3KASMC28HE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC28HE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 28V reverse standoff voltage class and provides transient overvoltage protection in DO-214AB (SMC) packaging. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KASMC28HE3_A/I
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	50V
Current - Peak Pulse (10/1000µs)	60A
Power - Peak Pulse	3000W (3kW)
Operating Temperature Range	-65°C ~ 185°C (TJ)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Grade	Automotive
Qualification	AEC-Q101
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 3KASMC28HE3_A/I is determined by the following critical parameters:

Voltage Class: Reverse standoff voltage of 28V and breakdown voltage minimum of 31.1V
Clamping Voltage: Maximum clamping voltage at peak pulse current (Ipp)
Peak Pulse Current: Current handling capability at 10/1000µs pulse duration
Power Dissipation: Peak pulse power rating
Package Compatibility: DO-214AB (SMC) surface mount form factor
Operating Temperature Range: Minimum -55°C to -65°C lower bound; minimum 150°C upper bound
Compliance: RoHS3 compliance and automotive-grade qualification where applicable

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Direct Electrical Equivalents (50V Clamping, 60A Ipp): Parts matching the original 50V clamping voltage and 60A peak pulse current specification.

Category B - Functional Alternatives (45.4V Clamping, 66A+ Ipp): Parts with lower clamping voltage (45.4V) but higher peak pulse current capability, suitable for applications where lower clamping voltage is acceptable and higher current handling is beneficial.

Category C - High-Performance Alternatives (45V Clamping, 334A-500A Ipp): High-current rated parts with significantly elevated peak pulse current and power dissipation for demanding transient protection applications.

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 Range	Package / Case	Product Status	RoHS Status
3KASMC28HE3_A/I	Vishay General Semiconductor - Diodes Division	28V	31.1V	50V	60A	3000W	-65°C ~ 185°C	DO-214AB, SMC	Obsolete	ROHS3 Compliant
3KASMC28AHE3_B/I	Vishay General Semiconductor - Diodes Division	28V	31.1V	45.4V	66.1A	3000W	-65°C ~ 185°C	DO-214AB, SMC	Active	ROHS3 Compliant
SMLJ28E3/TR13	Microchip Technology	28V	31.1V	50V	60A	300W	-55°C ~ 150°C	DO-214AB, SMC	Active	ROHS3 Compliant
1SMC28A TR13 TIN/LEAD	Central Semiconductor Corp	28V	31.1V	45.4V	33A	1500W	-65°C ~ 150°C	DO-214AB, SMC	Active	RoHS non-compliant
3.0SMC28A	Littelfuse Inc.	28V	31.1V	59V	470A (8/20µs)	—	-65°C ~ 150°C	DO-214AB, SMC	Active	ROHS3 Compliant
3.0SMCJ28A-13	Diodes Incorporated	28V	31.1V	45.4V	66.1A	3000W	-55°C ~ 175°C	DO-214AB, SMC	Active	ROHS3 Compliant
3SMC28A TR13 PBFREE	Central Semiconductor Corp	28V	31.1V	45.4V	66A	3000W	-65°C ~ 150°C	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ28A	Taiwan Semiconductor Corporation	28V	31.1V	45.4V	110A	5000W	-55°C ~ 175°C	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ28A-T7	Littelfuse Inc.	28V	31.1V	45.4V	110A	5000W	-65°C ~ 150°C	DO-214AB, SMC	Active	ROHS3 Compliant
LNBTVS4-304S	STMicroelectronics	28V	30V	45V	334A (8/20µs)	22500W	-55°C ~ 150°C	DO-214AB, SMC	Active	ROHS3 Compliant
LNBTVS6-304S	STMicroelectronics	28V	30V	45V	500A (8/20µs)	22500W	-55°C ~ 150°C	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Electrical Match:

The SMLJ28E3/TR13 (Microchip Technology) provides the closest electrical equivalence to the 3KASMC28HE3_A/I, matching the 50V clamping voltage and 60A peak pulse current specification. This part is active in production and RoHS3 compliant. The operating temperature range (-55°C ~ 150°C) is narrower than the original part; applications requiring the full -65°C ~ 185°C range must account for this limitation.

