5KASMC33AHM3/9A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KASMC33AHM3/9A is a unidirectional Zener-type transient voltage suppressor manufactured by Vishay General Semiconductor - Diodes Division. This surface mount DO-214AB (SMC) package TVS diode is designed for transient overvoltage protection in 33V nominal applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33	V
Voltage - Breakdown (Min)	36.7	V
Voltage - Clamping (Max) @ Ipp	53.3	V
Power - Peak Pulse	5000	W (5kW)
Type	Zener	-
Unidirectional Channels	1	-
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature Range	-65°C ~ 185°C (TJ)	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the 5KASMC33AHM3/9A is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 33V
Voltage - Breakdown (Min): 36.7V
Voltage - Clamping (Max) @ Ipp: 53.3V
Package / Case: DO-214AB, SMC (surface mount)
Unidirectional Channels: 1
Type: Zener

Secondary Compatibility Factors:

Power - Peak Pulse rating (5000W nominal)
Current - Peak Pulse capability
Operating temperature range
RoHS3 compliance
Moisture Sensitivity Level (MSL): 1

Substitute parts are grouped into two categories based on peak pulse power rating:

Category A - Full Power Rating (5000W): Parts maintaining the original 5000W peak pulse specification, including 5KASMC33AHM3_A/I (Vishay), 5.0SMDJ33A (Taiwan Semiconductor Corporation), and 5.0SMDJ33A-T7 (Littelfuse Inc.).

Category B - Reduced Power Rating (1500W): Parts with lower peak pulse power (1500W), including SMCJ33A (MDD), SMCJ33A-HR (Littelfuse Inc.), SMCJ33A-HRA (Littelfuse Inc.), and SMCJ33A-HRAT7 (Littelfuse Inc.). These maintain voltage specifications but with reduced current-handling capability.

Category C - Modified Clamping Voltage: SMCJ33A-TR (STMicroelectronics) maintains the 33V standoff voltage but exhibits higher clamping voltage (69.7V) and different current pulse characteristics (143A at 8/20µs vs. standard 10/1000µs).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	Product Status
5KASMC33AHM3/9A	Vishay	33	36.7	53.3	-	5000	DO-214AB (SMC)	-65 ~ 185	Obsolete
5KASMC33AHM3_A/I	Vishay	33	36.7	53.3	93.8	5000	DO-214AB (SMC)	-65 ~ 185	Active
5.0SMDJ33A	Taiwan Semiconductor Corporation	33	36.7	53.3	93.9	5000	DO-214AB (SMC)	-55 ~ 175	Active
5.0SMDJ33A-T7	Littelfuse Inc.	33	36.7	53.3	93.9	5000	DO-214AB (SMCJ)	-65 ~ 150	Active
SMCJ33A	MDD	33	36.7	53.3	28.2	1500	DO-214AB (SMC)	-50 ~ 150	Active
SMCJ33A-HR	Littelfuse Inc.	33	36.7	53.3	28.2	1500	DO-214AB (SMCJ)	-65 ~ 150	Active
SMCJ33A-HRA	Littelfuse Inc.	33	36.7	53.3	28.2	1500	DO-214AB (SMCJ)	-65 ~ 150	Active
SMCJ33A-HRAT7	Littelfuse Inc.	33	36.7	53.3	28.2	1500	DO-214AB (SMCJ)	-65 ~ 150	Active
SMCJ33A-TR	STMicroelectronics	33	36.7	69.7	143 (8/20µs)	1500	DO-214AB (SMC)	-55 ~ 150	Active

Engineering Selection Recommendations

For Direct Replacement (Full Electrical Equivalence):

The 5KASMC33AHM3_A/I from Vishay is the primary direct substitute, maintaining identical voltage specifications (33V standoff, 36.7V breakdown, 53.3V clamping) and full 5000W peak pulse power rating. This part is active and carries the same automotive grade qualification (AEC-Q101) and operating temperature range (-65°C ~ 185°C) as the original, ensuring seamless integration into existing designs.

