Resistors High Voltage Precision High Voltage Precision Welwyn Components Thick Film Resistors Thick Film Resistors T Series T Series s Working voltage up to 100kV Resistances up to 50G s Working voltage up to 100kV TCR down to 25ppm s Resistances up to 50G TCR down to 25ppm Termination variants s Termination variants Sets of resistors with matched characteristics s Sets of resistors with matched characteristics AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3) Electrical Data T43 T44 T48 Notes Power rating at 20C watts 1.5 3.5 10 Resistance range ohms 10K to 10G 10K to 50G 33K to 50G Limiting element voltage volts 4K 14K 50K In air 8K 28K 100K In oil TCR ppm/C 100 * Values > 1G: TCR is 250ppm/C Resistance tolerance % 1, 2, 5 Closer tolerances over restricted range Values E24 preferred values Any value to special order Thermal impedance C/watt 31 27 13 Ambient temperature range C -55 to 150 * Contact factory for 25 or 50ppm/C Physical Data Dimensions (mm) & Weight (g) PCB Min mounting Bend Type L max D max f min d nom centres Radius Wt. nom T44D T43D 25.4 8.4 32.0 0.8 31.8 1.2 3.1 d D T44D 50.8 8.4 32.0 0.8 57.2 1.2 5.6 L f T48D 150.0 8.4 32.0 0.8 156.4 1.2 18.5 T43KU 30.2 8.5 32.0 0.8 3.9 T44TU T44KU T44KU 53.2 8.5 32.0 0.8 7.4 L L T48KU 152.2 8.5 32.0 0.8 19.3 T43TU 32.6 8.5 5.8 T44TU 55.6 8.5 8.2 T48TU 154.8 8.5 20.2 General Note General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronics.com/resistors TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 07.11 06.18High Voltage Precision High Voltage Precision Thick Film Resistors Thick Film Resistors T Series Welwyn Components T Series Solderability: The terminations meet the requirements Construction of IEC 115-1, Clause 4.17.3.2. A ruthenium oxide based resistive film is fired onto the surface of a high quality former. Turned brass end caps are Screw Terminations: Styles TU and KU. fitted. A Helical cut is made into the film to adjust its resistive Material: Turned brass. value and finally a protective sleeve is fitted to provide mechanical protection and electrical insulation. Resistors for Screw Thread: All caps are tapped UNF 10 x 4.2 deep. use in oil or SF6, can be supplied with a lacquer protection UNF 10 is 32 TPI, 60C thread angle, instead of the sleeve. 4.720.07 mm outside diameter, 3.83 mm core diameter. Terminations Coupling Stud: All KU & TU resistors are supplied with 8 Three styles of termination are available to permit resistors to mm long screwed brass studs. be screwed together in a series chain, with the end members having axial wires for soldering. Marking Wire Terminations: Styles D and KU. Type reference, resistance value, tolerance and date code are Non standard terminations available upon legend marked. The resistance value conforms to IEC 62. request. Solvent Resistance Material: Solder coated copper wire. The lacquer and the protective sleeve provide excellent Strength: The terminations meet the requirements resistance to all normal industrial cleaning solvents suitable for of IEC 68.2.21 printed circuits. Performance Data Maximum Typical Load at rated power: 1000 hours at 20C R% IG:3, >IG:5 0.3 Shelf life: 12 months at room temperature R% 0.3 0.1 Derating from rated power at 20C Zero at 150C Noise (in a decade of frequency) V/V <2.5 Voltage coefficient of resistance ppm/V <1 When resistors are required to be potted, the preferred Matched Sets encapsulant is a silicone compound. Matched sets can be supplied for use as precision voltage dividers. These may be screwed together to form sticks and, For voltage dividers with a low resistance section below the by selecting the KU type of termination, a wire connection minimum available value of 1k, it is normal practice to use a can be provided at each end of the stick. Welwyn resistor, RC Series, obtainable down to 1 ohm. Enquiries are welcomed for special resistors and sets when Oil Immersion resistor length, operating voltage or resistance value are For some high voltage applications it is required to immerse outside the catalogued range. the components in oil or gas to reduce the effects of corona and surface tracking. A special lacquer protected version of Application Notes the resistor is available, suitable for immersion in transformer Due to the high voltage which can appear between the end oil or SF6. cap and any adjacent metal part, resistors should be mounted at an adequate distance from other conductors. Packaging Resistors are supplied packed in boxes. An appropriate number of resistors may be screwed together as a stick to provide an assembly which will be capable to withstanding any desired voltage, providing no individual Standard Quantities Per Box resistor is subject to a greater stress or power dissipation than All Types 10 or 20 per box is recommended in this data sheet, and that appropriate anti- corona devices are fitted. The axial termination should not be bent closer than twice the diameter of the terminal wire from the body of the resistor. General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. 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 All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronics.com/resistors 07.11 TT Electronics plc 06.18