AVX Multilayer Ceramic Feedthru Chip Capacitors And Arrays

Transcription

1 A KYOCERA GROUP COMPANY AVX Multilayer Ceramic Feedthru Chip Capacitors And Arrays

2 Feedthru 85/6 Capacitors Table of Contents WF/WF Series - 85 & 6 Feedthru Chips WH/WH Series - High Current Feedthru Capacitors WF/WF Series - Element 6/85 Feedthru Array WF/WF/WF Series - Applications WH/WH Series - Applications WF/WF/WF Series - Application Notes

3 Feedthru 85/6 Capacitors WF/WF Series GENERAL DESCRIPTION Available in both a standard 85 and 6 size, AVX s line of feedthru capacitors are ideal choices for EMI suppression, broadband I/O filtering, or Vcc power line conditioning. The unique construction of a feedthru capacitor provides low parallel inductance and offers excellent decoupling capability for all high di/dt environments and provides significant noise reduction in digital circuits to <5 GHz. A large range of capacitor values are available in either NP or X7R ceramic dielectrics. AVX FeedThru filters are AEC Q qualified. High reliability screening options are available for spacecraft designs. WF Series 85 SIGNAL LINE - INPUT WF Series 6 OUTPUT CAPACITOR VALUES Part Number Size Voltage Dielectric Capacitance WFA 8ATxx 85 V NP pf WFA 7 8ATxx 85 V NP 7pF WFA 8ATxx 85 V NP pf WFA 8ATxx 85 V NP pf WFA 7 8ATxx 85 V NP 7pF WF5C 8ATxx 85 5V X7R pf WF5C 8ATxx 85 5V X7R pf WF5C 7 8ATxx 85 5V X7R 7pF WF5C 8ATxx 85 5V X7R pf WF5C 8ATxx 85 5V X7R pf WF5C 7 8ATxx 85 5V X7R 7pF WFA 8ATxx 6 V NP pf WFA 7 8ATxx 6 V NP 7pF WFA 8ATxx 6 V NP pf WFA 8ATxx 6 V NP pf WFA 7 8ATxx 6 V NP 7pF WF5C 8ATxx 6 5V X7R pf WF5C 8ATxx 6 5V X7R pf WF5C 7 8ATxx 6 5V X7R 7pF WF5C 8ATxx 6 5V X7R pf WF5C 8ATxx* 6 5V X7R pf WF5C 7 8ATxx 6 5V X7R 7pF PERFORMANCE CHARACTERISTICS NP X7R Capacitance Tolerance +5%, -% +5%, -% Voltage Rating V 5V Current Rating ma ma Insulation Resistance MΩ MΩ DC Resistance <.6Ω <.6Ω Operating Temperature Range -55 to +5 C GROUND HOW TO ORDER W F 5 C 8 A T A Style W = Plated Ni & Sn L = Plated SnPb Size = 85 = 6 Feedthru Number of Elements Voltage** = V 5 = 5V Dielectric A = NP C = X7R *AECQ- Qualified. Contact factory for other values. **Note: NP available in V only and X7R available in 5V only. Capacitance Code Capacitance Tolerance 8 = +5/-% Failure Rate A = Not Applicable = AUTOMOTIVE Termination T = Plated Ni & Sn B = Plated SnPb Packaging Code (Reel Size) = 7" Reel Embossed Tape = " Reel Embossed Tape Quantity Code (Pcs./Reel) F =, A =,,, or,

