RHeisgishtoVrsoltage Precision
HTihgihckVoFltilamgeRPeresciisstioonrs Welwyn Components
Thick Film Resistors
T Series
TsSWerieosrking voltage up to 100kV
s RWeosriksitnagnvcoelstaugeputpot5o01G00kV
s TRCesRisdtaonwcens utop t2o55p0pGm
s TTeCrRmdionwantitoon2v5apprimants
s STeertms ionfatrieonsisvatorirasntws ith matched characteristics
Sets of resistors with matched characteristics
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
T43 T44 T48 Notes
Power rating at 20°C 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
T43D 25.4 8.4 32.0 0.8 31.8 1.2 3.1 T44D
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
T44KU 53.2 8.5 32.0 0.8 7.4 T44TU T44KU
T48KU 152.2 8.5 32.0 0.8 19.3 L L
T43TU 32.6 8.5 5.8
T44TU 55.6 8.5 8.2
T48TU 154.8 8.5 20.2
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http://www.ttelectrToTnieclse.ccotrmon/riecssisptolcrs
©©TeleTWpTheoElnlweec:yt+rn4o4nCi(c0os)mp16lpc7o0n8e22n1t8s1L·iFmacistiemdile·: Bedlington, Northumberland NE22 7AA, UK
+44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 07.11
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TThihckicFkilmFiRlmesisRtoerssistors
TTSeSreierises Welwyn Components
Construction Solderability: The terminations meet the requirements
A ruthenium oxide based resistive film is fired onto the of IEC 115-1, Clause 4.17.3.2.
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
value and finally a protective sleeve is fitted to provide Material: Turned brass.
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, 60°C thread angle,
instead of the sleeve. 4.72±0.07 mm outside diameter, 3.83
Terminations mm core diameter.
Three styles of termination are available to permit resistors to Coupling Stud: All KU & TU resistors are supplied with 8
be screwed together in a series chain, with the end members mm long screwed brass studs.
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.
Material: Solder coated copper wire. Solvent Resistance
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 20°C ∆R% ≤ IG:3, >IG:5 0.3
Shelf life: 12 months at room temperature ∆R% 0.3 0.1
Derating from rated power at 20°C Zero at 150°C
Noise (in a decade of frequency) µV/V <2.5
Voltage coefficient of resistance ppm/V <1
Matched Sets When resistors are required to be potted, the preferred
Matched sets can be supplied for use as precision voltage encapsulant is a silicone compound.
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 1kΩ, 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
Application Notes and surface tracking. A special lacquer protected version of
Due to the high voltage which can appear between the end the resistor is available, suitable for immersion in transformer
cap and any adjacent metal part, resistors should be mounted oil or SF6.
at an adequate distance from other conductors. Packaging
An appropriate number of resistors may be screwed together Resistors are supplied packed in boxes.
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
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© TT Electronics plc
07.14
HHigihgVholVtaogletaPgreecisPiornecision
TThhicikcFkilmFiRlmesisRtoerss istors
TTSSereierises Welwyn Components
Ordering Procedure
Example: T44 wire-ended and sleeved at 4.7 gigohms and 5% tolerance -
T 44D– 4G7 J I
Type
Termination
D Wire / wire
KU Wire / screw
TU Screw / screw
Protection
Lacquered & Sleeved
H Lacquered only (for use in oil or SF6)
Value (use IEC62 code)
Tolerance (use IEC62 code)
F 1%
G 2%
J 5%
Packing
I Box 10 or 20/box Standard
Note: Standard TCR is 100ppm/°C. Contact factory for 50 and 25ppm/°C grades.
General Note BI Technologies IRC Welwyn
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. http://www.ttelectronics.com/resistors
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
©TeTleTphEolenec:tr+o4n4ic(s0)p1lc670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 07.11
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