Power Metal Resistors Power FilmMetal Resistors Film Resistors Power Metal Film Resistors Welwyn Components Make Possible Welwyn Components MF-S Series MF-S SeriesSmall size for power rating Range of 4 sizes: 0.5 watt to 3 watt at 70˚C MF-S Series Small size for power rating Flameproof protection Small size power 0.5 rating Range offor 4 sizes: watt to 3 watt at 70˚C Range of 4 sizes: 0.5 watt to 3 watt at 70°C Flameproof protection Flameproof protection All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2) Electrical Data Electrical Data MF1/2S Power rating at 70° C Resistance range Power rating Limiting at 70° Celement voltage watts Resistance range TCR ohms Limiting element voltage Isolation voltage TCR Resistance tolerance watts MF1/2S ohms 0.5 volts volts ppm/° C Isolation voltage Standard values Resistance tolerance Thermal impedance Standard values Ambient temperature range Thermal impedance % volts % PCB MF2S 0R1 – 1M 2.0 350 MF3S 2.0 MF3S 3.0 3.0 700 < >1Ω : 1, 2, 5 80 140 1Ω : 5 110 E24 preferred -55 to 155 110 80 60 °C 140 60 -55 to 155 °C Physical Data Dimensions Physical Data(mm) & Weight (g) 1.0 1.0 ° C/watt ° C/watt Ambient temperature range 0.5 MF1S MF2S 0R1 – 1M < 10Ω :150 < 10Ω :350 350 500 < < 10Ω :350 < 1Ω10Ω : 5 :150 >1Ω : 1, 2, 5 500 E24 preferred 700 ppm/° C volts MF1S Min. Dimensions (mm) & Weight (g) Type MF1/2S MF1S MF2S MF3S mounting bend d PCB D +0.01 -0.06 Min. Type L LMx D Max f min d nom centres radius 6.2 2.5 mounting bend 10.2 MF1/2S +0 -0.5 0.6 1.02 0.6 +0 -0.25 d 21.0 D 9.0 f min3.6 +0.01 -0.06 centres L LMF1S Mx D Max d nom radius Wt.nom 19.6 0.8 12.7 1.2 +0 -0.6 +0.5 -0 6.2 2.5 10.2 4.2 21.0 0.6 0.6 0.31.2 12.5 +0 MF2S -0.5 +0 -0.25 17.8 1.02 0.8 18.4 9.0 +0MF3S -0.6 12.5 +0 -2.1 14.5 +0.6 -0 +0 -2.1 3.6 14.5 +0.5 -0 4.2+0.6 -0 +0.8 -0 5.3 +0 -0.4 +0.8 -0 19.65.3 17.8 0.823.8 0.8 12.70.8 18.4 1.220.3 1.2 0.51.2 0.9 23.8 0.8 20.3 1.2 1.1 +0 -0.4 Wt.nom 0.3 d D 0.5 0.9 d D 1.1 L L f f 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. GeneralNote Note General Welwyn Components reserves the right to make changes in ·product specification without notice or liability. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics reserves the right to make changes in product specification without notice or liability. All information isTelephone: subject to +44 Welwyn’s own822181 data and is considered accurate at time of going [email protected] to print. (0) 1670 · Facsimile: +44 (0) 1670 829465 · Email: · Website: www.welwyn-tt.com All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) plc 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com © TT Electronics A subsidiary of TT electronics plc A subsidiary of Issue C · 03.08 01.06 TT electronics plc www.ttelectronicsresistors.com Issue C · 03.08 01.06 07.14 147 Power Metal Power Flameproof Film Resistors Metal Film Resistors Make Possible Welwyn Components MF-S Series MF-S Series Construction Marking 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. MF Series resistors are colour coded with 5 bands for 1% tolerance or 4 bands for other tolerances. IEC 62 colours are used. Solvent Resistance This permits a well defined body length, (clean lead to clean lead dimension L). The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Terminations Flammability Material Solder-coated copper wire. Strength The terminations meet the requirements of IEC 68.2.21 The resistors will not burn or emit incandescent particles under any condition of applied temperature or power overload. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 Performance Data Maximum Load: 1000 hours at 70˚C R% Shelf life: 12 months at room temperature R% 5 1 Derating from rated power at 70˚C R% zero at 155˚ C Climatic R% 1 Climatic category 40/125/56 Temperature rapid change R% 0.5 Resistance to solder heat R% 0.5 Application Notes 1. If the resistors are to dissipate full rate 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. Packaging The preferred method of packaging is taped and ammo packed, see figure 1 for critical dimensions. Alternative packaging is available by special request. Figure 1 c 3. Lead Formed resistors can also be supplied. Standard options of Lancet, Radial and Goalpost forming are shown in lead Form Information section. f1 f2 b 6 Body location f Type 6 1 –f2 1.4 mm b c MF1/2S 52 2 5 0.5 MF1S 52 2 5 0.5 MF2S 52 2 5 0.5 MF3S 67 2 10 0.5 General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 © TT Electronics plc 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com 148 www.ttelectronicsresistors.com 03.08 Issue C · 01.06 07.14 Flameproof Power Metal Power Film Resistors Metal Film Resistors Make Possible Welwyn Components MF-S MF-SSeries Series Ordering Procedure Example: MF3S at 3.3 kilohms and 5% tolerance in ammo pack box of 1000 pieces – MF3S–3K3JI Type Value (use IEC62 code) Tolerance (use IEC62 code) F G 1% 2% J Packing I Ammo 5% MF1/2S MF1S MF2S MF3S 5000/box 2500/box 1500/box 1000/box Standard General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) plc 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com © TT Electronics 148 www.ttelectronicsresistors.com 03.08 Issue C · 01.06 07.14