T43D

High Voltage Precision Thick Film Resistors T Series Welwyn Components • Working voltage up to 100kV • Resistances up to 50G • TCR down to 25ppm • Termination variants • Sets of resistors with matched characteristics Electrical Data T43 Power rating at 20°C Resistance range Limiting element voltage TCR Resistance tolerance Values Thermal impedance Ambient temperature range °C/watt °C 31 watts ohms volts ppm/°C % 1.5 1K to 10G 4K 8K T44 3.5 1K to 50G 14K 28K 25, 50, 100 1, 2, 5 E24 preferred values 27 -55 to 150 13 T48 10 1K to 50G 50K 100K In air In oil Values > 1G: TCR is 250ppm/°C Closer tolerances over restricted range Any value to special order Notes Physical Data Dimensions (mm) & Weight (g) PCB mounting centres 31.8 57.2 156.4 Min Bend Radius 1.2 1.2 1.2 Wt. nom 3.1 5.6 18.5 3.9 7.4 19.3 5.8 8.2 20.2 T44TU L T44KU L T44D d D L f Type T43D T44D T48D T43KU T44KU T48KU T43TU T44TU T48TU L max 25.4 50.8 150.0 30.2 53.2 152.2 32.6 55.6 154.8 D max 8.4 8.4 8.4 8.5 8.5 8.5 8.5 8.5 8.5 f min 32.0 32.0 32.0 32.0 32.0 32.0 d nom 0.8 0.8 0.8 0.8 0.8 0.8 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 193 High Voltage Precision Thick Film Resistors T Series Construction A ruthenium oxide based resistive film is fired onto the surface of a high quality former. Turned brass end caps are fitted. A Helical cut is made into the film to adjust its resistive value and finally a protective sleeve is fitted to provide mechanical protection and electrical insulation. Resistors for use in oil or SF6, can be supplied with a lacquer protection instead of the sleeve. Solderability: Welwyn Components The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. 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°C 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. 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 terminations available upon request. Material: Strength: Solder coated copper wire. The terminations meet the requirements of IEC 68.2.21 Coupling Stud: Marking Type reference, resistance value, tolerance and date code are legend marked. The resistance value conforms to IEC 62. Solvent Resistance The lacquer and the 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 (in a decade of frequency) Voltage coefficient of resistance µV/V ppm/V ∆R% ∆R% ≤ IG:3, >IG:5 0.3 Zero at 150°C