Resistors High Voltage ThickVoltage Film Resistors High Thick Film Resistors F Series Welwyn Components Working voltage up to 28kV F•Series up to 150G • Resistance Working voltage up to 28kV variants • Termination Resistance up to 150G Sets supplied with • Termination variants matched characteristics Sets supplied with matched characteristics ratio matching over wide voltage range • Good Good ratio matching over wide voltage range All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2) Electrical Data F43 F44 Power rating watts 0.7 1.3 Resistance range ohms 2M to 100G 2M to 150G Limiting element voltage TCR 20° - 70°C volts 4K 14K In air volts 8K 28K In oil ppm/°C Resistance tolerance -2000 % Standard values Thermal impedance Notes °C/watt Ambient temperature range 2, 5, 10 Measured at 100 volts dc E24 preferred Any value to special order 44 °C 33 -55 to 100 Physical Data Dimensions (mm) & Weight (g) PCB Min. mounting Bend centres Radius Wt. nom Type L max D max f min d nom F43D 25.4 8.4 32.0 0.8 31.8 1.2 3.1 F44D 50.8 8.4 32.0 0.8 57.2 1.2 5.6 F43KU 30.2 8.5 32.0 0.8 3.9 F44KU 53.2 8.5 32.0 0.8 7.4 F43TU 32.6 8.5 5.8 F44TU 55.6 8.5 8.2 GeneralNote Note General Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics 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. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. F44D d D L f F44TU F44KU L L BI Technologies IRC Welwyn © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) plc 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com © TT Electronics A subsidiary of TT electronics plc http://www.ttelectronics.com/resistors Issue B · 03.02 04.17 201 High HighVoltage Voltage Thick Resistors ThickFilm Film Resistors Welwyn Components FFF Series Series Series Construction Construction The Cermetox Cermetox thick thick film film is is fired fired on on to to the the surface surface of of aa high high The quality ceramic ceramic former. former. Turned Turned brass brass end end caps caps are are fitted. fitted. A A quality helical cut is made into the film to adjust its ohmic value and helical cut is made into the film to adjust its ohmic value and finally a sleeve is fitted to provide mechanical protection and finally a sleeve is fitted to provide mechanical protection and electrical insulation. insulation. Resistors Resistors for for use use in in oil oil SF6 SF6 can can be be electrical supplied with a lacquer protection instead of the sleeve. supplied with a lacquer protection instead of the sleeve. ® ® Terminations Terminations Screw Terminations: Terminations: Styles Styles TU TU and and KU KU Screw Material: Turned brass brass Material: Turned Screw Thread: All caps are tapped tapped UNF UNF -- 10 10 xx 4.2 4.2 Screw Thread: All caps are deep. UNF 10 is 32 TPI, 60° thread deep. UNF - 10 is 32 TPI, 60° thread angle 4.72 4.72 ±0.07 ±0.07 mm mm outside outside diameter, diameter, angle 3.83 mm core diameter. 3.83 mm core diameter. Coupling Stud: Coupling Stud: Three styles of termination are available to permit resistors to Three styles of termination are available to permit resistors to be screwed together in a series chain, with the end members be screwed together in a series chain, with the end members having axial wires for soldering. having axial wires for soldering. Marking Marking Wire Terminations: Styles D and KU Wire Terminations: Styles D and KU Non standard wire terminations Non standard terminations available uponwire request. available upon request. Material: Solder coated copper wire Material: Solder coated copper wire Strength: The terminations meet the requirements Strength: The terminations of IEC 68.2.21. meet the requirements of IEC 68.2.21. Solderability: The terminations meet the requirements Solvent Resistance Solvent Resistance The lacquer and protective sleeve provide excellent resistance Solderability: Type reference, resistance value, tolerance and date code are Type reference, resistance value, tolerance and date code are legend marked. The resistance values conform to IEC 62. legend marked. The resistance values conform to IEC 62. The protective sleevesolvents providesuitable excellent to alllacquer normaland industrial cleaning forresistance printed to all normal industrial cleaning solvents suitable for printed circuits. circuits. The terminations meet4.17.3.2. the requirements of IEC 115-1, Clause of IEC 115-1, Clause 4.17.3.2. Performance Data Performance Data Maximum Typical Load at rated power: 1000 hours at 20°C ∆R% 5 Maximum Shelf at life: 12 months at room temperature Load rated power: 1000 