Vishay SMF14A-HE3_A08

Overview

SMF14A-HE3_A08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression in high-speed data lines. It features a 14 V stand-off voltage (VRWM), 15.6–17.3 V reverse breakdown (VBR), 23.2 V maximum clamping voltage at 8.6 A peak pulse current, and 392 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O interfaces.

For engineers reviewing the SMF14A-HE3_A08 datasheet, SMF14A-HE3_A08 pinout, SMF14A-HE3_A08 application, or SMF14A-HE3_A08 equivalent, key selection criteria include clamping performance under IEC 61000-4-2 ±30 kV ESD stress, low capacitance for signal integrity, AEC-Q101 qualification status, and compatibility with SOD-123W footprint layouts.

Technical Context

This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche junction technology to clamp transients above its breakdown threshold while maintaining low leakage (<0.1 µA at VRWM). Its low incremental surge resistance ensures rapid response and minimal voltage overshoot during 10/1000 µs surges.

Designed for board-level ESD protection, it supports wave and reflow soldering per J-STD-020 MSL level 1, with thermal resistance RthJA = 180 K/W on standard 3 mm × 3 mm Cu pads - enabling reliable operation across -65 °C to +175 °C ambient range without derating.

Key Specifications

Pinout & Package

The SMF14A-HE3_A08 is housed in the DO-219AB (SMF) package - a low-profile, surface-mount case with cathode marking bar, compatible with SOD-123W footprint and reflow profiles up to 260 °C peak temperature. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ14A-E3/57T and TPD2E001DRYR, the SMF14A-HE3_A08 uniquely combines 14 V stand-off, 392 pF capacitance, ±30 kV ESD rating, and DO-219AB footprint - making it optimal for space-constrained, high-reliability 12–14 V interface protection where signal fidelity and automotive qualification matter.

Availability

SMF14A-HE3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive body control module I/O, and industrial RS-485 transceiver port applications requiring stable component supply and long-term lifecycle assurance.

Supply support for SMF14A-HE3_A08 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 automotive, industrial, and computing markets.

The SMF series targets board-level ESD protection in compact, high-volume applications - engineered for AEC-Q101 compliance, low-profile mounting, and consistent clamping performance across temperature extremes.

FAQ

What is the maximum clamping voltage of the SMF14A-HE3_A08 under standard test conditions?

The SMF14A-HE3_A08 has a maximum clamping voltage (VC) of 23.2 V when subjected to an 8.6 A peak pulse current with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 and ensures downstream circuitry remains within safe voltage limits during surge events. The SMF14A-HE3_A08 maintains this clamping performance across its full operating temperature range of -65 °C to +175 °C.

Is the SMF14A-HE3_A08 qualified to AEC-Q101 for automotive use?

Yes, the SMF14A-HE3_A08 is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and ESD robustness per the AEC-Q101 standard. This qualification confirms its suitability for automotive applications such as body control modules, infotainment interfaces, and sensor I/O protection where reliability under thermal and mechanical stress is critical. The SMF14A-HE3_A08 meets these requirements in its DO-219AB package.

What is the typical capacitance of the SMF14A-HE3_A08 and how does it affect high-speed signal lines?

The SMF14A-HE3_A08 exhibits 392 pF typical capacitance at 0 V and 1 MHz, which is optimized for interfaces up to 100 Mbps - such as RS-485, CAN FD, and industrial I²C buses. While not intended for >480 Mbps USB 2.0 differential pairs without layout mitigation, its capacitance introduces minimal signal distortion when placed with short traces and proper grounding. The SMF14A-HE3_A08's capacitance is verified per manufacturer characterization curves and remains stable across bias voltages up to VRWM.

Does the SMF14A-HE3_A08 support automated assembly processes?

Yes, the SMF14A-HE3_A08 is fully compatible with standard SMT assembly processes, including wave and reflow soldering. It complies with J-STD-020 moisture sensitivity level 1 and supports peak reflow temperatures up to 260 °C. Its DO-219AB package uses tin-plated terminations and is supplied on 8 mm tape-and-reel formats (3K per 7″ reel, MOQ = 30K), enabling seamless integration into high-volume pick-and-place lines. The SMF14A-HE3_A08's footprint matches SOD-123W land patterns for process consistency.

How does the SMF14A-HE3_A08 compare to bidirectional TVS diodes in ESD protection design?

The SMF14A-HE3_A08 is unidirectional and optimized for DC-biased lines like 12 V power rails or single-ended signals referenced to ground. Unlike bidirectional diodes, it provides lower leakage (<0.1 µA at 14 V) and sharper turn-on near VBR, improving efficiency in asymmetric voltage environments. For AC-coupled or differential lines (e.g., RS-485), two SMF14A-HE3_A08 diodes may be used back-to-back. The SMF14A-HE3_A08's unidirectional architecture avoids the higher capacitance and leakage typical of integrated bidirectional devices.