Equivalent & Substitute Parts for P6SMB33A-M3/5B

Part Overview

The P6SMB33A-M3/5B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 28.2V reverse standoff voltage class and provides 45.7V maximum clamping voltage with 13.1A peak pulse current capability. The device is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this TVS diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28.2	V
Voltage - Breakdown (Min)	31.4	V
Voltage - Clamping (Max) @ Ipp	45.7	V
Current - Peak Pulse (10/1000µs)	13.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB33A-M3/5B is determined by the following critical parameters:

Voltage Class: Reverse standoff voltage of 28.2V ± tolerance and breakdown voltage minimum of 31.4V
Clamping Performance: Maximum clamping voltage at Ipp must not exceed 45.7V to maintain circuit protection integrity
Current Handling: Peak pulse current capability of 13.1A minimum (10/1000µs pulse definition)
Power Dissipation: 600W peak pulse power rating
Package Compatibility: DO-214AA / SMB surface mount package
Temperature Range: Operating junction temperature range of -65°C to 150°C minimum
Compliance: RoHS3 compliance and MSL 1 rating required

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Packaging Equivalents: Parts maintaining identical voltage class, clamping voltage, current rating, and power dissipation within the specified tolerances. These parts are interchangeable with no circuit redesign required.

Category B - Enhanced Performance Alternatives: Parts with superior current handling or power dissipation capabilities while maintaining the same voltage class and clamping characteristics. These parts provide additional design margin and are suitable for applications requiring higher transient current capacity.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR Min (V)	VC Max @ Ipp (V)	Ipp (A)	Power (W)	Temp Range (°C)	Package	RoHS
P6SMB33A-M3/5B	Vishay	28.2	31.4	45.7	13.1	600	-65 to 150	DO-214AA	ROHS3
P6SMB33A-E3/52	Vishay	28.2	31.4	45.7	13.1	600	-65 to 150	DO-214AA	ROHS3
1KSMB33A	Taiwan Semiconductor	28.2	31.4	45.7	21.9	1000	-55 to 175	DO-214AA	ROHS3
P6SMB33A	Eaton	28.2	31.4	45.7	13.3	600	-55 to 150	DO-214AA	RoHS
SM6T33A	STMicroelectronics	28.2	31.4	59	68 (8/20µs)	600	-55 to 150	DO-214AA	ROHS3
SM6T33AY	STMicroelectronics	28.2	31.4	59	68 (8/20µs)	600	-55 to 150	DO-214AA	ROHS3
SMBJ33A	Good-Ark Semiconductor	33	36.7	53.3	11.3	600	-55 to 150	DO-214AA	ROHS3
SMBJP6KE33A-TP	Micro Commercial Co	28.2	31.4	45.7	13.3	600	-55 to 175	DO-214AA	ROHS3
SZP6SMB33AT3G	Littelfuse	28.2	31.4	45.7	13.2	600	-65 to 150	DO-214AA	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Category A)

P6SMB33A-E3/52, SZP6SMB33AT3G, SMBJP6KE33A-TP, and P6SMB33A (Eaton) maintain electrical equivalence with the P6SMB33A-M3/5B. These parts share identical voltage class (28.2V standoff), clamping voltage (45.7V), and power rating (600W). All are RoHS3 compliant with MSL 1 rating. The primary difference is packaging format (Tape & Reel versus Tape & Box). These parts are suitable for direct replacement without circuit modification.

Enhanced Performance Alternative (Category B)

1KSMB33A provides superior current handling (21.9A versus 13.1A) and increased power dissipation (1000W versus 600W) while maintaining the same voltage class and clamping voltage. This part is suitable for applications requiring additional transient current capacity. Operating temperature range extends to 175°C. RoHS3 compliant.

Limited Compatibility Options

SM6T33A and SM6T33AY exhibit higher clamping voltage (59V versus 45.7V) and significantly higher peak pulse current (68A at 8/20µs pulse definition). These parts are not direct substitutes due to different pulse definition and elevated clamping voltage, which may alter circuit protection characteristics.

SMBJ33A operates at a different voltage class (33V standoff versus 28.2V) with modified breakdown and clamping voltages. This part is not suitable for direct substitution.

Compliance Considerations

All recommended substitutes maintain RoHS3 compliance and MSL 1 rating. SZP6SMB33AT3G includes AEC-Q101 automotive qualification. SM6T33AY includes AEC-Q101 automotive qualification. Selection should account for application-specific compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can P6SMB33A-E3/52 replace P6SMB33A-M3/5B in production?

A: Yes. Both parts are manufactured by Vishay with identical electrical specifications (28.2V standoff, 31.4V breakdown minimum, 45.7V clamping maximum, 13.1A peak pulse current, 600W power). The difference is packaging format: P6SMB33A-M3/5B uses Tape & Box while P6SMB33A-E3/52 uses Tape & Reel. Electrical performance and circuit compatibility are equivalent.

Q: Is 1KSMB33A a suitable substitute?

A: 1KSMB33A is electrically compatible for the voltage class (28.2V standoff, 45.7V clamping) but provides enhanced current handling (21.9A versus 13.1A) and power dissipation (1000W versus 600W). This part is suitable for applications where additional transient current capacity is beneficial. No circuit redesign is required; the part provides additional design margin.

Q: Why is SM6T33A not recommended as a direct substitute?

A: SM6T33A operates at a different clamping voltage (59V versus 45.7V) and uses a different pulse definition (8/20µs versus 10/1000µs). The elevated clamping voltage may alter circuit protection characteristics and is not equivalent to the original specification.

Q: What is the difference between ROHS3 and RoHS compliance?

A: ROHS3 represents the current RoHS 3 directive compliance standard. RoHS (without the "3" designation) indicates compliance with earlier RoHS standards. Both are acceptable for most applications; ROHS3 represents the most current regulatory compliance.

Q: Can SMBJ33A replace P6SMB33A-M3/5B?

A: No. SMBJ33A operates at a different voltage class (33V standoff versus 28.2V) with different breakdown (36.7V minimum versus 31.4V) and clamping voltages (53.3V versus 45.7V). This part is not electrically equivalent and is not suitable for direct substitution.

Q: Are all substitute parts available in the same DO-214AA package?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical compatibility with the original design. Packaging format differences (Tape & Reel, Tape & Box, Cut Tape) do not affect circuit compatibility.

Q: What is MSL 1 rating?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life with no moisture bake requirement prior to soldering. All listed parts maintain MSL 1 rating, ensuring consistent handling and storage requirements.

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