peak Pulse	3000W (3kW)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 3KASMC14HE3_A/I is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 14V
Voltage - Breakdown (Min): 15.6V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: Substitute parts range from 23.2V to 25.8V, representing acceptable clamping performance within the 14V protection class
Current - Peak Pulse (10/1000µs): Substitute parts range from 64.66A to 216A, indicating different power handling capabilities while maintaining the same voltage class
Power - Peak Pulse: Substitute parts range from 1500W to 5000W, correlating with peak pulse current ratings
Operating Temperature: Substitute parts operate within -55°C to -65°C minimum and 150°C to 185°C maximum, with some variants offering extended automotive temperature ranges

All identified substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and EAR99 ECCN classification consistent with the original part.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status
3KASMC14HE3_A/I	Vishay General Semiconductor	14V	15.6V	25.8V	116A	3000W	DO-214AB (SMCJ)	-65°C ~ 185°C	Obsolete
3KASMC14AHE3_B/I	Vishay General Semiconductor	14V	15.6V	23.2V	129A	3000W	DO-214AB (SMC)	-65°C ~ 185°C	Active
5.0SMDJ14A	MDE Semiconductor Inc	14V	15.6V	23.2V	216A	5000W	DO-214AB (SMCJ)	-55°C ~ 150°C	Active
SMCJ14A	Meritek	14V	15.6V	23.2V	64.66A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	Active
SMCJ14A-13-F	Diodes Incorporated	14V	15.6V	23.2V	64.7A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	Active
SMCJ14A-HR	Littelfuse Inc.	14V	15.6V	23.2V	64.7A	1500W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMCJ14A-HRA	Littelfuse Inc.	14V	15.6V	23.2V	64.7A	1500W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMCJ14A-HRAT7	Littelfuse Inc.	14V	15.6V	23.2V	64.7A	1500W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMDJ14A	Alpha & Omega Semiconductor Inc.	14V	15.6V	23.2V	129.4A	3000W	DO-214AB (SMC)	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): The 3KASMC14AHE3_B/I from Vishay General Semiconductor is the primary direct replacement. This part maintains identical voltage specifications (14V reverse standoff, 15.6V breakdown minimum, 23.2V clamping maximum), equivalent power rating (3000W), and extends the same automotive temperature range (-65°C to 185°C). Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. The primary difference is a marginal increase in peak pulse current (129A versus 116A), which represents improved performance within the same electrical class.

Secondary Alternatives (Equivalent Voltage Class, Different Power Ratings): For applications where the full 3000W power rating is not required, the SMCJ14A variants from Meritek, Diodes Incorporated, and Littelfuse Inc. provide functionally equivalent 14V protection with reduced power dissipation (1500W). These parts are suitable for lower-energy transient suppression scenarios. The Littelfuse SMCJ14A-HR, SMCJ14A-HRA, and SMCJ14A-HRAT7 variants maintain the extended automotive temperature range (-65°C to 150°C), providing better thermal performance than standard industrial variants.

High-Performance Alternative: The 5.0SMDJ14A from MDE Semiconductor Inc. and SMDJ14A from Alpha & Omega Semiconductor Inc. offer enhanced peak pulse current handling (216A and 129.4A respectively) with 3000W or 5000W power ratings. These parts are suitable for applications requiring superior transient suppression capability. Note that these alternatives operate within a reduced temperature range (-55°C to 150°C), which may not satisfy extended automotive specifications.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and EAR99 ECCN classification. Selection should prioritize parts with active product status and established supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower peak pulse current rating than the original 3KASMC14HE3_A/I?

A: Yes, if your application does not require the full 116A peak pulse current capability. The SMCJ14A variants rated at 64.66A to 64.7A provide equivalent voltage protection (14V standoff, 15.6V breakdown, 23.2V clamping) and are suitable for lower-energy transient events. However, verify that your circuit's maximum transient current does not exceed the substitute part's rating.

Q: What is the difference between the 23.2V clamping voltage of substitute parts and the original 25.8V clamping voltage?

A: Both values fall within the acceptable clamping range for 14V protection class TVS diodes. The 23.2V clamping voltage of substitute parts represents tighter voltage regulation, which may provide superior protection in some applications. The original 25.8V clamping is within normal manufacturing tolerance for this device class. Selection depends on your circuit's specific voltage suppression requirements.

Q: Are the Littelfuse SMCJ14A-HR, SMCJ14A-HRA, and SMCJ14A-HRAT7 parts interchangeable?

A: These three Littelfuse variants share identical electrical specifications (14V standoff, 15.6V breakdown, 23.2V clamping, 64.7A peak pulse, 1500W power) and package (DO-214AB SMCJ). The suffix designations (-HR, -HRA, -HRAT7) indicate different packaging or tape configurations. Verify packaging compatibility with your assembly process before selection.

Q: Can I use the 5.0SMDJ14A in an automotive application requiring -65°C operation?

A: No. The 5.0SMDJ14A operates within -55°C to 150°C, which does not meet the extended automotive temperature range of the original part (-65°C to 185°C). For automotive applications requiring full temperature range coverage, select the 3KASMC14AHE3_B/I or Littelfuse SMCJ14A variants (SMCJ14A-HR, SMCJ14A-HRA, SMCJ14A-HRAT7).

Q: Do all substitute parts maintain AEC-Q101 automotive qualification?

A: The 3KASMC14AHE3_B/I explicitly carries AEC-Q101 qualification. Other substitute parts do not list AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 certification, the 3KASMC14AHE3_B/I is the recommended choice.

Q: What is the impact of selecting a substitute part with higher peak pulse current capability?

A: Higher peak pulse current capability (such as the 5.0SMDJ14A at 216A or SMDJ14A at 129.4A) provides improved transient suppression performance and margin for higher-energy events. This does not negatively impact lower-energy applications; the device will suppress transients within its rated capability. Verify that the substitute part's package and thermal characteristics are compatible with your PCB layout and thermal management strategy.

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