Vishay General Semiconductor - Diodes Division SMBJ16A-M3/52

Overview

SMBJ16A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 16 V stand-off voltage (V_WM), 26.0 V maximum clamping voltage (V_C) at 23.1 A peak pulse current (I_PPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed to protect MOSFETs and sensor interfaces in industrial motor drives.

For engineers reviewing the SMBJ16A-M3/52 datasheet, SMBJ16A-M3/52 pinout, SMBJ16A-M3/52 application, or SMBJ16A-M3/52 equivalent, key selection criteria include its 1.0 µA max reverse leakage at V_WM, -55 °C to +150 °C operating junction temperature range, halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a unidirectional clamping device: under normal conditions it presents high impedance above its 16 V stand-off voltage, then rapidly transitions to low-impedance conduction when transient overvoltage exceeds its 17.8–19.7 V breakdown range (V_BR at 1.0 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ps).

The SMBJ16A-M3/52 delivers 600 W surge capability per 10/1000 µs waveform with 0.01 % duty cycle, exhibits 0.089 %/°C temperature coefficient of V_BR, and maintains thermal resistance of 100 °C/W (junction-to-ambient) on standard PCB pad layout - enabling reliable protection without active cooling in space-constrained designs.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, cathode-banded unidirectional configuration. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads, MSL Level 1 (260 °C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ16A-E3/52, the SMBJ16A-M3/52 adds halogen-free compliance without sacrificing clamping performance or thermal derating; versus SMAJ16A-M3, it provides 50 % higher surge power rating and superior thermal dissipation in the same production-ready SMB footprint.

Availability

SMBJ16A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer appliance power supplies requiring stable component supply with full halogen-free compliance and MSL Level 1 handling.

Supply support for SMBJ16A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.

The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting industrial automation, automotive electronics, and telecom infrastructure where robustness and consistent clamping behavior are mandatory.

FAQ

What is the maximum clamping voltage of SMBJ16A-M3/52 under rated surge conditions?

The SMBJ16A-M3/52 has a maximum clamping voltage (V_C) of 26.0 V when subjected to its rated 23.1 A peak pulse current (I_PPM) using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and guarantees that protected downstream circuitry will not experience voltages exceeding 26.0 V during defined surge events. The SMBJ16A-M3/52 maintains this clamping performance across its full operating temperature range.

Does SMBJ16A-M3/52 meet automotive qualification standards?

The SMBJ16A-M3/52 itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMBJ16AHM3_X variant (with "_X" revision code) that is fully AEC-Q101 qualified. The SMBJ16A-M3/52 shares identical electrical characteristics, package, and thermal behavior - only the qualification status and part marking differ. For automotive applications requiring formal qualification, specify the HM3_X version.

What is the reverse leakage current specification for SMBJ16A-M3/52 at its stand-off voltage?

At its 16 V stand-off voltage (V_WM) and 25 °C ambient temperature, the SMBJ16A-M3/52 exhibits a maximum reverse leakage current (I_D) of 1.0 µA. This low leakage ensures minimal power loss in always-on circuits and preserves accuracy in precision analog signal paths. Leakage remains within specification up to +150 °C junction temperature, supporting high-reliability industrial deployments.

Can SMBJ16A-M3/52 be used in bidirectional transient protection applications?

No - SMBJ16A-M3/52 is a unidirectional TVS diode, intended for DC-biased lines where polarity is fixed (e.g., positive supply rails). For bidirectional protection (e.g., AC lines or data buses), Vishay specifies the SMBJ16CA-M3/52 variant, which has symmetrical breakdown in both directions and no cathode band. Using SMBJ16A-M3/52 on bidirectional signals would result in forward conduction during negative half-cycles, causing malfunction or damage.

What is the thermal resistance of SMBJ16A-M3/52, and how does it affect PCB layout?

The SMBJ16A-M3/52 has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain reliability under repetitive surges, designers must allocate adequate copper area and avoid excessive trace length - reducing thermal resistance improves surge endurance and extends device lifetime. The SMBJ16A-M3/52's R_θJL of 20 °C/W further supports heat transfer to solder joints.