3KASMC24HE3_A/H Equivalent & Substitute Parts

Part Overview

The 3KASMC24HE3_A/H is a 24V unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a DO-214AB (SMC) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part delivers 43V clamping voltage at peak pulse current of 69.8A with 3000W peak pulse power rating, suitable for transient protection applications in automotive-grade systems.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	24V
Voltage - Breakdown (Min)	26.7V
Voltage - Clamping (Max) @ Ipp	43V
Current - Peak Pulse (10/1000µs)	69.8A
Power - Peak Pulse	3000W
Operating Temperature Range	-65°C ~ 185°C (TJ)
Package / Case	DO-214AB, SMC
RoHS Status	ROHS3 Compliant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the 3KASMC24HE3_A/H is determined by the following critical parameters:

Voltage - Reverse Standoff: 24V (all substitutes maintain this specification)
Voltage - Breakdown (Min): 26.7V (all substitutes maintain this specification)
Package / Case: DO-214AB, SMC (all substitutes use compatible surface mount packages)
Unidirectional Channels: 1 (all substitutes are unidirectional)
RoHS Status: ROHS3 Compliant (all substitutes meet this requirement)

Substitute parts are grouped into two categories based on clamping voltage and peak pulse current characteristics:

Group A (43V Clamping): Parts matching the original 43V clamping voltage specification with 69.8A peak pulse current.

Group B (38.9V Clamping): Parts with lower clamping voltage (38.9V) but higher peak pulse current ratings (77.1A to 129A), offering enhanced transient suppression capability.

Group C (51V Clamping): Parts with higher clamping voltage (51V) and significantly higher peak pulse current (520A at 8/20µs), suitable for applications requiring maximum surge protection.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	Grade	Qualification
3KASMC24HE3_A/H	Vishay	24V	43V	69.8A	3000W	-65°C ~ 185°C	Obsolete	Automotive	AEC-Q101
3KASMC24AHE3_B/H	Vishay	24V	38.9V	77.1A	3000W	-65°C ~ 185°C	Active	Automotive	AEC-Q101
SMLJ24E3/TR13	Microchip Technology	24V	43V	69.8A	300W	-55°C ~ 150°C	Active	-	-
1SMC24A TR13 PBFREE	Central Semiconductor Corp	24V	38.9V	38.6A	1500W	-65°C ~ 150°C	Active	-	-
3.0SMC24A	Littelfuse Inc.	24V	51V	520A (8/20µs)	-	-65°C ~ 150°C	Active	-	-
3.0SMCJ24A-13	Diodes Incorporated	24V	38.9V	77.1A	3000W	-55°C ~ 175°C	Active	-	-
3SMC24A TR13 PBFREE	Central Semiconductor Corp	24V	38.9V	77.2A	3000W	-65°C ~ 150°C	Active	-	-
4.0SMDJ24A	Littelfuse Inc.	24V	38.9V	103A	4000W	-55°C ~ 150°C	Active	-	-
5.0SMDJ24A	Taiwan Semiconductor Corporation	24V	38.9V	129A	5000W	-55°C ~ 175°C	Active	-	-
SM30T28AY	STMicroelectronics	24V	38.9V	77.1A	3000W	-55°C ~ 175°C	Active	Automotive	AEC-Q101
SMC30J24A	STMicroelectronics	24V	38.9V	77A	3000W	-55°C ~ 175°C	Active	-	-

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

The 3KASMC24AHE3_B/H (Vishay) is the primary direct replacement. It maintains automotive grade qualification and AEC-Q101 certification while offering active product status. The SM30T28AY (STMicroelectronics) provides an alternative with automotive grade and AEC-Q101 qualification, with extended upper operating temperature to 175°C.

For General Purpose Applications:

The 3.0SMCJ24A-13 (Diodes Incorporated) and 3SMC24A TR13 PBFREE (Central Semiconductor Corp) are suitable alternatives with active status and 3000W power rating matching the original specification. Both maintain the 24V reverse standoff and 26.7V minimum breakdown voltage.

For Enhanced Transient Protection:

The 4.0SMDJ24A (Littelfuse Inc.) and 5.0SMDJ24A (Taiwan Semiconductor Corporation) provide higher peak pulse current ratings (103A and 129A respectively) with increased power dissipation capability (4000W and 5000W), suitable for applications requiring superior surge suppression.

For Maximum Surge Current Handling:

The 3.0SMC24A (Littelfuse Inc.) offers 520A peak pulse current at 8/20µs pulse width, providing maximum transient suppression for high-energy surge environments.

Temperature Range Considerations:

The original part operates to 185°C junction temperature. Substitutes with lower maximum operating temperatures (-55°C ~ 150°C) may require thermal analysis in high-temperature applications. The SM30T28AY and 5.0SMDJ24A extend to 175°C, providing closer thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 3KASMC24AHE3_B/H directly replace the 3KASMC24HE3_A/H?

A: Yes. Both parts maintain identical reverse standoff voltage (24V), minimum breakdown voltage (26.7V), and package specification (DO-214AB, SMC). The 3KASMC24AHE3_B/H is active production status with automotive grade and AEC-Q101 qualification, making it the recommended direct replacement.

Q: What is the difference between 43V clamping and 38.9V clamping specifications?

A: The clamping voltage is the maximum voltage across the diode at peak pulse current. Lower clamping voltage (38.9V) provides tighter voltage regulation but requires higher peak pulse current handling. The 43V clamping parts (SMLJ24E3/TR13) match the original specification exactly.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's environmental compliance requirements.

Q: Which substitute offers the best thermal performance?

A: The SM30T28AY (STMicroelectronics) and 5.0SMDJ24A (Taiwan Semiconductor Corporation) both extend to 175°C maximum junction temperature, compared to the original 185°C. For applications requiring the original 185°C capability, the 3KASMC24AHE3_B/H maintains this specification.

Q: Can I use a higher power-rated part as a substitute?

A: Yes, provided the voltage specifications (24V reverse standoff, 26.7V minimum breakdown) and package (DO-214AB, SMC) remain unchanged. Higher power-rated parts (4.0SMDJ24A at 4000W, 5.0SMDJ24A at 5000W) provide enhanced transient suppression without compromising circuit compatibility.

Q: What is the significance of the 10/1000µs pulse specification?

A: This defines the peak pulse current rating under a specific transient waveform: 10µs rise time and 1000µs pulse width. This standardized test condition allows direct comparison of surge suppression capability across different manufacturers' TVS diodes.

Q: Are Central Semiconductor Corp parts suitable for automotive applications?

A: The 1SMC24A TR13 PBFREE and 3SMC24A TR13 PBFREE are active production parts with general purpose classification. They lack automotive grade and AEC-Q101 qualification. Use these only in non-automotive applications or where automotive qualification is not required.

Q: How does the 3.0SMC24A differ from other substitutes?

A: The 3.0SMC24A (Littelfuse Inc.) features significantly higher peak pulse current (520A at 8/20µs) and higher clamping voltage (51V). This part is designed for maximum surge protection in high-energy transient environments, making it suitable for applications with severe electrical stress conditions.

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