The A1203S-1WR3 from MORNSUN is a DC to DC Converter with Input Voltage 10.8 to 13.2 V, Output Voltage 1 3.3 V, Output Current 1 15 to 152 mA, Output Power 1000 mW, Output Voltage 2 -3.3 V. Tags: Through Hole, Buck/Step down. More details for A1203S-1WR3 can be seen below.