4 Feedthru 85/6 Capacitors WF/WF Series Common Ground L S X Feedthru Pad C L Feedthru Pad T BL W BW EW DIMENSIONS Common Ground L W T BW BL EW X S 85 MM. ±..5 ±.. Max..6 ± ±.. ±.. ±.5 (in.) (.79 ±.8) (.9 ±.8) (.5 Max.) (.8 ±.) ( ) (. ±.5) (. ±.) (.9 ±.6) 6 MM. ±..6 ±..7 Max..89 ± ±.8.6 ±..6 ±.5 (in.) (.6 ±.8) (.6 ±.8) (.5 Max.) (.5 ±.) ( ) (.5 ±.7) (.6 ±.) (.8 ±.6) T P P S W C L RECOMMENDED SOLDER PAD LAYOUT (TYPICAL DIMENSIONS) T P S W L C 85 MM (in.) (.6) (.) (.) (.5) (.) (.8) 6 MM (in.) (.79) (.7) (.) (.65) (.) (.8) TYPICAL FEEDTHRU CHIP CAP CONNECTION Feedthru Chip Component Model Vcc or Signal In Vcc or Signal Out Physical Layout - A Ground Signal In Signal Out Ground Ground The terminals are connected internally side to side. Left side and right side are connected and front and back are connected internally. For Decoupling, the chip is usually surrounded by four vias, two for Vcc and two for GND. For Signal Filtering, the in and out lines need to be separated on the circuit board. Vcc Physical Layout - B Ground Vcc Ground

5 Feedthru 85/6 Capacitors WF/WF Series PERFORMANCE CHARACTERISTICS S 85 V IMPEDANCE 85 V S () WFA8AT -5 WFA78AT WFA8AT -6 WFA8AT WFA78AT -7.E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) Z (Ohms) WFA8 WFA78 WFA8. WFA8 WFA78..E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) S () S 6 V -5 WFA8 WFA78-6 WFA8 WFA8-7.E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) Z (Ohms) IMPEDANCE 6 V WFA8 WFA78. WFA8 WFA8..E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) S () S 6 5V - WF5C8-5 WF5C78 WF5C8-6 WF5C8 WF5C78-7.E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) Z (Ohms). IMPEDANCE 6 5V WF5C8 WF5C78 WF5C8 WF5C8 WF5C78..E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz)

6 Feedthru 85/6 Capacitors WF/WF Series PERFORMANCE CHARACTERISTICS Component Temperature ( C) NP Current vs. Temperature pf pf 7pf 7pf. 85 X7R Current vs. Temperature Current (A) Component Temperature ( C) pf pf 7pf nf 7nf nf Current (A). 6 NP Current vs. Temperature Component Temperature ( C). pf pf 7pf 7pf pf. 6 X7R Current vs. Temperature Current (A).87.. Component Temperature ( C). pf,pf pf Current (A).87..

7 High Current Feedthru Capacitors WH/WH Series GENERAL DESCRIPTION High current feedthru capacitors are designed as a broadband EMI filter that is specially designed to have high current handling capability. These SMT feedthru filters offer an optimized frequency response with high attenuation across a wide RF spectrum due to optimized parallel and series inductances. These WH/WH feedthru filters can actually replace discrete L/C filter networks. FEATURES Low parallel inductance provides significant noise reduction in circuits with operating frequencies up to 5GHz Broad frequency response with high attenuation High rated current up to A for 85 and up to 5A for 6 Small size 85 and 6 case size Reeling in accordance with EIA-8 MECHANICAL CHARACTERISTICS Available in EIA 85 and 6 cases Plated Tin over Nickel Barrier Packaged in Tape & Reel TYPICAL APPLICATIONS High current power (Vcc) lines PA decoupling DC:DC converters Regulators Power supervisory circuits HOW TO ORDER WH 5 C 7 8 A T A Size & Style WH=85 WH=6 W=Plated Ni & Sb L=Plated SnPb Voltage =5v 5=5v =v Dielectric A=NP C=X7R Capacitance Code Capacitance Tolerance 8=+5/-% M=±% Failure Rate A=Not Applicable Terminations T=Plated Ni & Sn B=Plated SnPb Packaging A=7" Reel pcs A=" Reel pcs PINOUT CONFIGURATION LEAD-FREE COMPATIBLE COMPONENT Ground Signal/Vcc Signal/Vcc Signal/Vcc Ground Ground Ground Signal/Vcc WH 85 Style WH 6 Style 5

