SMAJ33A-TP Equivalent & Substitute Parts

Part Overview

The SMAJ33A-TP is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 33V reverse standoff voltage with a 53.3V maximum clamping voltage at peak pulse current, housed in a DO-214AC (SMA) package. This part is active and in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when electrical parameters and package specifications align with the original design requirements, ensuring functional equivalence in circuit protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33	V
Voltage - Breakdown (Min)	36.7	V
Voltage - Clamping (Max) @ Ipp	53.3	V
Current - Peak Pulse (10/1000µs)	7.5	A
Power - Peak Pulse	400	W
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55°C ~ 175°C	TA
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ33A-TP are classified into two categories based on electrical parameter alignment:

Direct Electrical Equivalents maintain identical specifications across all critical parameters: 33V reverse standoff voltage, 36.7V minimum breakdown voltage, 53.3V maximum clamping voltage, 7.5A peak pulse current, and 400W peak pulse power. These parts are functionally interchangeable in the same circuit application. All direct equivalents use the DO-214AC (SMA) surface-mount package and maintain RoHS3 compliance with MSL 1 rating.

Similar Parts share the same 33V reverse standoff and 36.7V breakdown voltages but differ in clamping voltage and/or peak pulse current specifications. These parts are suitable only when the application circuit can tolerate higher clamping voltages or peak current ratings. Selection of similar parts requires circuit-level validation to confirm compatibility with the intended protection scheme.

The substitution logic is based strictly on the following parameters:

Voltage - Reverse Standoff (Typ): 33V
Voltage - Breakdown (Min): 36.7V
Voltage - Clamping (Max) @ Ipp: 53.3V (direct equivalents only)
Current - Peak Pulse (10/1000µs): 7.5A (direct equivalents only)
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

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	Package	RoHS Status
SMAJ33A-TP	Micro Commercial Co	33V	36.7V	53.3V	7.5A	400W	-55°C ~ 175°C (TA)	DO-214AC, SMA	ROHS3
ATV04A330J-HF	Comchip Technology	33V	36.7V	53.3V	7.5A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3
SMAJ33A	MDD	33V	36.7V	53.3V	7.5A	400W	-50°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3
SMAJ33A-13-F	Diodes Incorporated	33V	36.7V	53.3V	7.5A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3
SMAJ33A-E3/61	Vishay General Semiconductor - Diodes Division	33V	36.7V	53.3V	7.5A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3
SZ1SMA33AT3G	Littelfuse Inc.	33V	36.7V	53.3V	7.5A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3
TV04A330J-G	Comchip Technology	33V	36.7V	53.3V	7.5A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3
SM4T39AY	STMicroelectronics	33V	36.7V	69.7V	33A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3
SMA6J33A-TR	STMicroelectronics	33V	36.7V	60.8V	57A (8/20µs)	600W	-55°C ~ 175°C (TJ)	DO-214AC, SMA	ROHS3
SMAJ33A-TR	STMicroelectronics	33V	36.7V	69.7V	33A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalents (ATV04A330J-HF, SMAJ33A, SMAJ33A-13-F, SMAJ33A-E3/61, SZ1SMA33AT3G, TV04A330J-G) are recommended for direct replacement of the SMAJ33A-TP in existing designs. All maintain identical electrical performance with 53.3V clamping voltage and 7.5A peak pulse current. Selection among these equivalents should consider:

Operating temperature range requirements: The SMAJ33A-TP operates to 175°C (TA), while most direct equivalents are rated to 150°C (TJ). The SMA6J33A-TR also supports 175°C operation.
Automotive qualification: ATV04A330J-HF and SZ1SMA33AT3G carry AEC-Q101 automotive qualification if required by application standards.
Packaging format: All direct equivalents use DO-214AC (SMA) surface mount, ensuring PCB compatibility.
Compliance certifications: All direct equivalents maintain ROHS3 compliance and MSL 1 rating.

Similar Parts (SM4T39AY, SMA6J33A-TR, SMAJ33A-TR) feature higher clamping voltages (60.8V to 69.7V) and significantly higher peak pulse currents (33A to 57A). These parts are suitable only when the application circuit design permits higher transient voltage clamping levels and can benefit from increased current handling capacity. Circuit validation is required before substitution.

Frequently Asked Questions (FAQ)

Q: Can I use ATV04A330J-HF as a direct replacement for SMAJ33A-TP?

A: Yes. ATV04A330J-HF is a direct electrical equivalent with identical 33V standoff voltage, 36.7V breakdown voltage, 53.3V clamping voltage, and 7.5A peak pulse current. The primary difference is the maximum operating temperature of 150°C (TJ) versus 175°C (TA) for the original part. If your application operates within -55°C to 150°C, this part is fully compatible. ATV04A330J-HF also includes AEC-Q101 automotive qualification.

Q: What is the difference between direct equivalents and similar parts?

A: Direct equivalents maintain identical electrical specifications: 53.3V clamping voltage and 7.5A peak pulse current. Similar parts (SM4T39AY, SMA6J33A-TR, SMAJ33A-TR) have higher clamping voltages (60.8V to 69.7V) and peak currents (33A to 57A). Similar parts are not interchangeable without circuit-level analysis to confirm the application can tolerate higher transient voltages.

Q: Are all substitute parts in the same package as SMAJ33A-TP?

A: Yes. All listed substitute and similar parts use the DO-214AC (SMA) surface-mount package, ensuring PCB footprint compatibility with the original design.

Q: Does SMAJ33A-TP have automotive qualification?

A: The SMAJ33A-TP itself does not carry AEC-Q101 qualification. However, direct equivalents ATV04A330J-HF and SZ1SMA33AT3G are AEC-Q101 qualified if automotive-grade components are required.

Q: What is the difference between SMAJ33A-TP and SMAJ33A-TR?

A: SMAJ33A-TP and SMAJ33A-TR are both manufactured by STMicroelectronics but differ in electrical specifications. SMAJ33A-TP has 53.3V clamping voltage and 7.5A peak pulse current, while SMAJ33A-TR has 69.7V clamping voltage and 33A peak pulse current. SMAJ33A-TR is a similar part, not a direct equivalent, and requires circuit validation before use.

Q: Can I substitute SZ1SMA33AT3G for SMAJ33A-TP in a consumer application?

A: Yes. SZ1SMA33AT3G is a direct electrical equivalent with identical 33V standoff, 36.7V breakdown, 53.3V clamping, and 7.5A peak pulse specifications. Although SZ1SMA33AT3G carries AEC-Q101 automotive qualification, it is fully compatible with consumer applications. The extended operating temperature range (-65°C to 150°C) provides additional margin in low-temperature environments.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. Both the original SMAJ33A-TP and all substitute parts carry MSL 1 rating, eliminating moisture-related supply chain constraints.

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