Vishay General Semiconductor - Diodes Division SMBG17A-M3/52

Overview

SMBG17A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 17 V stand-off voltage (V_WM), 18.9–20.9 V breakdown voltage (V_BR) at 1 mA, 27.6 V maximum clamping voltage (V_C) at 21.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial I/O modules, and DC power rails.

For engineers reviewing the SMBG17A-M3/52 datasheet, SMBG17A-M3/52 pinout, SMBG17A-M3/52 application, or SMBG17A-M3/52 equivalent, this page delivers verified electrical parameters, package dimensions, AEC-Q101 qualification status, thermal resistance data, and real-world protection use cases - all specific to the M3 halogen-free, RoHS-compliant variant in SMBG (DO-215AA) package.

Technical Context

This unidirectional TVS diode operates as a fast-acting shunt clamp, responding in <1 ps to transients and limiting voltage excursions before sensitive downstream circuitry sustains damage. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at V_WM) and long-term reliability under repetitive surge stress.

Rated for -55 °C to +150 °C junction temperature, it supports high-reliability automotive and industrial environments. With R_θJA = 100 °C/W and R_θJL = 20 °C/W, thermal management is optimized for standard 0.2" × 0.2" copper pads - enabling effective dissipation of 600 W pulses without derating below 25 °C ambient.

Key Specifications

Pinout & Package

SMBG17A-M3/52 uses the SMBG (DO-215AA) surface-mount package: 2-terminal, gull-wing leaded case with cathode band marking. Dimensions: 6.48 mm × 5.97 mm × 2.41 mm (L × W × H); lead pitch 2.16 mm; matte tin-plated terminals compliant with J-STD-002 and JESD 22-B102.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBG17AHE3/52, the SMBG17A-M3/52 offers halogen-free construction without sacrificing AEC-Q101 qualification or electrical specs; versus SMBJ17A-M3/52, it delivers tighter clamping (27.6 V vs. 29.2 V) in a smaller DO-215AA footprint - critical for space-constrained automotive and industrial modules.

Availability

SMBG17A-M3/52 is available at Aetrix Electronics and suitable for automotive ECU design, industrial I/O protection, and telecom power entry applications requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.

Supply support for SMBG17A-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, efficiency, and application-specific optimization.

The SMBG TransZORB® series targets high-speed, high-power transient suppression in automotive, industrial, and communications systems - engineered for precise clamping, low leakage, and robust surge endurance in harsh environments.

FAQ

What is the maximum clamping voltage of SMBG17A-M3/52 and under what test condition?

The SMBG17A-M3/52 has a maximum clamping voltage (V_C) of 27.6 V, measured at a peak pulse current (I_PPM) of 21.7 A using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and reflects worst-case device behavior during surge events - critical for verifying compatibility with downstream IC voltage tolerances in the SMBG17A-M3/52 application.

Is SMBG17A-M3/52 suitable for automotive applications, and what qualification does it hold?

Yes, SMBG17A-M3/52 is AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling, mechanical shock, and humidity exposure. It meets the stringent requirements for under-hood and chassis-mounted electronics, making it appropriate for engine control units, body control modules, and ADAS sensors where SMBG17A-M3/52 must sustain operation across -40 °C to +125 °C ambient conditions.

How does the M3 suffix differ from E3 or HE3 in SMBG17A-M3/52 ordering codes?

The M3 suffix in SMBG17A-M3/52 indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. In contrast, E3 denotes standard RoHS compliance without halogen-free assurance, while HE3 adds AEC-Q101 qualification to the E3 base. The SMBG17A-M3/52 thus provides both environmental compliance and automotive reliability - distinct from E3 (industrial only) and HE3 (AEC-Q101 + RoHS, but not halogen-free).

What is the thermal resistance of SMBG17A-M3/52, and how does it affect PCB layout?

SMBG17A-M3/52 has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W and junction-to-lead resistance (R_θJL) of 20 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This means effective heat dissipation requires adherence to the recommended pad layout - undersized pads increase R_θJA, risking thermal runaway during repetitive surges. Proper layout ensures SMBG17A-M3/52 maintains rated 600 W pulse capability without derating above 25 °C ambient.

Can SMBG17A-M3/52 be used in bidirectional protection circuits?

No - SMBG17A-M3/52 is a unidirectional TVS diode, identifiable by its cathode band marking and specified V_BR only in the reverse direction. For bidirectional protection, Vishay offers the SMBG17CA-M3/52 variant (with CA suffix), which provides symmetrical clamping in both polarities. Using SMBG17A-M3/52 in AC or floating-signal applications risks forward conduction and failure; always verify polarity alignment in the SMBG17A-M3/52 circuit implementation.