MAR40 WELWYN | Alldatasheet
Document overview
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- PDF pages: 2
Technical content
- Tolerance down to 0.005%
- Very low TCRs
- Rugged moulded protection
- Matched sets available Dimensions (mm) and Weight (g) Wt. 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 Notes Power rating at 85°C watts 0.3 Resistance range ohms 20R0 to 400K Higher values by agreement Limiting element voltage volts 250 TCR (0°C to +60°C) ppm/°C 2 (T18) & 5 (T16) TCR (-55°C to +125°C) ppm/°C 5 (T18) & 10 (T16) Standard values E24, E96 preferred Any value to order Thermal impedance °C/watt 80 Ambient temperature range °C - 55 to +155 Electrical Data Physical Data Issue B · 03.02 A subsidiary of TT electronics plc Welwyn Components 180 L W S H T d Construction Ceramic rods are coated with a metal film and plated steel caps are force fitted. A helical cut is used to adjust the film to its final value. Termination wires are welded to the caps and the resistor is protected with a multiple lacquer coat and encapsulated in an epoxy moulded protection. Terminations Material Solder-coated copper wire. Strength The terminations meet requirements of IEC 68.2.21 and MIL-STD 1276. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 and MIL-STD 202. Marking Type reference, TCR code, resistance value and tolerance. The resistance value marking conforms to IEC 62. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits.
Test conditions per MIL-R55182 except where noted Actual Performance Maximum Typical Load at rated power: 1000 hrs at 85°C ∆R% 0.05 0.02 Dry heat: 1000 hrs at 155°c ∆R% 0.10 0.05 Shelf life: 12 months at room temperature ∆R% 0.01 0.003 Derating from rated power at 85°c Zero at 155°C Short term overload ∆R% 0.01 0.001 Damp heat (IEC 68-2-3) ∆R% 0.04 0.02 Thermal shock (tested per method 107, MIL-STD 202 condition F) ∆R% 0.04 0.01 Effect of solder (tested per method 210, MIL-STD 202) ∆R% 0.02 0.003 Vibration and bump ∆R% 0.02 0.002 Noise (in a decade of frequency) µV/V 0.1 0.03 Voltage coefficient of resistance ppm/V 0.2 <0.05 Ultra Precision Metal Film Resistors MAR 40/42 series © 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 181 Issue B · 03.02 Welwyn Components Performance Data Matched Sets and Networks Welwyn has many years experience in the supply of matched sets of precision resistors. Resistors in a set can be supplied matched for tolerance and TCR down to 0.005% and 1ppm/°C of each other. Packaging The standard packaging is loose in boxes of 50 or 300 resistors.