Vishay General Semiconductor - Diodes Division SMBJ58A-M3/52

Overview

SMBJ58A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 58 V stand-off voltage (V_WM), 64.4–71.2 V breakdown range at 1 mA, 93.6 V maximum clamping voltage at 6.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.

For engineers reviewing the SMBJ58A-M3/52 datasheet, SMBJ58A-M3/52 pinout, SMBJ58A-M3/52 application, or SMBJ58A-M3/52 equivalent, key selection considerations include its unidirectional polarity, halogen-free RoHS-compliant M3 suffix, 150 °C max junction temperature, low incremental surge resistance, and suitability for automotive-grade designs when ordered with HM3 suffix.

Technical Context

This TVS diode operates as a clamping device that remains high-impedance below V_WM = 58 V and rapidly transitions to low-impedance conduction above V_BR (min 64.4 V) to limit transient voltages. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMB package supports automated placement and meets MSL level 1 per J-STD-020.

The device handles repetitive 10/1000 µs surges up to 600 W at 0.01% duty cycle and withstands 100 A non-repetitive forward surge (8.3 ms half-sine). Thermal resistance is R_θJA = 100 °C/W (typ.) on standard 0.2" × 0.2" copper pads, enabling reliable operation in industrial and automotive environments up to +150 °C junction temperature.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking on one end. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Meets UL 94 V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ58A-E3/52, the M3 version adds halogen-free compliance without performance trade-offs; compared with SMBJ58CA-M3/52, the unidirectional SMBJ58A-M3/52 provides tighter leakage control and higher surge margin on grounded DC systems.

Availability

SMBJ58A-M3/52 is available at Aetrix Electronics and suitable for industrial 48 V power systems, automotive body electronics, telecom remote radio units, and PoE+ gateway designs requiring stable component supply, halogen-free compliance, and AEC-Q101-ready qualification path.

Supply support for SMBJ58A-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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.

The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, low leakage, and repeatable clamping performance are mandatory.

FAQ

What is the maximum clamping voltage of SMBJ58A-M3/52 at its rated peak pulse current?

The SMBJ58A-M3/52 has a maximum clamping voltage (V_C) of 93.6 V at its rated peak pulse current (I_PPM) of 6.4 A, measured with a 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The SMBJ58A-M3/52 maintains this clamping performance across its full operating temperature range.

Is SMBJ58A-M3/52 suitable for automotive applications?

SMBJ58A-M3/52 is halogen-free and RoHS-compliant, but it is not AEC-Q101 qualified in this specific M3/52 configuration. For automotive use, Vishay offers the HM3 variant (e.g., SMBJ58A-HM3_X), which adds AEC-Q101 qualification. The SMBJ58A-M3/52 remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, provided thermal and surge margins are validated per application requirements.

What does the "M3" suffix indicate in SMBJ58A-M3/52?

"M3" denotes a halogen-free, RoHS-compliant commercial-grade version of the SMBJ58A-M3/52, with matte tin-plated leads and compliance to JESD 201 Class 2 whisker resistance. It differs from the "E3" suffix (RoHS-compliant but not halogen-free) and "HM3" suffix (halogen-free + AEC-Q101 qualified). The M3 suffix confirms material content alignment with strict environmental regulations such as JEDEC J-STD-609.

How does SMBJ58A-M3/52 compare to SMBJ58CA-M3/52?

SMBJ58A-M3/52 is unidirectional with cathode-band polarity marking and optimized for DC rail protection, while SMBJ58CA-M3/52 is bidirectional with symmetrical breakdown (±64.4–71.2 V) and no polarity marking. The unidirectional SMBJ58A-M3/52 exhibits lower reverse leakage (<1 µA at 58 V) and is preferred for grounded power lines; the CA version suits AC or differential signal paths where voltage polarity reverses.

What PCB pad layout is recommended for optimal thermal performance of SMBJ58A-M3/52?

Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for SMBJ58A-M3/52 to achieve the typical R_θJA of 100 °C/W. Larger copper areas or internal thermal planes further reduce junction temperature. The SMB (DO-214AA) outline drawing confirms pad width of 0.086" min and length of 0.155", and adherence to this layout ensures reliable operation at 5.0 W power dissipation and 150 °C T_J max.