Power line protection: surge current | 24 A - STMicroelectronics Designed with the best clamping ratio for 5 to 20 V USB-powered devices and thanks to an unequalled I PP, the ESDAxP series of 30-kV protection ICs designed for USB charging circuits provides the best-in-class surge current protection capability, and improves the lifetime of the entire circuit. Communication and Connectivity Solution Eval Boards (1).