The SPF1K24S3R3 from Calex Manufacturing is a DC to DC Converter with Input Voltage 21.6 to 26.4 V, Output Voltage 1 3.3 V, Output Current 1 260 mA, Output Power 1 W, Isolation Voltage 3 kV. Tags: Through Hole, Buck/Step down. More details for SPF1K24S3R3 can be seen below.