Vishay General Semiconductor - Diodes Division P6SMB350A-M3/52

Overview

P6SMB350A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal paths. It features a 350 V standoff voltage (VWM), 368 V maximum breakdown voltage (VBR), 482 V clamping voltage at 1.24 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in industrial motor drives, telecom power supplies, and automotive ECUs.

For engineers reviewing the P6SMB350A-M3/52 datasheet, P6SMB350A-M3/52 pinout, P6SMB350A-M3/52 application, or P6SMB350A-M3/52 equivalent, key selection criteria include clamping performance under repetitive surges, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), and SMB (DO-214AA) package compatibility with automated SMT assembly.

Technical Context

This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient overvoltage exceeds VBR (333–368 V), then rapidly avalanches to limit voltage across protected circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at 300 V) and fast response time (<1.0 ns).

Designed for 10/1000 μs surge waveforms at 0.01% duty cycle, P6SMB350A-M3/52 delivers 600 W peak pulse power while maintaining low incremental surge resistance and meets J-STD-020 MSL Level 1 (260 °C reflow peak). It is not AEC-Q101 qualified - the HM3_D variant is required for automotive use.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band; anode is unmarked end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommendation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMAJ350A and 1.5SMC350A, P6SMB350A-M3/52 delivers optimal balance of 600 W surge capability, SMB footprint compatibility, and 100 °C/W thermal resistance - making it ideal for space-constrained industrial power rails where standardized SMT assembly and halogen-free compliance are mandatory.

Availability

P6SMB350A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and PLC I/O modules requiring stable component supply, halogen-free compliance, and repeatable surge performance across production batches.

Supply support for P6SMB350A-M3/52 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.

The P6SMB Series targets cost-sensitive, high-volume surge protection needs in industrial, telecom, and consumer systems - delivering standardized 600 W TVS performance in compact SMB packages with rigorous process control and qualification.

FAQ

What is the maximum clamping voltage of P6SMB350A-M3/52 under surge conditions?

The maximum clamping voltage (VC) of P6SMB350A-M3/52 is 482 V at a peak pulse current (IPPM) of 1.24 A with a 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring safe operation of downstream 500 V-rated MOSFETs or controllers. P6SMB350A-M3/52 maintains this clamping performance across its full operating temperature range (-65 °C to +150 °C).

Is P6SMB350A-M3/52 suitable for automotive applications?

P6SMB350A-M3/52 is not AEC-Q101 qualified; it is rated for commercial-grade operation only. For automotive use, Vishay specifies the HM3_D variant (e.g., P6SMB350AHM3_D/H), which undergoes additional stress testing and screening. Using P6SMB350A-M3/52 in automotive ECUs may compromise long-term reliability under temperature cycling, vibration, and extended lifetime requirements. Always verify qualification status via the full ordering code before deployment.

How does the M3 suffix affect P6SMB350A-M3/52 compliance and processing?

"M3" denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. Unlike E3 variants, M3 parts eliminate brominated flame retardants from the molding compound while retaining identical electrical and thermal specifications. The M3 suffix also confirms JESD 201 Class 2 whisker resistance - essential for high-reliability industrial assemblies subject to long-term storage or thermal cycling.

What is the thermal resistance of P6SMB350A-M3/52, and how does it impact layout?

P6SMB350A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet Figure 6. To maintain safe junction temperatures below 150 °C during repetitive surges, designers must ensure adequate copper area and avoid routing heat-sensitive components nearby. Reducing pad size increases RθJA and risks thermal runaway under sustained surge duty.

Can P6SMB350A-M3/52 be used in bidirectional configurations?

No - P6SMB350A-M3/52 is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., P6SMB350CA). Attempting to use P6SMB350A-M3/52 in bidirectional signal lines (e.g., RS-485, CAN) will result in forward conduction during negative transients, causing failure. For symmetric protection, select the CA version or pair two unidirectional devices in series opposition.