Vishay Ecosystem Alternative:

The 3KASMC28AHE3_B/I is the active production equivalent within the Vishay PAR® series. This part maintains the same manufacturer lineage, identical voltage class, and full operating temperature range (-65°C ~ 185°C). The clamping voltage is reduced to 45.4V with increased peak pulse current (66.1A), making it suitable for applications where lower clamping voltage is acceptable.

High-Current Applications:

For applications requiring enhanced transient suppression capability, the 5.0SMDJ28A-T7 (Littelfuse) and 5.0SMDJ28A (Taiwan Semiconductor Corporation) offer 110A peak pulse current with 5000W power dissipation at 45.4V clamping voltage. Both parts are RoHS3 compliant and active in production.

Maximum Performance Alternative:

The LNBTVS6-304S (STMicroelectronics) provides the highest peak pulse current (500A at 8/20µs) and power dissipation (22500W) in the 28V class. This part is suitable for severe transient environments and is RoHS3 compliant.

Compliance Consideration:

The 1SMC28A TR13 TIN/LEAD (Central Semiconductor Corp) is not RoHS3 compliant and should be avoided in applications requiring RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower clamping voltage than the original 3KASMC28HE3_A/I?

A: Yes, provided the circuit design accommodates the lower clamping voltage. Parts with 45.4V clamping (such as 3KASMC28AHE3_B/I, 3.0SMCJ28A-13, 3SMC28A TR13 PBFREE, 5.0SMDJ28A, and 5.0SMDJ28A-T7) maintain the same 28V reverse standoff and 31.1V breakdown voltage specifications. Lower clamping voltage results in tighter voltage regulation during transient events.

Q: What is the difference between 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform is standard for TVS diode characterization per IEC 61000-4-2. The 8/20µs waveform is used for surge testing per IEC 61000-4-5. Parts specified with 8/20µs (LNBTVS4-304S and LNBTVS6-304S) are rated for higher peak currents under this longer pulse duration.

Q: Is the SMLJ28E3/TR13 a direct replacement for the 3KASMC28HE3_A/I?

A: The SMLJ28E3/TR13 matches the electrical specifications (50V clamping, 60A peak pulse current) and package form factor. However, its operating temperature range (-55°C ~ 150°C) is narrower than the original part (-65°C ~ 185°C). Verify that your application does not require operation below -55°C or above 150°C.

Q: Why does the 3KASMC28AHE3_B/I have a lower clamping voltage but higher peak pulse current?

A: Lower clamping voltage and higher peak pulse current are related to the internal device design and thermal characteristics. The 3KASMC28AHE3_B/I achieves tighter voltage regulation (45.4V vs. 50V) while handling increased current (66.1A vs. 60A) within the same 3000W power budget.

Q: Are all substitute parts RoHS3 compliant?

A: No. The 1SMC28A TR13 TIN/LEAD is RoHS non-compliant. All other listed substitutes are RoHS3 compliant. Verify RoHS compliance requirements for your application before selection.

Q: Can I use the high-current LNBTVS series parts as drop-in replacements?

A: The LNBTVS4-304S and LNBTVS6-304S are package-compatible (DO-214AB, SMC) and maintain the 28V voltage class. However, their significantly higher peak pulse current ratings (334A and 500A respectively) and power dissipation (22500W) indicate they are designed for more severe transient environments. Use these parts only if your circuit requires this enhanced protection capability.

Q: What is the significance of the "TR" designation in part numbers?

A: The "TR" designation indicates Tape & Reel packaging, which is standard for automated assembly. This is the standard production packaging format for surface mount TVS diodes.

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