MFP WELWYN | Alldatasheet
Document overview
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Technical content
- Smallest size for power rating
- Resistance range 0.1 ohms to 1M ohms
- Flameproof protection MFP1 MFP2 Power rating at 70°C watts <1 Ω: 0.7 >=1 Ω: 1.0 2 Resistance range ohms 0R1 – 1M 1R0 – 1M Limiting element voltage volts 350 TCR ppm/°C < 1 Ω: 300 1 Ω - 9.1 Ω: 200 ≥10 Ω: 50 100 Resistance tolerance % 1, 2, 5 Standard values E24 preferred Thermal impedance °C/watt 120 82 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 143 Marking Resistors are colour coded with 4 or 5 bands depending on value and tolerance. IEC 62 colours are used. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Flammability The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload. Construction The resistance element is a precisely controlled thin film of metal alloy on a high purity ceramic core, protected by a cement 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 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
© 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 144 Application Notes 1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. 2. Due to operating temperature limitations imposed by some pcb materials, derating may be necessary. An estimate of the temperature rise to be expected can be calculated using the thermal impedance figures given under Electrical Data. 3. MFP resistors an also be supplied pre-formed. b f1 f2 Body location f1 – f2 ≤ 1.4 mm Figure 1 Packaging MFP resistors are normally 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 shown in lead Form Information section. Maximum Load at rated power : 1000 hours at 70°C ∆R % 5 Shelf life : 12 months at room temperature ∆R % 2 Derating from rated power at 70°C ∆R % zero at 155°C Climatic ∆R % 3 Climatic category 50/155/56 Temperature rapid change ∆R % 0.5 Resistance to solder heat ∆R % 0.5 Voltage proof volts 500 min Performance Data Type MFP1 MFP2 Ammo pack 5000 2000 Standard Quantities Per Package Type MFP1 MFP2 b (mm) 52 68