High Voltage
Voltage
Film Resistors
Resistors
Thick Film
Welwyn Components
F Series
F Series
Working voltage
voltage up
up to
to 28kV
28kV
• Working
Resistance up to 150G
up to 150G
• Resistance
Termination variants
• Termination
Sets suppliedvariants
with matched characteristics
Goodsupplied
ratio matching
over wide
voltage range
with matched
characteristics
• Sets
·
·
·
·
·
•
Good ratio matching over wide voltage range
Electrical Data
F43
F44
Notes
Power rating
watts
0.7
1.3
Resistance range
ohms
2M to 100G
2M to 150G
volts
4K
14K
In air
volts
8K
28K
In oil
Limiting element voltage
TCR 20° - 70°C
ppm/°C
Resistance tolerance
-2000
%
2, 5, 10
Standard values
Measured at 100 volts dc
E24 preferred
Thermal impedance
°C/watt
Ambient temperature range
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
F44D
d
D
L
f
F44TU
F44KU
L
L
General Note
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.
A subsidiary of
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone:
+44 (0) 1670
©
TT electronics
plc822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue B · 03.02
08. 11
201
High
HighVoltage
Voltage
Thick
Resistors
ThickFilm
Film
Resistors
Welwyn Components
F Series
Series
FF
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
former.
Turned
brass
end
caps
are
fitted.
A
quality ceramic former. Turned brass end caps are fitted. A
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:
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.
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
rated power
at temperature
20°C
Shelf
life: from
12 months
at room
∆R%
∆R%
5
1
Typical
0.5
1
Zero at 100°C
∆R%
0.5
<2.5
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)
ppm/V
<25
<2.5
Voltage coefficient of resistance
ppm/V
<25
Application Notes
Mounting
Application
Notes
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
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
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
Issue B · 03.02
Telephone:
+44
(0) 1670
Facsimile:
+44in(0)product
1670 829465
· Email:
info@welwyn-tt.com
· Website: www.welwyn-tt.com
TT
electronics
reserves
the822181
right to·make
changes
specification
without
notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
202
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Issue B · 03.02
Telephone:
+44 (0) 1670
© TT electronics
plc822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
202
08. 11
High
HighVoltage
Voltage
Thick
Resistors
ThickFilm
Film
Resistors
Welwyn Components
F Series
F Series
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
©
TT electronics
plc 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone:
+44 (0) 1670
202
Issue B · 03.02
08. 11
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
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F44TU-H250MJI