3KASMC24HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC24HE3_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 (SMCJ) package. This component operates with a 24V reverse standoff voltage and provides 43V maximum clamping voltage at peak pulse current of 69.8A, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and operates across the temperature range of -65°C to 185°C.

The 3KASMC24HE3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers with active product status, offering comparable or enhanced electrical performance while maintaining compatibility with the original design specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	26.7	V
Voltage - Clamping (Max) @ Ipp	43	V
Current - Peak Pulse (10/1000µs)	69.8	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 3KASMC24HE3_A/I is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 24V
Voltage - Breakdown (Min): 26.7V
Unidirectional Channels: 1
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 43V (allowable range based on circuit protection requirements)
Current - Peak Pulse (10/1000µs): 69.8A (minimum threshold for adequate transient suppression)
Power - Peak Pulse: 3000W (minimum dissipation capability)
Operating Temperature Range: -65°C to 185°C (or compatible subset)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A - Matched Clamping Voltage (38.9V to 43V): Parts with clamping voltages within the original specification range, suitable for direct replacement without circuit redesign.

Group B - Enhanced Power Dissipation (4000W to 5000W): Parts with higher peak pulse power ratings, providing additional margin for transient energy absorption while maintaining compatible voltage characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
3KASMC24HE3_A/I	Vishay General Semiconductor - Diodes Division	24V	26.7V	43V	69.8A	3000W	-65 to 185°C	DO-214AB, SMC	Obsolete
3KASMC24AHE3_B/I	Vishay General Semiconductor - Diodes Division	24V	26.7V	38.9V	77.1A	3000W	-65 to 185°C	DO-214AB, SMC	Active
SMLJ24E3/TR13	Microchip Technology	24V	26.7V	43V	69.8A	300W	-55 to 150°C	DO-214AB, SMC	Active
1SMC24A TR13 PBFREE	Central Semiconductor Corp	24V	26.7V	38.9V	38.6A	1500W	-65 to 150°C	DO-214AB, SMC	Active
3.0SMC24A	Littelfuse Inc.	24V	26.7V	51V	520A (8/20µs)	—	-65 to 150°C	DO-214AB, SMC	Active
3.0SMCJ24A-13	Diodes Incorporated	24V	26.7V	38.9V	77.1A	3000W	-55 to 175°C	DO-214AB, SMC	Active
3SMC24A TR13 PBFREE	Central Semiconductor Corp	24V	26.7V	38.9V	77.2A	3000W	-65 to 150°C	DO-214AB, SMC	Active
4.0SMDJ24A	Littelfuse Inc.	24V	26.7V	38.9V	103A	4000W	-55 to 150°C	DO-214AB, SMC	Active
5.0SMDJ24A	Taiwan Semiconductor Corporation	24V	26.7V	38.9V	129A	5000W	-55 to 175°C	DO-214AB, SMC	Active
SM30T28AY	STMicroelectronics	24V	26.7V	38.9V	77.1A	3000W	-55 to 175°C	DO-214AB, SMC	Active
SMC30J24A	STMicroelectronics	24V	26.7V	38.9V	77A	3000W	-55 to 175°C	DO-214AB, SMC	Active

Engineering Selection Recommendations

Direct Replacement (Matched Electrical Performance):

The 3KASMC24AHE3_B/I from Vishay General Semiconductor - Diodes Division is the primary direct replacement. This part maintains the same manufacturer lineage, identical reverse standoff voltage (24V), breakdown voltage (26.7V), and equivalent power dissipation (3000W). The clamping voltage is 38.9V compared to the original 43V, representing a 9.4% reduction that remains within acceptable transient suppression margins for most 24V circuit protection applications. Operating temperature range extends to 185°C, matching the original specification. Product status is Active with full AEC-Q101 automotive qualification.

