SP1224-01UTG TVS Diode Littelfuse SP1224-01UTG TVS Diode has a lightning surge rating of 100A and is intended for USB VBUS protection. This diode features a peak pulse of 3700W and an operating temperature of -40° to +125°C. The Littelfuse SP1224 TVS Diode's small form makes this component ideal for smartphones, tablets, and other portable electronics that are footprint challenged.