3KASMC11AHM3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC11AHM3_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 (SMC) package. This component operates with an 11V reverse standoff voltage and provides 18.2V maximum clamping voltage at peak pulse current of 165A, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and operates across the temperature range of -65°C to 185°C.

The 3KASMC11AHM3_A/I is currently listed as obsolete. Equivalent substitute parts are available from multiple manufacturers with identical or comparable electrical specifications, ensuring design continuity and supply chain flexibility.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	11V
Voltage - Breakdown (Min)	12.2V
Voltage - Clamping (Max) @ Ipp	18.2V
Current - Peak Pulse (10/1000µs)	165A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Operating Temperature Range	-65°C ~ 185°C (TJ)
Type	Zener, Unidirectional
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC11AHM3_A/I is determined by the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 11V, breakdown voltage minimum of 12.2V, and clamping voltage maximum of 18.2V
Package Compatibility: DO-214AB (SMC) surface mount package
Peak Pulse Current: Minimum 165A capability at 10/1000µs pulse profile
Peak Pulse Power: Minimum 3000W dissipation capacity
Unidirectional Configuration: Single channel TVS diode topology

Substitute parts are grouped into two categories based on peak pulse current and power ratings:

Category A - Full Specification Match (165A+, 3000W):

3KASMC11AHM3_B/I (Vishay, Active status)
SMDJ11A (Alpha & Omega Semiconductor Inc.)
SMDJ11A-HR (Littelfuse Inc.)
SMDJ11A-HRA (Littelfuse Inc.)

Category B - Reduced Specification (82.5A, 1500W):

SMCJ11A (Fairchild Semiconductor)
SMCJ11A-HRA (Littelfuse Inc.)
SMCJ11A-HRAT7 (Littelfuse Inc.)
SMCJ11A-TP (Micro Commercial Co)

Category A parts maintain identical electrical performance. Category B parts provide reduced peak pulse current and power ratings; selection requires application-level current demand verification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temp Range	Product Status
3KASMC11AHM3_A/I	Vishay	11V	18.2V	165A	3000W	DO-214AB (SMC)	-65°C ~ 185°C	Obsolete
3KASMC11AHM3_B/I	Vishay	11V	18.2V	165A	3000W	DO-214AB (SMC)	-65°C ~ 185°C	Active
SMDJ11A	Alpha & Omega Semiconductor Inc.	11V	18.2V	164.9A	3000W	DO-214AB (SMC)	-55°C ~ 150°C	Active
SMDJ11A-HR	Littelfuse Inc.	11V	18.2V	164.8A	3000W	DO-214AB (SMC)	-65°C ~ 150°C	Active
SMDJ11A-HRA	Littelfuse Inc.	11V	18.2V	164.8A	3000W	DO-214AB (SMC)	-65°C ~ 150°C	Active
SMCJ11A	Fairchild Semiconductor	11V	18.2V	82.5A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	Active
SMCJ11A-HRA	Littelfuse Inc.	11V	18.2V	82.5A	1500W	DO-214AB (SMC)	-65°C ~ 150°C	Active
SMCJ11A-HRAT7	Littelfuse Inc.	11V	18.2V	82.5A	1500W	DO-214AB (SMC)	-65°C ~ 150°C	Active
SMCJ11A-TP	Micro Commercial Co	11V	18.2V	82.5A	1500W	DO-214AB (SMC)	-55°C ~ 175°C	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: 3KASMC11AHM3_B/I is the direct successor from Vishay, maintaining identical electrical specifications, automotive AEC-Q101 qualification, and extended temperature range (-65°C to 185°C). This part is currently in active production status with 1106 units in stock.

Full Specification Alternatives (165A, 3000W Category): SMDJ11A, SMDJ11A-HR, and SMDJ11A-HRA from Alpha & Omega Semiconductor Inc. and Littelfuse Inc. provide equivalent peak pulse current and power ratings. These parts are ROHS3 compliant and actively produced. Temperature range varies: SMDJ11A operates -55°C to 150°C, while SMDJ11A-HR and SMDJ11A-HRA extend to -65°C to 150°C.

Reduced Specification Alternatives (82.5A, 1500W Category): SMCJ11A series parts from Fairchild Semiconductor, Littelfuse Inc., and Micro Commercial Co provide identical voltage ratings and package compatibility but with 50% reduction in peak pulse current and power dissipation. These parts are suitable only for applications where peak transient current does not exceed 82.5A. SMCJ11A-TP from Micro Commercial Co offers the widest operating temperature range (-55°C to 175°C).

All substitute parts maintain ROHS3 compliance and DO-214AB (SMC) package compatibility for direct PCB footprint replacement.

Frequently Asked Questions (FAQ)

Q: Can SMCJ11A series parts directly replace 3KASMC11AHM3_A/I? A: SMCJ11A series parts are electrically compatible for voltage ratings but provide only 82.5A peak pulse current versus the original 165A specification. Direct replacement is only valid if the application's transient current demand does not exceed 82.5A. Peak pulse power is reduced from 3000W to 1500W.

Q: What is the difference between 3KASMC11AHM3_A/I and 3KASMC11AHM3_B/I? A: Both parts are identical in electrical specifications and package. The primary difference is product status: 3KASMC11AHM3_A/I is obsolete, while 3KASMC11AHM3_B/I is active production. The suffix change from _A/I to _B/I indicates packaging configuration variation (Tape & Reel for _B/I versus bulk for _A/I).

Q: Are all substitute parts automotive qualified? A: The original 3KASMC11AHM3_A/I carries AEC-Q101 automotive qualification. Among substitutes, 3KASMC11AHM3_B/I maintains this qualification. Other manufacturers' parts (SMDJ11A, SMCJ11A series) do not list AEC-Q101 qualification in the provided specifications. Automotive applications requiring AEC-Q101 certification should prioritize 3KASMC11AHM3_B/I or verify qualification status with manufacturers.

Q: What is the temperature range difference impact? A: The original part operates -65°C to 185°C. SMDJ11A-HR and SMDJ11A-HRA operate -65°C to 150°C, providing equivalent low-temperature performance but reduced maximum junction temperature. SMCJ11A-TP operates -55°C to 175°C, limiting low-temperature operation by 10°C but extending high-temperature capability by 10°C. Application thermal requirements determine suitability.

Q: Can I use SMDJ11A-HR in place of SMDJ11A? A: Yes. Both parts provide identical electrical specifications (11V standoff, 18.2V clamping, 164.8A peak pulse, 3000W power). SMDJ11A-HR is the Littelfuse high-reliability variant with extended temperature range (-65°C to 150°C) and ROHS3 compliance. The HR designation indicates enhanced reliability screening.

Q: What packaging options are available? A: All substitute parts use DO-214AB (SMC) surface mount package, ensuring identical PCB footprint compatibility. Packaging configurations vary: 3KASMC11AHM3_B/I is supplied in Tape & Reel; SMCJ11A from Fairchild is supplied in Bulk; Littelfuse variants (SMCJ11A-HRA, SMCJ11A-HRAT7, SMDJ11A-HR, SMDJ11A-HRA) are supplied in Tape & Reel; SMCJ11A-TP from Micro Commercial Co is supplied in Tape & Reel.

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