hours at 20°C Derating from rated power at 20°C Shelf life: 12 months at room temperature ∆R% ∆R% 5 1 Typical 0.5 1 0.5 <2.5 ppm/V <25 <2.5 Voltage coefficient of resistance ppm/V <25 Zero at 100°C Due to the high voltage which can appear between the end Mounting cap and any adjacent metal part, resistors should be mounted Due the high distance voltage which can appear between the end at antoadequate from other conductors. cap and any adjacent metal part, resistors should be mounted Resistors may bedistance screwedfrom together provide an assembly at an adequate other to conductors. which will be capable of withstanding any desired voltage, Resistors be screwed together to provide assembly providingmay no individual resistor is subjected to an a greater stress which will dissipation be capablethan of withstanding any desired voltage, or power is recommended in this data sheet. providing no individual resistor is subjected to a greater stress Forpower some dissipation high voltage applications it is required immerse or than is recommended in thistodata sheet. the components in oil or gas to reduce the effects of corona andsome surface tracking. special lacquer is available, suitable For high voltage A applications it is required to immerse for immersion in in transformer oilreduce of SF6.the effects of corona the components oil or gas to and surface tracking. A special lacquer is available, suitable When resistors are required to be potted, the preferred for immersion in transformer oil of SF6. encapsulant is a silicone compound. When resistors are required to be potted, the preferred For voltage dividers with a low resistance section below the encapsulant is a silicone minimum available valuecompound. of an F43 resistors, it is entirely suitable to use an RC Series resistor, available down to 1 ohm. For voltage dividers with a low resistance section below the minimum available value of an F43 resistors, it is entirely suitable to use an RC Series resistor, available down toNE22 1 ohm. © Welwyn Components Limited Bedlington, Northumberland 7AA, UK General Note 202 Zero at 100°C ∆R% Noise (µV/V in rated a decade of frequency) Derating from power at 20°C Voltage coefficient of resistance Noise (µV/V in a decade of frequency) Application Notes Mounting Application Notes 202 All KU & TU resistors are supplied with All KU & TU resistors are supplied with 8 mm long screwed brass studs. 8 mm long screwed brass studs. Matched Sets Matched sets can be supplied for use as voltage dividers. Matched Sets These may be screwed together to form sticks and, by Matched cantype be supplied for use aaswire voltage dividers.can selecting sets the KU of termination, connection These may be screwed together to form sticks and, by be provided at each end of the stick. selecting the KU type of termination, a wire connection can Enquiries areatwelcomed special resistors and sets when be provided each end for of the stick. resistor length, operating voltage or resistance vale is outside Enquiries are welcomed the catalogued range. for special resistors and sets when resistor length, operating voltage or resistance vale is outside Packaging the catalogued range. All components are supplied in boxes. Packaging Standard Quantities Per Box All components are supplied in boxes. All Types 10 or 20 per box All Types 10 or 20 per box Standard Quantities Per Box BI Technologies IRC Issue Welwyn B · 03.02 Telephone: +44 (0) 1670 822181 · Facsimile: (0) 1670 829465 · without Email: [email protected] · Website: www.welwyn-tt.com TT Electronics reserves the right to make changes+44 in product specification notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 © TT Electronics plc 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com http://www.ttelectronics.com/resistors Issue B · 03.02 04.17 High Voltage High Voltage Thick Film Resistors Thick Film Resistors F Series F Series Welwyn Components Ordering Procedure Example: F44 wire-ended and sleeved at 4.7 gigohms and 5% tolerance F44D–4G7JI Type Termination D KU TU Wire / wire Wire / screw Screw / screw Protection H Lacquered & Sleeved Lacquered only (for use in oil or SF6) Value (use IEC62 code) Tolerance (use IEC62 code) G J K 2% 5% 10% Packing I Box 10 or 20/box Standard General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. BI Technologies IRC Welwyn © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK © TT Electronics Telephone: +44 (0)plc 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com 202 http://www.ttelectronics.com/resistors Issue B · 03.02 04.17