Power PowerMetal Metal Power Metal Film FilmResistors Resistors Film Resistors Welwyn Components Welwyn Components MF-S Series MF-SMF-S SeriesSeries Small size for power rating Small for power rating Small size size for power rating Range of 4 sizes: 0.5 watt to 3 watt at 70C Range 4 sizes: 0.5 watt 3 watt at 70C Range of 4 of sizes: 0.5 watt to 3 to watt at 70C Flameproof protection Flameproof protection Flameproof protection * * * Electrical Data Electrical Data Power rating at 70 C Power rating at 70 C Resistance range Resistance range Limiting element voltage Limiting element voltage TCR TCR Isolation voltage Isolation voltage Resistance tolerance Resistance tolerance Standard values Standard values Thermal impedance Thermal impedance Ambient temperature range Ambient temperature range MF1/2S MF1S MF2S MF3S MF1/2S MF1S MF2S MF3S watts 0.5 1.0 2.0 3.0 watts 0.5 1.0 2.0 3.0 0R1 - 1M ohms 0R1 - 1M ohms volts 350 volts 350 < 10 :150 ppm/ C < 10 :350 < 10 :150 ppm/ C < 10 :350 700 500 volts 700 500 volts < 1 : 5 % >1 : 1, 2, 5 < 1 : 5 % >1 : 1, 2, 5 E24 preferred E24 preferred 140 110 80 60 C/watt 140 110 80 60 C/watt -55 to 155 C -55 to 155 C Physical Data Physical Data Dimensions (mm) & Weight (g) Dimensions (mm) & Weight (g) PCB Min. PCB Min. mounting bend mounting bend d D +0.01 -0.06 dcentres Type L LMx D Max f min d nom radius Wt.nom D +0.01 -0.06 centres Type L LMx D Max f min d nom radius Wt.nom 6.2 2.5 10.2 MF1/2S +0 -0.5 6.2+0 -0.25 2.5 21.0 0.6 1.02 0.6 0.3 10.2 MF1/2S +0 -0.5 21.0 0.6 1.02 0.6 0.3 9.0 3.6 +0 -0.25 MF1S 19.6 0.8 12.7 1.2 0.5 +0.5 -0 3.6 MF1S+0 -0.6 +09.0-0.6 19.6 0.8 12.7 1.2 0.5 4.2 +0.5 -0 12.5 MF2S 0.8 18.4 1.2 0.9 +0 -2.1 12.5+0.8 -0 4.2 17.8 MF2S 17.8 0.8 18.4 1.2 0.9 +0.8 -0 14.5 +0 -2.15.3 MF3S 20.3 1.2 1.1 +0.6 -0 14.5+0 -0.4 5.3 23.8 23.8 0.8 MF3S 0.8 20.3 1.2 1.1 +0 -0.4 +0.6 -0 d D d D L L f f General Note Note WelwynGeneral Components reserves the right to make changes in product specification without notice or liability. WelwynisComponents reserves own the right make changes inaccurate productatspecification without notice or liability. All information subject to Welwyn's data to and is considered time of going to print. All Note information is subject to Welwyn's own data and is considered accurate at time of going to print. General TT the right toLimited make changes in product specification without noticeUK or liability. (c) electronics Welwynreserves Components * Bedlington, Northumberland NE22 7AA, (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44is(0) 1670 822181 * Facsimile: +44 (0)* and 1670 829465 * Email: info@welwyn-tt.com www.welwyn-tt.com All information subject to TT electronics' own data is considered accurate at time of going to* Website: print. A subsidiary of A subsidiary of TT electronics plc TT electronics plc Issue C * 03.08 01.06 Issue C * 03.08 01.06 Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website:www.bitechnologies.com www.welwyn-tt.com www.irctt.com www.welwyn-tt.com 147 (c) TT electronics plc 01.13 147 Power Metal Power Flameproof Film Resistors Metal Film Resistors 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 70C R% Shelf life: 12 months at room temperature R% 5 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 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. www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 (c) TT electronics plc822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 148 03.08 Issue C * 01.06 01.13 Flameproof Power Metal Power Film Resistors Metal Film Resistors Welwyn Components MF-S MF-S Series 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. www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK 03.08 Issue C * 01.06 Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com (c) TT electronics plc 148 01.13