Equivalent & Substitute Parts for 3KASMC10HE3_A/I

Part Overview

The 3KASMC10HE3_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 10V reverse standoff voltage and provides 18.8V clamping at peak pulse current, delivering 3000W peak pulse power for transient suppression in automotive-grade applications.

The 3KASMC10HE3_A/I is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	10V
Voltage - Breakdown (Min)	11.1V
Voltage - Clamping (Max) @ Ipp	18.8V
Current - Peak Pulse (10/1000µs)	160A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Operating Temperature	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC10HE3_A/I is determined by the following critical parameters:

Voltage - Reverse Standoff: 10V (exact match required)
Voltage - Breakdown (Min): 11.1V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Type: Zener, Unidirectional (exact match required)
Mounting Type: Surface Mount (exact match required)
RoHS Status: ROHS3 Compliant (minimum requirement)

Substitute parts are grouped into two categories based on electrical performance:

Category A - Direct Electrical Equivalents (3000W Peak Pulse Power): Parts with matching 3000W peak pulse power rating and clamping voltage within the operational range of the original design.

Category B - Functional Equivalents (1500W Peak Pulse Power): Parts with reduced peak pulse power (1500W) but matching voltage parameters. These are suitable for applications where the full 3000W capability is not required.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status
3KASMC10HE3_A/I	Vishay	10V	18.8V	160A	3000W	-65°C ~ 185°C	Obsolete
3KASMC10AHE3_B/I	Vishay	10V	17V	177A	3000W	-65°C ~ 185°C	Active
SMDJ10A	Alpha & Omega Semiconductor Inc.	10V	17V	176.5A	3000W	-55°C ~ 150°C	Active
SMDJ10A-HR	Littelfuse Inc.	10V	17V	176.5A	3000W	-65°C ~ 150°C	Active
SMCJ10A-HR	Littelfuse Inc.	10V	17V	88.3A	1500W	-65°C ~ 150°C	Active
SMCJ10A-HRA	Littelfuse Inc.	10V	17V	88.3A	1500W	-65°C ~ 150°C	Active
SMCJ10A-HRAT7	Littelfuse Inc.	10V	17V	88.3A	1500W	-65°C ~ 150°C	Active
SMCJ10A-TP	Micro Commercial Co	10V	17V	88.3A	1500W	-55°C ~ 175°C	Active
SMCJ10A	Meritek	10V	17V	88.24A	1500W	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (Category A):

The 3KASMC10AHE3_B/I from Vishay is the preferred direct replacement. It maintains the same manufacturer lineage, automotive grade qualification, AEC-Q101 certification, and 3000W peak pulse power rating. The part is active and in stock. The clamping voltage is reduced from 18.8V to 17V, which is within acceptable operational parameters for the 10V standoff voltage class.

Alternative Options - Direct Electrical Equivalents (Category A):

SMDJ10A-HR from Littelfuse Inc. provides equivalent 3000W peak pulse power with matching voltage parameters and extended temperature range (-65°C ~ 150°C). This part carries AEC-Q101 qualification and is suitable for automotive applications.

SMDJ10A from Alpha & Omega Semiconductor Inc. offers 3000W peak pulse power with matching voltage specifications. Temperature range is -55°C ~ 150°C. This part is active and widely available.

Secondary Options - Functional Equivalents (Category B):

SMCJ10A-TP, SMCJ10A-HR, SMCJ10A-HRA, and SMCJ10A-HRAT7 are suitable for applications where peak pulse power requirements do not exceed 1500W. All maintain the 10V reverse standoff voltage and 17V clamping voltage. These parts are active and in stock.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. Parts from Littelfuse (SMDJ10A-HR, SMCJ10A series) maintain the extended lower temperature limit of -65°C, matching the original design specification.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ10A-TP as a direct replacement for 3KASMC10HE3_A/I?

A: SMCJ10A-TP is functionally compatible but with reduced peak pulse power (1500W vs. 3000W). It maintains the same 10V reverse standoff voltage, 17V clamping voltage, and DO-214AB package. Use this part only if your application does not require the full 3000W peak pulse capability.

Q: What is the difference between the 3KASMC10AHE3_B/I and SMDJ10A-HR?

A: Both are 3000W rated parts with matching voltage parameters. The 3KASMC10AHE3_B/I is from Vishay (same manufacturer as the original), while SMDJ10A-HR is from Littelfuse. The 3KASMC10AHE3_B/I is the preferred choice for design continuity. SMDJ10A-HR is an alternative with equivalent electrical performance.

Q: Why is the clamping voltage lower in substitute parts (17V vs. 18.8V)?

A: The clamping voltage variation is within the acceptable range for 10V standoff voltage class TVS diodes. Both values provide effective transient suppression. The 17V clamping voltage is a standard specification for this voltage class and does not compromise circuit protection.

Q: Are all substitute parts automotive-grade?

A: The Vishay 3KASMC10AHE3_B/I and Littelfuse SMDJ10A-HR and SMCJ10A series carry automotive grade designation with AEC-Q101 qualification. Meritek SMCJ10A and Alpha & Omega SMDJ10A are general-purpose rated. Verify automotive qualification requirements for your specific application.

Q: Can I mix different substitute parts in the same design?

A: All listed parts are pin-compatible in the DO-214AB package and electrically interchangeable within their respective power rating categories. However, maintain consistency within a single production run to ensure uniform transient suppression performance.

Q: What is the impact of operating temperature range differences?

A: The original part operates to 185°C junction temperature. Most substitutes are rated to 150°C. If your application requires operation above 150°C, verify thermal management and consider the 3KASMC10AHE3_B/I or SMCJ10A-TP, which extend to 175°C.

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