Vishay General Semiconductor - Diodes Division P6SMB6.8AHE3_A/I

Overview

P6SMB6.8AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 6.45 V minimum breakdown voltage (V_BR), 5.80 V maximum stand-off voltage (V_WM), 10.5 V clamping voltage (V_C) at 57.1 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.

For engineers reviewing the P6SMB6.8AHE3_A/I datasheet, P6SMB6.8AHE3_A/I pinout, P6SMB6.8AHE3_A/I application, or P6SMB6.8AHE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 100 °C/W junction-to-ambient thermal resistance, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.

Technical Context

This TVS diode operates as a clamping device triggered by reverse-biased avalanche breakdown above V_WM, delivering fast response (<1 ns) and stable clamping during transient events. Its glass-passivated junction ensures robust surge handling and long-term reliability under repetitive 0.01% duty cycle pulses.

The device is rated for -65 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile case with molded UL 94 V-0 compound; cathode indicated by band on one end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ6.8A-E3/52, P6SMB6.8AHE3_A/I delivers 50% higher peak pulse power and automotive qualification; versus 1.5SMC6.8A, it trades 2.5× smaller footprint and lower cost for reduced power handling and thermal dissipation capability.

Availability

P6SMB6.8AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 compliance and SMT-ready packaging.

Supply support for P6SMB6.8AHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The P6SMB Series targets high-reliability transient suppression in space-constrained, thermally demanding environments - engineered for automotive, industrial, and communications systems where failure modes must be rigorously controlled.

FAQ

What is the clamping voltage of the P6SMB6.8AHE3_A/I under maximum rated surge conditions?

The P6SMB6.8AHE3_A/I exhibits a maximum clamping voltage (V_C) of 10.5 V when subjected to its rated 57.1 A peak pulse current (I_PPM) with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88370) and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The P6SMB6.8AHE3_A/I maintains this clamping performance across its full operating temperature range.

Is the P6SMB6.8AHE3_A/I qualified for automotive applications?

Yes, the P6SMB6.8AHE3_A/I is AEC-Q101 qualified, as confirmed by its "HE3" suffix and documentation in the Vishay P6SMB Series datasheet (Revision: 09-Jan-2024). This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge robustness required for automotive electronic control units. The P6SMB6.8AHE3_A/I is explicitly designated for use in engine compartments, body electronics, and ADAS subsystems where reliability under vibration and thermal extremes is mandatory.

What does the "_A/I" suffix indicate in P6SMB6.8AHE3_A/I?

The "_A/I" suffix in P6SMB6.8AHE3_A/I specifies packaging configuration: "A" denotes the base part variant (unidirectional, 6.8 V nominal), "I" indicates 13-inch diameter plastic tape-and-reel delivery containing 3200 units per reel. This format supports high-volume automated pick-and-place assembly. The P6SMB6.8AHE3_A/I also carries the "HE3" designation confirming RoHS-compliance and AEC-Q101 qualification, distinguishing it from commercial-grade variants like P6SMB6.8A-E3/52.

How does the thermal performance of P6SMB6.8AHE3_A/I affect PCB layout?

The P6SMB6.8AHE3_A/I has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surges, PCB layout must provide at least this pad area for each terminal and avoid excessive trace length or narrow routing that increases thermal impedance. The P6SMB6.8AHE3_A/I's MSL Level 1 rating further requires no pre-baking prior to reflow, simplifying manufacturing flow.

Can the P6SMB6.8AHE3_A/I replace bidirectional TVS diodes in circuit designs?

No, the P6SMB6.8AHE3_A/I is strictly unidirectional and must not be substituted for bidirectional TVS diodes such as P6SMB6.8CAHE3_A/I. Its cathode band marks polarity, and it conducts only during reverse overvoltage events - forward conduction is limited to 3.5 V at 50 A per datasheet. Using the P6SMB6.8AHE3_A/I in AC-coupled or differential signal paths risks failure during positive transients. Always verify polarity alignment and transient directionality before selecting the P6SMB6.8AHE3_A/I.