Resistors
High Voltage
Planar Resistors
High Voltage Planar Resistors
4500 Series
Welwyn Components
4500 Series
up to 20kV dc.
•
Voltages
Voltages
up to 4.5
dc.
•
Powers
up to 20kV
Watts
Powers up to 4.5 Watts
•
TCR to 50ppm/°C
TCR to 50ppm/°C
•
Customs design service available
Customs design service available
•
Planar construction gives low inductance and
Planar construction gives low inductance and capacitance
capacitance
All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
4501
Power rating at 70°C
Resistance range
Limiting element voltage
TCR (20°C to 70°C)
Resistance tolerance
Values
Ambient temperature range
Value ranges for TCR of 100 ppm/°C
Value ranges for TCR of 150 ppm/°C
Value ranges available for
TCR of 50ppm/°C
<100M
<150M
<200M
<250M
<250M
<300M
<600M
°C
≤150M
>150M
≤270M
>270M
≤270M
>270M
watts
ohms
volts
ppm/°C
%
1
20k to 500M
10k
4502
1.7
36k to 750M
10k
4503
2
36k to 750M
15k
4504
3
62k to 1G
15k
1, 2, 5
Any value to order
-55 to 125
≤470M
>470M
≤390M
>390M
≤680M
>680M
≤1.5G
4505
2.8
51k to 1G
20k
4506
3.6
82k to 1G
20k
4507
4.5
180k to 1.5G
20k
100, 150 (see table below for 50ppm)
Physical Data
Dimensions (mm) of Uncoated Resistors*
P (nominal)
Type
4501
4502
4503
4504
4505
4506
4507
L max
25.7
25.7
38.7
38.7
51.2
51.2
51.2
H max
9
13
9
13
9
13
25.7
W max
2
2
2
2
2
2
2
450000
20.3
20.3
33.0
33.0
45.7
45.7
45.7
450000A
22.9
22.9
35.6
35.6
48.3
48.3
48.3
*Conformally coated resistors: Add 1mm to dimensions L and H and 0.5mm to W.
General Note
General Note
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
at time
or liability.
to print.
All information is subject to Welwyn’s own data and is considered accurate
notice
of going
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
BI Technologies IRC Welwyn
A subsidiary of
TT electronics plc
www.ttelectronics.com/resistors
Issue B · 03.02
05.21
205
High Voltage
Planar Resistors
High Voltage
High Voltage Planar Resistors
4500 Series
Planar Resistors
4500 Series
4500 Series
Construction
Strength
A high quality alumina substrate is printed with a specially
selected high voltage thick film resistor ink based on a
Construction
ruthenium oxide/glass system. A choice of protective systems
A high quality alumina substrate is printed with a specially
is available. voltage thick film resistor ink based on a
selected high
ruthenium oxide/glass system. A choice of protective systems
Choice of
is available.
Protection
As standard components are supplied conformally coated
with an epoxy resin. By special request components can be
Choice of Protection
supplied unprotected or with supplied conformally coated
As standard components are a screen printed epoxy
‘handling’ protection.
with an epoxy resin. By special request components can be
supplied unprotected or with a screen printed epoxy
Terminations
‘handling’ protection.
Material
Solder coated phosphor bronze leadframe.
Terminations
Resistors can be supplied without leads, in
which coated phosphor bronze enable
Material
Solder case palladium silver padsleadframe.
electrical connection to be made.
Resistors can be supplied without leads, in
which case palladium silver pads enable
electrical connection to be made.
Welwyn Components
Welwyn Components
The terminations meet the requirements of
IEC 68.2.21.
Strength
The terminations meet the requirements of
Solderability
The terminations meet the requirements of
IEC 68.2.21.
IEC 115-1, Clause 4.17.3.2
Solderability
The terminations meet the requirements of
Marking
IEC 115-1, Clause 4.17.3.2
Type and protection system references, resistance value
tolerance and
Marking
manufacturing date code are legend marked.
