High Voltage
Voltage
Planar Resistors
Planar Resistors
4500 Series
4500 Series
Welwyn Components
·
Voltages up
20kV dc.
dc.
•
Voltages up to
to 20kV
·
Powers up to 4.5 Watts
•
Powers up to 4.5 Watts
·
TCR to 50ppm/°C
TCR to 50ppm/°C
•
Customs design service available
·
•
Planar construction gives low inductance
·
Customs design service available
•
Planar construction gives low inductance and
andcapacitance
capacitance
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 quoted 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 theto Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
All information is subject right to make changes in product specification without notice or liability.
TT electronics plc
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
Issue B · 03.02
Telephone: +44 (0) 1670
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
08. 11
205
High Voltage
Planar Resistors
High Voltage
High Voltage
Planar Resistors
4500 Series
Planar Resistors
4500 Series
4500 Series
Construction
A high quality alumina substrate is printed with a specially
selected high voltage thick film resistor ink based on a
Construction
ruthenium oxide/glass substrate is printed with a specially
A high quality aluminasystem. A choice of protective systems
is available.
selected high voltage thick film resistor ink based on a
ruthenium oxide/glass system. A choice of protective systems
Choice of Protection
is available.
As standard components are supplied conformally coated
with an
of Protection
Choice
epoxy resin. By special request components can be
supplied unprotected or are a screen printed epoxy
As standard componentswith supplied conformally coated
‘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.
Strength
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
Actual
Maximum
Zero at 125°C
0.1
0.05
0.1
5
0.05
3
5
1.5
3
1.5
Zero at 125°C
<3
<2
<3
<1
<2
<1
Typical
0.3
Typical
<0.1
0.3
<0.1
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.
Non Standard Optional Features
The options listed below are some of the special features
which may be provided, subject to agreement.
Non Standard Optional Features
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 stated range.
Resistance value outsideof ± 50ppm/°C.
Tolerance better than ± 1%
Enquiries Welcomed
± 50ppm/°C.
Temperature coefficient of
The terminations should not be bent closer than 1.5mm from
Due to the high voltage which can appear bend radius resistor
the body, and the recommended minimum between theis 1mm.
body and any adjacent metal part, resistors should be mounted
at an adequate voltage from can conducting parts.
Due to the highdistance whichotherappear between the resistor
body and any adjacent metal part, resistors should be mounted
Due adequate distance surface condensation parts.
at anto the possibility of from other conducting it is
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
Design Flexibility
voltage planar resistors to be suitable
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.
Packaging
Enquiries Welcomed
Packed in foam within a box.
Packaging
Packed in foam within a box.
General Note
©
electronics reserves the right to make changes in product specification without notice or liability.
Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
TT
206
206
Issue B · 03.02
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.
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 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
08. 11
High Voltage
High Voltage
Planar Resistors
Planar Resistors
4500 Series
4500 Series
Welwyn Components
Ordering Procedure
Example: 4503 on 35.6mm pitch with leadframe terminals and conformal coat at 15 megohms
and 1% tolerance -
450312A–15MF
I
Type
Terminal
1
2
2
3
4
Leadframe
Copper wire
Conformal coating
Screen printed protection
Unprotected
Standard
Alternative
Protection
Pitch
A
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
G
J
1%
2%
5%
Packing
I
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
Issue B · 03.02
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
206
08. 11
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