Ultra-low-capacitance TVS diodes handle high surge current load

Designed to protect voltage-sensitive components from electrostatic discharge (ESD), TDK Corp. has extended its range of transient voltage suppression (TVS) diodes with the introduction of the ultra-low clamping and capacitance (ULC) series devices that offer “extremely” low capacitance values for bidirectional overvoltage protection. The SD01005SL-ULC101 (B74111U0033M060) type offers a minimum capacitance of 0.5 pF and the SD0201SL-ULC101 (B74121U0033M060) delivers 0.6 pF, both at 1 MHz.

Designed for a maximum operating voltage of 3.3 V, the ULC products offer a low clamping voltage of 3.8 V at a peak pulse current of 8 A or 16 A at 5 V and a breakdown voltage of 6.3 V. Other key features include very short response times and an extremely low leakage current of 1 nA at 3.3 V. They are designed in accordance with IEC 61000-4-2 for an ESD contact discharge of up to 15 kV.

The TVS diodes are packaged in wafer-level chipscale packages (WLCSP) that measure 400 x 200 µm (WL-CSP01005) or 600 x 300 µm (WL-CSP0201) with a height of 100 µm in the 01005 size or 150 µm in the 0201 size. “Despite their extremely small size, the components are designed for a high surge current load of up to 7 A according to IEC 61000-4-5 (8/20 µs),” said TDK.

The diodes provide ESD protection for high-speed interface ICs and data lines such as USB 3.1, USB 3.2, HDMI, FireWire, and Thunderbolt thanks to their parasitic capacitances, clamping voltage, and small size. Typical target applications include smartphones, notebooks, tablets, wearables, and ESD-sensitive network components.

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