The and protection conforms to IEC 62.
Typeresistance value system references, resistance value
tolerance and manufacturing date code are legend marked.
Solvent Resistance
The resistance value conforms to IEC 62.
The body protection and marking are resistant to all normal
industrial
Resistance
Solvent
cleaning solvents suitable for printed circuits.
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Performance Data
Performance Data
Load at rated power: 1000 hours at 70°C
Shelf life: 12 months at room temperature
Load at rated power: 1000 hours at 70°C
Derating
Shelf life: 12 rapid change
Temperature months at room temperature
Derating to solder heat
Resistance
Temperature rapid change
Voltage coefficient of
Resistance to solder heat
Resistance ppm/volt
Voltage coefficient of
Resistance ppm/volt
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
4501 and 4502
∆R%
4503 and 4504
4505, 4501 and 4502
4506 and 4507
4503 and 4504
4505, 4506 and 4507
Actual
Maximum
5
Maximum
0.3
5
0.3
0.1
0.05
0.1
5
0.05
3
5
1.5
3
1.5
Zero at 125°C
Actual
Typical
0.3
Typical
<0.1
0.3
<0.1
0.02
0.02
0.02
<3
0.02
<2
<3
<1
<2
<1
Zero at 125°C
Application Notes
The terminations should not be bent closer than 1.5mm from
Application Notes
the body, and the recommended minimum bend radius is 1mm.
The terminations should not be bent closer than 1.5mm from
Duebody, and the recommended minimum between theis 1mm.
the to the high voltage which can appear bend radius resistor
body and any adjacent metal part, resistors should be mounted
at anto the highdistance whichotherappear between the resistor
Due adequate voltage from can conducting parts.
body and any adjacent metal part, resistors should be mounted
Due to the possibility of from other conducting it is
at an adequate distance surface condensation parts.
recommended that high voltages are not applied to resistors
in conditions of high of surface
Due to the possibility humidity. condensation it is
recommended that high voltages are not applied to resistors
Design Flexibility
in conditions of high humidity.
The experience of Welwyn engineers has been used to design
this generation of high voltage planar resistors to be suitable
Design Flexibility
for majority of applications. However, should an application
Theaexperience of Welwyn engineers has been used to design
require particular high voltage Welwyn designers are
this generation ofconsideration,planar resistors to be suitable
available to provide advice and where applicable, application
for a majority of applications. However, should anto
recommend a non-standard product. Special sizes, are
require particular consideration, Welwyn designers designs
etc, can to provide advice and notice.
availablebe prototyped at short where applicable, to
recommend a non-standard product. Special sizes, designs
etc, can be prototyped at short notice.
Non Standard Optional Features
The options listed below are some of the special features
which
Standard Optional Features
Non
may be provided, subject to agreement.
Special substrate below are some of the special features
The options listedsize.
Leadless version with palladium to agreement.
which may be provided, subject silver solder pads.
termination length, diameter and pitch.
Special substrate size.
Special designs with palladium silver
Leadless versionfor pulse applications. solder pads.
Resistance value outside stated range.
Special termination length, diameter and pitch.
Tolerance better than ± applications.
Special designs for pulse1%
Temperature coefficient of ± 50ppm/°C.
Resistance value outside stated range.
Tolerance better than ± 1%
Enquiries
coefficient of
Temperature
Welcomed
± 50ppm/°C.
Packaging
Enquiries Welcomed
Packed in foam within a box.
Packaging
Packed in foam within a box.
General Note
© Welwyn Components
make changes in product
Northumberland NE22 7AA,
liability.
Limited
Bedlington,
specification without notice or
UK
TT Electronics reserves the right to
BI Technologies IRC Welwyn
Issue B · 03.02
www.ttelectronics.com/resistors
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
206
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT Electronics plc
206
Issue B · 03.02
05.21
Special Edition for Assessment Centres
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