High Voltage
High Voltage
Thick Film Resistors
Thick Film Resistors
VRW Series
VRW Series
·
VRW37 approved to BS / EN / IEC 60065
·
VRW37 meets the requirements of BS / EN
size
High working voltage to 10kV in compact
/
·
IEC 60065
range to 68M
High ohmic
·
High working voltage to 10kV in compact
High pulse load capability
size
·
High ohmic range to 68M
material
Robust flameproof coating
·
High pulse load capability
RoHS compliant
Robust flameproof coating material
RoHS compliant
Welwyn Components
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
12.7
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
reserves the
make
to make changes in
specification without notice or
notice or liability.
Welwyn Components
the right to
right
changes in product
product specification without
liability.
All information is subject to TT electronics’ own data and is considered accurate at time
going to print.
information is subject to Welwyn’s own data and is considered accurate at time of
of going to print.
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT electronics plc
A subsidiary of
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
TT electronics plc
Issue C ·
05.08
07.06
09. 11
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
High Voltage
High Voltage
High Voltage
High Voltage
Resistors
High Voltage
Thick Film Resistors
Thick Film
Thick Film Resistors
Thick Film Resistors
Thick Film Resistors
SQP
VRW Series
SQP
VRW Series
VRW
SQP
Series
VRW Series
SQP
VRW Series
Welwyn
Welwyn
Welwyn
Welwyn
Components
Components
Components
Components
Performance
Performance
Performance
Performance
Data
Data
Data
Data
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
vol%
R ts
vol%
R ts
volts
volts
Pulse Performace
Performace
Pulse Performance
Pulse Performance
Pulse Performace
Pulse
Performance
Performace
Pulse Performance
Vmax (kV) (kV)
Vmax (kV)
Vmax (kV)
Vmax
Load at rated voltage (1000hrs at 70˚C)
Load at rated voltage (1000hrs at 70˚C)
Deratiatgrated voltage ower at 7at C
Load n from rated p (1000hrs 0˚ 70˚C)
Deratiatgrated voltage ower at 7at C
Load n from rated p (1000hrs 0˚ 70˚C)
Overload from r5s eat p45seofftat 0˚ C x Pr not 2 x LEV) 2 x LEV)
Derating (10 x 5s on,6.25 x a 7 6.25
at d ow r Pr not exceeding exceeding
Overload from r5s eat p45seofftat 0˚ C x Pr not 2 x LEV) 2 x LEV)
Derating (10 x 5s on,6.25 x a 7 6.25
at d ow r Pr not exceeding exceeding
Damp heat steady at 45s x Pr not 40˚C, 90% RH)
Overload (10 x 5s on,6.25 off at 6.25 x Pr not 2 x LEV) 2 x LEV)
5s state (56 days, exceeding exceeding
Damp heat steady at 45s x Pr not 40˚C, 90% RH)
Overload (10 x 5s on,6.25 off at 6.25 x Pr not 2 x LEV) 2 x LEV)
5s state (56 days, exceeding exceeding
Climatic sequence state (56 days, 40˚C, 90% RH)
Damp heat steady
Climatic sequence
Damp heat steady state (56 days, 40˚C, 90% RH)
Climatic category
sequence
Climatic category
Climatic sequence
Temperature rapid change
Climatic category change
Temperature rapid
Climatic category
Resistance to rapid change
Temperature solder heat
Resistance to rapid change
Temperature solder heat
Vibration to solder heat
Resistance
Vibration to solder heat
Resistance
Voltage Proof
Vibration
Voltage Proof
Vibration
Voltage Proof
Voltage Proof
1
00
1
00
1
00
1
00
Maximum
Maximum
1 5*
Maxi
.
mum
1 5*
Maxi
.
mum
1.5*
1.5*
1
2
1
2
115
.
2
115
.
2
1.5
1.5
1.5
1.5
1.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Typical
Typical
Ty
0.
i
4
al
pc
Ty
0.
i
4
al
pc
zero at 155˚ C
0.4
zero at 155˚ C
0.4
0.15
zero at 155˚ C
0.15
zero at 155˚ C
015
0..1
015
0..1
0.1
0.2
2
0.1
55/155/56
0.2
55/155/56
0.2
0.05
55/155/56
0.05
55/155/56
0.05
0.05
0.05
0.05
0.05
0.05
700 min
0.05
700 min
0.05
* 2% for ohmic values above 24M
700 2% for ohmic values above 24M
min
*
700 min
* 2% for ohmic values above 24M
* 2% for ohmic values above 24M
1
0
1
0
1
0
1
0
VRW25
VRW25
VRW37
VRW37
VRW25
VRW25
VRW68
VRW68
VRW37
VRW37
VRW68
VRW68
1
1
0.1
1 0.1
1
0.1
0.1
Maximum peak voltage in accordance with “IEC 60065 chapter 14.1”
Maximum peak voltage in accordance with “IEC 60065 chapter 14.1”
50 discharges from a 1nF capacitor charged“IEC 6006512 discharges/minute.
