Silicon Protection Arrays Application Guide USB1.1 Considerations: ● Each port operates at either 1.5Mbps or 12Mbps (low and full speed respectively) → Slower speeds can tolerate higher capacitance devices ● Requires 2 channels of data line protection per port (i.e. D+/D-) → A 4 channel device can be useful if protecting a USB stack of 2 ports to make the ESD footprint as small as possible → VBUS can be protected separately with a single channel device (0402 shown) Application Schematic: USB Port USB Controller VBUS D+ DOutside World IC SP05 SP1003 Case GND Signal GND Case GND Recommended SPA Devices: SP0502BAJTG ESD Level (Contact) ±20kV I/O Capacitance 30pF SP1001-02XTG ±8kV SP1001-04XTG SP1003-01DTG Ordering Number ©2009 Littelfuse, Inc # of Channels VRWM Packaging 2 5.5V SC70-3 12pF 2 5.5V SOT553 ±8kV 12pF 4 5.5V SOT553 ±25kV 30pF 1 5.0V SOD723 5