The TEN 3-1221N from Traco Power is a DC to DC Converter with Input Voltage 9 to 18 V, Output Voltage 1 5 V, Output Current 1 0.25 A, Output Power 3 W, Output Voltage 2 -5 V. Tags: Through Hole, Buck/Step down. More details for TEN 3-1221N can be seen below.