3KASMC16AHM3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC16AHM3_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 16V reverse standoff voltage and provides 28.8V clamping at peak pulse current, delivering 3000W peak pulse power dissipation across an operating temperature range of -65°C to 185°C. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant with MSL 1 rating.

The 3KASMC16AHM3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers, offering comparable electrical performance with variations in peak pulse current ratings and power dissipation capabilities.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	16	V
Voltage - Breakdown (Min)	17.8	V
Voltage - Clamping (Max) @ Ipp	28.8	V
Current - Peak Pulse (10/1000µs)	104	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC16AHM3_A/I is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 16V (all substitutes must match)
Voltage - Breakdown (Min): 17.8V (all substitutes must match)
Unidirectional Channels: 1 (all substitutes must match)
Package / Case: DO-214AB, SMC (primary requirement for PCB compatibility)
Type: Zener (all substitutes must match)
Mounting Type: Surface Mount (all substitutes must match)

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

Category A - Direct Electrical Equivalents (3000W Power Rating):

3KASMC16AHM3_B/I (Vishay, 26V clamp, 115A Ipp)
SMDJ16A (Alpha & Omega Semiconductor, 26V clamp, 115.4A Ipp)

Category B - Enhanced Performance Substitutes (Higher Power or Current Ratings):

5.0SMDJ16A (Taiwan Semiconductor Corporation, 5000W rating, 193A Ipp)
SMCJ16A-HR (Littelfuse, 1500W rating, 57.7A Ipp)
SMCJ16A-HRA (Littelfuse, 1500W rating, 57.7A Ipp)
SMCJ16A-HRAT7 (Littelfuse, 1500W rating, 57.7A Ipp)
SMCJ16A-TP (Micro Commercial Co, 1500W rating, 57.7A Ipp)
SMCJ16A (EVVO Semi, 600W rating, 57.7A Ipp)

All listed substitutes maintain the required 16V reverse standoff voltage, 17.8V minimum breakdown voltage, and unidirectional single-channel configuration. Variations in clamping voltage (26V vs. 28.8V), peak pulse current, and power dissipation reflect different manufacturer designs within the same voltage class.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
3KASMC16AHM3_A/I	Vishay	16V	17.8V	28.8V	104A	3000W	DO-214AB, SMC	-65 to 185°C	Obsolete
3KASMC16AHM3_B/I	Vishay	16V	17.8V	26V	115A	3000W	DO-214AB, SMC	-65 to 185°C	Active
5.0SMDJ16A	Taiwan Semiconductor	16V	17.8V	26V	193A	5000W	DO-214AB, SMC	-55 to 175°C	Active
SMCJ16A-HR	Littelfuse	16V	17.8V	26V	57.7A	1500W	DO-214AB, SMC	-65 to 150°C	Active
SMCJ16A-HRA	Littelfuse	16V	17.8V	26V	57.7A	1500W	DO-214AB, SMC	-65 to 150°C	Active
SMCJ16A-HRAT7	Littelfuse	16V	17.8V	26V	57.7A	1500W	DO-214AB, SMC	-65 to 150°C	Active
SMCJ16A-TP	Micro Commercial Co	16V	17.8V	26V	57.7A	1500W	DO-214AB, SMC	-55 to 175°C	Active
SMDJ16A	Alpha & Omega Semiconductor	16V	17.8V	26V	115.4A	3000W	DO-214AB, SMC	-55 to 150°C	Active
SMCJ16A	EVVO Semi	16V	17.8V	26V	57.7A	600W	DO-214AC, SMA	-65 to 150°C	Active

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

The 3KASMC16AHM3_B/I (Vishay) is the most direct substitute. It maintains the same manufacturer lineage, automotive-grade qualification (AEC-Q101), identical operating temperature range (-65°C to 185°C), and equivalent 3000W power dissipation. The part is currently in active production status with 789 units in stock. The clamping voltage reduction from 28.8V to 26V and current increase from 104A to 115A represent improved performance characteristics within the same voltage class.

Secondary Recommendations for Enhanced Performance:

The SMDJ16A (Alpha & Omega Semiconductor) provides 3000W power dissipation with 115.4A peak pulse current, matching the electrical performance tier of the 3KASMC16AHM3_B/I. This part is active with 1884 units in stock.

The 5.0SMDJ16A (Taiwan Semiconductor Corporation) offers enhanced power dissipation at 5000W with 193A peak pulse current, suitable for applications requiring higher transient energy absorption. Operating temperature range is -55°C to 175°C.

Lower Power Alternatives:

The SMCJ16A-HR, SMCJ16A-HRA, SMCJ16A-HRAT7 (Littelfuse), and SMCJ16A-TP (Micro Commercial Co) provide 1500W power dissipation with 57.7A peak pulse current. These parts are suitable for applications with reduced transient energy requirements. All are active with adequate inventory.

Package Compatibility Note:

The SMCJ16A (EVVO Semi) uses DO-214AC (SMA) package instead of DO-214AB (SMC), requiring PCB layout modification. This part is not recommended for direct board-level substitution without design revision.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 3KASMC16AHM3_A/I with any of the listed parts without circuit modification?

A: Yes, all listed parts except SMCJ16A (EVVO Semi) maintain the DO-214AB (SMC) package and can be substituted at the board level. The SMCJ16A uses a different package (DO-214AC, SMA) and requires PCB layout changes.

Q: What is the difference between the 28.8V clamping voltage of the original part and the 26V clamping voltage of most substitutes?

A: The clamping voltage is the maximum voltage across the diode during transient suppression. The 26V clamping voltage of substitute parts provides slightly lower voltage clamping compared to the original 28.8V specification. Both values fall within the same voltage class (16V standoff) and are suitable for 16V circuit protection applications.

Q: Why do some substitutes have lower power ratings (1500W or 600W) compared to the original 3000W?

A: Lower power-rated parts are suitable for applications with reduced transient energy levels. If your circuit requires the full 3000W dissipation capability, select substitutes with matching or higher power ratings: 3KASMC16AHM3_B/I, SMDJ16A, or 5.0SMDJ16A.

Q: Is the 5.0SMDJ16A with 5000W power rating a direct substitute?

A: The 5.0SMDJ16A is electrically compatible and maintains the required voltage specifications and DO-214AB package. However, its operating temperature range (-55°C to 175°C) is narrower than the original part (-65°C to 185°C). Use this part only if your application operates within the -55°C to 175°C range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant. All maintain MSL 1 (Unlimited) moisture sensitivity level, matching the original part's environmental specifications.

Q: What is the inventory status of recommended substitutes?

A: The 3KASMC16AHM3_B/I has 789 units in stock. The SMDJ16A has 1884 units. The 5.0SMDJ16A has 9400 units. The Littelfuse SMCJ16A variants (HR, HRA, HRAT7) have between 958 and 1099 units each. The SMCJ16A-TP has 4064 units. The EVVO Semi SMCJ16A has 607,624 units in stock.

Q: Can I use the SMCJ16A-TP as a substitute if my application operates at -65°C?

A: The SMCJ16A-TP has an operating temperature range of -55°C to 175°C. If your application requires operation at -65°C, this part is not suitable. Use the 3KASMC16AHM3_B/I, SMCJ16A-HR, SMCJ16A-HRA, or SMCJ16A (EVVO Semi) instead, which all support -65°C operation.

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