The diodes in WLL (wafer level leadless) packages are used in applications where miniaturisation is a priority, including touchscreen and keypad interfaces and the high-speed data ports used in mobile electronics. The SG-WWL-2-1 package has a tiny footprint of 0.58 x 0.28 x 0.15mm. It is designed for direct attachment to PCBs adjacent to a connector, such as a USB port, or an external contact point such as a control button or touchpad. Approximately 10 to 30 TVS diodes are typically used in consumer electronics products, so the form factor is important to miniaturise end products. WLL packaged devices in the company’s TVS diode portfolio include the multi-purpose diode ESD200-B1-CSP0201, which protects human/device interface points such as touchscreens, keypads/boards, buttons and audio/headset input ports. Designed to clamp ESD to a voltage level of just 12V, the diode’s bidirectional characteristics simplifies assembly onto the PCB, claims the company. The diode absorbs ESD strikes up to ±16,000V for air and contact discharge; the standard test specified by IEC61000-4-2 demands for safety at contact discharges at ±8,000V.

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