ESD protection for USB 2.0

9 July 2008 Circuit & System Protection

STMicroelectronics has met the complete ESD (electro-static discharge) protection requirements for High-Speed USB, including Vbus, in a QFN-6 device measuring 1,0 x 1,45 x 0,65 mm. With 0,85 pF maximum capacitance at 240 MHz, the USBULC6-2M6 minimises distortion and helps designers meet the 10 pF maximum specified line loading for operation up to 480 Mbps.

The compact footprint and low package height make the device suitable for mobile phones, handheld computers, personal media players and other portable high-speed communicators requiring IEC61000-4-2 protection. The device meets level 4 specifications to 15 kV air-gap discharge and 8 kV contact discharge, and has a breakdown voltage of 6,1 V. In addition, the low maximum leakage current of 0,5 μA reduces power consumption and preserves battery life.

The USBULC6-2M6 is internally optimised for maximum signal transparency, and features a go-through pin arrangement to simplify board layout and preserve impedance matching of the complete data line.

By providing two complementary protection-diode networks, with capacitance matching within 0,1 pF, the device is suitable for a wide range of high-speed differential and single-ended signalling applications. Zero insertion loss is specified up to 3 GHz, allowing use in applications such as Gigabit Ethernet as well as future high-speed protocols.

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