Maximum peak voltage in capacitor charged“IEC 6006512 discharges/minute.
50 discharges from a 1nF accordance with to V max. chapter 14.1”
Maximum peak voltage in accordance with to V max. chapter 14.1”
50 discharges from a 1nF capacitor charged to V max. 12 discharges/minute.
50 discharges from a 1nF capacitor charged to V max. 12 discharges/minute.
1
Value
Value
1
Value
Value
1
1
1
0
(megohms)
(megohms)
1
0
(megohms)
(megohms)
1
0
1
0
1
00
1
00
1
00
1
00
estimate of the temperature rise to be expected by the center of the body can be may be necessary. An
1. Due to operating temperature limits imposed at some PCB materials, derating calculated using the
estimate of the temperature rise to be expected by the center of the body can be may be necessary. An
1. Due impedance figures given under imposed at some PCB materials, derating calculated using the
operating temperature limits
thermaltoof the temperature rise to be expected at the center of the body can be calculated using the
estimate of the temperature rise under Electrical Data.
thermal impedance figures given to be expected at the center of the body can be calculated using the
Electrical Data.
estimate
thermal resistors can be supplied under Electrical Data.or lancet pre-formed leads. The VRW37 is also
2. VRW resistors can be supplied under Electrical Data.or lancet pre-formed leads. The VRW37 is also
thermal impedance figures given with radial, goalpost
2. VRW impedance figures given with radial, goalpost
availableresistors canformat with Z formed leads and packed in blister tape. Consult Factory foris also
2. VRW resistors canformat with Z formed leads and packed in blister tape. Consult Factory foris also
available in an SMD be supplied with radial, goalpost or lancet pre-formed leads. The VRW37 details.
2. VRW in an SMD be supplied with radial, goalpost or lancet pre-formed leads. The VRW37 details.
available in an SMD format with Z formed leads and packed in blister tape. Consult Factory for details.
available in an SMD format with Z formed leads and packed in blister tape. Consult Factory for details.
Application Notes
Application Notes
Application Notes
limits imposed by some PCB materials, derating may be necessary. An
1. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An
Application Notes
1. Due to operating temperature
Packaging
Packaging
Packaging
Our standard packaging for VRW is taped and
Packaging
Our standard packaging for VRW is taped and
boxed. The critical dimensions are is taped in
Our standard packaging for VRW is taped in
boxed. The critical dimensions are shown and
Our standard componentfor VRW shown and
packaging
Figure 1. The component wiresare shown in
boxed. 1. The
Figure The critical dimensions are shown in
wires will not
not
boxed. The critical dimensions willof the
protrude beyond the outside edge of the
Figure 1. beyond the outside edge not
protrude The component wires will not
Figure Alternative packaging is available by
1. The component wires will
tapes. Alternative packaging edge of the
protrude beyond the outside is available by
tapes.
protrude Pre-formed resistors are supplied
beyond the outside edge of the
request. Pre-formed resistors is available by
tapes. Alternative packaging is available by
request.
tapes.packed in plastic bags or boxes.
Alternative packaging are supplied
loose packed in plastic bags or boxes.
request. Pre-formed resistors are supplied
loose
request. Pre-formed resistors are supplied
loose packed in plastic bags or boxes.
loose packed in plastic bags or boxes.
Type
Type
VRW25/37
Type
VRW25/37
Type
VRW68
VRW25/37
VRW68
VRW25/37
VRW68
VRW68
b
b
52 ±2mm
b
52 ±2mm
b
73 ±2mm
52 ±2mm
73 ±2mm
52 ±2mm
73 ±2mm
73 ±2mm
c
c
5 ±0.5mm
c
5 ±0.5mm
c
10±0.5mm
5 ±0.5mm
10±0.5mm
5 ±0.5mm
10 ±0.5mm
10 ±0.5mm
c
c
c
c
f1
f1
6
6
mm
mm
6
6
mm
mm
f1
f1
f2
f2
b
b
Body location f1-f2
Body location f1-f2
b
b
Body location f1-f2
Body location f1-f2
f2
f2
1.4mm
1.4mm
1.4mm
1.4mm
6
6
mm
mm
6
6
mm
mm
General Note
TT electronics
© Welwyn
reserves the right to make changes in product specification without notice or liability.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Components Limited
Bedlington, Northumberland NE22 7AA, UK
05.08
Telephone: +44
is subject
822181 · Facsimile: +44 (0)
and is
829465 · Email: info@welwyn-tt.com
to
Website: www.welwyn-tt.com
All information
(0) 1670
to TT electronics’ own data
1670
considered accurate at time of going
·
print.
05.08
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
05.08
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
05.08
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
09. 11
71
71
71
71
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