Vishay General Semiconductor - Diodes Division SMBJ5.0A-M3/52

Overview

SMBJ5.0A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 5.0 V stand-off voltage (V_WM), 6.4–7.07 V breakdown voltage (V_BR) at 10 mA, 600 W peak pulse power (10/1000 µs), and clamps transients to ≤9.2 V at 65.2 A peak surge current - deployed in power supply inputs of industrial sensors and automotive ECUs.

For engineers reviewing the SMBJ5.0A-M3/52 datasheet, SMBJ5.0A-M3/52 pinout, SMBJ5.0A-M3/52 application, or SMBJ5.0A-M3/52 equivalent, key selection criteria include its 5.0 V V_WM, unidirectional polarity with cathode band marking, SMB (DO-214AA) package compatibility with automated SMT placement, and halogen-free RoHS-compliant construction per M3 suffix.

Technical Context

This TVS diode operates as a clamping device: under normal conditions it presents high impedance (>800 µA leakage at 5.0 V), but triggers into low-impedance conduction when reverse voltage exceeds V_BR, limiting transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and fast response (<1 ns).

Thermal performance is defined by R_θJA = 100 °C/W (on 0.2" × 0.2" copper pads) and T_J(max) = 150 °C, supporting operation in ambient temperatures up to +125 °C when derated per Fig. 2. The device meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end. Dimensions: 5.59 mm × 3.94 mm × 2.44 mm (L × W × H), compliant with UL 94 V-0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ5.0A-M3/52, the E3 variant trades halogen-free status for lower cost in commercial applications, while the 5.0CA variant enables symmetrical clamping but requires circuit redesign for polarity-agnostic placement - neither offers pin-to-pin equivalence without layout or schematic review.

Availability

SMBJ5.0A-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and telecom power systems requiring stable component supply, halogen-free compliance, and MSL Level 1 manufacturability.

Supply support for SMBJ5.0A-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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and AEC-Q qualification.

The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal integrity or thermal stability.

FAQ

What is the maximum clamping voltage of SMBJ5.0A-M3/52 under a 600 W surge?

The SMBJ5.0A-M3/52 clamps to a maximum of 9.2 V when subjected to its rated 65.2 A peak pulse current (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and represents the worst-case voltage seen by downstream components during surge events - critical for ensuring 5 V logic ICs remain within absolute maximum ratings.

Does SMBJ5.0A-M3/52 meet automotive qualification standards?

The SMBJ5.0A-M3/52 is halogen-free and RoHS-compliant but is not AEC-Q101 qualified. For automotive applications requiring AEC-Q101, the equivalent part is SMBJ5.0AHM3_B/H or SMBJ5.0AHM3_B/I - both share identical electrical specs but include full qualification testing per AEC-Q101 Rev D.

How does the M3 suffix differ from E3 in SMBJ5.0A-M3/52?

The M3 suffix denotes halogen-free, RoHS-compliant construction using bromine-free flame retardants in the molding compound, whereas E3 uses RoHS-compliant materials that may contain halogens. Both meet JESD 201 Class 2 whisker resistance and J-STD-020 MSL Level 1, but M3 satisfies stricter environmental mandates like JEDEC J-STD-609A Class 2a.

Can SMBJ5.0A-M3/52 be used on bidirectional signal lines like RS-485?

No - SMBJ5.0A-M3/52 is unidirectional and will conduct continuously if reverse-biased beyond V_WM. For RS-485 or other bidirectional interfaces, use SMBJ5.0CA-M3/52 instead, which provides symmetrical clamping and no polarity marking. Substituting the unidirectional version risks DC path shorting and functional failure.

What PCB pad layout is recommended for optimal thermal performance of SMBJ5.0A-M3/52?

Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for SMBJ5.0A-M3/52 to achieve the rated R_θJA of 100 °C/W. Smaller pads increase thermal resistance and reduce surge current handling; internal layer copper pours connected via multiple vias further improve heat dissipation in high-reliability designs.