Equivalent & Substitute Parts for 3KASMC16AHM3_A/H

Part Overview

The 3KASMC16AHM3_A/H is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 16V reverse standoff with 28.8V clamping voltage. This component is classified as Obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The part operates across the automotive temperature range (-65°C to 185°C) and carries AEC-Q101 qualification with ROHS3 compliance.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	16V
Voltage - Breakdown (Min)	17.8V
Voltage - Clamping (Max) @ Ipp	28.8V
Current - Peak Pulse (10/1000µs)	104A
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

Substitute Part Grouping Explanation

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

Voltage Rating: Reverse standoff voltage of 16V and breakdown minimum of 17.8V must be maintained
Clamping Voltage: Maximum clamping voltage at Ipp must not exceed 28.8V to ensure circuit protection integrity
Peak Pulse Current: Minimum 104A capability required for transient suppression
Power Dissipation: Minimum 3000W peak pulse power rating
Package Compatibility: DO-214AB (SMC) surface mount package for PCB layout compatibility
Compliance: ROHS3 compliance and automotive-grade qualification preferred for equivalent substitution

The substitute parts identified fall into two categories: direct equivalents maintaining all electrical parameters, and functional alternatives with enhanced performance characteristics that remain within acceptable operating margins.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temperature	Product Status
3KASMC16AHM3_A/H	Vishay General Semiconductor	16V	28.8V	104A	3000W	DO-214AB, SMC	-65°C ~ 185°C	Obsolete
3KASMC16AHM3_B/H	Vishay General Semiconductor	16V	26V	115A	3000W	DO-214AB, SMC	-65°C ~ 185°C	Active
5.0SMDJ16A	Taiwan Semiconductor Corporation	16V	26V	193A	5000W	DO-214AB, SMC	-55°C ~ 175°C	Active
SMCJ16A-HR	Littelfuse Inc.	16V	26V	57.7A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ16A-HRA	Littelfuse Inc.	16V	26V	57.7A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ16A-HRAT7	Littelfuse Inc.	16V	26V	57.7A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
SMCJ16A-TP	Micro Commercial Co	16V	26V	57.7A	1500W	DO-214AB, SMC	-55°C ~ 175°C	Active
SMDJ16A	Alpha & Omega Semiconductor Inc.	16V	26V	115.4A	3000W	DO-214AB, SMC	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Recommendation: 3KASMC16AHM3_B/H

The 3KASMC16AHM3_B/H from Vishay General Semiconductor is the direct successor to the obsolete 3KASMC16AHM3_A/H. This part maintains identical voltage ratings, package configuration, and automotive qualification (AEC-Q101). The clamping voltage is reduced to 26V, providing improved transient suppression performance. Current capability increases to 115A, and the part is currently in Active production status with ROHS3 compliance maintained.

Secondary Recommendation: SMDJ16A

The SMDJ16A from Alpha & Omega Semiconductor Inc. provides equivalent electrical performance with 115.4A peak pulse current and 3000W power dissipation matching the original specification. This part maintains the 16V voltage rating and DO-214AB package compatibility. Operating temperature range extends to -55°C minimum, suitable for most industrial and automotive applications.

Alternative for Enhanced Performance: 5.0SMDJ16A

The 5.0SMDJ16A from Taiwan Semiconductor Corporation offers superior transient suppression capability with 193A peak pulse current and 5000W power dissipation. This part is suitable for applications requiring higher energy absorption. The 26V clamping voltage and 16V standoff rating remain compatible with the original circuit design intent.

Consideration for Power-Limited Applications: SMCJ16A-TP

The SMCJ16A-TP from Micro Commercial Co provides a lower-power alternative at 1500W peak pulse dissipation with 57.7A current capability. This part is suitable for applications where the original 3000W specification exceeds circuit requirements. Operating temperature range of -55°C to 175°C covers standard industrial temperature bands.

Frequently Asked Questions (FAQ)

Q: Can the 3KASMC16AHM3_B/H directly replace the obsolete 3KASMC16AHM3_A/H?

A: Yes. Both parts share identical voltage ratings (16V standoff, 17.8V breakdown minimum), the same DO-214AB SMC package, and automotive-grade AEC-Q101 qualification. The 3KASMC16AHM3_B/H is the active production equivalent with improved clamping voltage (26V vs 28.8V) and higher peak pulse current (115A vs 104A).

Q: What is the significance of clamping voltage differences between substitute parts?

A: Clamping voltage determines the maximum voltage transient that reaches the protected circuit. Lower clamping voltages provide better protection. The original 28.8V specification is exceeded by all active substitutes at 26V or lower, representing improved circuit protection performance.

Q: Are all substitute parts automotive-qualified?

A: The 3KASMC16AHM3_B/H carries AEC-Q101 qualification matching the original part. The SMDJ16A and 5.0SMDJ16A are active production parts suitable for automotive applications. The Littelfuse SMCJ16A variants and Micro Commercial SMCJ16A-TP are general-purpose rated but ROHS3 compliant and suitable for industrial applications.

Q: Does package compatibility extend to all substitute parts?

A: All identified substitutes use the DO-214AB (SMC) surface mount package, ensuring direct PCB footprint compatibility. No layout modifications are required for mechanical placement.

Q: What is the temperature range consideration for substitute selection?

A: The original part operates -65°C to 185°C. Most substitutes operate within -55°C to 175°C ranges. For applications requiring the full -65°C to 185°C range, the 3KASMC16AHM3_B/H is the appropriate selection.

Q: Can higher-rated parts like 5.0SMDJ16A be used in place of lower-rated alternatives?

A: Yes. Higher peak pulse current and power dissipation ratings provide enhanced transient suppression capability without degrading circuit performance. The 5.0SMDJ16A with 193A and 5000W is suitable for any application originally specified for 104A and 3000W.

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