WF NOT RECOMMENDED FOR NEW DESIGN thermal fuse built-in resistor EU features Wide resistance range and thermal cut-off temperature Resistor with quick current break ability for cement resistor and thermal fuse Products with lead-free terminations meet EU RoHS requirements. Pb located in glass material, electrode and resistor element is exempt per Annex 1, exemption 5 of EU directive 2005/95/EC dimensions and construction D W Dimensions inches (mm) d 0.1 d 0.1 Ceramic Case Type W DH P (R. Lead) (Fuse Lead) Cement 1.00.059 WF5N +.079 Thermal Fuse (25.51.5) .197 .512.039 .354.039 -.039 Resistor +2 (13.01.0) (9.01.0) 1.52.059 (5 ) -1 2A: 0.6 WF7N .031 (38.51.5) (0.8) 10A: 1.0 +.079 .295 -.039 .630.039 .472.039 1.38.059 WF10N +2 (16.01.0) (121.0) (351.5) (7.5 ) Lead Wire +2 -1 4.5 -1 d P ordering information WF 5N C 8 G 100 K EOL Terminal Surface Thermal Fuse Resistor Nominal Resistance Type Style Temperature Symbol Material Resistance Tolerance 5N C: SnCu See table below G:Glass core 2 significant figures J: 5% wire wound + 1 multiplier R 7N K: 10% indicates decimal S: Metal oxide 10N on values <10 film applications and ratings Power Rating Resistance Range/ Resistance Thermal Fuse Maximum Maximum Operating Thermal (W) Material ( ) Tolerance Working Overload Temperature Fuse G: Glass S: Metal G: Glass S: Metal Thermal Current Voltage Voltage Voltage Range Symbol Core Oxide Core Oxide 5N 7N 10N Cut-off Temp. Rating Rating** Wirewound Film Wirewound Film 8 1292 1.6 2.0 2.5 -20C~+89C +1 10 150 -3 1.6 2.0 2.5 -20C~+100C 10A +3 12 188 -1 2.0 2.4 3.5 -20C~+133C 110 - 10k E= 1 - 100 J: 5% 14 2272 2.0 2.4 3.5 -20C~+147C AC (E24) J: 5% P R 6.25 E= P R (E24) K: 10% 250V 32 1102 1.2 1.4 -20C~+75C +3 33 126 -2 1.4 1.6 -20C~+91C 2A 34 1293 1.6 2.0 -20C~+95C +3 35 146 -2 1.6 2.0 -20C~+105C * Other combinations of thermal cut-off temperatures and resistance values are available on request ** Rated Voltage of Resistors= Power Rating x Resistance Value. Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 12/20/17 KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com 227 H resistorsresistors WF NOT RECOMMENDED FOR NEW DESIGN thermal fuse built-in resistor environmental applications Derating Curve 100 100 Temp. Symbol Temp. Symbol 80 80 60 60 10 40 40 35 33 14 20 20 34 8 12 32 0 0 -25 25 75 89 100 133 147 -25 25 68 75 9195 105 -20 020 40 60 80 100 120 140 160 -20 020 40 60 80 100 120 140 160 Ambient Temperature Ambient Temperature (C) (C) Temperature Rise T For resistors operated at an ambient temperature of 25C or above, a 200 power rating shall be derated in accordance with the above rating curves. 5N 150 7N 100 10N 50 Measuring Point 0 2 4 6 8 Load Power (W) EOL Performance Characteristics Requirement R (%+0.05) Parameter Limit Typical Test Method Within specified Resistance 25C tolerance -6 250 x 10 /K (G) T.C.R. +25C/-55C and +25C/+125C* -6 300 x 10 /K (S) Overload (Short Time) 2% 0.5% Rated voltage x 6.25 for 5 seconds Resistance to Soldering Heat 1% 0.3% 350C 10C, 3.5 seconds Moisture Resistance 5% 2% 40C, 90% - 95% RH, 500 hours, No load Load Life 5% 2% Rated voltage, 25C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle * The upper limit of Operating Temperature Range or 125C, whichever is lower Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 12/20/17 228 KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com PTemperature Rise (deg) Percent Rated Power (%) Percent Rated Power (%)