The PQMCE1-S5-S3-S from CUI is a DC to DC Converter with Input Voltage 4.75 to 5.25 V, Output Voltage 1 3.3 V, Output Current 1 250 mA, Output Power 1000 mW, Isolation Voltage 1500 VDC. Tags: Surface Mount, Buck/Step down. More details for PQMCE1-S5-S3-S can be seen below.