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| Low Value Metal Film Resistors 2500 Series Welwyn Components * * * * Resistance values down to 0.025 ohms Low inductance Tolerances down to 1% Flameproof protection Electrical Data 2504 Power rating at 25C Power rating at 70C Resistance range Isolation voltage TCR (+20 to 70C) Resistance tolerance Thermal impedance Values Operating temperature range C watts watts ohms volts ppm/C % C/watt 2.0 1.5 0R025 to 1 700 See Figure 1 1, 2, 5, 10 65 E24 -55 to +150 Measured at 6mm from caps Notes Physical Data Dimensions (mm) & weight (g) PCB mounting centres 20.3 Min. bend radius 1.2 Wt. nom 1.1 Type 2504 L Max 14.5 D Max 5.3 f min 23.8 d nom 0.8 d D L f Construction The metal film is deposited on a high purity ceramic rod. End caps are force fitted and termination wires welded to the caps. The resistive film is then adjusted to the required value; finally the cement protection is applied to the resistor body and marked with indelible ink. Marking Values below R10 are colour coded with 3 bands. Values R10 and above are marked with 4 bands. IEC 62 colours are used. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits. Terminations Material Strength Solder-coated copper wire. 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 Flammability The resistors will not burn or emit incandescent particles under any condition of applied temperature or power overload. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue B * 03.02 (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 155 |
Price & Availability of 2500
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