4500 WELWYN | Alldatasheet

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Technical content

4500 Series

  • 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 4501 4502 4503 4504 4505 4506 4507 Power rating at 70°C watts 1 1.7 2 3 2.8 3.6 4.5 Resistance range ohms20k to 500M 36k to 750M 36k to 750M 62k to 1G 51k to 1G 82k to 1G 180k to 1.5G Limiting element voltage volts 10k 10k 15k 15k 20k 20k 20k TCR (20°C to 70°C) ppm/°C 100, 150 (see table below for 50ppm) Resistance tolerance % 1, 2, 5 ValuesAny value to order Ambient temperature range °C -55 to 125 Value ranges for TCR of 100 ppm/°C≤150M≤270M≤270M≤470M≤390M≤680M≤1.5G Value ranges for TCR of 150 ppm/°C >150M >270M >270M >470M >390M >680M Value ranges available for TCR of 50ppm/°C <100M <150M <200M <250M <250M <300M <600M 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. © 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 Electrical Data Issue B · 03.02 A subsidiary of TT electronics plc Welwyn Components 205 Dimensions (mm) of Uncoated Resistors* P (nominal) Type L max H max W max 450000 450000A 450125.7 9 2 20.3 22.9 450225.7 13 2 20.3 22.9 450338.7 9 2 33.0 35.6 450438.7 13 2 33.0 35.6 450551.2 9 2 45.7 48.3 450651.2 13 2 45.7 48.3 450751.2 25.7 2 45.7 48.3 Physical Data *Conformally quoted resistors: Add 1mm to dimensions L and H and 0.5mm to W. 4500 series new 2/6/03 4:01 pm Page 1

© Welwyn Components LimitedBedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.comIssue B · 03.02 Welwyn Components 206 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. 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. 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. Enquiries Welcomed Packaging Packed in foam within a box. 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. 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. Terminations MaterialSolder coated phosphor bronze leadframe. Resistors can be supplied without leads, in which case palladium silver pads enable electrical connection to be made. StrengthThe terminations meet the requirements of IEC 68.2.21. SolderabilityThe terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 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. Actual Maximum Typical Load at rated power: 1000 hours at 70°C∆R% 0.3 Shelf life: 12 months at room temperature∆R% <0.1 DeratingZero at 125°C Temperature rapid change∆R% 0.1 Resistance to solder heat∆R% 0.05 Voltage coefficient of 4501 and 4502 5 <3 Resistance ppm/volt 4503 and 4504 3 <2 4505, 4506 and 4507 1.5 <1 Performance Data 4500 series new 2/6/03 4:01 pm Page 2