P6SMB33CA-M3/5B Equivalent & Substitute Parts

Part Overview

The P6SMB33CA-M3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates in the DO-214AA (SMB) surface mount package and is designed for general-purpose transient voltage suppression applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when packaging variants, manufacturer alternatives, or enhanced performance specifications are required while maintaining electrical compatibility within the defined parameter range.

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	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the P6SMB33CA-M3/5B are classified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Breakdown (Min): 31.4V
Voltage - Clamping (Max) @ Ipp: 45.7V (±tolerance)
Current - Peak Pulse: 13.1A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Type: Zener, Bidirectional

Grouping Categories:

Direct Equivalent (Packaging Variant): P6SMB33CA-E3/52 differs only in packaging format (Tape & Reel vs. Tape & Box) while maintaining identical electrical specifications.

Cross-Manufacturer Equivalents (Electrical Match): SMBJP6KE33CA-TP, P6SMB33CAH, SZP6SMB33CAT3G, and TPSMB33CA maintain the core voltage and power specifications with minor variations in peak pulse current (13.2A to 13.8A) and temperature range extensions.

Performance Variant (Higher Clamping Voltage): SM6T33CA and SM6T33CAY exhibit higher clamping voltage (59V) and significantly higher peak pulse current (68A at 8/20µs), suitable for applications requiring enhanced transient suppression but with different electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) V	Vbr (Min) V	Vc (Max) V	Ipp A	Pkg	Temp Range °C	RoHS
P6SMB33CA-M3/5B	Vishay	28.2	31.4	45.7	13.1	DO-214AA SMB	-65 to 150	ROHS3
P6SMB33CA-E3/52	Vishay	28.2	31.4	45.7	13.1	DO-214AA SMB	-65 to 150	ROHS3
SMBJP6KE33CA-TP	Micro Commercial Co	28.2	31.4	45.7	13.3	DO-214AA SMB	-55 to 175	ROHS3
P6SMB33CA	Eaton	28.2	31.4	45.7	13.3	DO-214AA SMB	-55 to 150	RoHS
P6SMB33CAH	Taiwan Semiconductor	28.2	31.4	45.7	13.8	DO-214AA SMB	-55 to 150	ROHS3
SM6T33CA	STMicroelectronics	28.2	31.4	59	68 (8/20µs)	DO-214AA SMB	-55 to 150	ROHS3
SM6T33CAY	STMicroelectronics	28.2	31.4	59	68 (8/20µs)	DO-214AA SMB	-55 to 150	ROHS3
SZP6SMB33CAT3G	Littelfuse	28.2	31.4	45.7	13.2	DO-214AA SMB	-65 to 150	ROHS3
TPSMB33CA	Littelfuse	28.2	31.4	45.7	13.3	DO-214AA SMB	-65 to 175	ROHS3

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance): P6SMB33CA-E3/52 is a direct substitute differing only in packaging format (Tape & Reel). Selection depends on procurement and assembly requirements.

Cross-Manufacturer Equivalents (Maintained Specifications): SMBJP6KE33CA-TP, P6SMB33CA (Eaton), P6SMB33CAH, SZP6SMB33CAT3G, and TPSMB33CA maintain the 28.2V standoff voltage, 31.4V breakdown voltage, and 45.7V clamping voltage with peak pulse currents between 13.1A and 13.8A. These parts are suitable for direct substitution in applications where the original specification is met. SMBJP6KE33CA-TP and TPSMB33CA offer extended temperature ranges (-55°C to 175°C), beneficial for high-temperature environments. SZP6SMB33CAT3G and TPSMB33CA carry AEC-Q101 automotive qualification.

Performance Variant (Enhanced Transient Suppression): SM6T33CA and SM6T33CAY exhibit higher clamping voltage (59V) and significantly higher peak pulse current (68A at 8/20µs). These parts are not direct electrical equivalents and are suitable only when enhanced transient suppression capability is required and the higher clamping voltage is acceptable for the application. Both carry AEC-Q101 automotive qualification.

Compliance Considerations: All listed parts maintain ROHS3 compliance or equivalent RoHS compliance. Moisture sensitivity level is MSL 1 (Unlimited) across all variants. Selection should account for specific supply chain, temperature operating range, and automotive qualification requirements if applicable.

Frequently Asked Questions (FAQ)

Q: Can P6SMB33CA-E3/52 replace P6SMB33CA-M3/5B directly? A: Yes. Both parts are electrically identical with 28.2V standoff voltage, 31.4V breakdown voltage, and 45.7V clamping voltage. The difference is packaging format: P6SMB33CA-M3/5B uses Tape & Box while P6SMB33CA-E3/52 uses Tape & Reel. Selection depends on assembly and procurement requirements.

Q: What is the difference between the Vishay P6SMB33CA and the Littelfuse SZP6SMB33CAT3G? A: Both maintain identical voltage specifications (28.2V standoff, 31.4V breakdown, 45.7V clamping) and 600W peak pulse power. The Littelfuse part offers AEC-Q101 automotive qualification and carries a capacitance specification of 305pF @ 1MHz. Both operate across -65°C to 150°C.

Q: Can SM6T33CA or SM6T33CAY be used as direct replacements? A: No. While these STMicroelectronics parts maintain the same 28.2V standoff and 31.4V breakdown voltages, they exhibit significantly different electrical characteristics: 59V clamping voltage (versus 45.7V) and 68A peak pulse current at 8/20µs (versus 13.1A at 10/1000µs). These parts are suitable only when enhanced transient suppression is required and the higher clamping voltage is acceptable.

Q: What is the significance of AEC-Q101 qualification? A: AEC-Q101 is an automotive qualification standard. Parts carrying this qualification (P6SMB33CAH, SM6T33CA, SM6T33CAY, SZP6SMB33CAT3G, TPSMB33CA) meet automotive reliability and quality requirements. Selection of AEC-Q101 qualified parts is necessary for automotive applications.

Q: Does packaging format affect electrical performance? A: No. Packaging format (Tape & Box, Tape & Reel, Cut Tape) affects procurement, storage, and assembly processes but does not alter electrical specifications. The DO-214AA (SMB) package remains consistent across all variants.

Q: Which substitute offers the widest operating temperature range? A: SMBJP6KE33CA-TP and TPSMB33CA both operate across -55°C to 175°C, providing the widest temperature range among the listed substitutes. The original P6SMB33CA-M3/5B operates across -65°C to 150°C.

Q: Are all listed parts RoHS compliant? A: Yes. All listed parts are either ROHS3 compliant or RoHS compliant. Moisture sensitivity level is MSL 1 (Unlimited) across all variants, indicating no moisture sensitivity restrictions.

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