MLCC-贴片电容介绍

1、Multi-layer Ceramic Capacitor (MLCC) general IntroductionW.Z. Huang WTC Marketingwz 0928-888-6251. 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瓷電容Construction of MLCCTermin

2、ationelectrodeCeramic 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 e0A x ( Ne-1 )De0 = 8.841910-12

3、F/mA = Area, (LeffxWeff)Ne = Number of electrodeD = Distance of electrodee = Permittivity of ceramicUnit : F (farad, from Faraday)Different design patterns of MLCCFixed patternVariable patternFloating pattern(1)(2)(3)(4)(5)(6)(1): Standard(2): For inner stress reduction(3): For high voltage capabili

4、ty increasing(4), (5), (6): For capacitance tuningMLCC material and constructionThe classification of ceramic material X7R, X5R, Y5V, Z5U1Temperature CompensationNP0 (C0G), N750 (U2J)2High Dielectric ConstantClassTC featureLiner function of cap. with temp.Non-liner function of cap. with temp.Typical

5、 productSymbols of temperature coefficients (EIA) for Class IC 0 GSignificant figure of temp. coeff. of cap. (ppm/C)C = 0B = 0.3L = 0.8A = 0.9M = 1.0P = 1.5R = 2.2S = 3.3T = 4.7V = 5.6U = 7.5Multiplier applied to significant figure 0 = -11 = -102 = -1003 = -10004 = -100005 = +16 = +107 = +1008 = +10

6、009 = +10000Tolerance of temp. coeff. (ppm) G = 30H = 60J = 120K = 250L = 500M = 1000N = 2500 Ex. :C0G = NP0,.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 CoefficientsC

7、lass 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 : +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%Symbols of Temperature CoefficientsTemperature coefficient of class

8、I MLCCSymbols of temperature characteristics (EIA) for Class IIX 7 RLow temp. (C)Z = +10Y = -30X = -55High temp. (C) 2 = +454 = +655 = +856 = +1057 = +1258 = +1509 = +200Max. cap. change over temp. range (%) A = 1.0B = 1.5C = 2.2D = 3.3E = 4.7F = 7.5P = 10R = 15S = 22T = +22 to -33U = +22 to -56V =

9、+22 to -82Ex. : X7R X5R ,or(B) Y5V ,or (F) Z5U X : -55C X : -55C ,(-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.

10、Walsin MLCC Introduction WTC Part No.0805 B 104 K 500 N T (1) (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.

11、05 * 25.4 mm ) = 2.0 mm * 1.2 mm = 2012inches mm0201 06030402 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 belo

12、w 10 pf, use “R” in place of decimal point : 4R7 = 4.7 pFC = 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 on

13、e Ampere flows for one second.) pico-farad (pf) = 10-12 farad 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

14、 voltage : 6.3V,10V,16 V, 25 V, 50 VHigh voltage: 100V,200/250V,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 :

15、 Bulk CaseStandard Packing QuantityV=IjL=0電感在直流電路如同導線I=jCV=0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(inductor)電容器(capacitor)電阻器(resistor)Dissipation Factor:Xc( Capacitive