The 3699-S12 from Modular Devices is a DC to DC Converter with Input Voltage 6 to 17 V, Output Voltage 1 11.9 to 12.1 V, Output Current 1 1.67 A, Output Power 20000 mW, Isolation Voltage 100 to 500 Vdc. Tags: Through Hole, Module. More details for 3699-S12 can be seen below.