Functionally Equivalent Alternatives (Group A - 38.9V Clamping):

The following parts provide equivalent protection with 38.9V clamping voltage and 3000W power dissipation:

3.0SMCJ24A-13 (Diodes Incorporated): Active status, -55 to 175°C operating range, 77.1A peak pulse current
3SMC24A TR13 PBFREE (Central Semiconductor Corp): Active status, -65 to 150°C operating range, 77.2A peak pulse current
SM30T28AY (STMicroelectronics): Active status, AEC-Q101 automotive qualification, -55 to 175°C operating range, 77.1A peak pulse current
SMC30J24A (STMicroelectronics): Active status, -55 to 175°C operating range, 77A peak pulse current

Enhanced Power Dissipation Alternatives (Group B - 4000W to 5000W):

For applications requiring additional transient energy margin:

4.0SMDJ24A (Littelfuse Inc.): 4000W peak pulse power, 103A peak pulse current, -55 to 150°C operating range
5.0SMDJ24A (Taiwan Semiconductor Corporation): 5000W peak pulse power, 129A peak pulse current, -55 to 175°C operating range

Limited Compatibility Options:

The following parts have reduced performance specifications and are suitable only for applications with lower transient energy requirements:

1SMC24A TR13 PBFREE (Central Semiconductor Corp): 1500W power dissipation, 38.6A peak pulse current
SMLJ24E3/TR13 (Microchip Technology): 300W power dissipation (significantly reduced), 69.8A peak pulse current, -55 to 150°C operating range
3.0SMC24A (Littelfuse Inc.): 51V clamping voltage (elevated), 520A peak pulse current (8/20µs pulse definition differs from 10/1000µs standard)

Compliance and Certification Considerations:

For automotive applications requiring AEC-Q101 qualification, select from:

3KASMC24AHE3_B/I (Vishay)
SM30T28AY (STMicroelectronics)

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 3KASMC24AHE3_B/I replace the 3KASMC24HE3_A/I directly without circuit modification?

A: Yes. Both parts share identical reverse standoff voltage (24V), breakdown voltage (26.7V), and power dissipation (3000W). The clamping voltage difference (38.9V vs. 43V) represents a 9.4% reduction that remains within acceptable protection margins for standard 24V transient suppression circuits. The part is from the same manufacturer with equivalent automotive qualification.

Q: What is the difference between the 10/1000µs and 8/20µs pulse definitions for peak pulse current?

A: These represent different test waveform standards. The 10/1000µs waveform (used by most parts listed) defines a faster rise time and longer pulse duration compared to the 8/20µs waveform. Peak current values are not directly comparable between these standards. The 3.0SMC24A uses the 8/20µs standard and should not be selected based on its 520A rating without confirming circuit compatibility with this pulse definition.

Q: Are all substitute parts available in the same DO-214AB (SMC) package?

A: Yes. All listed substitute parts are specified for DO-214AB or SMC package designation, ensuring mechanical and thermal compatibility with the original design. Verify specific packaging options (Tape & Reel, Cut Tape, or Bulk) with your supplier based on procurement requirements.

Q: Which substitute part offers the best thermal performance for high-temperature applications?

A: The 3KASMC24AHE3_B/I maintains the original -65 to 185°C operating range. For applications limited to lower maximum temperatures, the 3.0SMCJ24A-13, SM30T28AY, and SMC30J24A all operate to 175°C. The 1SMC24A TR13 PBFREE and SMLJ24E3/TR13 are limited to 150°C maximum junction temperature.

Q: What is the advantage of selecting a higher power-rated part like the 5.0SMDJ24A?

A: Higher power-rated parts (4000W and 5000W) provide additional margin for transient energy absorption, reducing junction temperature rise during suppression events. This extends component lifetime and provides design margin for applications with uncertain or variable transient energy levels. However, circuit protection performance remains equivalent at the 24V standoff voltage and 26.7V breakdown voltage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original 3KASMC24HE3_A/I specification.

Q: Which manufacturers offer the most extensive inventory of 24V TVS diodes in this package?

A: Based on provided inventory data, Taiwan Semiconductor Corporation (5.0SMDJ24A: 300,200 pcs), Littelfuse Inc. (3.0SMC24A: 6,795 pcs), and Diodes Incorporated (3.0SMCJ24A-13: 4,400 pcs) maintain the largest stock levels. Vishay (3KASMC24AHE3_B/I: 14,400 pcs) also provides substantial availability.

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