Vishay General Semiconductor - Diodes Division SMBJ6.5AHM3_A/I

Overview

SMBJ6.5AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events. It features a 6.5 V stand-off voltage (V_WM), 7.22–7.98 V breakdown voltage (V_BR) at 10 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤11.2 V at 53.6 A peak surge current - deployed on power rails and signal lines of industrial sensor interfaces and automotive ECUs.

For engineers reviewing the SMBJ6.5AHM3_A/I datasheet, SMBJ6.5AHM3_A/I pinout, SMBJ6.5AHM3_A/I application, or SMBJ6.5AHM3_A/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, MSL Level 1 reflow compatibility, and real-world clamping performance data - all confirmed from Vishay's official 88392 document (Rev. 09-Jan-2024).

Technical Context

This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking. Its silicon junction is glass passivated for stable leakage and robust surge handling, and it meets J-STD-020 MSL Level 1 (260 °C peak reflow). The device exhibits low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).

Thermal design relies on its R_θJA = 100 °C/W (typ.) and R_θJL = 20 °C/W (typ.), with derating above T_A = 25 °C per Figure 2. It supports repetitive surge duty cycles up to 0.01 % and handles 100 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for 12 V automotive power rail protection where I_FSM margin and low clamping voltage are critical.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow), matte tin-plated leads solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ6.5AHE3_A/I, the SMBJ6.5AHM3_A/I adds halogen-free compliance and AEC-Q101 qualification - essential for automotive Tier 1 suppliers - while SMAJ6.5A-M3 trades 33 % lower pulse power and inferior thermal performance for smaller size, limiting its use to non-critical ESD-only zones.

Availability

SMBJ6.5AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power supplies, and consumer USB protection requiring stable component supply and long-term lifecycle support.

Supply support for SMBJ6.5AHM3_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 SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure - balancing clamping precision, surge robustness, and manufacturability.

FAQ

What is the maximum clamping voltage of SMBJ6.5AHM3_A/I under surge conditions?

The SMBJ6.5AHM3_A/I clamps to a maximum of 11.2 V when subjected to its rated peak pulse current of 53.6 A (10/1000 µs waveform). This value is measured per Vishay's datasheet Figure 1 and Table on page 2, and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 12 V logic ICs and microcontrollers whose absolute maximum ratings typically begin at 13.5 V.

Is SMBJ6.5AHM3_A/I qualified for automotive applications?

Yes, SMBJ6.5AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix per Vishay's ordering information table (page 3). This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD, confirming suitability for under-hood and body-control module applications. The "HM3" designation also confirms halogen-free and RoHS-compliant construction required by automotive OEMs.

What does the "_A/I" suffix mean in SMBJ6.5AHM3_A/I?

The "_A/I" suffix in SMBJ6.5AHM3_A/I denotes packaging configuration: "A" indicates the revision code (per Vishay's note: "'_X' denotes revision code e.g. A, B, ..."), and "I" specifies the delivery mode - 13-inch diameter plastic tape and reel with a base quantity of 3200 units. This matches the ordering example SMBJ5.0AHM3_B/I on page 3 of document 88392.

How does SMBJ6.5AHM3_A/I compare to bidirectional variants like SMBJ6.5CA?

SMBJ6.5AHM3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection (e.g., +12 V to GND). In contrast, SMBJ6.5CA is bidirectional, has no polarity marking, and protects AC or dual-polarity signals. Electrical differences include doubled I_D limit for V_WM ≤10 V bidirectional types (note 3), and slightly higher V_BR tolerance - SMBJ6.5AHM3_A/I maintains 7.22–7.98 V, while SMBJ6.5CA is 6.40–7.25 V per datasheet table.

What is the thermal resistance profile of SMBJ6.5AHM3_A/I, and how does it affect layout?

SMBJ6.5AHM3_A/I has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W and junction-to-lead (R_θJL) of 20 °C/W, measured on 0.2" × 0.2" copper pads per Figure 2. To maintain T_J ≤150 °C during repetitive surges, PCB layout must provide adequate copper area - reducing R_θJA via thermal vias and larger pads directly improves surge endurance and derating margin, especially in automotive ambient temperatures exceeding 85 °C.