4530 WELWYN | Alldatasheet

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Technical content

4530 Series

  • Dissipation up to 4.5 Watts at 70°C
  • Voltage up to 15 kV dc
  • TCR tracking down to 50 ppm/°C
  • Suitable for high voltage precision dividers, feedback circuits and measurement systems 4531* 4532* 4533* 4534* 4535* 4536* 4537* Resistance range ohms 20K to 130M 36K to 250M 36K to 250M 62K to 450M 51K to 370M 82K to 660M 180K to 1.4G Limiting element voltage volts 6.5K 6.5K 10K 10K 15K 15K 15K TCR (20°C to 70°C) ppm/°C 100+ Resistance tolerance % 1, 2, 5 Resistance ratio tolerances % 1, 2, 5 Standard values Any value to order Ambient temperature range °C -55 to 125 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 207 +TCR tracking 50, 100 ppm/°C *5th or 6th digit determines protection and lead type (see marking) x0.05 Dimensions (mm) of Uncoated Resistors* Substrate Type L max H max T max V nom P nom nominal 4531 25.7 9 2 5.1 20.3 25 x 8.5 4532 25.7 13 2 5.1 20.3 25 x 12.5 4533 38.7 9 2 5.1 33.0 38 x 8.5 4534 38.7 13 2 5.1 33.0 38 x 12.5 4535 51.2 9 2 7.62 45.7 50 x 8.5 4536 51.2 13 2 7.62 45.7 50 x 12.5 4537 51.2 25.7 2 7.62 45.7 50 x 25 Physical Data *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.

© 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 Issue B · 03.02 Welwyn Components 208 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. 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. 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. Multiple dividers R1, R2, R3 etc. Packaging Packed in foam within a box. 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. 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 Material Solder-coated phosphor bronze lead-frame or 0.8mm dia, copper wire leads. Solderability Meets the requirements of IEC 115-1, Clause 4.17.3.2. Marking Legend marked with type reference, resistance value, tolerance ratio and manufacturing date code. 5th digit: 1 refers to leadframe 2 refers to copper wire lead 6th digit: 2 refers to conformal coating 3 refers to screen printed protection 4 refers to unprotected components Solvent Resistance The marking and protection will withstand all commonly used industrial cleaning solvents.Maximum Typical Load: 1000 hours at 70°C ∆R% 5 0.3 Derating from rated power at 70°C Zero at 125°C Shelf life: 12 months at room temperature ∆R% 0.3 < 0.1 Temperature rapid change ∆R% 0.1 0.02 Resistance to solder heat ∆R% 0.05 0.02 4531, 4532 5 < 3 Voltage coefficient of resistance ppm/volt 4533, 4534 3 < 2 4535, 4536, 4537 1.5 < 1 Performance Data