High Voltage
Planar Dividers
4530 Series
Construction
A high quality alumina substrate is printed with a specially
selected high voltage resistor ink based on a ruthenium
oxide/glass system. A choice of protective systems is available.
Welwyn Components
Marking
Legend marked with type reference, resistance value,
tolerance ratio and manufacturing date code.
5th digit:
6th digit:
1 refers to leadframe
2 refers to copper wire lead
2 refers to conformal coating
3 refers to screen printed protection
4 refers to unprotected components
Choice of Protection
As standard components are supplied conformally coated
with an epoxy resin. By special request components can be
supplied unprotected or with a screen printed epoxy
‘handling’ protection.
Solvent Resistance
Terminations
Material
Solder-coated phosphor bronze lead-frame or
0.8mm dia, copper wire leads.
The marking and protection will withstand all commonly used
industrial cleaning solvents.
Solderability
Meets the requirements of IEC 115-1, Clause
4.17.3.2.
Performance Data
Maximum
Load: 1000 hours at 70°C
Derating from rated power at 70°C
Shelf life: 12 months at room temperature
Temperature rapid change
Resistance to solder heat
Voltage coefficient of resistance ppm/volt
∆R%
∆R%
∆R%
4531, 4532
4533, 4534
4535, 4536, 4537
0.3
0.1
0.05
5
3
1.5
∆R%
5
Zero at 125°C
< 0.1
0.02
0.02
<3
<2
<1
Typical
0.3
Application Notes
The terminations should not be bent closer than 1.5mm from
the body, and the recommended minimum bend radius is 1mm.
Due to the high voltage which can appear between the resistor
body and any adjacent metal part, resistors should be mounted
at an adequate distance from other conducting parts.
Non Standard Optional Features
The options listed below are some of the special features
which may be provided, subject to agreement.
Special substrate size.
Leadless version with palladium silver solder pads.
Special termination length, diameter and pitch.
Special designs for pulse applications.
Resistance value outside stated range.
Multiple dividers R1, R2, R3 etc.
Temperature Category
Lower temperature category is -55°C, upper temperature
category is 125°C. Due to the possibility of surface
condensation it is recommended that high voltage is not
applied to resistors in conditions of high humidity.
Packaging
Packed in foam within a box.
Design Flexibility
The experience of Welwyn engineers has been used to design
this generation of high voltage planar resistors to be suitable
for a majority of applications. However, should an application
require particular consideration, Welwyn designers are
available to provide advice and where applicable, to
recommend a non-standard product. Special sizes, designs
etc, can be prototyped at short notice.
© 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
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Issue B · 03.02
WELWYN [ WELWYN COMPONENTS LIMITED ]
