3KASMC17AHM3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC17AHM3_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 a 17V reverse standoff voltage and provides 30.5V maximum clamping voltage at peak pulse current of 98.4A, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and operates across -65°C to 185°C junction temperature range. As this part carries obsolete product status, equivalent and substitute parts with active availability are necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	18.9	V
Voltage - Clamping (Max) @ Ipp	30.5	V
Current - Peak Pulse (10/1000µs)	98.4	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC17AHM3_A/I is determined by the following critical parameters:

Voltage - Reverse Standoff: 17V (exact match required)
Voltage - Breakdown (Min): 18.9V (exact match required)
Voltage - Clamping (Max) @ Ipp: 27.6V to 30.5V (acceptable range)
Current - Peak Pulse (10/1000µs): 54.4A minimum (equal or greater)
Power - Peak Pulse: 1500W minimum (equal or greater)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)
RoHS Status: ROHS3 Compliant (required)

Substitute parts are grouped into two categories: direct manufacturer equivalents from Vishay with active product status, and manufacturer-recommended alternatives from qualified suppliers (Taiwan Semiconductor Corporation, Littelfuse Inc., Fairchild Semiconductor, EVVO Semi) that meet or exceed the electrical performance specifications while maintaining package and compliance compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
3KASMC17AHM3_A/I	Vishay	17	18.9	30.5	98.4	3000	-65 to 185	DO-214AB, SMC	Obsolete
3KASMC17AHM3_B/I	Vishay	17	18.9	27.6	109	3000	-65 to 185	DO-214AB, SMC	Active
5.0SMDJ17A	Taiwan Semiconductor Corporation	17	18.9	27.6	181	5000	-55 to 175	DO-214AB, SMC	Active
5.0SMDJ17A-T7	Littelfuse Inc.	17	18.9	27.6	181	5000	-65 to 150	DO-214AB, SMC	Active
SMCJ16A	EVVO Semi	16	17.8	26	57.7	600	-65 to 150	DO-214AC, SMA	Active
SMCJ17A	Fairchild Semiconductor	17	18.9	27.6	54.4	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ17A-HR	Littelfuse Inc.	17	18.9	27.6	54.4	1500	-65 to 150	DO-214AB, SMC	Active
SMCJ17A-HRA	Littelfuse Inc.	17	18.9	27.6	54.4	1500	-65 to 150	DO-214AB, SMC	Active
SMCJ17A-HRAT7	Littelfuse Inc.	17	18.9	27.6	54.4	1500	-65 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

Primary Substitute (Direct Equivalent): 3KASMC17AHM3_B/I from Vishay General Semiconductor - Diodes Division maintains identical voltage specifications (17V reverse standoff, 18.9V breakdown minimum, 27.6V clamping maximum) and package configuration (DO-214AB, SMC) while offering improved peak pulse current (109A versus 98.4A) and active product status. This part carries the same AEC-Q101 automotive qualification and ROHS3 compliance as the original, with extended temperature range support (-65°C to 185°C).

High-Performance Alternatives: The 5.0SMDJ17A (Taiwan Semiconductor Corporation) and 5.0SMDJ17A-T7 (Littelfuse Inc.) provide enhanced power dissipation (5000W versus 3000W) and significantly higher peak pulse current (181A), maintaining identical voltage parameters and DO-214AB, SMC package compatibility. These parts are suitable for applications requiring additional thermal margin or higher transient energy absorption.

Standard-Performance Alternatives: SMCJ17A variants from Fairchild Semiconductor and Littelfuse Inc. (SMCJ17A-HR, SMCJ17A-HRA, SMCJ17A-HRAT7) deliver equivalent voltage specifications with 1500W power dissipation and 54.4A peak pulse current. Littelfuse variants maintain the full automotive temperature range (-65°C to 150°C), while Fairchild's offering operates -55°C to 150°C.

Not Recommended: SMCJ16A from EVVO Semi does not meet substitution criteria due to reduced reverse standoff voltage (16V versus 17V required), different package type (DO-214AC, SMA versus DO-214AB, SMC), and significantly lower power rating (600W versus 3000W minimum).

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ16A as a substitute for 3KASMC17AHM3_A/I?

A: No. SMCJ16A operates at 16V reverse standoff voltage, which does not meet the 17V requirement of the original part. Additionally, it uses a different package (DO-214AC, SMA) and provides only 600W power dissipation, insufficient for this application.

Q: What is the difference between 3KASMC17AHM3_A/I and 3KASMC17AHM3_B/I?

A: Both parts share identical voltage specifications (17V reverse standoff, 18.9V breakdown minimum, 27.6V clamping maximum) and package type (DO-214AB, SMC). The primary differences are peak pulse current (109A for _B/I versus 98.4A for _A/I) and product status (Active for _B/I versus Obsolete for _A/I). The _B/I variant is the recommended direct replacement.

Q: Are the Littelfuse SMCJ17A-HR, SMCJ17A-HRA, and SMCJ17A-HRAT7 parts interchangeable?

A: These three Littelfuse parts share identical electrical specifications (17V reverse standoff, 27.6V clamping maximum, 54.4A peak pulse current, 1500W power dissipation) and package configuration (DO-214AB, SMC). The designations reflect different packaging formats and tape configurations. They are electrically equivalent for circuit design purposes.

Q: Why do some substitute parts have lower peak pulse current than the original?

A: SMCJ17A variants (54.4A) and SMCJ16A (57.7A) provide lower peak pulse current than the original 3KASMC17AHM3_A/I (98.4A). These parts are suitable only for applications where the circuit's transient energy requirements do not exceed their specified ratings. For applications requiring the full 98.4A capability, use 3KASMC17AHM3_B/I, 5.0SMDJ17A, or 5.0SMDJ17A-T7.

Q: Do all substitute parts meet automotive qualification requirements?

A: The 3KASMC17AHM3_B/I carries AEC-Q101 automotive qualification. The 5.0SMDJ17A and 5.0SMDJ17A-T7 do not list automotive grade designation in provided specifications. SMCJ17A variants from Fairchild and Littelfuse do not specify automotive qualification in provided data. Verify automotive compliance requirements with your design specifications before selection.

Q: What is the temperature range difference between substitute options?

A: The original 3KASMC17AHM3_A/I and its direct equivalent 3KASMC17AHM3_B/I operate -65°C to 185°C. The 5.0SMDJ17A operates -55°C to 175°C (reduced range). Littelfuse SMCJ17A variants operate -65°C to 150°C (lower maximum). Fairchild SMCJ17A operates -55°C to 150°C (most restricted). Select based on your application's thermal requirements.

Q: Can I use a higher power-rated part as a substitute?

A: Yes. Parts with equal or greater power dissipation and peak pulse current ratings can be used provided all voltage specifications (reverse standoff, breakdown minimum, clamping maximum) match exactly and the package type is identical. The 5.0SMDJ17A and 5.0SMDJ17A-T7 (5000W) exceed the original 3000W rating and are suitable for applications requiring additional thermal margin.

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