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High Voltage Planar Dividers
4530 Series
Welwyn Components
* Dissipation up to 4.5 Watts at 70C * Voltage up to 15 kV dc * TCR tracking down to 50 ppm/C * Suitable for high voltage precision dividers,
feedback circuits and measurement systems
Electrical Data
4531* Power rating at 70C Resistance range Limiting element voltage TCR (20C to 70C) Resistance tolerance Resistance ratio tolerances Standard values Ambient temperature range C watts ohms volts ppm/C % % 1.0 6.5K 4532* 1.7 6.5K 4533* 2.0 10K 4534* 3.0 10K 100+ 1, 2, 5 1, 2, 5 Any value to order -55 to 125 4535* 2.8 15K 4536* 3.6 15K 4537* 4.5 15K 20K to 130M 36K to 250M 36K to 250M 62K to 450M 51K to 370M 82K to 660M 180K to 1.4G
+TCR tracking 50, 100 ppm/C *5th or 6th digit determines protection and lead type (see marking)
Physical Data
Dimensions (mm) of Uncoated Resistors* Substrate Type 4531 4532 4533 4534 4535 4536 4537 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 T max 2 2 2 2 2 2 2 V nom 5.1 5.1 5.1 5.1 7.62 7.62 7.62 P nom 20.3 20.3 33.0 33.0 45.7 45.7 45.7 nominal 25 x 8.5 25 x 12.5 38 x 8.5 38 x 12.5 50 x 8.5 50 x 12.5 50 x 25
x0.05
*Conformally coated resistors: Add 1mm to dimensions L and H and 0.5mm to T. Coating can be extended up to 2mm down leads. Example: A conformally coated 4531 measures 26.7 x 10 x 2.5 max.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue B * 03.02
(c) 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
207
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 70C Derating from rated power at 70C 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 125C < 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 -55C, upper temperature category is 125C. 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.
(c) 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 208
Issue B * 03.02

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