Vishay General Semiconductor - Diodes Division SMBJ6.5AHE3/5B

Overview

SMBJ6.5AHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 6.5 V stand-off voltage (V_WM), 7.22–7.98 V breakdown voltage (V_BR) at 10 mA, 11.2 V maximum clamping voltage (V_C) at 53.6 A peak pulse current, and 600 W peak pulse power rating with a 10/1000 µs waveform.

For engineers reviewing the SMBJ6.5AHE3/5B datasheet, SMBJ6.5AHE3/5B pinout, SMBJ6.5AHE3/5B application, or SMBJ6.5AHE3/5B equivalent, key selection considerations include its AEC-Q101 qualification (via HE3 suffix), RoHS-compliant matte tin-plated leads, MSL Level 1 moisture sensitivity, and suitability for automotive, industrial, and telecom signal-line protection where fast response (<1 ns), low clamping ratio (V_C/V_BR ≈ 1.48), and 150 °C max junction temperature are critical.

Technical Context

This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for stable avalanche behavior under repetitive surge conditions. Its thermal resistance (R_θJA = 100 °C/W) and junction-to-lead resistance (R_θJL = 20 °C/W) support reliable operation on standard 0.2" × 0.2" copper pads without heatsinking for short-duration transients.

The SMBJ6.5AHE3/5B complies with ANSI/IEEE C62.35 surge standards and delivers 500 A peak pulse current (I_PPM) at 10/1000 µs, with a temperature coefficient of V_BR at +0.061 %/°C - enabling predictable performance across -55 °C to +150 °C operating range while maintaining <1 μA reverse leakage at V_WM.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ6.5AHE3/5B, the E3/5B alternative offers identical protection performance at lower cost but lacks automotive qualification, while the SMAJ6.5AHE3/A reduces board area at the expense of 33 % lower surge energy absorption and higher thermal resistance - making SMBJ6.5AHE3/5B the optimal choice for AEC-Q101-compliant, high-reliability 600 W surge protection.

Availability

SMBJ6.5AHE3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O interfaces, and telecom power supply protection requiring stable component supply, full AEC-Q101 traceability, and RoHS/halogen-free compliance.

Supply support for SMBJ6.5AHE3/5B 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 SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against lightning, ESD, and inductive switching surges is non-negotiable.

FAQ

What is the maximum clamping voltage of SMBJ6.5AHE3/5B and under what test condition is it specified?

The SMBJ6.5AHE3/5B has a maximum clamping voltage (V_C) of 11.2 V, measured at a peak pulse current (I_PPM) of 53.6 A using the standardized 10/1000 µs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuits during worst-case transient events and is validated per ANSI/IEEE C62.35 test methodology.

Is SMBJ6.5AHE3/5B suitable for automotive applications, and what qualification does it hold?

Yes, SMBJ6.5AHE3/5B is explicitly qualified to AEC-Q101 for automotive use, as confirmed by the "HE3" suffix in its part number and documentation in Vishay's 88392 datasheet. This qualification covers stress tests including temperature cycling, humidity bias, mechanical shock, and accelerated life testing - ensuring reliability in engine control, body electronics, and ADAS subsystems.

What is the standoff voltage (V_WM) of SMBJ6.5AHE3/5B, and how does it relate to system operating voltage?

The standoff voltage (V_WM) of SMBJ6.5AHE3/5B is 6.5 V, representing the maximum continuous reverse voltage the device can block without entering avalanche conduction. It is selected to be ≥10–20 % above the nominal system voltage (e.g., 5 V logic rails) to prevent false triggering during normal operation while allowing headroom for ripple and tolerance.

Does SMBJ6.5AHE3/5B have a defined polarity, and how is it marked on the package?

Yes, SMBJ6.5AHE3/5B is a unidirectional TVS diode with defined polarity: the cathode is marked by a visible band on the SMB (DO-214AA) package body. During circuit layout, the banded end must connect to the protected line (e.g., VBUS or signal), while the anode connects to ground - reversing this orientation disables clamping functionality.

What packaging format is used for SMBJ6.5AHE3/5B, and what is the reel quantity?

SMBJ6.5AHE3/5B is supplied in 13-inch diameter plastic tape and reel format with a base quantity of 3200 units per reel, as indicated by the "/5B" suffix in the ordering code. This packaging supports high-speed automated pick-and-place assembly and complies with EIA-481 standards for SMT manufacturing.