The SRV05-4.TCT is an ESD suppressor/TVS diode from Semtech, specifically a RAILCLAMP series. This component is used to protect four-line circuits from electrical overstress, such as voltage spikes, transients, and other sources of electromagnetic radiation interference. It contains four diodes, each rated for 5V and with a maximum clamping voltage of 3KV. The component is LFREE, meaning it has an ultra-low static power consumption, making it ideal for use in low-power applications.