Power Metal Resistors Power Metal Welwyn Components Film Resistors Welwyn Components Film Resistors Power Metal Film Resistors MF-S Series Small size for power rating MF-S Series MF-S Series Range of 4 sizes: 0.5 watt to 3 watt at 70C Small size for power rating Flameproof protection RangeSmall siz ofe f or4 sizes:power 0.5rating watt to 3 watt at 70C Range of 4 sizes: 0.5 watt to 3 watt at 70C Flameproof protection Flameproof protection AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3) Electrical Data MF1/2S MF1S MF2S MF3S Electrical Data Power rating at 70 C watts 0.5 1.0 2.0 3.0 MF1/2S MF1S MF2S MF3S 0R1 1M Resistance range ohms Power rating at 70 C watts 0.5 1.0 2.0 3.0 Limiting element voltage volts 350 0R1 1M Resistance range ohms TCR ppm/ C < 10 :350 10 :150 Limiting element voltage volts 350 Isolation voltage volts 500 700 TCR ppm/ C < 10 :350 10 :150 < Resistance tolerance % 1 : 5 >1 : 1, 2, 5 Isolation voltage volts 500 700 Standard values E24 preferred < Resistance tolerance % 1 : 5 >1 : 1, 2, 5 140 110 80 60 Thermal impedance C/watt Standard values E24 preferred Ambient temperature range C -55 to 155 140 110 80 60 Thermal impedance C/watt Ambient temperature range C -55 to 155 Physical Data Dimensions (mm) & Weight (g) Physical Data PCB Min. Dimensions (mm) & Weight (g) mounting bend d L D PCB Min. Type L Mx D Max f min +0.01 -0.06d nom centres radius Wt.nom 6.2 2.5 mounting bend MF1/2S 10.2 21.0 0.6 1.02 0.6 0.3 +0 -0.5 +0 -0.25 d d L D D Type L Mx D Max f min +0.01 -0.06d nom centres radius Wt.nom 9.0 3.6 MF1S L 19.6 0.8 12.7 1.2 0.5 f +0 -0.6 +0.5 -0 6.2 2.5 MF1/2S 4.2 10.2 12.5 21.0 0.6 1.02 0.6 0.3 +0 -0.5MF2S +0 -0.25 d 17.8 0.8 18.4 1.2 0.9 +0.8 -0 +0 -2.1 D 9.0 3.6 MF1S 19.65.3 0.8 12.7 1.2 0.5 L f 14.5 +0 -0.6 +0.5 -0 MF3S 23.8 0.8 20.3 1.2 1.1 +0 -0.4 +0.6 -0 4.2 12.5 MF2S 17.8 0.8 18.4 1.2 0.9 +0.8 -0 +0 -2.1 5.3 14.5 MF3S 23.8 0.8 20.3 1.2 1.1 +0 -0.4 +0.6 -0 General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. General Note TT electronics plc General Note BI Technologies IRC Welwyn 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 is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue C 03.0801.06 All information is subject to TT Electronics own data and is considered accurate at time of going to print. TT electronics plc www.ttelectronics.com/resistors Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK 147 Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue C 03.0801.06 TT Electronics plc 06.18 147 < <Power Metal Flameproof Power Film Resistors Metal Film Resistors MF-S Series Welwyn Components MF-S Series Construction Marking The resistance element is a precisely controlled thin film of MF Series resistors are colour coded with 5 bands for 1% metal alloy on a high purity ceramic core, protected by a tolerance or 4 bands for other tolerances. IEC 62 colours cement coating applied so that terminations remain are used. completely clear. Solvent Resistance This permits a well defined body length, (clean lead to clean The body protection and marking are resistant to all normal lead dimension L). industrial cleaning solvents suitable for printed circuits. Terminations Flammability Material Solder-coated copper wire. The resistors will not burn or emit incandescent particles under any condition of applied temperature or power Strength The terminations meet the requirements of overload. IEC 68.2.21 Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 Performance Data Maximum Load: 1000 hours at 70C R % 5 Shelf life: 12 months at room temperature R % 1 Derating from rated power at 70C 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 Packaging Application Notes The preferred method of packaging is taped and ammo 1. If the resistors are to dissipate full rate power, it is packed, see figure 1 for critical dimensions. recommended that the terminations should not be soldered closer than 4mm from the body. Alternative packaging is available by special request. 2. Due to operating temperature limitations imposed by some Figure 1 pcb materials, derating may be necessary. An estimate of the temperature rise to be expected can be calculated c using the thermal impedance figures given under Electrical Data. 3. Lead Formed resistors can also be supplied. Standard f f 1 2 options of Lancet, Radial and Goalpost forming are shown b 6 6 in lead Form Information section. Body location f f 1.4 mm 1 2 Type b c 1 MF /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 BI Technologies IRC Welwyn 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. www.ttelectronics.com/resistors Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK T TT Electronics plcelephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue C 01.0603.08 06.18 148