Resistors
High Voltage
High Voltage
Thick Film Resistors
Thick Film Resistors
VRW Series
Welwyn Components
VRW Series
the requirements of BS / EN /
•
VRW37 meets
•
•
•
•
•
IEC 60065
VRW37 meets requirements of BS / EN / IEC 60065
High
working voltage to 10kV
10kV in compact
High
working voltage to
in compact size
size
High ohmic range to 68M
High ohmic range to 68M
High pulse load capability
High pulse load capability
Robust flameproof coating material
Robust flameproof coating material
Surface mount ZI-form option
RoHS compliant
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
VRW25
Power rating at 70 ° C
Resistance range
Limiting element voltage
Isolation voltage
TCR
Resistance Tolerance
Standard Values
Thermal Impedance
Ambient temperature range
° C/watt
°C
140
watts
(Ohms)
volts dc or ac peak
volts
ppm/ ° C
%
0.25
100K to 30M
1600
VRW37
0.5
100K to 30M
3500
700
200
1, 2, 5
E24 or E96
112
-55 to +155 ° C
70
VRW68
1.0
100K to 68M
10000
Physical Data
Type
L
Max
6.2
9.0
15.5
(Dimensions (mm) & Weight (g)
f
min
21
19.6
27
d
Nom
0.6±0.05
0.8±0.05
0.8±0.05
PCB
mount
centres
10.2
12.5
20.3
Min
bend
radius
0.6
1.2
1.2
Wt.
nom
0.3
0.5
1.15
d
D
Max
2.5
3.7
5.0
VRW25
VRW37
VRW68
D
L
f
Construction
Resistive thick film material is applied to high-grade ceramic
rods. Tin-plated steel caps are force fitted and the
termination wires are welded to the caps. The value is
obtained by a helical cut in the film and finally the resistor
body is protected by a cement coating.
Terminations
Material:
Strength:
Solderability:
Hot tin dipped 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
1% tolerance resistors are colour coded with 5 bands. 2%
and 5% tolerance have 4 bands. IEC62 colours are used.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn under any condition of
applied temperature or power overload.
General Note
General Note
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
Welwyn Components reserves the right to make changes in product specification
or liability.
All information is
is subject to Welwyn’s own data and is considered
accurate at time of going to
to print.
All information
subject to TT Electronics’ own data and is considered
accurate at time of going
print.
BI Technologies IRC Welwyn
A subsidiary of
www.ttelectronics.com/resistors
TT electronics plc
Issue C ·
05.08
07.06
11.20
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
VRW Series
VRW Series
SQP
VRW Series
SQP
Thick
VRW Series
High Voltage
High Voltage
Thick Voltage
Film Resistors
High Voltage
High Voltage Thick Film Resistors
High
Thick Film Resistors
SQP
VRW Series
Thick Film Resistors
High
Thick Film Resistors
SQP Series
Voltage
Performance Data
SQP
VRW Series
Performance Data
Performance Data
Performance Data
Film Resistors
Maximum
R%
Maxi
.5*
m
1
mu
Ma
1.
i
5*
um
xm
Maximum
125*
.
1
1 5*
M
.
aximum
1
125
.
1.5*
2
1.1
5
1
2
15
1..5
1
1.5
2
15
0..5
1.5
1.5
0.5
1.5
05
0..5
0.5
05
0..5
0.5
0.5
0.5
0.5
0.5
0.5
Welwyn Components
Welwyn Components
Welwyn Components
Welwyn Components
Welwyn Components
Typical
Ty
0.
i
4
al
pc
Typ
4
cal
0.
i
zero at 155˚ C
Typical
zero at 155˚ C
0014
. .5
0.4
Typical
zero at 155˚ C
0011
.. 5
0.4
zero at 155˚ C
0.15
0.1
2
zero at 155˚ C
0.15
0.1
0.
.15
55/155/56
0
2
0.1
55/155/56
000
.
5
. .2
0
0
2
.
1
55/155/56
0.
0.2
05
55/155/56
005
0..05
55/155/56
0.05
005
0..
.05
0
05
700 min
0.05
0.
