3KASMC33AHE3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC33AHE3_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 operates with a 33V reverse standoff voltage and provides 3000W peak pulse power protection. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued circuit protection and design continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	33V
Voltage - Breakdown (Min)	36.7V
Voltage - Clamping (Max) @ Ipp	53.3V
Current - Peak Pulse (10/1000µs)	56.3A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 185°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 3KASMC33AHE3_A/I is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 33V (exact match required)
Voltage - Breakdown (Min): 36.7V (exact match required)
Voltage - Clamping (Max) @ Ipp: 53.3V (exact match required)
Current - Peak Pulse (10/1000µs): 56.3A (exact match required)
Power - Peak Pulse: 3000W (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)

Parts are categorized into two groups: Direct Equivalents maintain all electrical and thermal specifications, while Manufacturer-Recommended Alternatives offer enhanced performance characteristics (higher power ratings or peak pulse currents) suitable for applications requiring additional margin or higher transient energy absorption.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temp Range	Product Status
3KASMC33AHE3_A/I	Vishay	33V	53.3V	56.3A	3000W	DO-214AB (SMCJ)	-65°C ~ 185°C	Obsolete
3KASMC33AHE3_B/I	Vishay	33V	53.3V	56.3A	3000W	DO-214AB (SMC)	-65°C ~ 185°C	Active
SM30T39AY	STMicroelectronics	33V	53.3V	56.3A	3000W	DO-214AB (SMC)	-55°C ~ 175°C	Active
SMDJ33A	Alpha & Omega Semiconductor Inc.	33V	53.3V	56.3A	3000W	DO-214AB (SMC)	-55°C ~ 150°C	Active
SMDJ33A-HR	Littelfuse Inc.	33V	53.3V	56.3A	3000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMDJ33A-HRA	Littelfuse Inc.	33V	53.3V	56.3A	3000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
TPSMD33A	Littelfuse Inc.	33V	53.3V	56.3A	3000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
3.0SMC33A	Littelfuse Inc.	33V	70V	365A (8/20µs)	—	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
5.0SMDJ33A	Taiwan Semiconductor Corporation	33V	53.3V	93.9A	5000W	DO-214AB (SMC)	-55°C ~ 175°C	Active
5.0SMDJ33A-T7	Littelfuse Inc.	33V	53.3V	93.9A	5000W	DO-214AB (SMCJ)	-65°C ~ 150°C	Active
SMCJ33A	MDD	33V	53.3V	28.2A	1500W	DO-214AB (SMC)	-50°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical & Thermal Performance):

The following parts provide complete functional equivalence to the 3KASMC33AHE3_A/I and are recommended as primary replacements:

3KASMC33AHE3_B/I (Vishay): Active status, identical specifications, same manufacturer lineage. Preferred for designs requiring continuity with original Vishay PAR® series qualification.
SM30T39AY (STMicroelectronics): Active status, TRANSIL™ series, AEC-Q101 automotive qualification. Suitable for automotive-grade applications with slightly reduced upper operating temperature (-55°C minimum vs. -65°C).
SMDJ33A-HR and SMDJ33A-HRA (Littelfuse): Active status, Tape & Reel packaging, AEC-Q101 qualified. Recommended for high-reliability applications requiring automotive-grade components.
TPSMD33A (Littelfuse): Active status, TPSMD series, AEC-Q101 automotive qualification. Highest inventory availability (26,400 pcs) among direct equivalents.

Enhanced Performance Alternatives (Higher Power or Current Ratings):

These parts maintain the 33V standoff voltage and 53.3V clamping voltage but provide increased transient energy absorption:

5.0SMDJ33A and 5.0SMDJ33A-T7 (Taiwan Semiconductor Corporation / Littelfuse): 5000W peak pulse power (vs. 3000W), 93.9A peak pulse current (vs. 56.3A). Suitable for applications requiring additional transient margin or higher energy events.

Not Recommended for Direct Substitution:

3.0SMC33A (Littelfuse): Exhibits different clamping voltage (70V vs. 53.3V) and peak pulse current (365A at 8/20µs vs. 56.3A at 10/1000µs). Electrical characteristics deviate from original specification.
SMCJ33A (MDD): Reduced peak pulse current (28.2A vs. 56.3A) and power rating (1500W vs. 3000W). Insufficient for applications designed around 3000W protection.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ33A as a direct replacement for 3KASMC33AHE3_A/I?

A: No. While SMCJ33A shares the same 33V standoff voltage and DO-214AB package, it provides only 1500W peak pulse power and 28.2A peak pulse current compared to the original 3000W and 56.3A specifications. This represents a 50% reduction in transient energy absorption capacity and is unsuitable for equivalent protection.

Q: What is the difference between 3KASMC33AHE3_A/I and 3KASMC33AHE3_B/I?

A: Both parts are electrically and thermally identical. The primary difference is packaging: the _A/I variant uses bulk packaging while the _B/I variant uses Tape & Reel (TR) format. The _B/I is the active production equivalent and is recommended for new designs.

Q: Can I use 5.0SMDJ33A-T7 instead of the original part?

A: Yes, with design consideration. The 5.0SMDJ33A-T7 maintains identical voltage specifications (33V standoff, 53.3V clamping) and package format (DO-214AB SMCJ) but provides enhanced performance: 5000W peak pulse power and 93.9A peak pulse current versus 3000W and 56.3A. This represents a performance upgrade suitable for applications requiring additional transient margin. Operating temperature range is -65°C to 150°C (vs. -65°C to 185°C for the original).

Q: Are all substitute parts AEC-Q101 qualified?

A: No. AEC-Q101 automotive qualification is confirmed for 3KASMC33AHE3_B/I, SM30T39AY, SMDJ33A-HR, SMDJ33A-HRA, TPSMD33A, and 5.0SMDJ33A-T7. SMDJ33A and SMCJ33A do not list AEC-Q101 qualification. For automotive applications, select from the AEC-Q101 qualified alternatives.

Q: What is the difference between DO-214AB (SMCJ) and DO-214AB (SMC) packaging?

A: Both designations refer to the same physical DO-214AB package footprint suitable for surface mount assembly. The SMCJ and SMC suffixes indicate supplier device package nomenclature but do not affect electrical performance or PCB compatibility. Parts are mechanically and electrically interchangeable at the board level.

Q: Why is 3.0SMC33A listed as a manufacturer-recommended alternative if it has different electrical characteristics?

A: The 3.0SMC33A is included as a manufacturer-recommended option for applications where higher clamping voltage (70V) and significantly higher peak pulse current (365A at 8/20µs) are beneficial. This part is suitable only for designs that can accommodate these enhanced specifications and is not a direct equivalent for circuits designed around 53.3V clamping and 56.3A peak pulse current.

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