3KASMC13AHM3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC13AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is rated for 13V reverse standoff voltage with a 21.5V maximum clamping voltage and 140A peak pulse current capability. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued circuit protection applications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	13V
Voltage - Breakdown (Min)	14.4V
Voltage - Clamping (Max) @ Ipp	21.5V
Current - Peak Pulse (10/1000µs)	140A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 185°C (TJ)
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC13AHM3_A/I is determined by the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 13V, breakdown minimum of 14.4V, and clamping voltage maximum of 21.5V must be maintained
Package Compatibility: DO-214AB / SMC surface mount package required for PCB footprint alignment
Current Handling: Peak pulse current capability of 140A or greater ensures adequate transient suppression
Power Dissipation: Peak pulse power rating of 3000W or greater maintains thermal performance
Mounting Type: Surface mount configuration for automated assembly compatibility
Compliance: ROHS3 compliance and MSL 1 rating required for manufacturing and storage

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Thermal Equivalents (140A+ Peak Pulse Current) Parts maintaining the original 140A peak pulse current specification and 3000W+ power rating, ensuring identical transient suppression performance.

Category B - Functional Equivalents with Enhanced Performance (69.7A-233A Peak Pulse Current) Parts with reduced or increased peak pulse current ratings but identical voltage parameters. These provide functional voltage suppression within the same package, though with different current handling characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temp Range	Product Status
3KASMC13AHM3_A/I	Vishay	13V	14.4V	21.5V	140A	3000W	DO-214AB (SMCJ)	-65°C ~ 185°C	Obsolete
3KASMC13AHM3_B/I	Vishay	13V	14.4V	21.5V	140A	3000W	DO-214AB (SMC)	-65°C ~ 185°C	Active
SMC30J13A	STMicroelectronics	13V	14.4V	21.5V	140A	3000W	DO-214AB (SMC)	-55°C ~ 175°C	Active
5.0SMDJ13A	MDE Semiconductor Inc	13V	14.4V	21.5V	233A	5000W	DO-214AB (SMCJ)	-55°C ~ 150°C	Active
SMCJ13A	ANBON SEMICONDUCTOR	13V	14.4V	21.5V	69.7A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	Active
SMCJ13A-HR	Littelfuse Inc.	13V	14.4V	21.5V	69.8A	1500W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMCJ13A-HRA	Littelfuse Inc.	13V	14.4V	21.5V	69.8A	1500W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMCJ13A-HRAT7	Littelfuse Inc.	13V	14.4V	21.5V	69.8A	1500W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMCJ13A-TP	Micro Commercial Co	13V	14.4V	21.5V	69.8A	1500W	DO-214AB (SMC)	-55°C ~ 175°C	Active

Engineering Selection Recommendations

Primary Recommendation: 3KASMC13AHM3_B/I

The 3KASMC13AHM3_B/I is the direct successor to the obsolete 3KASMC13AHM3_A/I. Both parts are manufactured by Vishay and share identical electrical specifications: 13V reverse standoff, 14.4V breakdown minimum, 21.5V clamping maximum, 140A peak pulse current, and 3000W peak pulse power. The primary difference is packaging format (Tape & Reel versus bulk), making this the optimal replacement for direct substitution. Product status is active with established supply availability.

Secondary Recommendation: SMC30J13A

The SMC30J13A from STMicroelectronics maintains all critical voltage and current parameters identical to the original part. Operating temperature range is -55°C to 175°C, which is narrower than the original -65°C to 185°C specification but remains suitable for most industrial applications. This part is active with high inventory availability (3508 units).

Enhanced Performance Alternative: 5.0SMDJ13A

The 5.0SMDJ13A from MDE Semiconductor Inc provides identical voltage specifications with enhanced current handling (233A peak pulse) and power dissipation (5000W). This part is suitable for applications requiring higher transient energy absorption. Operating temperature range is -55°C to 150°C.

Reduced Current Alternatives: SMCJ13A Series

Parts including SMCJ13A (ANBON), SMCJ13A-HR, SMCJ13A-HRA, SMCJ13A-HRAT7 (Littelfuse), and SMCJ13A-TP (Micro Commercial Co) maintain identical voltage specifications but with reduced peak pulse current (69.7A-69.8A) and power dissipation (1500W). These are suitable only for applications with lower transient current requirements. All are active products with established supply chains.

All recommended substitutes are ROHS3 compliant with MSL 1 rating, maintaining manufacturing and storage compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ13A-HR as a direct replacement for 3KASMC13AHM3_A/I?

A: SMCJ13A-HR maintains identical voltage specifications (13V reverse standoff, 21.5V clamping) and package format (DO-214AB SMCJ). However, peak pulse current is reduced from 140A to 69.8A, and power dissipation is reduced from 3000W to 1500W. Substitution is valid only if circuit transient current requirements do not exceed 69.8A.

Q: What is the difference between 3KASMC13AHM3_A/I and 3KASMC13AHM3_B/I?

A: Both parts are electrically identical with matching voltage ratings, current specifications, and operating temperature ranges. The primary difference is packaging: 3KASMC13AHM3_A/I is supplied in bulk packaging, while 3KASMC13AHM3_B/I is supplied in Tape & Reel format for automated assembly. The 3KASMC13AHM3_B/I is the active product.

Q: Why does 5.0SMDJ13A have higher current and power ratings?

A: The 5.0SMDJ13A is designed for applications requiring greater transient energy absorption. Peak pulse current is 233A and power dissipation is 5000W compared to the original 140A and 3000W. Voltage specifications remain identical, making it suitable for higher-stress transient suppression applications within the same package footprint.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with current manufacturing processes and storage requirements.

Q: What is the operating temperature difference between substitutes?

A: The original 3KASMC13AHM3_A/I operates from -65°C to 185°C. Most active substitutes operate from -55°C to 150°C or -55°C to 175°C. For applications requiring the full -65°C to 185°C range, 3KASMC13AHM3_B/I and SMCJ13A-HR maintain the -65°C lower limit.

Q: Can I use SMC30J13A in automotive applications?

A: The original 3KASMC13AHM3_A/I carries automotive grade qualification (AEC-Q101). SMC30J13A does not list automotive qualification in the provided specifications. Substitution for automotive applications requires verification of SMC30J13A automotive compliance status with STMicroelectronics.

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