Equivalent & Substitute Parts for 3KASMC24AHE3_A/I

Part Overview

The 3KASMC24AHE3_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 (SMC) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across an automotive temperature range with AEC-Q101 qualification and provides 3000W peak pulse power dissipation at 24V reverse standoff voltage.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KASMC24AHE3_A/I
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AB, SMC
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	24V
Voltage - Breakdown (Min)	26.7V
Voltage - Clamping (Max) @ Ipp	38.9V
Current - Peak Pulse (10/1000µs)	77.1A
Power - Peak Pulse	3000W
Operating Temperature	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 3KASMC24AHE3_A/I are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 24V
Voltage - Breakdown (Min): 26.7V
Voltage - Clamping (Max) @ Ipp: 38.9V
Current - Peak Pulse (10/1000µs): 77.1A ± tolerance
Power - Peak Pulse: 3000W
Package / Case: DO-214AB, SMC
Type: Zener, Unidirectional
Mounting Type: Surface Mount

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
Product Status: Active (preferred for new designs)

Substitute parts maintain identical or equivalent electrical performance within the specified voltage and current ratings. All qualified substitutes are surface mount components in the DO-214AB SMC package with automotive-grade specifications where applicable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Grade	Qualification
3KASMC24AHE3_A/I	Vishay General Semiconductor - Diodes Division	24V	26.7V	38.9V	77.1A	3000W	-65°C ~ 185°C	Obsolete	Automotive	AEC-Q101
3KASMC24AHE3_B/I	Vishay General Semiconductor - Diodes Division	24V	26.7V	38.9V	77.1A	3000W	-65°C ~ 185°C	Active	Automotive	AEC-Q101
3.0SMCJ24A-13	Diodes Incorporated	24V	26.7V	38.9V	77.1A	3000W	-55°C ~ 175°C	Active	-	-
SM30T28AY	STMicroelectronics	24V	26.7V	38.9V	77.1A	3000W	-55°C ~ 175°C	Active	Automotive	AEC-Q101
SMDJ24A	Alpha & Omega Semiconductor Inc.	24V	26.7V	38.9V	77.2A	3000W	-55°C ~ 150°C	Active	-	-
SMDJ24A-HR	Littelfuse Inc.	24V	26.7V	38.9V	77.1A	3000W	-65°C ~ 150°C	Active	-	-
SMDJ24A-HRA	Littelfuse Inc.	24V	26.7V	38.9V	77.1A	3000W	-65°C ~ 150°C	Active	-	-
TPSMD24A	Littelfuse Inc.	24V	26.7V	38.9V	77.1A	3000W	-65°C ~ 150°C	Active	Automotive	AEC-Q101
1SMC24A TR13 PBFREE	Central Semiconductor Corp	24V	26.7V	38.9V	38.6A	1500W	-65°C ~ 150°C	Active	-	-
3.0SMC24A	Littelfuse Inc.	24V	26.7V	51V	520A (8/20µs)	-	-65°C ~ 150°C	Active	-	-
3SMC24A TR13 PBFREE	Central Semiconductor Corp	24V	26.7V	38.9V	77.2A	3000W	-65°C ~ 150°C	Active	-	-

Engineering Selection Recommendations

Primary Substitutes (Full Electrical & Compliance Match):

3KASMC24AHE3_B/I is the direct active equivalent from Vishay, maintaining identical electrical specifications and automotive AEC-Q101 qualification. This part differs only in product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard packaging).

TPSMD24A from Littelfuse provides full electrical equivalence with automotive-grade AEC-Q101 qualification, matching the original part's temperature range (-65°C ~ 150°C) and all critical voltage and current parameters.

SM30T28AY from STMicroelectronics delivers equivalent electrical performance with automotive AEC-Q101 qualification, though operating temperature is limited to -55°C ~ 175°C.

Secondary Substitutes (Electrical Match with Reduced Temperature Range):

SMDJ24A-HR and SMDJ24A-HRA from Littelfuse maintain full electrical equivalence but operate within -65°C ~ 150°C, which is narrower than the original -65°C ~ 185°C specification.

SMDJ24A from Alpha & Omega Semiconductor provides electrical equivalence with peak pulse current of 77.2A and operates within -55°C ~ 150°C.

3SMC24A TR13 PBFREE from Central Semiconductor Corp matches electrical specifications with 77.2A peak pulse current and -65°C ~ 150°C operating range.

Limited Substitutes (Reduced Performance):

1SMC24A TR13 PBFREE from Central Semiconductor Corp provides 24V standoff voltage but with reduced peak pulse current (38.6A vs. 77.1A) and power dissipation (1500W vs. 3000W). This part is suitable only for applications with lower transient current requirements.

3.0SMC24A from Littelfuse operates at 24V standoff but with significantly different clamping voltage (51V vs. 38.9V) and peak pulse current specification (520A at 8/20µs pulse). This part is not recommended as a direct substitute due to different transient response characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use 1SMC24A TR13 PBFREE as a direct replacement for 3KASMC24AHE3_A/I?

A: No. While 1SMC24A TR13 PBFREE maintains the 24V standoff voltage, it provides only 38.6A peak pulse current and 1500W power dissipation compared to the original 77.1A and 3000W. Use this part only if your application requires lower transient current protection.

Q: What is the difference between 3KASMC24AHE3_A/I and 3KASMC24AHE3_B/I?

A: Both parts are electrically identical with matching voltage, current, and power specifications. The primary difference is product status: 3KASMC24AHE3_A/I is obsolete while 3KASMC24AHE3_B/I is active. The _B/I variant is supplied in Tape & Reel packaging format. For new designs, 3KASMC24AHE3_B/I is the recommended choice.

Q: Does 3.0SMC24A work as a substitute?

A: No. Although 3.0SMC24A maintains 24V standoff voltage, it specifies 51V clamping voltage and 520A peak pulse current at 8/20µs pulse width, which differs significantly from the original 38.9V clamping and 77.1A at 10/1000µs. This part exhibits different transient suppression characteristics and is not a direct equivalent.

Q: Which substitute parts maintain automotive AEC-Q101 qualification?

A: Three substitutes carry automotive AEC-Q101 qualification: 3KASMC24AHE3_B/I (Vishay), TPSMD24A (Littelfuse), and SM30T28AY (STMicroelectronics). These are recommended for automotive applications requiring formal qualification compliance.

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 part's environmental specifications.

Q: What is the temperature range limitation I should consider?

A: The original 3KASMC24AHE3_A/I operates from -65°C to 185°C. Most active substitutes operate within -65°C to 150°C or -55°C to 175°C. Verify your application's temperature requirements before selection. TPSMD24A and SMDJ24A-HR/-HRA maintain the -65°C lower limit.

Q: Can I mix different substitute parts in the same design?

A: All qualified substitutes are pin-compatible in the DO-214AB SMC package and electrically equivalent within specified tolerances. However, maintain consistency within a single design to simplify procurement, testing, and field service documentation.

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