.05
0
0 above 24M
70* 2% for ohmic values5
0 min
0.05
7002%n ohmic values above 24M
0.05
* mi for
700 min
70
2%
i
for ohmic values above 24M
*
0 mn
* 2% for ohmic values above 24M
* 2% for ohmic values above 24M
Load at rated voltage (1000hrs at 70˚C)
Pulse
Performance
Performace
Pulse
lta
Performace
Vo ge Proof
Pulse
Pulse Performance
Pulse Performace
Performace
Pulse Performance
Performance
Pulse Performace
Pulse
Pulse Performance
1
00
1
00
Loadtatg fromvoltage (1000hrs7at˚ C
R%
Dera in rated rated power at 0 70˚C)
Load at r(10 rat d 6.25
R%
Derating ratedxx5seat p6.25xxPr not Cexceeding 2 x LEV) 10kV in air) R%
t at
Overload f(10 voltageower aPr7not 70˚C)
Overload om 5s at (1000hrs 0˚ exceeding 2 x LEV or
Load at rated voltage (1000hrs at 70˚C)
R%
Derat heat steady d 6.25 days, exceeding LEV
Overload (10mx5stat 6.25 exPr tnot ˚exceeding 22 RH) or 10kV in air) R%
Overload ro a state (56 Pr notC
Damping f(10x r5seat pow xr a 70 40˚C, 90%x x LEV)
Load at rated voltage
t 70˚ C
R%
Derating from rated power a
(1000hrs at 70˚C)
Overload (10 5s state (56 days, exceeding 2 x x LEV)
Overload steady at 6.25 Pr not exceeding LEV
R%
Damp heat(10xx5s at 6.25 xxPr not 40˚C, 90%2RH) or 10kV in air) R%
Climatic
Derating from rated power at 70˚ C
sequence
Overload (10 xx5s at 6.25 xxPr not exceeding 22 x LEV) 10kV in air) R%
Overload (10 5s at 6.25 Pr not exceeding x LEV or
Damp heat steady state (56 days, 40˚C, 90% RH)
R
Climatic
Overload (10 xx5s at 6.25 xxPr not exceeding 22 x LEV) 10kV in air)
%
R%
sequence
R%
category
Overload
state (56
6.25 Pr not
90% RH)
Damp heat steady
(10 5s at
days, 40˚C,
exceeding x LEV or
R%
Climatic category
sequence
R%
Climatic
Damp heat
change
state (56 days, 40˚C, 90% RH)
Temperature rapid
steady
R%
R%
Climatic sequence
R%
Climatic category
Temperature rapid change
R%
R%
Resistance to solder heat
Climatic
Climatic sequence
category
Temperature solder heat
R%
Resistance to rapid change
R%
Vibration
Climatic category
Temperature rapid change
R%
Resistance
R%
Vibration roto solder
rapid change
Temperature
heat
Voltage P of
vR%
R%
olts
Resistance to solder heat
R%
Vibration
R%
Resistance to solder heat
Voltage Proof
volts
R%
Vibration
R%
Voltage
Vibration
Proof
volts
R%
Voltage Proof
volts
volts
Performance Data
Vmax
Vmax
Vmax (kV) (kV)
Vmax (kV) (kV)
1
00
1
00
1
0
1
00
VRW25
Vmax (kV)
1
0
VRW37
VRW25
VRW68
VRW37
VRW25
1
0
1
0
1
0
VRW25
VRW25
VRW68
VRW37
VRW37
VRW37
VRW68
VRW68
VRW68
1
1 0.1
0.1
1
1 0.1
1
0.1
0.1
1
1
0
1
00
1
1
0
1
00
Value (megohms)
1
1
0
1
00
Value
1
(megohms)
10
1
00
1
0
1
00
Maximum peak voltage in accordance with “IEC
1
60065 chapter 14.1”
Value (megohms)
Value (megohms)
14.1”
50 discharges from a 1nF accordance with to V
Value (megohms)
max. chapter
Maximum peak voltage in capacitor charged“IEC 6006512 discharges/minute.
Maximum peak
peak
1nF capacitor charged “IEC max. 12 discharges/minute.
50 discharges from a
voltage in accordance with
V 60065 chapter 14.1”
Maximum
voltage in accordance with to
“IEC 60065 chapter 14.1”
Maximum peak voltage in capacitor charged“IEC 6006512 discharges/minute.
accordance with to
50 discharges from
from a 1nF capacitor charged
V max. chapter 14.1”
50 discharges
a 1nF
to V max. 12 discharges/minute.
50 discharges from a 1nF capacitor charged to V max. 12 discharges/minute.
Application Notes
Application Notes
limits imposed by some PCB materials, derating may be necessary. An
1. Due to operating temperature
Application Notes
Application
temperature
estimate operating
Notes
1. Due toof the temperature rise to be expected by the center materials, derating may be necessary. An
Application Notes
limits imposed at some PCB of the body can be calculated using the
Figure 1. The componentfor VRW shown in
Our standard packaging wiresare taped and
boxed.
boxed. The critical dimensions
is not
shown in
The critical dimensions will
Our standard componentfor VRW is
are
the in
taped
protrude The
1.
packaging wires are shown
dimensions will
will
boxed.1. beyond the outside edge not
The
Figure
Figure
critical
component wires
of
not
and
The
dimensions are shown in
boxed.Alternative packaging edge of the
The critical
tapes.
protrude
component wires will not
of the
Figure 1. The
beyond the outside edge
protrude beyond the outside is available by
Figure Alternative the outside are of the
1. beyond packaging edge not
request. Pre-formed resistors is available by
protrude The component wires will
available
tapes.
tapes. Alternative packaging
supplied
by
is
protrude beyond the outside is available
loose packed in plastic bags are suppliedby
tapes.
request. Pre-formed resistors are
the
Alternative packaging edge of
request. Pre-formed resistors or boxes.
supplied
tapes.
loose packed
packagingor boxes. by
Alternative
in plastic
are supplied
request. Pre-formed resistors is available
loose packed in plastic bags
bags or boxes.
request. Pre-formed resistors or boxes.
loose packed in plastic bags are supplied
loose packed in plastic bags or boxes.
