XP Power - TR Series of Switching Regulators. The TR series from XP Power offers a highly reliable range of 0.5 Amp, 3 pin SIP 3T switching regulators. The series has been designed in an industry standard package, features continuous short-circuit protection and a high efficiency of up to 94%. These switching regulators have a wide input and an operating temperature from -40 °C to +80 °C. 3 Pin SIP 3T switching regulators Industry standard package Continuous short-circuit protection Wide input range -40 °C to +80 °C Operating temperature Efficiency up to 94% Pin compatible with LM78MXX