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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 - 70C 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
(c) 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(R) 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 20C Shelf life: 12 months at room temperature Derating from rated power at 20C Noise (V/V in a decade of frequency) Voltage coefficient of resistance ppm/V R% R% Zero at 100C <2.5 <25 5 Typical 1 0.5
Application Notes
Mounting
Due to the high voltage which can appear between the end cap and any adjacent metal part, resistors should be mounted at an adequate distance from other conductors. Resistors may be screwed together to provide an assembly which will be capable of withstanding any desired voltage, providing no individual resistor is subjected to a greater stress or power dissipation than is recommended in this data sheet. For some high voltage applications it is required to immerse the components in oil or gas to reduce the effects of corona and surface tracking. A special lacquer is available, suitable for immersion in transformer oil of SF6. When resistors are required to be potted, the preferred encapsulant is a silicone compound. 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 to 1 ohm.
(c) 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 202
Matched Sets
Matched sets can be supplied for use as voltage dividers. These may be screwed together to form sticks and, by selecting the KU type of termination, a wire connection can be provided at each end of the stick. Enquiries are welcomed for special resistors and sets when resistor length, operating voltage or resistance vale is outside the catalogued range.
Packaging
All components are supplied in boxes.
Standard Quantities Per Box
All Types 10 or 20 per box
Issue B * 03.02

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