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1、Multi-layer Ceramic Capacitor (MLCC) general IntroductionW.Z. Huang WTC M 0928-888-6251. MLCC construction and characteristic1. MLCC construction and characteristic2. MLCC process flow3. MLCC Parts Nr. (P/N) 晶片電容微粒電容貼片電容The different names for MLCCMulti-layer Ceramic CapacitorChip capacitor多層陶瓷電容積層陶
2、瓷電容Construction of MLCCTerminationelectrodeCeramic dielectricC = k : Dielectric constantA : Area of overlapping electrodesN : Number of dielectric layerst : Thickness of dielectricf : Conversion factor2.What is a Capacitor ? k * A * (N) f * t The principle of capacitance designingCapacitance = e ee
3、e0 0A x ( Ne-1 )De e0 0 = 8.8419 10-12 F/mA = Area, (LeffxWeff)Ne = Number of electrodeD = Distance of electrodee e = Permittivity of ceramicUnit : F (farad, from Faraday)Different design patterns of MLCCFixed patternFixed patternVariable patternVariable patternFloating patternFloating pattern(1)(1)
4、(2)(2)(3)(3)(4)(4)(5)(5)(6)(6)(1):(1): Standard(2):(2): For inner stress reduction(3):(3): For high voltage capability increasing(4), (5), (6):(4), (5), (6): For capacitance tuningMLCC material and constructionThe classification of ceramic material X7R, X5R, Y5V, Z5U1 1Temperature CompensationNP0 (C
5、0G), N750 (U2J)2 2High Dielectric ConstantClassTC featureLiner function of cap. with temp.Non-liner function of cap. with temp.Typical productSymbols of temperature coefficients (EIA) for Class IC 0 GSignificant figure of temp. coeff. of cap. (ppm/ C)C C = 0B B = 0.3L L = 0.8A A = 0.9M M = 1.0P P =
6、1.5R R = 2.2S S = 3.3T T = 4.7V V = 5.6U U = 7.5Multiplier applied to significant figure 0 0 = -11 1 = -102 2 = -1003 3 = -10004 4 = -100005 5 = +16 6 = +107 7 = +1008 8 = +10009 9 = +10000Tolerance of temp. coeff. (ppm) G G = 30H H = 60J J = 120K K = 250L L = 500M M = 1000N N = 2500 Ex. :C0G = NP0,
7、.TC.= 0(-1)30 ppm C: 0 N: Negative 0: -1 P: Positive G: 30 ppm 0: 0Class 1 :Ex. : C0G = NP0,T.C.= 0(-1)30 ppm C: 0N: Negative 0: -1P: Positive G: 30 ppm0: 0Symbols of Temperature CoefficientsClass 2 :Ex. : X7R X5R ,or(B) Y5V ,or (F) Z5U X : -55C X : -55C ,(-25 C) Y : -30 C ,(-25 C) Z : +10 C 7 : +12
8、5 C 5 : +85 C ,(+85 C ) 5 : +85 C ,(+85 C ) 5 : +85 C R : 15% R : 15% ,(10%) V : +22 to -82% ,(+30 to -80% ) U : +22 to -56%Symbols of Temperature CoefficientsTemperature coefficient of class I MLCCSymbols of temperature characteristics (EIA) for Class IIX 7 RLow temp. ( C)Z Z = +10Y Y = -30X X = -5
9、5High temp. ( C) 2 2 = +454 4 = +655 5 = +856 6 = +1057 7 = +1258 8 = +1509 9 = +200Max. cap. change over temp. range (%) A A = 1.0B B = 1.5C C = 2.2D D = 3.3E E = 4.7F F = 7.5P P = 10R R = 15S S = 22T T = +22 to -33U U = +22 to -56V V = +22 to -82Ex. : X7R X5R ,or(B) Y5V ,or (F) Z5U X : -55C X : -5
10、5C ,(-25 C) Y : -30 C ,(-25 C) Z : +10 C 7 : +125 C 5 : +85 C ,(+85 C ) 5 : +85 C ,(+85 C ) 5 : +85 C R : 15% R : 15% ,(10%) V : +22 to -82% ,(+30 to -80% ) U : +22 to -56%Temperature coefficient/characteristic of MLCCMLCC process flow 3.Walsin MLCC Introduction WTC Part No. 0805 B 104 K 500 N T (1)
11、 (2) (3) (4) (5) (6) (7) (1) Size Code (2) Dielectric (3) Capacitance (4) Tolerance (5) Voltage (6) Termination (7) PackagingWalsin MLCC Introduction(1) Size CodeL * W ( in inches ): 0805 = 0.08 inch * 0.05 inch = ( 0.08 * 25.4 mm ) * ( 0.05 * 25.4 mm ) = 2.0 mm * 1.2 mm = 2012inches mm0201 06030402
12、 1005 0603 16080805 20121206 32161210 32251808 45201812 4532 WLWalsin MLCC Introduction(2) Dielectric Walsin MLCC Introduction(3) Capacitance-1Two significant digits followed by no. of zeros: 473 = 47 *103 pF = 47nF = 0.047uFFor values below 10 pf, use “R” in place of decimal point : 4R7 = 4.7 pFC =
13、 Q / V = Coulomb/Voltage = FARADQ(electric charge) = C(capacitance value)*V(applied voltage)I = dQ/dt = C*dV/dt(The value of Capacitance is defined as one FARAD when the Voltage across the capacitor is one Volt.,and a charging current of one Ampere flows for one second.) pico-farad (pf) = 10-12 fara
14、d nano-farad (nf) = 10-9 farad micro-farad(uf) = 10-6 faradWalsin MLCC Introduction(3) Capacitance-2Walsin MLCC Introduction(4) Tolerance Walsin MLCC Introduction(5) VoltageTwo significant digits followed by no. of zeros.500 = 50 * 100 VLow voltage : 6.3V,10V,16 V, 25 V, 50 VHigh voltage: 100V,200/2
15、50V,500V,1KV,2KV,3KVWalsin MLCC Introduction(6) TerminationN : Ag/Ni/SnPb (Noble metal)B : Cu/Ni/SnPb (Base metal)L : Ag/Ni/Sn (Noble metal)C : Cu/Ni/Sn (Base metal)Walsin MLCC Introduction(7) Packaging NO CODE : Bulk T : Taping on Reel C : Bulk CaseStandard Packing QuantityV=IjL=0電感在直流電路如同導線I=jCV=0
16、電容阻隔直流I=V/R直流特性I=V/XL=V/jL電流落後電壓90I=V/Xc=jCV電壓落後電流90I=V/R電流與電壓同相歐姆定律電感抗(inductive reactance)XL = jL電容抗(capacitive reactance)Xc=1/jC電阻(resistance)阻止電流能力反抗電流變化,儲存磁能儲存電能 阻止電流電路特性電感器電感器(inductor)電電容器容器(capacitor)電阻器電阻器(resistor)Dissipation Factor:Xc( Capacitive Reactance) = 1 2f CDF(%) = Tan = ESR100XcESRxcDissipation Factor Q : Quality factor(Tan)Equivalent Circuit of MLCCLs: Equivalent series inductanceRs: Equivalent series resistance Rp: Insulation resistance: Self-resonant frequency (SRF):
