Vishay General Semiconductor - Diodes Division P6SMB440AHE3_A/I

Overview

P6SMB440AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P6SMB series, designed for high-energy surge protection on DC power rails and signal lines. It features a 440 V standoff voltage (VWM), 462 V maximum breakdown voltage (VBR), 600 W peak pulse power rating (10/1000 μs), and clamps transients to 602 V at 1 A peak pulse current - suitable for protecting high-voltage industrial power supplies and telecom rectifier outputs.

For engineers reviewing the P6SMB440AHE3_A/I datasheet, P6SMB440AHE3_A/I pinout, P6SMB440AHE3_A/I application, or P6SMB440AHE3_A/I equivalent, key selection criteria include its AEC-Q101 qualification (HE3 suffix), SMB (DO-214AA) package compatibility with automated SMT assembly, low leakage (<1 μA at VWM), and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.

Technical Context

This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche behavior and fast response (<1 ns). Its 600 W peak pulse power rating is defined per 10/1000 μs waveform at 0.01% duty cycle, with derating above 25 °C ambient per Fig. 2 of the datasheet.

The device is rated for TJ = -65 °C to +150 °C operation, meets MSL Level 1 per J-STD-020 (peak reflow ≤ 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification for automotive-grade reliability.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile case with molded UL 94 V-0 compound. Cathode identified by black band on one end; anode is opposite terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ440A-E3/5B and 1.5KE440A, P6SMB440AHE3_A/I uniquely combines AEC-Q101 qualification, SMB surface-mount compatibility, and optimized thermal performance for high-reliability automotive and industrial power systems - without requiring PCB redesign or sacrificing surge margin.

Availability

P6SMB440AHE3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, high-voltage sensor interfaces, and automotive on-board chargers requiring stable component supply and long-term lifecycle support.

Supply support for P6SMB440AHE3_A/I 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 and application-specific performance.

The P6SMB Series targets high-energy transient suppression in space-constrained, high-reliability applications - engineered for automotive, industrial, and telecom systems demanding AEC-Q101 compliance and robust 600 W surge handling in SMB packages.

FAQ

What is the clamping voltage of P6SMB440AHE3_A/I at its rated peak pulse current?

The P6SMB440AHE3_A/I clamps to a maximum of 602 V when subjected to a 1 A peak pulse current with a 10/1000 μs waveform. This value is measured under standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The P6SMB440AHE3_A/I maintains this clamping performance across its full operating temperature range.

Is P6SMB440AHE3_A/I suitable for automotive applications?

Yes, P6SMB440AHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and documentation in Vishay's P6SMB datasheet (Rev. 09-Jan-2024). It is specifically intended for automotive power electronics including on-board chargers, DC-DC converters, and battery disconnect units where high-temperature operation (−65 °C to +150 °C) and robust surge immunity are required. The P6SMB440AHE3_A/I meets all stress tests defined in AEC-Q101, including temperature cycling and humidity bias.

What is the reverse leakage current of P6SMB440AHE3_A/I at its maximum standoff voltage?

At its maximum standoff voltage of 376 V (VWM), the P6SMB440AHE3_A/I exhibits a reverse leakage current of less than 1 μA, measured at TA = 25 °C. This ultra-low leakage ensures minimal power loss and signal interference in high-impedance monitoring circuits or always-on systems. The P6SMB440AHE3_A/I maintains leakage below 5 μA even at elevated temperatures up to 125 °C, per datasheet characterization.

Does P6SMB440AHE3_A/I have a bidirectional variant?

No, P6SMB440AHE3_A/I is strictly unidirectional, indicated by the "A" suffix and cathode band marking. Bidirectional variants in the P6SMB family use the "CA" suffix (e.g., P6SMB440CA) and lack polarity marking. The P6SMB440AHE3_A/I is designed for DC rail protection where polarity is fixed; using it in AC or bidirectional signal paths would result in forward conduction during negative half-cycles and potential failure.

What PCB pad layout is required to achieve the rated 600 W peak pulse power for P6SMB440AHE3_A/I?

To achieve the full 600 W peak pulse power rating, P6SMB440AHE3_A/I must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, as specified in the Vishay P6SMB datasheet Figure 2 and "Mechanical Data" section. Smaller pads increase thermal resistance and reduce effective surge capability. The P6SMB440AHE3_A/I thermal performance degrades linearly above 25 °C ambient unless this pad area is maintained.