Ferroxcube EFD cores and accessories EFD20 COIL FORMERS General data PARAMETER SPECIFICATION Coil former material phenolformaldehyde (PF), glass reinforced, flame retardant in accordance with “UL94 V-0”; UL file number E41429 Solder pad material copper-tin alloy (CuSn), tin-lead alloy (SnPb) plated Maximum operating temperature 180 °C, “IEC 60085”, class H Resistance to soldering heat “IEC 60068-2-20”, Part 2, Test Tb, method 1B, 350 °C, 3.5 s Solderability “IEC 60068-2-20”, Part 2, Test Ta, method 1, 235 °C, 2 s Winding data for EFD20 coil former (SMD) with 10-solder pads NUMBER OF SECTIONS NUMBER OF SOLDER PADS WINDING AREA (mm2) MINIMUM WINDING WIDTH (mm) AVERAGE LENGTH OF TURN (mm) 1 12 27.7 13.5 39.6 TYPE NUMBER CSHS-EFD20-1S-12P