For Active Sourcing with Full Power Rating:

The 5.0SMDJ33A (Taiwan Semiconductor Corporation) and 5.0SMDJ33A-T7 (Littelfuse Inc.) both maintain the 5000W power specification and identical voltage parameters. The 5.0SMDJ33A-T7 offers extended low-temperature operation (-65°C) compared to the Taiwan Semiconductor part (-55°C), making it suitable for automotive and industrial applications requiring full temperature range coverage.

For Cost-Optimized Substitution (Reduced Power Rating):

The SMCJ33A series from MDD, Littelfuse (SMCJ33A-HR, SMCJ33A-HRA, SMCJ33A-HRAT7) provides active alternatives with identical voltage specifications but reduced peak pulse power (1500W). These parts are suitable for applications where transient energy levels do not exceed 1500W. The Littelfuse variants offer extended temperature range (-65°C) compared to the MDD part (-50°C).

For Modified Clamping Voltage Applications:

The SMCJ33A-TR (STMicroelectronics) maintains the 33V standoff voltage but exhibits higher clamping voltage (69.7V) and operates on an 8/20µs pulse standard rather than 10/1000µs. This part is suitable only for applications where higher clamping voltage is acceptable and pulse characteristics align with 8/20µs transient profiles.

Compliance and Certification:

All substitute parts maintain RoHS3 compliance and MSL Level 1 (unlimited moisture sensitivity). Selection should prioritize parts with active product status and matching automotive qualification (AEC-Q101) for safety-critical applications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ33A series parts (1500W) directly replace the 5KASMC33AHM3/9A (5000W)?

A: Electrical substitution is valid only if the application's transient energy does not exceed 1500W. The voltage specifications (33V standoff, 53.3V clamping) are identical. However, if the original design relies on 5000W dissipation capability, the reduced power rating will result in inadequate protection. Verify transient energy levels in your circuit before substitution.

Q: What is the difference between 5.0SMDJ33A and SMCJ33A-TR?

A: Both are 33V standoff TVS diodes in DO-214AB packages. The 5.0SMDJ33A maintains 53.3V clamping voltage and 5000W power rating. The SMCJ33A-TR has higher clamping voltage (69.7V) and operates on 8/20µs pulse characteristics instead of 10/1000µs. The SMCJ33A-TR is not a direct electrical equivalent and should only be used if higher clamping voltage is acceptable for your application.

Q: Are Littelfuse SMCJ33A-HR, SMCJ33A-HRA, and SMCJ33A-HRAT7 interchangeable?

A: Yes. All three Littelfuse variants maintain identical electrical specifications (33V standoff, 53.3V clamping, 1500W power, 28.2A peak pulse). The suffix designations (-HR, -HRA, -HRAT7) indicate packaging or tape configuration variants. They are electrically interchangeable within the same application constraints.

Q: Why is the original 5KASMC33AHM3/9A marked as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. Active equivalents from Vishay (5KASMC33AHM3_A/I) and other manufacturers provide continued sourcing options. For new designs, select from the active substitute parts listed to ensure long-term component availability.

Q: Can I use SMCJ33A-TR as a direct replacement?

A: No. While SMCJ33A-TR maintains the 33V standoff voltage, it exhibits significantly different electrical characteristics: 69.7V clamping voltage (vs. 53.3V) and 8/20µs pulse rating (vs. 10/1000µs standard). Use only if your circuit design specifically accommodates higher clamping voltage and 8/20µs transient profiles.

Q: What is the temperature range difference between substitutes?

A: The original part operates -65°C ~ 185°C. Most active substitutes operate -65°C ~ 150°C or -55°C ~ 150°C. For applications requiring the full -65°C ~ 185°C range, the 5KASMC33AHM3_A/I (Vishay) is the only listed substitute maintaining this specification. Verify your application's temperature requirements before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance and MSL Level 1 (unlimited moisture sensitivity), matching the original part's environmental specifications.

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