The LA731JTTD222J1000 is a PTC thermistor manufactured by KOA Speer. It is 0603 in size, RoHS compliant, and is a negative temperature coefficient thermistor. It has a resistance of 22K ohms at 25 degrees C, a 20±10% tolerance, and a power rating of 0.25W. It can be used in a variety of applications such as temperature control, temperature sensing, inrush current limitation, and protection circuits.