Vishay General Semiconductor - Diodes Division SMF6V0A-M3-18

Overview

SMF6V0A-M3-18 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 6 V stand-off voltage (VRWM), 10.3 V maximum clamping voltage at 19.4 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 1063 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial sensor interfaces.

For engineers reviewing the SMF6V0A-M3-18 datasheet, SMF6V0A-M3-18 pinout, SMF6V0A-M3-18 application, or SMF6V0A-M3-18 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, reverse leakage at operating bias, thermal resistance (180 K/W), and compatibility with SOD-123W footprint constraints in space-constrained PCB layouts.

Technical Context

This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its 6.67–7.4 V reverse breakdown range. Its low incremental surge resistance ensures rapid voltage stabilization during ESD events, while the "Low Noise" technology enables sub-nanosecond response time critical for preserving signal integrity on 480 Mbps USB lines.

The SMF6V0A-M3-18 is rated for continuous operation from –65 °C to +175 °C, with junction temperature limits aligned to AEC-Q101 stress testing. Its 1.08 mm height and 3.9 × 1.9 mm footprint support automated placement and reflow soldering per J-STD-020 MSL level 1, making it suitable for automotive infotainment and industrial control modules requiring robust overvoltage resilience.

Key Specifications

Pinout & Package

SMF6V0A-M3-18 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile, cathode-banded surface-mount case compatible with SOD-123W footprint. Cathode marking is a bar on the top surface; orientation follows tape-unreeling direction per Vishay spec S8-V-3717.02-003.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ6.0A-E3/57T and TPD2E001DRYR, the SMF6V0A-M3-18 offers the optimal balance of compact DO-219AB footprint, 1063 pF capacitance tolerable for USB 2.0, and 200 W surge rating - making it ideal for cost-sensitive, space-constrained industrial and automotive interfaces where moderate bandwidth suffices.

Availability

SMF6V0A-M3-18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial RS-485 transceiver hardening requiring stable component supply across production lifecycles.

Supply support for SMF6V0A-M3-18 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, passive elements, and sensors, with leadership in power management, signal conditioning, and protection technologies.

The SMF series targets high-reliability ESD protection for automotive, industrial, and consumer interfaces, emphasizing AEC-Q101 qualification, low-profile packaging, and precise clamping performance across wide temperature ranges.

FAQ

What is the maximum clamping voltage of the SMF6V0A-M3-18 under a 10/1000 μs surge?

The SMF6V0A-M3-18 has a maximum reverse clamping voltage (VC) of 10.3 V when subjected to its rated peak pulse current of 19.4 A using a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs see limited overvoltage during transient events. The SMF6V0A-M3-18 maintains this clamping performance across its full operating temperature range of –65 °C to +175 °C.

Does the SMF6V0A-M3-18 meet AEC-Q101 qualification standards?

The SMF6V0A-M3-18 is part of Vishay's AEC-Q101-qualified SMF family, with specific variants (e.g., SMF6V0A-HE3_A18) certified for automotive use. While the -M3-18 suffix denotes tape-and-reel packaging and RoHS compliance, AEC-Q101 qualification requires the "H" grade suffix. Engineers must verify the exact ordering code (e.g., SMF6V0A-HE3_A18) for automotive applications. The SMF6V0A-M3-18 shares identical electrical specs and DO-219AB package with qualified versions.

What is the reverse leakage current of the SMF6V0A-M3-18 at its 6 V stand-off voltage?

At VRWM = 6 V and Tamb = 25 °C, the SMF6V0A-M3-18 exhibits a maximum reverse leakage current (IR) of 26 μA. This low leakage ensures minimal power loss and signal distortion in always-on interfaces such as sensor bias rails or I²C pull-up networks. Leakage remains below 100 μA up to 85 °C ambient, supporting reliable operation in industrial control cabinets.

Can the SMF6V0A-M3-18 be used in USB 3.0 applications?

No, the SMF6V0A-M3-18 is not recommended for USB 3.0 applications due to its 1063 pF typical capacitance at 0 V, which would severely degrade 5 Gbps signal integrity. USB 3.0 requires ESD protection devices with <2 pF capacitance. The SMF6V0A-M3-18 is specifically designed for lower-bandwidth interfaces like USB 2.0 (480 Mbps), HDMI DDC, and RS-485, where its clamping performance and footprint provide optimal trade-offs.

What is the thermal resistance (RthJA) of the SMF6V0A-M3-18, and how does it affect layout design?

The SMF6V0A-M3-18 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on a standard epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. This value guides thermal design: for example, at 1 W dissipation, junction temperature rises ~180 °C above ambient. Layout best practices include maximizing copper area under the cathode pad and minimizing trace length to ground to maintain effective heat dissipation and prevent thermal runaway during repetitive surges. The SMF6V0A-M3-18 relies on PCB copper for thermal management, not internal heatsinking.