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| High Voltage Planar Resistors 4500 Series Welwyn Components * Voltages up to 20kV dc. * Powers up to 4.5 Watts * TCR to 50ppm/C * Customs design service available * Planar construction gives low inductance and capacitance Electrical Data 4501 Power rating at 70C Resistance range Limiting element voltage TCR (20C to 70C) 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 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 205 High Voltage Planar Resistors 4500 Series Construction A high quality alumina substrate is printed with a specially selected high voltage thick film resistor ink based on a ruthenium oxide/glass system. A choice of protective systems is available. Strength Welwyn Components The terminations meet the requirements of IEC 68.2.21. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 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. Marking Type and protection system references, resistance value tolerance and manufacturing date code are legend marked. The resistance value conforms to IEC 62. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Terminations Material Solder coated phosphor bronze leadframe. Resistors can be supplied without leads, in which case palladium silver pads enable electrical connection to be made. Performance Data Actual Maximum Load at rated power: 1000 hours at 70C Shelf life: 12 months at room temperature Derating Temperature rapid change Resistance to solder heat Voltage coefficient of Resistance ppm/volt R% R% 4501 and 4502 4503 and 4504 4505, 4506 and 4507 0.1 0.05 5 3 1.5 <3 <2 <1 R% R% Zero at 125C Typical 0.3 <0.1 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. Due to the possibility of surface condensation it is recommended that high voltages are not applied to resistors in conditions of high humidity. 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. Tolerance better than 1% Temperature coefficient of 50ppm/C. 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. Enquiries Welcomed Packaging Packed in foam within a box. (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 206 Issue B * 03.02 |
Price & Availability of 4502
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