3KASMC28AHE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC28AHE3_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 rated for 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 66.1A peak pulse current capability, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.

The 3KASMC28AHE3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers with identical or compatible electrical and mechanical specifications, ensuring design continuity and supply chain flexibility.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V
Current - Peak Pulse (10/1000µs)	66.1A
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 for the 3KASMC28AHE3_A/I is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 28V
Voltage - Breakdown (Min): 31.1V
Voltage - Clamping (Max) @ Ipp: 45.4V
Current - Peak Pulse (10/1000µs): 66.1A
Power - Peak Pulse: 3000W
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener

All substitute parts listed maintain these core electrical specifications and package compatibility. Operating temperature range, product status, and manufacturer certifications may vary within acceptable engineering tolerances but do not affect functional substitution.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temperature	Product Status	AEC-Q101
3KASMC28AHE3_A/I	Vishay	28V	45.4V	66.1A	3000W	DO-214AB (SMCJ)	-65°C ~ 185°C	Obsolete	Yes
3KASMC28AHE3_B/I	Vishay	28V	45.4V	66.1A	3000W	DO-214AB (SMC)	-65°C ~ 185°C	Active	Yes
3.0SMCJ28A-13	Diodes Incorporated	28V	45.4V	66.1A	3000W	DO-214AB, SMC	-55°C ~ 175°C	Active	No
SM30T33AY	STMicroelectronics	28V	45.4V	66.1A	3000W	DO-214AB, SMC	-55°C ~ 175°C	Active	Yes
SMDJ28A	Alpha & Omega Semiconductor Inc.	28V	45.4V	66.1A	3000W	DO-214AB, SMC	-55°C ~ 150°C	Active	No
SMDJ28A-HR	Littelfuse Inc.	28V	45.4V	66.1A	3000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active	No
SMDJ28A-HRA	Littelfuse Inc.	28V	45.4V	66.1A	3000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active	No
SMDJ28A-HRAT7	Littelfuse Inc.	28V	45.4V	66.1A	3000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active	No
TPSMD28A	Littelfuse Inc.	28V	45.4V	66.1A	3000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active	Yes

Engineering Selection Recommendations

Primary Recommendation: 3KASMC28AHE3_B/I

The 3KASMC28AHE3_B/I is the direct manufacturer equivalent from Vishay, maintaining identical electrical specifications and AEC-Q101 automotive qualification. This part is currently in active production status with substantial inventory availability (33,300 units), ensuring supply continuity. The operating temperature range (-65°C ~ 185°C) matches the original specification exactly.

Secondary Recommendations for Active Supply:

TPSMD28A (Littelfuse Inc.): Active status with AEC-Q101 qualification and automotive-grade designation. Operating temperature range extends to -65°C, matching the original part's lower limit. Inventory: 4,168 units.
SM30T33AY (STMicroelectronics): Active status with AEC-Q101 qualification and automotive-grade designation. Part of the TRANSIL™ series. Inventory: 3,400 units. Operating temperature range is -55°C ~ 175°C.
SMDJ28A (Alpha & Omega Semiconductor Inc.): Active status with highest inventory availability (41,900 units). Electrical specifications are fully equivalent. Operating temperature range is -55°C ~ 150°C, which may require thermal analysis for applications requiring the full -65°C lower limit.

Littelfuse SMDJ-HR Series (SMDJ28A-HR, SMDJ28A-HRA, SMDJ28A-HRAT7): All three variants maintain identical electrical specifications and are in active production. These parts offer extended lower temperature operation to -65°C. Inventory levels range from 879 to 1,052 units.

Diodes Incorporated 3.0SMCJ28A-13: Active status with full electrical equivalence. Operating temperature range is -55°C ~ 175°C. Inventory: 7,042 units.

Frequently Asked Questions (FAQ)

Q: Can I substitute the obsolete 3KASMC28AHE3_A/I with any of the listed parts?

A: Yes. All listed substitute parts maintain identical electrical specifications: 28V reverse standoff voltage, 45.4V maximum clamping voltage, 66.1A peak pulse current, and 3000W peak pulse power. All are packaged in DO-214AB (SMC) surface mount configuration. The primary consideration is operating temperature range for your specific application.

Q: What is the difference between 3KASMC28AHE3_A/I and 3KASMC28AHE3_B/I?

A: Both parts are from Vishay with identical electrical and thermal specifications. The primary difference is product status: 3KASMC28AHE3_A/I is obsolete, while 3KASMC28AHE3_B/I is active production. The supplier device package designation differs slightly (SMCJ vs. SMC), but both are DO-214AB packages suitable for the same PCB footprint.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect electrical substitution if your application operates within the substitute part's specified range. The original 3KASMC28AHE3_A/I operates from -65°C ~ 185°C. Substitute parts with narrower ranges (such as -55°C ~ 175°C) are electrically equivalent but may require thermal analysis if your design requires operation at the original part's temperature extremes.

Q: Are all substitute parts AEC-Q101 qualified?

A: No. AEC-Q101 qualification is present on 3KASMC28AHE3_B/I (Vishay), SM30T33AY (STMicroelectronics), and TPSMD28A (Littelfuse). If automotive qualification is a design requirement, these three parts are recommended. Other substitutes are functionally equivalent but lack this specific certification.

Q: What is the difference between Littelfuse SMDJ28A-HR, SMDJ28A-HRA, and SMDJ28A-HRAT7?

A: All three Littelfuse variants maintain identical electrical specifications and operating temperature range (-65°C ~ 150°C). The designations reflect different packaging or tape configurations. Selection between these variants depends on your procurement and assembly requirements.

Q: Can I use 3.0SMC28A as a substitute?

A: No. The 3.0SMC28A has different electrical specifications: 59V maximum clamping voltage and 470A peak pulse current (8/20µs), compared to the required 45.4V clamping and 66.1A (10/1000µs). This part is not electrically equivalent and cannot be substituted.

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