5KASMC33AHM3/57 TVS Diode Equivalent & Substitute Parts

Part Overview

The 5KASMC33AHM3/57 is a 33V unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component in DO-214AB (SMC) package is designed for transient overvoltage protection in automotive and general-purpose applications. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements. Suitable alternatives maintain the same voltage ratings, clamping characteristics, and package form factor while offering active product status and improved availability.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	33V
Voltage - Breakdown (Min)	36.7V
Voltage - Clamping (Max) @ Ipp	53.3V
Power - Peak Pulse	5000W (5kW)
Type	Zener
Unidirectional Channels	1
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Operating Temperature Range	-65°C ~ 185°C (TJ)
RoHS Status	ROHS3 Compliant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution eligibility for the 5KASMC33AHM3/57 is determined by the following critical parameters:

Mandatory Matching Parameters:

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

Acceptable Variation Parameters:

Power - Peak Pulse: 5000W minimum (higher ratings acceptable)
Current - Peak Pulse (10/1000µs): Variable based on manufacturer design
Operating Temperature Range: Minimum -65°C to +150°C acceptable
Product Status: Active preferred (obsolete parts not suitable for new designs)
RoHS Compliance: ROHS3 required

Substitute parts are grouped into two categories: direct Vishay alternatives and cross-manufacturer equivalents from Taiwan Semiconductor Corporation, Littelfuse Inc., and MDD. All listed substitutes maintain identical voltage specifications and package compatibility while offering active product status and current manufacturing availability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Power - Peak Pulse	Current - Peak Pulse	Operating Temp Range	Product Status	Package
5KASMC33AHM3/57	Vishay	33V	36.7V	53.3V	5000W	—	-65°C ~ 185°C	Obsolete	DO-214AB (SMC)
5KASMC33AHM3_A/H	Vishay	33V	36.7V	53.3V	5000W	—	-65°C ~ 185°C	Active	DO-214AB (SMC)
5.0SMDJ33A	Taiwan Semiconductor Corporation	33V	36.7V	53.3V	5000W	93.9A	-55°C ~ 175°C	Active	DO-214AB (SMC)
5.0SMDJ33A-T7	Littelfuse Inc.	33V	36.7V	53.3V	5000W	93.9A	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ33A	MDD	33V	36.7V	53.3V	1500W	28.2A	-50°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ33A-HR	Littelfuse Inc.	33V	36.7V	53.3V	1500W	28.2A	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ33A-HRA	Littelfuse Inc.	33V	36.7V	53.3V	1500W	28.2A	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ33A-HRAT7	Littelfuse Inc.	33V	36.7V	53.3V	1500W	28.2A	-65°C ~ 150°C	Active	DO-214AB (SMC)
SMCJ33A-TR	STMicroelectronics	33V	36.7V	69.7V	1500W	143A (8/20µs)	-55°C ~ 150°C	Active	DO-214AB (SMC)

Engineering Selection Recommendations

Tier 1 - Direct Manufacturer Replacement: 5KASMC33AHM3_A/H (Vishay) is the primary substitute. This part maintains identical electrical specifications, operating temperature range (-65°C ~ 185°C), and 5000W power rating as the original 5KASMC33AHM3/57. Active product status and Tape & Reel packaging ensure production continuity. Automotive grade and AEC-Q101 qualification are retained.

Tier 2 - High Power Cross-Manufacturer Alternatives: 5.0SMDJ33A (Taiwan Semiconductor Corporation) and 5.0SMDJ33A-T7 (Littelfuse Inc.) maintain the 5000W power specification with identical voltage ratings. Both are active products with ROHS3 compliance. The Taiwan Semiconductor part operates -55°C ~ 175°C; the Littelfuse variant extends to -65°C minimum. Peak pulse current specifications (93.9A) are provided for both.

Tier 3 - Standard Power Alternatives: SMCJ33A (MDD), SMCJ33A-HR, SMCJ33A-HRA, and SMCJ33A-HRAT7 (Littelfuse Inc.) are active alternatives with reduced power rating (1500W) and lower peak pulse current (28.2A). These are suitable for applications where the full 5000W capability is not required. Littelfuse variants maintain -65°C minimum operating temperature; MDD variant operates -50°C ~ 150°C.

Tier 4 - Alternative Clamping Voltage: SMCJ33A-TR (STMicroelectronics) maintains voltage standoff and breakdown specifications but features elevated clamping voltage (69.7V) and higher peak pulse current (143A at 8/20µs). This part is suitable only where the higher clamping voltage is acceptable for the application.

Selection should prioritize Tier 1 for direct replacement. Tier 2 options are suitable where 5000W power handling is required. Tier 3 alternatives are appropriate for standard protection applications. Tier 4 should be evaluated only when higher clamping voltage is compatible with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ33A (MDD) as a direct replacement for 5KASMC33AHM3/57? A: SMCJ33A is electrically compatible for voltage specifications (33V standoff, 36.7V breakdown, 53.3V clamping) and package (DO-214AB SMC). However, it has reduced power rating (1500W vs. 5000W) and lower peak pulse current (28.2A vs. unspecified). Use only if your circuit does not require the full 5000W transient energy dissipation capability.

Q: What is the difference between 5.0SMDJ33A and SMCJ33A? A: Both maintain identical voltage ratings and package form. The 5.0SMDJ33A series retains the 5000W power specification with 93.9A peak pulse current. SMCJ33A variants are rated 1500W with 28.2A peak pulse current. Select 5.0SMDJ33A for high-energy transient protection; select SMCJ33A for standard protection applications.

Q: Are Littelfuse SMCJ33A-HR, SMCJ33A-HRA, and SMCJ33A-HRAT7 interchangeable? A: Yes. All three Littelfuse variants share identical electrical specifications (33V standoff, 36.7V breakdown, 53.3V clamping, 1500W power, 28.2A peak pulse current) and operating temperature range (-65°C ~ 150°C). The suffix designations indicate packaging and tape configuration variants. Select based on your procurement and assembly requirements.

Q: Why does SMCJ33A-TR have a different clamping voltage (69.7V)? A: SMCJ33A-TR from STMicroelectronics is designed with different internal characteristics, resulting in 69.7V clamping voltage versus 53.3V for other alternatives. This part is suitable only when the higher clamping voltage is compatible with your circuit protection requirements.

Q: Is the original 5KASMC33AHM3/57 still available? A: The 5KASMC33AHM3/57 is obsolete. Inventory of 805 pieces exists but is limited. For new designs and ongoing production, use active alternatives such as 5KASMC33AHM3_A/H (Vishay) or cross-manufacturer equivalents.

Q: What is the minimum operating temperature requirement for automotive applications? A: The original part specifies -65°C ~ 185°C. Direct replacement 5KASMC33AHM3_A/H maintains this range. Most alternatives support -65°C minimum except SMCJ33A (MDD, -50°C minimum) and 5.0SMDJ33A (Taiwan Semiconductor, -55°C minimum). Verify your automotive specification requirements before selection.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant. The original 5KASMC33AHM3/57 is also ROHS3 compliant.

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