2500 WELWYN | Alldatasheet
Document overview
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Technical content
2500 Series
- Resistance values down to 0.025 ohms
- Low inductance
- Tolerances down to 1%
- Flameproof protection
2504 Notes
Power rating at 25°C watts 2.0 Power rating at 70°C watts 1.5 Resistance range ohms 0R025 to 1 Isolation voltage volts 700 TCR (+20° to 70°C) ppm/°C See Figure 1 Resistance tolerance % 1, 2, 5, 10 Measured at 6mm from caps Thermal impedance °C/watt 65 Values E24 Operating temperature range °C -55 to +150 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. © 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 Electrical Data Issue B · 03.02 A subsidiary of TT electronics plc Welwyn Components 155 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. 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 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. Flammability The resistors will not burn or emit incandescent particles under any condition of applied temperature or power overload. Dimensions (mm) & weight (g) PCB Min. mounting bend Wt. Type L Max D Max f min d nom centres radius nom Physical Data LD f d