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High Voltage Thick film Resistors
HV Series
Welwyn Components
* * * *
Resistance up to 250M Low temperature coefficient of resistance Working voltage up to 20kV Sets of resistors with matched characteristics
Electrical Data
HV31 Power rating at 70C Resistance range Limiting element voltage TCR (20C to 70C) Resistance tolerance Values Thermal impedance Ambient temperature range C/watt C 75 70 watts ohms volts ppm/C % 0.5 1K to 50M 1K 2K HV32 0.75 2K 4K HV33 1.0 4K 8K 50, 100 1, 2, 5 E24 preferred 60 -55 to 155 65 60 Any value to special order HV34 1.25 7K 14K HV35 1.5 10K 20K In air In oil Notes 1K to 100M 1K to 150M 1K to 200M 1K to 250M
Physical Data
Dimensions (mm) & Weight (g) PCB mounting centres 12.7 25.4 18.4 44.4 57.2 Min. Bend Radius 0.6 0.6 1.2 0.6 0.6
Type HV31 HV32 HV33 HV34 HV35
L max 10.0 19.0 15.5 38.0 50.8
D max 3.5 3.6 5.3 3.6 3.6
f min 30.0 30.0 30.0 30.0 30.0
d nom 0.6 0.6 0.8 0.6 0.6
Wt. nom 0.5 0.6 1.2 1.1 1.25
d
D
L
f
Construction
A ruthenium oxide based resistive film is fired onto a high quality ceramic former. Brass caps are force fitted to the HV32, 34 and 35 rods and plated steel caps to the 31 and 33 sizes. The resistor is adjusted to value by a helical cut in the film, and the body is protected with a silicone coating.
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Terminations
Material Strength Solder coated copper wire. The terminations meet the requirements of IEC 68.2.21.
Marking
Type reference, resistance value, tolerance and date code are legend marked. The resistance values conform to IEC 62.
Solderability The terminations meet the requirements of IEC 115.1, Clause 4.17.3.2
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
195
High Voltage Thick film Resistors
HV Series
Welwyn Components
Performance Data
Maximum Load at rated power: 1000 hours at 70C Shelf life: 12 months at room temperature Derating from rated power at 70C Noise (in a decade of frequency) Voltage coefficient of resistance V/V ppm/volt 5 5 R% R% 1 0.3 Zero at 155C <2.5 <2 Typical 0.3 0.1
Matched Sets
Resistors in a set can be supplied for use as precision voltage dividers matched for tolerance and TCR down to 0.5% and 10ppm/C. ENQUIRIES ARE WELCOMED FOR SPECIAL RESISTORS AND SETS
Application Notes
Mounting
Due to the high voltage which can appear between the end cap and any adjacent metal part, resistors should be mounted at an adequate distance from other conductors. For some high voltage applications it is required to immerse the components in oil or gas to reduce the effects of corona and surface tracking. The protective coating is suitable for these applications. The axial termination should not be bent closer than twice the diameter of the terminal wire from the body of the resistor. When the resistors are required to be potted, the preferred encapsulant is a silicone compound. For voltage dividers with a low resistance section below the minimum available value of 1k ohms, it is normal practice to use a Welwyn resistor, RC Series, obtainable down to 1ohm.
Packaging
Resistors are supplied packed in boxes.
Standard Quantities Per Box
All Types 10 or 20 per 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 196
Issue B * 03.02

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