MFR4P WELWYN | Alldatasheet
Document overview
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Technical content
- Smallest size for power rating
- Resistance range: 1 ohm to 1M ohms
- Temperature coefficient down to 50ppm/°C MFR4P Power rating at 70°C watts 0.6 Resistance range ohms 0R22 to 1M Limiting element voltage volts 250 TCR ppm/°C <1R: 300 >=1R: 50 Resistance tolerance % 0.5, 1, 2, 5* Standard values E24 preferred Thermal impedance °C/watt 130 Ambient temperature range °C -55 to 155 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 D · 03.06 A subsidiary of TT electronics plc Welwyn Components 138 Construction The resistance element is a precisely controlled thin film of metal alloy sputtered on to a high purity ceramic core, protected by a moisture-resistant, high dielectric strength coating applied so that terminations remain completely clear. This permits a well defined body length, (clean lead to clean lead dimension L). Terminations Material Solder-coated copper wire. Strength 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 Marking Resistors are colour coded with 6 bands. IEC 62 colours are used. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Dimensions (mm) & Weight (g) PCB Min. mounting bend Type L Max D Max f min d nom centres radius Wt.nom Physical Data LD f d *Below 1 ohm 5% preferred
© 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 D · 03.06 Welwyn Components 139 Packaging MFR4P resistors are supplied tape packed ready for loading onto automatic sequencing and insertion machines. The standard taping method and critical dimensions are shown in Figure 1. Component wires will not protrude beyond the outside edge of the tapes. Alternative packaging available by request. Lead Formed resistors can also be supplied. Standard options of Lancet, Radial and Goalpost forming are available by request. f1 f2 Body location f1 – f2 ≤ 1.4 mm Figure 1 Maximum Load at rated power : 1000 hours at 70°C ∆R % 0.5 Shelf life : 12 months at room temperature ∆R % 0.1 Derating Zero at 155°C Short term overload ∆R % 0.5 Climatic ∆R % 0.5 Climatic category 55/125/56 Long term damp heat ∆R % 1 Temperature rapid change ∆R % 0.5 Resistance to solder heat ∆R % 0.5 Vibration and bump ∆R % 0.5 Noise. (in a decade of frequency) µV/V 0.1 Insulation resistance ohms >1G Voltage proof volts 500 min Performance Data Type MFR4P Large ammo pack 5000 Standard Quantities Per Package