Vishay General Semiconductor - Diodes Division SMBJ14A-M3/52

Overview

SMBJ14A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 14 V stand-off voltage (V_WM), 23.2 V maximum clamping voltage (V_C) at 25.9 A peak pulse current (I_PPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed on power rails and I/O lines of industrial sensor interfaces.

For engineers reviewing the SMBJ14A-M3/52 datasheet, SMBJ14A-M3/52 pinout, SMBJ14A-M3/52 application, or SMBJ14A-M3/52 equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at V_WM, 15.6–17.2 V breakdown voltage range (V_BR), 150 °C max junction temperature, and halogen-free RoHS-compliant M3 suffix construction.

Technical Context

This TVS diode operates as a clamping device that remains high-impedance below V_WM = 14 V and rapidly transitions to low-impedance conduction above its breakdown threshold (V_BR = 15.6–17.2 V @ 1 mA). Its response time is sub-nanosecond, enabling effective suppression of fast-rising transients such as IEC 61000-4-2 ESD (±30 kV air, ±25 kV contact) and IEC 61000-4-5 surge events.

The SMBJ14A-M3/52 uses a glass-passivated silicon junction for stable performance and low incremental surge resistance. It is rated for repetitive 0.01% duty cycle pulses and derates linearly above 25 °C ambient per Fig. 2, with thermal resistance R_θJA = 100 °C/W on standard 0.2" × 0.2" copper pads.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, M3 suffix. Cathode indicated by band marking on body; anode is unmarked end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ14A-M3/52, the E3 variant trades halogen-free status for lower cost in non-regulated environments, while the 14CA variant enables AC signal protection but requires circuit-level validation of bidirectional conduction paths.

Availability

SMBJ14A-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and telecom power supply input applications requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.

Supply support for SMBJ14A-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 application-specific optimization.

The SMBJ series is engineered for robust transient suppression in harsh electromagnetic environments, targeting industrial automation, automotive subsystems, and infrastructure equipment where long-term parametric stability and surge survivability are critical.

FAQ

What is the clamping voltage of SMBJ14A-M3/52 under a 10/1000 µs surge?

The SMBJ14A-M3/52 has a maximum clamping voltage (V_C) of 23.2 V when subjected to its rated peak pulse current of 25.9 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ14A-M3/52 maintains this clamping performance across its qualified operating temperature range.

Is SMBJ14A-M3/52 suitable for automotive applications?

The SMBJ14A-M3/52 itself is commercial-grade and halogen-free but not AEC-Q101 qualified. However, Vishay offers the functionally identical SMBJ14A-HM3_X variant (e.g., SMBJ14A-HM3_A) which carries full AEC-Q101 qualification for automotive use. For non-automotive industrial or telecom designs, the SMBJ14A-M3/52 delivers validated 150 °C junction temperature operation and MSL Level 1 reflow compatibility.

How does the M3 suffix differ from E3 in SMBJ14A-M3/52?

The M3 suffix indicates halogen-free, RoHS-compliant construction using bromine-free flame retardants in the molding compound, whereas E3 denotes RoHS compliance with traditional brominated compounds. Both share identical electrical parameters, SMB package dimensions, and thermal characteristics. The SMBJ14A-M3/52 meets stricter environmental mandates such as China RoHS II and EU Directive 2015/863 amending RoHS 2.

What is the reverse leakage current of SMBJ14A-M3/52 at its stand-off voltage?

The SMBJ14A-M3/52 exhibits a maximum reverse leakage current (I_D) of 1.0 µA when biased at its rated stand-off voltage (V_WM) of 14 V and tested at 25 °C ambient. This ultra-low leakage preserves signal integrity on high-impedance nodes and minimizes quiescent power loss in battery-operated systems. The SMBJ14A-M3/52 maintains leakage below 10 µA up to 125 °C per datasheet characterization.

Can SMBJ14A-M3/52 be used for bidirectional signal line protection?

No - the SMBJ14A-M3/52 is strictly unidirectional and must be oriented with its cathode toward the protected line. For bidirectional protection (e.g., RS-485, CAN, AC-coupled audio), the SMBJ14CA-M3/52 variant is required. Using SMBJ14A-M3/52 on bidirectional lines risks forward conduction during negative half-cycles and invalidates clamping performance. Always verify polarity alignment before PCB placement of SMBJ14A-M3/52.