Vishay General Semiconductor - Diodes Division SMF17A-M3-08

Overview

SMF17A-M3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for low-capacitance transient suppression in high-speed data lines. It features a 17 V stand-off voltage (VRWM), 27.6 V maximum clamping voltage at 7.2 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is used to safeguard USB 2.0, HDMI, and industrial sensor interfaces against electrostatic discharge.

For engineers reviewing the SMF17A-M3-08 datasheet, SMF17A-M3-08 pinout, SMF17A-M3-08 application, or SMF17A-M3-08 equivalent, key selection criteria include clamping voltage margin relative to IC I/O rail, capacitance impact on signal integrity (<324 pF at 0 V), thermal resistance (180 K/W), and AEC-Q101 qualification status for automotive-grade reliability validation.

Technical Context

This device operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) and low incremental surge resistance. Its junction temperature range spans −65 °C to +175 °C, and it sustains 50 A non-repetitive forward surge current per IEC 61000-4-5 (8.3 ms half-sine).

The SMF17A-M3-08 uses silicon planar technology with "Low Noise" design to minimize parasitic inductance and ensure stable clamping under repetitive ESD stress. It is qualified to AEC-Q101 for automotive applications and compatible with wave and reflow soldering per J-STD-020 MSL level 1 conditions (peak 260 °C).

Key Specifications

Pinout & Package

SMF17A-M3-08 is housed in the DO-219AB (SMF) package: a two-terminal, surface-mount, low-profile case with cathode marking bar. The package conforms to JEDEC outline SOD-123W and supports standard SMT assembly processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ESD protection diode applications.

Compared with SMAJ17A-E3/57T and TPD2E001DRYR, the SMF17A-M3-08 uniquely balances 17 V standoff, 27.6 V clamping, 324 pF capacitance, and AEC-Q101 qualification in a compact DO-219AB package-making it optimal for space-constrained automotive and industrial data-line protection where both voltage margin and signal integrity matter.

Availability

SMF17A-M3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and automotive sensor interface applications requiring stable component supply and full traceability.

Supply support for SMF17A-M3-08 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.

The SMF series targets high-speed data-line ESD protection with emphasis on low capacitance, fast response, and AEC-Q101 qualification-designed specifically for USB, HDMI, LVDS, and automotive serial bus interfaces.

FAQ

What is the clamping voltage specification for SMF17A-M3-08 under standard IEC 61000-4-5 surge conditions?

The SMF17A-M3-08 has a maximum clamping voltage of 27.6 V at 7.2 A peak pulse current (10/1000 μs waveform). This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. It ensures compatibility with 18–24 V logic rails and prevents overvoltage damage to downstream ICs in the SMF17A-M3-08 protection path.

Is SMF17A-M3-08 qualified to AEC-Q101, and what does that mean for automotive use?

Yes, SMF17A-M3-08 is AEC-Q101 qualified, confirming it has passed stress tests including HTGB, HTRB, AC/DC life test, and ESD per human body model (>8 kV). This qualification validates its suitability for automotive applications such as infotainment, body control modules, and sensor interfaces where reliability under temperature cycling, vibration, and ESD exposure is mandatory. The SMF17A-M3-08 meets these requirements in its DO-219AB package.

What is the typical capacitance of SMF17A-M3-08, and how does it affect high-speed signal lines?

The SMF17A-M3-08 exhibits 324 pF typical capacitance at 0 V and 1 MHz. This value directly influences signal rise/fall times and impedance matching on data lines. While appropriate for USB 2.0 (480 Mbps) and HDMI 1.4 (2.25 Gbps), it is too high for USB 3.0 or PCIe Gen3; designers must verify eye diagram margins. The SMF17A-M3-08's capacitance remains stable across bias voltage, supporting consistent performance in varying DC offset conditions.

Can SMF17A-M3-08 be used in bidirectional signal protection applications?

No - SMF17A-M3-08 is a unidirectional TVS diode, intended for circuits with defined polarity (e.g., signal-to-ground). For bidirectional protection (e.g., RS-485, CAN), a symmetric device like SMBJ17CA or dedicated dual-rail suppressor is required. Using SMF17A-M3-08 in bidirectional configurations risks reverse-bias breakdown or inadequate clamping during negative transients. Always confirm polarity alignment before deploying the SMF17A-M3-08.

What is the maximum operating temperature range for SMF17A-M3-08, and how does it impact PCB layout?

The SMF17A-M3-08 operates from −65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on a 3 mm × 3 mm Cu pad. This wide range supports under-hood automotive and industrial environments. To maintain reliability, PCB layout must provide adequate copper area for heat dissipation - undersized pads increase junction temperature and reduce surge endurance. The SMF17A-M3-08's DO-219AB footprint requires strict adherence to Vishay's recommended land pattern (1.3 × 2.9 mm) for solder joint integrity.