EMC2-27RKI TT Electronics

Resistors Pulse Withstanding Fusible Flameproof Metal Film Resistors EMC Series UL1412 recognised* Failsafe 240V mains fusing Good pulse handling capability Small size for power rating UL94-V0 flameproof protection Surface mount ZI-form option * Values 22R and above. UL file number E234469 AllAll partsparts araree Pb-Pb-frfreeee andand ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amendedamended bbyy (EU)(EU) 2015/8632015/863 (R(RoHS3)oHS3) Electrical Data EMC2 Power rating at 70C Watts 2 Resistance range Ohms 4R7 68R TCR (25 to 75C) ppm/C 100 Isolation Voltage Volts 500 Resistance Tolerance % 10, 20 Standard Values E12 Thermal Impedance C/Watt 82 Ambient temperature range C -55 to +155 Physical Data D Dimensions (mm) & Weight (g) PCB Min bend Type L max D max f min d nom mount Wt. nom radius centres f L EMC2 10 4 27 0.8 15 1.2 0.55 d Construction The metal film is deposited onto a high purity ceramic rod. End caps are force edfitt and termination wires are welded to the end caps. Finally, a cement protection is applied to the resistor body prior to marking with indelible ink. The cement protection is applied in a manner that leaves the terminations completely clear. This permits a well-defined body length (clean lead to clean lead dimension L). Terminations Material: Solder-coated copper wire Strength: The terminations meet the requirements of IEC 68.2.21 Solderability: The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2 Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronics.com/resistors TT Electronics plc 11.20Pulse Withstanding Fusible Flameproof Metal Film Resistors EMC Series Flammability The resistor coating is UL94-V0 rated and will not burn or emit incandescent particles under any condition of applied temperature or power overload. Marking EMC resistors are colour coded with five bands. Four of the bands indicate value and tolerance in accordance with IEC62. Parts with 20% tolerance have no fourth band. A fifth yellow band denotes constant voltage fusibility. Performance Data Maximum Load at Rated Power: 1000hrs 70C R% 5 Shelf life: 12 months at room temperature R% 2 Derating from rated power at 70C Zero at 155C Climatic R% 3 Climatic Categor y 50/155/56 Temperature rapid change R% 0.5 Resistance to solder heat R% 0.5 Pulse Performance Single Rectangular Pulse IEC61000-4-5 1.2/50 s Pulse Single Rectangular Pulse IEC61000-4-5 1.2/50 s Pulse Single Rectangular Pulse IEC61000-4-5 1.2/50 s Pulse 1000010000 10000 700700 700 10001000 600600 600 1000 500500 500 400 400 400 100 100 100 300 300 300 200 200 200 100 10 100 10 100 10 0 0 0 010203040506070 010203040506070 1 010203040506070 1 1 0.01 0.11 10 100 1000 10000 Value(Ohms) 0.01 0.11 10 100 1000 10000 Value(Ohms) 0.01 0.11 10 100 1000 10000 Value(Ohms) Pulse Duration (ms) Pulse Duration (ms) Fusing Performance Pulse Duration (ms) EMC resistors fuse open circuit at overload powers Fusing Characteristic exceeding 60W within the time indicated on the Fusing Characteristic. Their fusing performance at lower overload (Constant Voltage) powers is not specified. EMC resistors fuse safely in the event of a 115Vrms / 20 240Vrms overload (line / mains short circuit condition) (4R7-8R2) 15 without burning or emitting incandescent particles. 10 After fusing , the resistance is at least 100 times greater 5 (10R-68R) than the original nominal value. 0 40 50 60 70 80 90 100 Initial Power (W) General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronics.com/resistors TT Electronics plc 11.20 Pk Voltage(V) Pk Voltage(V) Pk Voltage(V) Pk Power(W) Pk Power(W) Pk Power(W) Max. Fusing Time (s)