WRN TTELEC | Alldatasheet

Document overview

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Technical content

  • Conforms to MIL-R-10509
  • Resistance range: 1 ohm to 1M ohms
  • High reliability WRN55 CD Power rating watts 0.1 @ 125°C 0.125 @ 70°C Resistance range ohms 1R0 - 1M Limiting element voltage volts 350 TCR ppm/°C 50 100 Resistance tolerance % 1 Ambient temperature range °C -55 to 155 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 140 Construction The resistance element is a precisely controlled thin film of metal alloy sputtered on to a high purity ceramic core, protected by a moisture-resistant, high dielectric strength coating applied so that terminations remain 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 and MIL-R-10509. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 and MIL-R-10509. Marking Components are legend marked with style, charcatestc, resistance value and resistance tolerance. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents for printed circuits. Dimensions (mm) PCB Min. mounting bend Type L Max D Max f min d nom centres radius 63.50 ±1 Physical Data LD f d RN55D 1003F RN55 D 1003 F Style Characteristic Resistance Resistance value value

© 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 Issue B · 03.02 Welwyn Components 141 Tested in accordance with Mil-R-10509 Requirements Typical CD Thermal Shock ∆R% 0.25 0.5 0.2 Low temperature operation ∆R% 0.25 0.5 0.1 Terminal strength ∆R% 0.2 0.5 0.15 Short term overload ∆R% 0.25 0.5 0.2 Dielectric withstanding voltage ∆R% 0.25 0.5 0.2 Effect of solder heat ∆R% 0.25 0.5 0.1 Load life ∆R% 0.5 1 0.25 Shock ∆R% 0.25 0.5 0.1 Moisture resistance ∆R% 0.5 1.5 0.5 Vibration ∆R% 0.25 0.5 0.1 Tested to CECC 40101-019 Maximum Shelf life: 12 months at room temperature ∆R% 0.1 Long term damp heat ∆R% 0.5 Temperature rapid change ∆R% 0.25 Insulation resistance ohms >1G Performance Data 1) 52.00 ± 1 2) 63.50 ± 1 Figure 2 Type WRN55 Large ammo pack 5000 Standard Quantities Per Package

© 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 Issue B · 03.02 Welwyn Components 142 100 0.1 0.1 1 10 100 1000 10000 ti (s) Peak Power (W) Maximum peak pulse power as a function of puse duration (ti) WRN55 10000 1000 100 0.1 1 10 100 1000 10000 ti (s) Peak Power (V) Maximum peak pulse voltage as a function of puse duration (ti) WRN55 1000 100 0.1 1 10 100 1000 10000 ti (s) Peak Power (W) Maximum peak pulse power individual pulses WRN55 Graph 1 Graph 2 Graph 3 Figure 1 Voltage (V) ti tp Time (secs) Test Method for Graphs 1 and 2 The resistor is subject ot 10,000 pulses as shown in figure 1. Maximum resistance change due to test will not exceed 1%. Maximum pulse voltages are detailed in graph 2 above. For any combination of power and pulse length (ti) tp is determined by the need to ensure that the average power does not exceed the rated power. tp = Applied Pulse Power x ti Rated Power Test Method for Graph 3 The resistor is subject to 1000 impulses of rectangular shape applied at one minute intervals. The limit of acceptance was a shift in resistance of less than 1% from the initial value. The power applied was subject to the restrictions of the maximum permissible impulse voltage graph.