Vishay General Semiconductor - Diodes Division SMBJ100A-M3/52

Overview

SMBJ100A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 100 V stand-off voltage (VWM), 111–123 V breakdown voltage (VBR) at 1 mA, 162 V maximum clamping voltage (VC) at 3.7 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.

For engineers reviewing the SMBJ100A-M3/52 datasheet, SMBJ100A-M3/52 pinout, SMBJ100A-M3/52 application, or SMBJ100A-M3/52 equivalent, key selection criteria include clamping performance under 3.7 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (111–123 V), it avalanches to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM).

Designed for single-pulse transients per IEC 61000-4-5 (10/1000 µs), it delivers 600 W peak power dissipation with 0.01 % duty cycle, and supports repetitive surges only under strict derating above TA = 25 °C per Fig. 2. Junction temperature remains within -55 °C to +150 °C operating range.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking on one end. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), with 1.52 mm minimum terminal width and 2.159 mm max pad footprint length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ100A-M3/52, the E3 variant offers baseline RoHS compliance at lower cost, while the HM3_B/H adds AEC-Q101 qualification for automotive use - neither is pin-compatible with bidirectional variants (e.g., SMBJ100CA), and all share identical SMB footprint and thermal design rules.

Availability

SMBJ100A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, halogen-free compliance, and repeatable 600 W transient suppression performance.

Supply support for SMBJ100A-M3/52 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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.

The SMBJ series targets high-energy transient suppression in space-constrained DC systems, engineered for robustness in industrial, telecom, and automotive power rails where precise clamping and thermal stability are critical.

FAQ

What is the maximum clamping voltage of SMBJ100A-M3/52 under rated surge conditions?

The SMBJ100A-M3/52 has a maximum clamping voltage (VC) of 162 V at 3.7 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during full-rated transient events. The SMBJ100A-M3/52 maintains this clamping performance consistently across its qualified temperature range.

Is SMBJ100A-M3/52 suitable for automotive applications?

SMBJ100A-M3/52 is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ100AHM3_B/H variant, which carries AEC-Q101 qualification and extended validation. The SMBJ100A-M3/52 may be used in non-safety-critical automotive subsystems where qualification is not mandated, but designers must validate reliability independently. The SMBJ100A-M3/52 shares identical electrical specs and SMB package with qualified versions.

What does the "M3" suffix indicate in SMBJ100A-M3/52?

The "M3" suffix in SMBJ100A-M3/52 denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-20 MSL Level 1 requirements and JESD 201 Class 2 whisker resistance. It distinguishes the part from the "E3" (RoHS-compliant, not halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free) variants. The SMBJ100A-M3/52 uses matte tin-plated leads and UL 94 V-0 molding compound, aligning with green manufacturing standards.

How is polarity identified on SMBJ100A-M3/52?

SMBJ100A-M3/52 is a unidirectional TVS diode with polarity indicated by a cathode band printed on the device body - the banded end is the cathode and connects to the protected line (e.g., 100 V rail), while the unbanded end is the anode and connects to ground. This marking is visible under standard optical inspection and aligns with DO-214AA mechanical orientation. Bidirectional variants (e.g., SMBJ100CA) omit the band and have symmetric terminals.

What is the thermal resistance of SMBJ100A-M3/52, and how does it affect layout?

The SMBJ100A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking and dictates PCB copper area requirements: reducing RθJA requires increasing pad size or adding internal ground planes. Derating curves (Fig. 2) show power capability drops linearly above 25 °C ambient - at 70 °C, SMBJ100A-M3/52 supports ~70 % of its 600 W rating.