F43KU

High Voltage Thick Film Resistors F Series Welwyn Components • • • • • Working voltage up to 28kV Resistance up to 150G Termination variants Sets supplied with matched characteristics Good ratio matching over wide voltage range Electrical Data F43 Power rating Resistance range Limiting element voltage TCR 20° - 70°C Resistance tolerance Standard values Thermal impedance Ambient temperature range °C/watt °C 44 -55 to 100 watts ohms volts volts ppm/°C % 0.7 2M to 100G 4K 8K -2000 2, 5, 10 E24 preferred 33 Measured at 100 volts dc Any value to special order F44 1.3 2M to 150G 14K 28K In air In oil Notes Physical Data Dimensions (mm) & Weight (g) PCB Min. mounting Bend centres Radius Wt. nom 31.8 57.2 1.2 1.2 3.1 5.6 3.9 7.4 5.8 8.2 L L F44TU F44KU Type F43D F44D F43KU F44KU F43TU F44TU L max 25.4 50.8 30.2 53.2 32.6 55.6 D max 8.4 8.4 8.5 8.5 8.5 8.5 f min 32.0 32.0 32.0 32.0 d nom 0.8 0.8 0.8 0.8 F44D d D L f 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 © 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 201 High Voltage Thick Film Resistors F Series Construction The Cermetox® thick film is fired on to the surface of a high quality ceramic former. Turned brass end caps are fitted. A helical cut is made into the film to adjust its ohmic value and finally a sleeve is fitted to provide mechanical protection and electrical insulation. Resistors for use in oil SF6 can be supplied with a lacquer protection instead of the sleeve. Welwyn Components Screw Terminations: Styles TU and KU Material: Screw Thread: Turned brass All caps are tapped UNF - 10 x 4.2 deep. UNF - 10 is 32 TPI, 60° thread angle 4.72 ±0.07 mm outside diameter, 3.83 mm core diameter. All KU & TU resistors are supplied with 8 mm long screwed brass studs. Coupling Stud: Terminations Three styles of termination are available to permit resistors to be screwed together in a series chain, with the end members having axial wires for soldering. Wire Terminations: Styles D and KU Non standard wire terminations available upon request. Material: Strength: Solderability: Solder coated copper wire The terminations meet the requirements of IEC 68.2.21. The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. Marking Type reference, resistance value, tolerance and date code are legend marked. The resistance values conform to IEC 62. Solvent Resistance The lacquer and protective sleeve provide excellent resistance to all normal industrial cleaning solvents suitable for printed circuits. Performance Data Maximum Load at rated power: 1000 hours at 20°C Shelf life: 12 months at room temperature Derating from rated power at 20°C Noise (µV/V in a decade of frequency) Voltage coefficient of resistance ppm/V ∆R% ∆R% Zero at 100°C