High Voltage Thick Film
Resistor
F Series
• Termination variants
• Wide resistance range
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• Good resistance stability
• Working voltage up to 28KV
• Sets available with matched characteristics
• Good ratio matching over wide voltage range
• Series connection of resistors by screw terminals
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Electrical Data
Limiting
Element
Voltage
(volts)
TCR
(±ppm/°C)
Resistance
Tolerance (%)
Power
Rating @
20°C
Values
Resistance
Range
(ohms)
Thermal
Impedance Temperature
(°C/watt)
Operating
IRC
Type
(any value to
special order)
(values>1G:
(measured at 100
volts dc)
Range (°C)
(watts)
TCR is 250ppm/°C)
In Air In Oil
F43
F44
0.7
1.3
2M to 100G
4K
8K
-2000
-2000
2, 5, 10
2, 5, 10
44
33
-55 to 100
-55 to 100
EIA 2%
values
preferred
2M to 150G 14K
28K
CONSTRUCTION:
The Cermatox® sintered oxide based resistive thick film is fired
Screw Terminations: Styles D and KU. See illustration.
onto the surface of a high quality ceramic onto which turned Material: Turned brass.
brass end caps are pressed. A helical cut is made into the film
to adjust its ohmic value and finally a sleeve is fitted to provide Screw Thread: All caps are tapped UNF-10 x 4.2 deep. UNF-
mechanical protection and electrical insulation. Resistors for use 10 is 32 TPI, 60° thread angle 4.72±0.07 mm outside diameter,
in oil or SF6 can be supplied with a lacquer protection instead 3.83 mm core diameter.
of the sleeve.
Coupling Stud: All KU & TU resistors are supplied with 8 mm
TERMINATIONS:
long screwed brass studs.
Three styles of termination are available to permit resistors to
be screwed together in a series chain, with the end members MARKING:
having axial wires for soldering.
Type reference, resistance value, tolerance and data code are
legend marked.
Wire Terminations: Styles D and KU. See illustration.
Material: Solder-coated copper wire.
SOLVENT RESISTANCE:
The lacquer and protective sleeve provide excellent resistance
to all normal industrial cleaning solvents suitable for printed
circuits.
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
F Series Issue October 2008 Sheet 1 of 3