Vishay General Semiconductor - Diodes Division P6SMB300AHM3_A/H

Overview

P6SMB300AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, rated for 300 V standoff voltage (VWM), 344 V clamping voltage (VC) at 1.45 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 μs waveform. It protects MOSFETs, ICs, and sensor signal lines in industrial power supplies and automotive ECUs against inductive switching transients.

For engineers reviewing the P6SMB300AHM3_A/H datasheet, P6SMB300AHM3_A/H pinout, P6SMB300AHM3_A/H application, or P6SMB300AHM3_A/H equivalent, key selection criteria include its 300 V VWM rating, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and low thermal resistance (RθJL = 20 °C/W) for reliable surge handling in space-constrained PCB layouts.

Technical Context

This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, designed to shunt transient energy above 300 V while maintaining low leakage (<1 μA at VWM). Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns) to ESD and lightning-induced surges.

The device uses a single silicon junction in SMB package with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal design supports 5.0 W steady-state dissipation on infinite heatsink at 50 °C ambient.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile case with molded UL 94 V-0 compound and matte tin-plated leads. Cathode identified by black band on body end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ300A-E3/52 and 1.5SMC300AHE3_A, P6SMB300AHM3_A/H delivers identical 300 V protection level with AEC-Q101 validation in the smallest qualified SMB footprint, enabling drop-in replacement in space-constrained automotive and industrial designs without sacrificing surge margin or thermal performance.

Availability

P6SMB300AHM3_A/H is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom DC feeds, and renewable energy inverters requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for P6SMB300AHM3_A/H 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 high-energy transient suppression in compact surface-mount formats, engineered for automotive, industrial, and telecom systems where space, thermal performance, and qualification rigor are critical.

FAQ

What is the clamping voltage of P6SMB300AHM3_A/H at its rated peak pulse current?

The clamping voltage (VC) of P6SMB300AHM3_A/H is 414 V at a peak pulse current (IPPM) of 1.45 A with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the maximum voltage imposed on the protected circuit during surge events. The 414 V VC ensures downstream components like 300 V-rated MOSFETs remain within safe operating limits when P6SMB300AHM3_A/H activates.

Is P6SMB300AHM3_A/H qualified for automotive applications?

Yes, P6SMB300AHM3_A/H is AEC-Q101 qualified, as indicated by the HM3 suffix in its part number. This certification confirms it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD immunity required for automotive powertrain and body electronics. Engineers can confidently deploy P6SMB300AHM3_A/H in engine control units, battery management systems, and ADAS modules where reliability is mission-critical.

What does the "HM3" suffix signify in P6SMB300AHM3_A/H?

The "HM3" suffix in P6SMB300AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., E3 or M3) and confirms compliance with automotive environmental and reliability standards. The "H" indicates 7-inch tape-and-reel packaging (750 units per reel), while "A/H" specifies revision level A in that packaging format - all verified in Vishay's official ordering information table.

How does the thermal resistance of P6SMB300AHM3_A/H affect its surge handling capability?

P6SMB300AHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, enabling rapid heat transfer from the silicon die to the PCB copper pads. This low RθJL sustains repeated 1.45 A surges without thermal runaway, especially when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads. For high-duty-cycle applications, this characteristic allows P6SMB300AHM3_A/H to maintain clamping performance where higher-RθJL alternatives would degrade.

Can P6SMB300AHM3_A/H be used in bidirectional protection circuits?

No, P6SMB300AHM3_A/H is a unidirectional TVS diode, as confirmed by its part number ending in "A" (not "CA") and explicit designation in Vishay's documentation. Bidirectional operation requires CA-suffix variants like P6SMB300CA. Using P6SMB300AHM3_A/H in bidirectional AC or differential signal paths would result in forward conduction during negative half-cycles, causing malfunction or damage. Always verify polarity marking (cathode band) and select CA variants for symmetrical transient suppression.