5KASMC12AHM3/57 Equivalent & Substitute Parts

Part Overview

The 5KASMC12AHM3/57 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates with a 12V reverse standoff voltage and 19.9V maximum clamping voltage, designed for transient overvoltage protection in automotive-grade applications. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KASMC12AHM3/57
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	12V
Voltage - Breakdown (Min)	13.3V
Voltage - Clamping (Max) @ Ipp	19.9V
Power - Peak Pulse	5000W (5kW)
Operating Temperature	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 5KASMC12AHM3/57 is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Voltage - Reverse Standoff: 12V
Voltage - Breakdown (Min): 13.3V
Voltage - Clamping (Max) @ Ipp: 19.9V
Unidirectional Channels: 1
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Power - Peak Pulse: 5000W minimum (higher ratings acceptable)
Current - Peak Pulse (10/1000µs): Higher values acceptable
Operating Temperature: -65°C to 185°C preferred; -50°C to 150°C acceptable for non-automotive applications
Product Status: Active preferred over obsolete

Substitute parts are grouped into two categories:

Group 1 - Direct Vishay Equivalent (Active Status): 5KASMC12AHM3_A/H maintains identical electrical specifications and automotive qualification with active product status and expanded inventory availability.

Group 2 - Cross-Manufacturer Equivalents (Active Status): 5.0SMDJ12A, 5.0SMDJ12A-T7, SMCJ12A, SMCJ12A-HR, SMCJ12A-HRA, and SMCJ12A-HRAT7 meet all critical electrical parameters and package requirements. These parts maintain the 12V standoff, 13.3V breakdown, and 19.9V clamping specifications with DO-214AB/SMC packaging. Variations in peak pulse current (75.4A to 252A) and power dissipation (1500W to 5000W) are acceptable as they represent enhanced or equivalent protection capability.

Parameter Comparison

Parameter	5KASMC12AHM3/57	5KASMC12AHM3_A/H	5.0SMDJ12A	5.0SMDJ12A-T7	SMCJ12A	SMCJ12A-HR	SMCJ12A-HRA	SMCJ12A-HRAT7
Manufacturer	Vishay	Vishay	HY Electronic	Littelfuse	MDD	Littelfuse	Littelfuse	Littelfuse
Voltage - Reverse Standoff (Typ)	12V	12V	12V	12V	12V	12V	12V	12V
Voltage - Breakdown (Min)	13.3V	13.3V	13.3V	13.3V	13.3V	13.3V	13.3V	13.3V
Voltage - Clamping (Max) @ Ipp	19.9V	19.9V	19.9V	19.9V	19.9V	19.9V	19.9V	19.9V
Current - Peak Pulse (10/1000µs)	Not specified	Not specified	252A	252A	75.4A	75.4A	75.4A	75.4A
Power - Peak Pulse	5000W	5000W	5000W	5000W	1500W	1500W	1500W	1500W
Operating Temperature	-65°C ~ 185°C	-65°C ~ 185°C	-65°C ~ 150°C	-65°C ~ 150°C	-50°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Grade	Automotive	Automotive	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
Qualification	AEC-Q101	AEC-Q101	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: 5KASMC12AHM3_A/H

This Vishay part is the direct active equivalent with identical electrical specifications, automotive grade classification, and AEC-Q101 qualification. It maintains the full -65°C to 185°C operating temperature range and 5000W peak pulse power rating. Selection of this part eliminates any technical variance and preserves original design intent. Inventory availability (28,150 pcs) supports production continuity.

Secondary Recommendations for Non-Automotive Applications:

For applications where automotive qualification is not required, 5.0SMDJ12A-T7 (Littelfuse) and SMCJ12A-HRAT7 (Littelfuse) provide active alternatives with identical voltage specifications and DO-214AB/SMC packaging. Both maintain the -65°C to 150°C operating temperature range and ROHS3 compliance.

Tertiary Option for General Purpose Applications:

SMCJ12A (MDD) meets all critical electrical parameters with active product status and high inventory availability (27,540 pcs). Operating temperature range is -50°C to 150°C, suitable for non-automotive general purpose applications. Power dissipation is 1500W, which is acceptable for applications not requiring the full 5000W capability.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ12A as a direct replacement for 5KASMC12AHM3/57 in automotive applications?

A: SMCJ12A meets all critical electrical parameters (12V standoff, 13.3V breakdown, 19.9V clamping) and uses identical DO-214AB/SMC packaging. However, the original part carries automotive grade and AEC-Q101 qualification, while SMCJ12A does not specify these certifications. For automotive applications, 5KASMC12AHM3_A/H is the recommended choice to maintain design compliance.

Q: What is the difference between the 5.0SMDJ12A variants and SMCJ12A variants?

A: Both families maintain identical voltage specifications (12V standoff, 13.3V breakdown, 19.9V clamping) and DO-214AB/SMC packaging. The 5.0SMDJ12A series specifies 252A peak pulse current and 5000W power dissipation, while SMCJ12A specifies 75.4A peak pulse current and 1500W power dissipation. Higher current and power ratings in the 5.0SMDJ12A series provide enhanced transient protection capability.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The original 5KASMC12AHM3/57 is also ROHS3 compliant, ensuring environmental regulation consistency across all alternatives.

Q: What is the significance of the "-T7" suffix in part numbers like 5.0SMDJ12A-T7 and SMCJ12A-HRAT7?

A: The "-T7" suffix indicates Tape & Reel (TR) packaging format, suitable for automated assembly processes. Parts without this suffix may be supplied in alternative packaging formats. Both formats maintain identical electrical specifications and DO-214AB/SMC component packaging.

Q: Can I substitute parts with different operating temperature ranges?

A: The original 5KASMC12AHM3/57 operates from -65°C to 185°C. Substitute parts with -65°C to 150°C ranges are acceptable for applications operating within the -65°C to 150°C window. For applications requiring operation above 150°C, only 5KASMC12AHM3_A/H maintains the full -65°C to 185°C capability.

Q: Is MSL (Moisture Sensitivity Level) consistent across all parts?

A: All listed parts specify MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or assembly processes.

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