脚距（PCM）为 7.5 - 37.5 mm 的金属膜电容器这类 WIMA 薄膜/箔片电容器适合于高要求场合使用，具有很宽的电容和电压范围，可采用聚酯、聚丙烯或混合膜绝缘介质。金属化电容器是在塑料薄膜上涂敷很薄的一层金属涂层作为电极而成的。通过这种方法，可以生产出具有很高的电容/体积比的电容器。WIMA MKS 4 具有 220 μF 的电容和 50 VDC 的电压，是 WIMA 产品范围中额定电容量最高的电容器。金属化电容器的另一个特性在于它的自修复能力。一旦发生击穿情况时，涂敷金属层将会蒸发。损伤区域会被绝缘，电容器即可继续正常工作。高要求场合使用的 WIMA 电容器的电容值为 1000 pF 至 220 μF，额定电压为 50 VDC 至 2000 VDC。按照客户要求，我们可以提供大封装壳尺寸的 4 引线型电容器。另外，我们还可以应客户需要生产带端接板的电容器。这种结构形式的优点除了可以改善元件在电路板上的机械稳定性之外，还具有优良的电接触可靠性。 Metallized Polypropylene (PP) Capacitors in PCM 7.5 mm to 37.5 mm Special FeaturesHigh volume/capacitance ratioSelf-healingVery low dissipation factorNegative capacitance changeversus temperatureVery low dielectric absorptionAccording to RoHS 2002/95/ECTypical ApplicationsFor high frequency applications e.g.Sample and holdTimingOscillating circuitsHigh frequency coupling anddecouplingConstructionDielectric:Polypropylene (PP) filmCapacitor electrodes:Vacuum-depositedInternal construction:Encapsulation:Solvent-resistant, flame-retardant plastic case with epoxy resin seal, UL 94 V-0Terminations:Tinned wireMarking:Colour: Red. Marking: Black. Epoxy resin seal: Red.Electrical DataCapacitance range:0.01 μF to 33 μF(E12-values on request)Rated voltages:100VDC, 250VDC, 400VDC, 630VDC, 1000VDCCapacitance tolerances:±20%, ±10%, ±5%Operating temperature range:-55°C to +100°CClimatic test category:55/100/56 in accordance with IECInsulation resistanceat +20°C:C<0.33 μF:>1 x 105M(mean value: 5 x 105M)C > 0.33 μF:>30000 sec (MxμF)(mean value: 100000 sec)Measuring voltage: 100V/1 min.Dissipation factorsat +20°C:tan<10 x 10-4at1kHzTest specifications:In accordance with IEC 60384-16 and EN 131200Test voltage:1.6 Ur, 2 secDielectric absorption:0.05%Voltage derating:A voltage derating factor of 1.35% per K must be applied from +85°C for DC voltages and from +75°C for AC voltages.Reliability:Operational life > 300000 hoursFailure rate < 2 fit (0.5 x Ur and40°C)Graphs:Soldering:Maximum pulse rise time:for pulses equal to the rated voltageCapacitancepF/μFmax. pulse rise time V/μsec at TA< 40°C100VDC250VDC400VDC630VDC1000VDC0.01 ...0.0220.033...0.0680.1...0.220.33...0.681.0...2.23.3...4.76.8...1015...3345025015010075604035450250150100100100505045030020015010010060-50035025020015012085-550400300200150--- Mechanical Tests PackingPull test on leads:d<0.8 ?: 10 N in direction of leadsd > 0.8 ?: 20 N in direction of leadsaccording to IEC 60068-2-21Vibration:6 hours at 10...2000Hz and 0.75mm displacement amplitude or 10g in accordance with IEC 60068-2-6Low air density:1kPa = 10 mbar in accordance with IEC 60068-2-13Bump test:4000 bumps at 390 m/sec2in accordance with IEC 60068-2-29 Available taped and reeled up to and including case size 15x26x31.5 / PCM 27.5mm.Detailed taping information:Example for ordering / Part number: