Low Value Resistors Welwyn Components Metal Film Resistors Low Value Make Possible Welwyn Components Metal Film Resistors Low Value Metal 2500 Series Film RResistanceesist valuesors down to 0.025 ohms s 2500 Series Low inductance s 2500 SeriesResistance values down to 0.025 ohms s Tolerances down to 1% s Low inductance s Flameproof protection s Resistance values down to 0.025 ohms Tolerances down to 1% s Low inductance Flameproof protection Tolerances down to 1% s Flameproof protection All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2) Electrical Data 2504 Notes Electrical Data Power rating at 25C watts 2.0 Power rating at 70C watts 1.5 2504 Notes Resistance range ohms 0R025 to 1 Power rating at 25C watts 2.0 Isolation voltage volts 700 Power rating at 70C watts 1.5 TCR (+20 to 70C) ppm/C 0 to +380 Resistance range ohms 0R025 to 1 Resistance tolerance % 1, 2, 5, 10 Measured at 6mm from caps Isolation voltage volts 700 Thermal impedance C/watt 65 TCR (+20 to 70C) ppm/C 0 to +380 Values E24 Resistance tolerance % 1, 2, 5, 10 Measured at 6mm from caps Operating temperature range C -55 to +150 Thermal impedance C/watt 65 Values E24 Operating temperature range C -55 to +150 Physical Data Dimensions (mm) & weight (g) Physical Data PCB Min. mounting bend Wt. d Dimensions (mm) & weight (g) D Type L Max D Max f min d nom centres radius nom L f PCB Min. 2504 14.5 5.3 23.8 0.8 20.3 1.2 1.1 mounting bend Wt. d D Type L Max D Max f min d nom centres radius nom L f Construction Marking 2504 14.5 5.3 23.8 0.8 20.3 1.2 1.1 The metal film is deposited on a high purity ceramic rod. End Values below R10 are colour coded with 3 bands. Values R10 caps are force fitted and termination wires welded to the and above are marked with 4 bands. IEC 62 colours are used. Construction Marking caps. The resistive film is then adjusted to the required value The metal film is deposited on a high purity ceramic rod. End Values below R10 are colour coded with 3 bands. Values R10 finally the cement protection is applied to the resistor body Solvent Resistance caps are force fitted and termination wires welded to the and above are marked with 4 bands. IEC 62 colours are used. and marked with indelible ink. The body protection and marking are resistant to all normal caps. The resistive film is then adjusted to the required value industrial cleaning fluids suitable for printed circuits. finally the cement protection is applied to the resistor body Solvent Resistance Terminations and marked with indelible ink. The body protection and marking are resistant to all normal Material Solder-coated copper wire. Flammability industrial cleaning fluids suitable for printed circuits. Strength The terminations meet the requirements of The resistors will not burn or emit incandescent particles Terminations IEC 68.2.21 under any condition of applied temperature or power Material Solder-coated copper wire. Flammability Solderability The terminations meet the requirements of overload. Strength The terminations meet the requirements of The resistors will not burn or emit incandescent particles IEC 115-1, Clause 4.17.3.2 IEC 68.2.21 under any condition of applied temperature or power Solderability The terminations meet the requirements of overload. IEC 115-1, Clause 4.17.3.2 General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK GenerGeneralal Not Notee Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 09.10 Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronicsresistors.comTT electronics plc 155 Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 09.10 07.14 155Low Value Metal Film Resistors Welwyn Components Low Value Metal Film Resistors Make Possible 2500 Series Performance MAXIMUM (+0.001) Load at rated power (1000 hours 25C) R% 3 Load at rated power (1000 hours 70C) R% 2 Derating from rated power at 70C Linear to zero at 150C Short term overload (6.25 x Pr for 5s) R% 0.5 Climatic R% 2 Climatic category 55 / 150 / 56 Resistance to solder heat R% 0.5 Vibration and bump R% 0.5 Inductance (measured at 6mm from caps) nH 20 Packaging The standard packaging for 2504 is taped. The critical dimensions are shown in Figure 1. The component wires will not protrude beyond the outside edge of the tapes. Taped product is then packed into ammo boxes. Alternative packaging is available by request. Pre-formed resistors are available and are supplied loose packed in plastic bags or boxes. Dimensions (mm) Type C b 2504 67 10 Ordering Procedure Example: 2504 at 0.33 ohms and 5% tolerance in an ammo pack box of 1000 pieces - 2 5 0 4 R 3 3 J I Type Value (use IEC62 code) Tolerance (use IEC62 code) F 1% J 5% G 2% K 10% Packing I Ammo 2504 1000/box Standard GenerGeneralal Not Notee Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics reserves the right to make changes in product specification without notice or liability. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 09.10 07.14