Pulse Withstanding Fusible Flameproof Metal Film Resistors EMC Series * * * * * * Two parallel resistance elements in a single chip Excellent pulse withstand performance Laser trimmed up to 0.5% tolerance Enhanced working voltage Enhanced power rating Pb-free terminations Electrical Data EMC2 Power rating at 70C Watts 2 4R7 - 68R Resistance range Ohms TCR (25 to 75C) ppm/C 100 Isolation Voltage Volts 500 Resistance Tolerance % 10, 20 Standard Values E12 Thermal Impedance C/Watt Ambient temperature range 82 C -55 to +155 Physical Data D Dimensions (mm) & Weight (g) Type L max D max f min d nom PCB mount centres Min bend radius Wt. nom EMC2 10 4 27 0.8 18.4 1.2 0.55 d L f Construction The metal film is deposited onto a high purity ceramic rod. End caps are force fitted 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 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.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 08.12 Pulse 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% Shelf life: 12 months at room temperature R% 5 2 Derating from rated power at 70C Zero at 155C R% Climatic 3 Climatic Category 50/155/56 Temperature rapid change R% 0.5 Resistance to solder heat R% 0.5 Pulse Performance 700 700 700 600 600 600 500 500 500 400 400 400 300 300 300 200 200 200 100 100 100 000 10 20 20 30 40 50 60 70 000 10 10 20 3030 4040 5050 6060 7070 Value(Ohms) (Ohms) Value Value (Ohms) Single Rectangular Pulse Single Rectangular Pulse Single Rectangular Pulse 10000 10000 10000 Pk Power (W) Pk PkPower Power(W) (W) Pk Pk Voltage Voltage (V) (V) Pk Voltage (V) IEC61000-4-5 IEC61000-4-5 1.2/50 Pulse IEC61000-4-51.2/50 1.2/50s sPulse 1000 1000 1000 100 100 100 10 1010 1 11 0.01 0.1 0.01 0.01 0.10.1 EMC resistors fuse open circuit at overload powers exceeding 60W within the time indicated on the Fusing Characteristic. Their fusing performance at lower overload powers is not specified. Fusing Characteristic (Constant Voltage) Max. Fusing Time (s) After fusing, the resistance is at least 100 times greater than the original nominal value. 100 1000 10000 101010 100 100 1000 1000 10000 10000 Pulse Duration (ms) Pulse PulseDuration Duration(ms) (ms) Fusing Performance EMC resistors fuse safely in the event of a 115Vrms / 240Vrms overload (line / mains short circuit condition) without burning or emitting incandescent particles. 1 11 20 15 10 5 0 (4R7-8R2) (10R-68R) 40 50 60 70 80 90 100 Initial Power (W) General Note 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.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 08.12 Pulse Withstanding Fusible Flameproof Metal Film Resistors EMC Series Application Notes 1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. 2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An estimate of the temperature rise to be expected can be calculated using the thermal impedance figures given under Electrical Data. 3. To protect against fire under all conditions of overload, a positive clearance of at least 13mm should be provided between the body of the resistor and any combustible materials. 4. EMC resistors can also be supplied loose packed with radial, goalpost or lancet pre-formed leads, tape packed with radial preformed leads, or in blister tape with Z-formed leads for SMD mounting. Consult factory for details. Packaging Our standard packaging for EMC is taped and boxed. The critical dimensions are shown in Figure 1. The component wires will not protrude beyond the outside edge of the tapes. Alternative packaging is available by request. mm EMC2 B 62 C 5 Figure 1 c 6 f1 f2 b f 2 Body location f1-f2 < 1.4mm 6 Standard Quantities Per Package Type EMC2 Ammo Pack 2000 Ordering Procedure Specify type reference, value and tolerance as shown in this example of EMC2 at 33, 20%: EMC2 - 33R M I Type Value (use IEC62 code) Tolerance (use IEC62 code) K 10% M 20% Packing I Ammo EMC2 2000/box Standard General Note 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.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) TT electronics plc 08.12