The WR12X45R3FTL is a surface-mount chip resistor with a 4-terminal configuration, rated at 45.3 ohms (±1%) and a power rating of 1/4 watt. It is constructed from the following materials: tin-plated copper, nickel-plated-manganese, and a flame-retardant epoxy coating. This device is RoHS compliant and is manufactured by Walsin, one of the leading providers of small, low-power components. The WR12X45R3FTL is often used in applications where ultra-low voltage control needs to be achieved. Its low failure rate and high reliability makes it a popular choice for small-signal, low-voltage applications.