Packaging
Packaging
Packaging
Our standard packaging for VRW is taped and
Packaging
dimensions areisshown in
boxed. The critical
Our standard packaging for VRW taped and
Packaging
1.
of the
operating temperature
Electrical Data.
thermal to operating temperature underexpected at some PCB of
materials, derating may
be necessary. An
1. Due
Due to
temperature rise limits imposed by
by
center materials, derating may
be necessary. An
estimate impedance figures given to be
limits imposed
the
some PCB
the body can be calculated using the
1. Due toof the temperature rise under expected by the
the
PCB materials, derating may be necessary.
the
limits
estimate of the temperature rise to be expected at
body
estimate operating temperature to be Electrical Data. center of the body can be calculated
using
An
thermal impedance figures given
radial,
imposed at some
center of the
leads
can be calculated
using the
2.
VRW resistorstemperature rise
given under Electrical
lancet pre-formed
be supplied with
with expected at the center of the body can
see
The VRW37 is also
goalpost or
Data.
-
be
2.
VRW37 can
impedance
supplied to be radial, goalpost or lancet pre-formed leads. calculated using the
can be
figures
estimate impedance figures given under Electrical Data.
thermal
thermal of the
availableimpedance SMDsupplied with radial, goalpost or lancet pre-formed leads. The VRW37 is also
2. VRW resistors canfigures givenpacked Electrical tape -
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
thermal in ZI-form be format under in blister Data.
https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicationNotes/TN008-resistors-Leadform-Capability.pdf
2. VRW resistors can
goalpost
pre-formed
2. VRW resistors can be supplied with radial, goalpost or
http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
pre-formed
leads. The VRW37 is also
available
is also available in
be supplied with radial,
packed
see
or lancet
tape - see
leads. The VRW37 is also
in ZI-form SMD format
VRW37
resistors can be suppliedpacked in blister tape -or
-
lancet pre-formed leads. The VRW37 is also
ZI-form SMD format
in blister
available in ZI-form
format packed in
in
goalpost
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
2. VRW in ZI-form SMD
SMD format packed
blister tape -
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
with radial,
blister tape
lancet
available
https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/Datasheets/ZI-form.pdf
b
Type
c
available in ZI-form SMD format packed in blister tape -
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
Type
VRW25/37
Type
VRW25/37
VRW68
VRW25/37
Type
VRW25/37
VRW68
VRW68
VRW25/37
VRW68
VRW68
Type
b
52 ±2mm
b
52 ±2mm
73 ±2mm
52 ±2mm
b
52 ±2mm
73 ±2mm
73 ±2mm
52 ±2mm
73 ±2mm
73 ±2mm
b
c
5 ±0.5mm
c
5 ±0.5mm
10 ±0.5mm
5 ±0.5mm
c
5 ±0.5mm
10 ±0.5mm
5
10 ±0.5mm
±0.5mm
10 ±0.5mm
10 ±0.5mm
c
Our standard packaging for VRW is taped and
f1
6
mm
6
6
mm
mm
6
mm
6
mm
f1
f1
f2
c
c
c
c
c
f1 Body location f1-f2 1.4mm
b
b
f1
Body location f1-f2 1.4mm
Body location f1-f2 1.4mm
b
b
f2
f2
f2
f2
© Welwyn
is subject to
(0) 1670 822181 · Facsimile: +44
Northumberland NE22 7AA,
going to print.
· Website: www.welwyn-tt.com
UK
All information
Components Limited
Bedlington,
considered
829465 ·
at time
info@welwyn-tt.com
Telephone: +44
TT Electronics’ own data and is
(0) 1670
accurate
Email:
of
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
©
TT Electronics plc
822181
Limited
Bedlington, Northumberland NE22 7AA, UK
Welwyn Components
· Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
Components Limited
Bedlington, Northumberland NE22 7AA, UK
· Website: www.welwyn-tt.com
© Welwyn
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com
General Note
© Welwyn
reserves the right to make changes in product
Northumberland NE22 7AA,
liability.
TT Electronics
Components Limited
Bedlington,
specification without notice or
UK
b
Body location f1-f2 1.4mm
Body location f1-f2 1.4mm
6
mm
6
6
mm
mm
6
mm
6
mm
BI Technologies IRC Welwyn
05.08
05.08
www.ttelectronics.com/resistors
05.08
05.08
05.08
11.20
71
71
71
71
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