3KASMC11HE3_A/H Equivalent & Substitute Parts

Part Overview

The 3KASMC11HE3_A/H is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 11V reverse standoff with 20.1V maximum clamping voltage and 149A peak pulse current. This component is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	11V
Voltage - Breakdown (Min)	12.2V
Voltage - Clamping (Max) @ Ipp	20.1V
Current - Peak Pulse (10/1000µs)	149A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 185°C (TJ)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 11V (exact match required)
Voltage - Breakdown (Min): 12.2V (exact match required)
Voltage - Clamping (Max) @ Ipp: 18.2V to 20.1V (acceptable range)
Current - Peak Pulse (10/1000µs): 82.5A to 165A (acceptable range for 1500W to 3000W power ratings)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Zener, Unidirectional (exact match required)

Substitute parts are grouped into two categories based on power dissipation capability:

Category A (3000W Power Rating): Direct electrical equivalents with identical peak pulse power handling. These parts maintain the original 3000W specification.

Category B (1500W Power Rating): Reduced power dissipation alternatives with lower peak pulse current ratings. These parts are suitable for applications with reduced transient energy requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
3KASMC11HE3_A/H	Vishay General Semiconductor	11V	12.2V	20.1V	149A	3000W	-65°C ~ 185°C	Obsolete
3KASMC11AHE3_B/H	Vishay General Semiconductor	11V	12.2V	18.2V	165A	3000W	-65°C ~ 185°C	Active
SMCJ11A	Fairchild Semiconductor	11V	12.2V	18.2V	82.5A	1500W	-55°C ~ 150°C	Active
SMCJ11A-HRA	Littelfuse Inc.	11V	12.2V	18.2V	82.5A	1500W	-65°C ~ 150°C	Active
SMCJ11A-HRAT7	Littelfuse Inc.	11V	12.2V	18.2V	82.5A	1500W	-65°C ~ 150°C	Active
SMCJ11A-TP	Micro Commercial Co	11V	12.2V	18.2V	82.5A	1500W	-55°C ~ 175°C	Active
SMDJ11A	Alpha & Omega Semiconductor Inc.	11V	12.2V	18.2V	164.9A	3000W	-55°C ~ 150°C	Active
SMDJ11A-HR	Littelfuse Inc.	11V	12.2V	18.2V	164.8A	3000W	-65°C ~ 150°C	Active
SMDJ11A-HRA	Littelfuse Inc.	11V	12.2V	18.2V	164.8A	3000W	-65°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (3000W Category):

The 3KASMC11AHE3_B/H from Vishay General Semiconductor is the preferred direct replacement. It maintains the original manufacturer lineage, identical 3000W power rating, and extended operating temperature range (-65°C ~ 185°C). This part is active and carries ROHS3 compliance and AEC-Q101 automotive qualification matching the original specification.

Alternative 3000W Options:

SMDJ11A-HR and SMDJ11A-HRA from Littelfuse Inc. provide 3000W power dissipation with 164.8A peak pulse current. Both maintain the -65°C lower temperature limit and offer ROHS3 compliance. Operating temperature upper limit is -150°C, which is lower than the original part.

SMDJ11A from Alpha & Omega Semiconductor Inc. delivers 3000W power with 164.9A peak pulse current but operates only to -55°C minimum, reducing low-temperature performance margin.

Reduced Power Alternative (1500W Category):

SMCJ11A-HRA and SMCJ11A-HRAT7 from Littelfuse Inc. are suitable for applications where 1500W peak pulse power is sufficient. Both maintain -65°C minimum operating temperature and ROHS3 compliance. SMCJ11A-TP from Micro Commercial Co extends the upper temperature limit to 175°C but operates only to -55°C minimum.

SMCJ11A from Fairchild Semiconductor and SMCJ11A-TP provide 1500W alternatives with reduced current handling (82.5A peak pulse).

Frequently Asked Questions (FAQ)

Q: Can I use a 1500W rated part to replace the 3000W 3KASMC11HE3_A/H?

A: Only if your application transient energy requirements do not exceed 1500W peak pulse power. The 1500W parts (SMCJ series) have lower peak pulse current ratings (82.5A) compared to the original 149A specification. Application circuit analysis is required to confirm adequacy.

Q: What is the difference between SMCJ11A and SMCJ11A-HRA?

A: Both parts share identical electrical specifications (11V standoff, 18.2V clamping, 82.5A peak pulse, 1500W power). SMCJ11A-HRA extends the minimum operating temperature to -65°C versus -55°C for standard SMCJ11A, and includes ROHS3 compliance certification.

Q: Why does the 3KASMC11AHE3_B/H have lower clamping voltage (18.2V) than the original (20.1V)?

A: Both parts meet the 12.2V minimum breakdown voltage specification. The clamping voltage represents the maximum voltage at peak pulse current. The 18.2V specification is within acceptable operating parameters for 11V standoff TVS diodes and does not indicate incompatibility.

Q: Are all substitute parts in DO-214AB SMC package?

A: Yes. All listed substitute parts use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility with the original 3KASMC11HE3_A/H.

Q: Which substitute part best matches the original operating temperature range?

A: The 3KASMC11AHE3_B/H maintains the -65°C to 185°C range. SMDJ11A-HR and SMDJ11A-HRA extend to -65°C minimum but limit to 150°C maximum. All 1500W alternatives operate within -55°C to 175°C ranges, providing reduced low-temperature performance.

Q: Do all substitute parts have automotive qualification?

A: The 3KASMC11AHE3_B/H carries AEC-Q101 automotive qualification. Littelfuse SMDJ-HR and SMDJ-HRA series parts do not list AEC-Q101 qualification in provided specifications. Fairchild SMCJ11A and Micro Commercial SMCJ11A-TP do not list automotive qualification. Verify qualification requirements for your application.

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