Metal Film Resistors
Welwyn ComponentsMFR Series•••Professional grade approved to BSCECC 40101-803 and 019Tolerances down to 0.5%Temperature coefficient down to 50ppm/°CElectrical DataPower rating at 70°CResistance rangeLimiting element voltageTCRResistance tolerancewattsohmsvoltsppm/°C%MFR30.410R - 1M200501MFR40.51R0 - 10M350500.5, 1,2MFR50.751R0 - 1M350≤10:150 >10:100*0.5, 1,2* Note:- Tighter TCR’S are available on professional grade, consult factory for details.Approved CECC 40101 - 019 StylePower rating at 70°CwattsResistance range.ohmsLimiting element voltagevoltsTCRppm/°CResistance tolerance%FZFX0.250.251 to 1M1 to 1M2502501002505.1 to 9.1 : 2005.1 to 9.1 : 5001,21,2BC0.12510 to 1M200500.5, 1, 2BK0.12510 to 1M2001000.5, 1, 2EZ0.510 to 1M03501001,2CC0.2510 to 1M250500.5, 1, 2EX0.510 to 1M3502501,2CK0.2510 to 1M2501000.5, 1, 2Approved CECC 40101 - 803 StylePower rating at 70°CwattsResistance range.ohmsLimiting element voltagevoltsTCRppm/°CResistance tolerance%Standard valuesThermal impedanceAmbient temperature rangeProduct grades availableE24, E96 preferred°C/watt°C150commercial140-55 to 155commercial, professional112Physical DataDimensions (mm) &Weight (g)TypeMFR3MFR4MFR5ProfessionalCommercialProfessionalCommercialProfessionalCommercialL max3.53.76.26.89.010.0D max1.82.02.53.03.63.7F min22.422.421.021.019.619.6d nom0.50.450.60.550.80.6PCBmountcentresMinbendradiusWt.nom7.67.610.210.212.712.70.50.50.60.61.20.60.10.10.30.30.50.5dDLfGeneral 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.
A subsidiary of TTelectronics plcIssue D · 05.07
© 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
135元器件交易网www.cecb2b.com
Metal Film Resistors
MFR Series
Welwyn Components
Performance Data - Type MFR 3CECC 40101-019RequirementsLoad at commercial rating :1000 hours at 70°CLoad at CECC rating:1000 hours at 70°CShelf life :12 months at room temperatureDeratingShort term overloadClimaticClimatic categoryLong term damp heatTemperature rapid changeResistance to solder heatVibration and bumpNoise. (in a decade of frequency)Insulation resistanceVoltage proofPulse handling∆R %∆R %∆R %∆R %∆R %∆R %∆R %∆R %∆R %µV/Vohmsvolts2Not Specifiedzero at 155°C0.5255/125/5620.50.50.5Not specified>1G350 minActual PerformanceMaximumTypical0.8See Graph 10.5See Graph 10.10.070.250.50.50.250.250.10.1>1G400 minData available upon request0.030.20.30.050.020.010.07>1G400 minGraph 1 – Load for 1000 hours at 70°C: maximum changesPerformance Data - Type MFR 4CECC 40101-019RequirementsLoad at commercial rating : 1000 hours at 70°CLoad at CECC rating: 1000 hours at 70°CShelf life : 12 months at room temperatureDeratingShort term overloadClimaticClimatic categoryLong term damp heatTemperature rapid changeResistance to solder heatVibration and bumpNoise. (in a decade of frequency)Insulation resistanceVoltage proofPulse handling∆R %∆R %∆R %∆R %∆R %∆R %∆R %∆R %∆R %µV/Vohmsvolts2Not specifiedzero at 155°C0.5255/125/5620.50.50.5Not Specified>1G500 min1Not SpecifiedCECC 40101-803RequirementsActual PerformanceMaximumTypical0.80.50.1See Graph 2See Graph 20.070.010.20.30.040.070.010.1>1G500 minzero at 155°C0.250.2510.555/125/5610.50.250.250.250.250.250.1Not Specified0.1>1G>1G400 min500 minData available upon requestGraph 2 – Load for 1000 hours at 70°C: maximum changes© Welwyn Components LimitedBedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0)1670 822181 · Facsimile: +44 (0)1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
136
Issue D · 05.07
元器件交易网www.cecb2b.com
Metal Film Resistors
MFR Series
Welwyn Components
Performance Data - Type MFR 5CECC 40101-019RequirementsLoad at commercial rating : 1000 hours at 70°CLoad at CECC rating: 1000 hours at 70°CShelf life : 12 months at room temperatureDeratingShort term overloadClimaticClimatic categoryLong term damp heatTemperature rapid changeResistance to solder heatVibration and bumpNoise. (in a decade of frequency)Insulation resistanceVoltage proofPulse handling∆R %∆R %∆R %∆R %µV/Vohmsvolts∆R %∆R %∆R %∆R %∆R %2Not specifiedzero at 155°C0.5255/125/5620.50.50.5Not Specified>1G700 min1Not Specifiedzero at 155°C0.25155/125/5610.250.250.25Not Specified>1G500 min0.50.250.250.10.1>1G700 min0.30.040.070.010.07>1G700 min0.250.50.010.2CECC 40101-803RequirementsActual PerformanceMaximumTypical0.90.50.1See Graph 3See Graph 30.07Data available upon requestGraph 3 – Load for 1000 hours at 70°C: maximum changesPackagingAll MFR resistors are supplied tape packed ready for loadingon to automatic sequencing and insertion machines.Component wires will not protrude beyond the outside edgeof the tapes.Alternative packaging available by request.ConstructionThe resistance element is a precisely controlled thin film ofmetal alloy sputtered on to a high purity ceramic core,protected by a moisture-resistant, high dielectric strengthcoating applied so that terminations remain completely clear.TerminationsMaterialHot tin dipped copper wireThe terminations meet the requirements ofIEC 68.2.21Strength5f1652f26f1 – f2≤ 1.4 mmSolderabilityThe terminations meet the requirements ofIEC 115-1, Clause 4.17.3.2Marking0.5% and 1% tolerance resistors are colour coded with 5bands, 2% tolerance has 4. IEC 62 colours are used.Lead Formed resistors can also be supplied. Standard optionsof Lancet, Radial and Goalpost forming are available.Solvent ResistanceThe body protection and marking are resistant to all normalindustrial cleaning solvents suitable for printed circuits.© Welwyn Components LimitedBedlington, 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 · 05.07
137
元器件交易网www.cecb2b.com
Metal Film Resistors
MFR Series
Ordering Procedure
Example: Professional grade MFR4 at 4.7 kilohms and 1% tolerance in ammo pack box of 5000 pieces -
MFR4 - 4K7 F ITypeValue (use IEC62 code)Tolerance (use IEC62 code)DFG0.5%1%2%Packing / GradeCMFR3, MFR4AmmoMFR5MFR4MFR55000/box2500/box5000/box2500/boxCECC release is not available for commercial gradeCECC release is optionally available for professional grade *I* For CECC released product state on order the CECC number and style. Example: MFR4-4K7FI CECC40101-019 FZ
© 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 . 05.07
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