Vishay General Semiconductor - Diodes Division P6SMB300A-M3/52

Overview

P6SMB300A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P6SMB series, designed for clamping voltage transients on power and signal lines. It features a 300 V standoff voltage (VWM), 315 V minimum breakdown voltage (VBR), 414 V maximum clamping voltage (VC) at 1.45 A peak pulse current (IPPM), and 600 W peak pulse power capability with a 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom infrastructure.

For engineers reviewing the P6SMB300A-M3/52 datasheet, P6SMB300A-M3/52 pinout, P6SMB300A-M3/52 application, or P6SMB300A-M3/52 equivalent, key selection criteria include its 300 V unidirectional standoff rating, SMB (DO-214AA) package compatibility with automated placement, halogen-free RoHS compliance (M3 suffix), and suitability for high-voltage surge protection where clamping voltage margin and thermal derating above 25 °C must be verified.

Technical Context

The P6SMB300A-M3/52 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown threshold (285–315 V at 1 mA test current). Its glass-passivated junction ensures stable leakage performance (<1 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of ESD and lightning-induced surges.

Thermally, it exhibits a junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads, with maximum junction temperature rated at +150 °C. Derating of peak pulse power begins above TA = 25 °C per Figure 2, requiring layout-aware thermal design for repetitive transient events.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, cathode-banded unidirectional configuration. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ300A and 1.5SMC300A, the P6SMB300A-M3/52 delivers identical electrical protection performance in a smaller SMB package with mandatory halogen-free construction, making it optimal for modern industrial and telecom designs where material compliance and board area are prioritized over legacy footprint compatibility.

Availability

P6SMB300A-M3/52 is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom DC feeder line hardening, high-voltage sensor interface safeguarding, and MOSFET gate driver supply rail clamping requiring stable component supply and halogen-free compliance.

Supply support for P6SMB300A-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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The P6SMB series was developed for high-power, surface-mount transient suppression in space-constrained industrial and telecom systems, balancing clamping precision, surge robustness, and automated manufacturing compatibility.

FAQ

What is the maximum clamping voltage of the P6SMB300A-M3/52 under a 10/1000 μs surge?

The P6SMB300A-M3/52 has a maximum clamping voltage (VC) of 414 V when subjected to its rated peak pulse current of 1.45 A with a 10/1000 μs waveform. This value is measured at the device terminals under standardized test conditions and defines the highest voltage that will appear across the protected circuit during such a transient event. Engineers must ensure downstream components have sufficient voltage margin above this 414 V limit.

Is the P6SMB300A-M3/52 suitable for automotive applications?

No, the P6SMB300A-M3/52 is not AEC-Q101 qualified. Its ordering code lacks the HE3 or HM3 suffix required for automotive-grade variants (e.g., P6SMB300AHM3_D/H). While it shares the same die and basic construction, only versions explicitly marked with HE3 or HM3 and designated with revision codes like _B or _D meet AEC-Q101 stress testing requirements. For automotive use, P6SMB300A-M3/52 must be replaced with a qualified variant.

What does the "M3" suffix indicate in P6SMB300A-M3/52?

The "M3" suffix in P6SMB300A-M3/52 denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. It distinguishes this version from the "E3" (RoHS-compliant but not halogen-free) and "HM3" (halogen-free + AEC-Q101 qualified) variants. The M3 grade is intended for commercial and industrial applications where halogen-free materials are mandated by environmental or safety standards.

How does the thermal performance of P6SMB300A-M3/52 affect its surge handling capability?

The P6SMB300A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. Since its 600 W peak pulse rating assumes TA = 25 °C, operation at elevated ambient temperatures requires derating per Figure 2 in the datasheet - for example, at 75 °C ambient, peak pulse power drops to ~420 W. This directly impacts usable surge energy in thermally constrained enclosures.

Can P6SMB300A-M3/52 be used in bidirectional configurations?

No, P6SMB300A-M3/52 is strictly unidirectional, indicated by the "A" suffix (not "CA"). Bidirectional variants use the "CA" suffix (e.g., P6SMB300CA) and exhibit symmetrical clamping in both polarities. Using P6SMB300A-M3/52 in a bidirectional application would result in forward conduction during negative transients, causing failure. For AC or floating-line protection, only CA-suffixed parts are appropriate.