3KASMC12HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC12HE3_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 12V reverse standoff voltage and provides 22V maximum clamping voltage at peak pulse current of 136A, delivering 3000W peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KASMC12HE3_A/I
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Package / Case	DO-214AB, SMC
Voltage - Reverse Standoff (Typ)	12V
Voltage - Breakdown (Min)	13.3V
Voltage - Clamping (Max) @ Ipp	22V
Current - Peak Pulse (10/1000µs)	136A
Power - Peak Pulse	3000W
Operating Temperature Range	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 3KASMC12HE3_A/I is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 12V (all substitutes must match)
Voltage - Breakdown (Min): 13.3V (all substitutes must match)
Unidirectional channel configuration (1 channel required)
Type: Zener diode

Mechanical Compatibility Criteria:

Package / Case: DO-214AB, SMC (surface mount form factor)
Mounting Type: Surface Mount

Acceptable Parameter Variations:

Voltage - Clamping (Max) @ Ipp: Substitutes may range from 19.9V to 22V (lower clamping voltage acceptable for transient suppression)
Current - Peak Pulse (10/1000µs): Substitutes with 75.4A to 252A acceptable (higher current rating provides enhanced protection margin)
Power - Peak Pulse: Substitutes with 1500W to 5000W acceptable (higher power dissipation rating acceptable)
Operating Temperature Range: Substitutes with -65°C to -50°C minimum and 150°C to 185°C maximum acceptable
Product Status: Active substitutes preferred over obsolete

Compliance Requirements:

RoHS3 Compliant (mandatory)
MSL 1 (Unlimited) preferred
AEC-Q101 qualification preferred for automotive applications

Parameter Comparison

Parameter	3KASMC12HE3_A/I (Main)	3KASMC12AHE3_B/I	5.0SMDJ12A	SMCJ12A (MDD)	SMCJ12A-HR	SMCJ12A-HRA	SMCJ12A-HRAT7	SMCJ12A-TP
Manufacturer	Vishay	Vishay	HY Electronic	MDD	Littelfuse	Littelfuse	Littelfuse	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	12V	12V	12V	12V	12V	12V	12V	12V
Voltage - Breakdown (Min)	13.3V	13.3V	13.3V	13.3V	13.3V	13.3V	13.3V	13.3V
Voltage - Clamping (Max) @ Ipp	22V	19.9V	19.9V	19.9V	19.9V	19.9V	19.9V	19.9V
Current - Peak Pulse (10/1000µs)	136A	151A	252A	75.4A	75.4A	75.4A	75.4A	75.4A
Power - Peak Pulse	3000W	3000W	5000W	1500W	1500W	1500W	1500W	1500W
Operating Temperature Range	-65°C ~ 185°C	-65°C ~ 185°C	-65°C ~ 150°C	-50°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 175°C
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMCJ	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute (Recommended for Direct Replacement): The 3KASMC12AHE3_B/I from Vishay General Semiconductor - Diodes Division is the primary equivalent. This part maintains identical electrical specifications (12V standoff, 13.3V breakdown minimum, 19.9V clamping maximum) and mechanical compatibility (DO-214AB SMC package). The 3KASMC12AHE3_B/I is active status, ROHS3 compliant, and carries AEC-Q101 automotive qualification matching the original part's grade requirements. Peak pulse current increases from 136A to 151A, providing enhanced transient suppression capability within the same 3000W power dissipation envelope.

Secondary Substitutes (Equivalent Electrical Performance): The SMCJ12A-HR, SMCJ12A-HRA, and SMCJ12A-HRAT7 from Littelfuse Inc. provide equivalent 12V standoff and 13.3V breakdown specifications with 19.9V clamping voltage. These parts are active, ROHS3 compliant, and support the full -65°C to 150°C operating temperature range. Peak pulse current is 75.4A with 1500W power dissipation, representing a reduced protection margin compared to the original 3KASMC12HE3_A/I but remaining suitable for applications where transient energy levels do not exceed 1500W.

Alternative Substitute (Enhanced Protection): The 5.0SMDJ12A from HY Electronic (Cayman) Limited offers enhanced transient suppression with 252A peak pulse current and 5000W power dissipation, maintaining identical 12V standoff and 13.3V breakdown specifications. This part is active and ROHS3 compliant but operates within a reduced temperature range (-65°C to 150°C) compared to the original part's -65°C to 185°C specification.

Lower-Performance Substitute (Cost Optimization): The SMCJ12A-TP from Micro Commercial Co maintains electrical compatibility (12V standoff, 13.3V breakdown, 19.9V clamping) with 75.4A peak pulse current and 1500W power dissipation. This part is active, ROHS3 compliant, and operates across -55°C to 175°C, providing acceptable performance for applications with reduced transient energy requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ12A (MDD) as a direct replacement for 3KASMC12HE3_A/I? A: SMCJ12A (MDD) maintains electrical compatibility with matching 12V standoff and 13.3V breakdown voltages in the DO-214AB SMC package. However, peak pulse current is reduced from 136A to 75.4A, and power dissipation decreases from 3000W to 1500W. This substitute is suitable only for applications where transient energy does not exceed 1500W. Operating temperature range is also reduced to -50°C to 150°C.

Q: What is the difference between 3KASMC12AHE3_B/I and 5.0SMDJ12A? A: Both parts maintain the required 12V standoff and 13.3V breakdown specifications. The 3KASMC12AHE3_B/I provides 151A peak pulse current and 3000W power dissipation with full -65°C to 185°C temperature range. The 5.0SMDJ12A offers higher protection with 252A peak pulse current and 5000W power dissipation but operates only to 150°C maximum junction temperature. Select 3KASMC12AHE3_B/I for applications requiring the full temperature range; select 5.0SMDJ12A for applications requiring maximum transient energy absorption.

Q: Are all substitute parts automotive qualified? A: The 3KASMC12AHE3_B/I carries AEC-Q101 automotive qualification matching the original part. Littelfuse SMCJ12A-HR, SMCJ12A-HRA, and SMCJ12A-HRAT7 are active automotive-grade parts. The SMCJ12A-TP (Micro Commercial Co) and SMCJ12A (MDD) are general-purpose parts without explicit automotive qualification designation in the provided specifications.

Q: Can I use a substitute with lower peak pulse current? A: Substitutes with lower peak pulse current (such as SMCJ12A variants at 75.4A versus the original 136A) are electrically compatible but provide reduced transient suppression capability. Use lower-current substitutes only if circuit analysis confirms that transient energy levels remain within the substitute's 1500W power dissipation limit. For applications requiring the original 3000W or higher protection level, select 3KASMC12AHE3_B/I or 5.0SMDJ12A.

Q: Are all substitutes available in Tape & Reel packaging? A: The 3KASMC12AHE3_B/I, SMCJ12A-HR, SMCJ12A-HRA, SMCJ12A-HRAT7, and SMCJ12A-TP are available in Tape & Reel (TR) packaging suitable for automated assembly. The SMCJ12A (MDD) packaging specification is not explicitly detailed in the provided data.

Q: What is the clamping voltage difference between substitutes? A: All substitutes maintain 19.9V maximum clamping voltage except the original 3KASMC12HE3_A/I at 22V. The 19.9V clamping voltage is acceptable for transient suppression applications and represents a 2.1V reduction from the original specification. This lower clamping voltage may provide slightly faster transient response in some circuit topologies.

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