8 High Current Feedthru Capacitors WH/WH Series ELECTRICAL PARAMETERS Insulation Resistance MΩ Minimum DC Resistance <.5 Ω Operating Temperature -55C to +5C CAPACITOR VALUES Part Number Size Dielectric Capacitance Tolerance Voltage Current WHC 8AT 85 X7R,pF +5%, -% 5V A WH5C 7 8AT 85 X7R 7,pF +5%, -% 5V A WH5C 8AT 85 X7R,pF +5%, -% 5V A WH5C 8AT 85 X7R,pF +5%, -% 5V A WH5C 8AT 85 X7R,pF +5%, -% 5V A WHA 7 8AT 85 NP 7pF +5%, -% V.5A WHA 8AT 85 NP pf +5%, -% V.5A WHA 8AT 85 NP pf +5%, -% V.5A WHA 7 8AT 85 NP 7pF +5%, -% V.5A WHA 8AT 85 NP pf +5%, -% V.5A WHC 8AT 6 X7R,pF +5%, -% 5V up to 5A WH5C 7 8AT 6 X7R 7,pF +5%, -% 5V up to 5A WH5C 8AT 6 X7R,pF +5%, -% 5V up to A WH5C 8AT 6 X7R,pF +5%, -% 5V up to A WHA 7 8AT 6 NP 7pF +5%, -% V up to A WHA 8AT 6 NP pf +5%, -% V up to A WHA 8AT 6 NP pf +5%, -% V up to A WHA 7 8AT 6 NP 7pF +5%, -% V up to A WHA 8AT 6 NP pf +5%, -% V up to A 6

9 High Current Feedthru Capacitors WH/WH Series PHYSICAL DIMENSIONS AND PAD LAYOUT X L BW P T C T S W S EW BL W L P WH 85 Style X W BW P T ES EW S BL L W C X T L S WH 6 Style PHYSICAL DIMENSIONS L W T BW BL ES EW X S WH 85 MM. ±..5 ±.. Max..6 ± ±.. ±.. ±.5 (in.) (.79 ±.8) (.9 ±.8) (.5 Max.) (.8 ±.) ( ) NA (. ±.5) (. ±.) (.9 ±.) WH 6 MM.6 ±.. ±.. Max..8 ± ±.. ±..6 ±.. ±.7 (in.) (.6 ±.8) (.6 ±.8) (.8 Max.) (. ±.5) ( ) (.6 ±.) (.6 ±.) (.6 ±.) (.55 ±.) PAD DIMENSIONS T P S W L C X WH 85 MM (in.) (.6) (.) (.) (.5) (.) (.8) NA WH 6 MM (in.) (.) (.) (.) (.8) (.) (.) (.8) 7

10 High Current Feedthru Capacitors WH/WH Series PERFORMANCE CHARACTERISTICS S 6 V IMPEDANCE 6 V S () WHA8 WHA78 WHA8-5 WHA8 WHA78-6.E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) Z (Ohms) WHA8 WHA78 WHA8. WHA8 WHA78..E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) S () S 6 5V / 5V -5 WH5C8 WH5C8-6 WH5C78 WH5C8-7.E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) Z (Ohms). IMPEDANCE 6 5V / 5V WH5C8 WH5C8 WH5C78 WH5C8..E+5.E+6.E+7.E+8.E+9.E+ Freq (. MHz 9 GHz) 8

11 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering GENERAL DESCRIPTION Available in a -Element 58 and 6 Feedthru Array package, AVX s line of Feedthrus is an ideal choice for EMI suppression, broadband I/O filtering, LCD filtering and V cc power line conditioning. The unique construction of the Feedthru capacitor provides low parallel inductance and offers excellent decoupling capability for all high di/dt environments and provides significant noise reduction in digital circuits up to 5 GHz. A range of filtering characteristics is available. The Feedthru Array contains four elements with a common ground connection, making it an ideal choice for multi-line designs. Additional benefits of the multi-element array package are reduced placement costs, reduced component counts and PCB space savings. Feedthru filters can be used to meet IEC, MIL-STD- 6E, FCC, and SAE radiated and conducted emission requirements. WF Series 6 HOW TO ORDER WF 5 C 8 A T A Size & Style WH=85 WH=6 W=Plated Ni & Sb L=Plated SnPb Voltage Dielectric FREQUENCY CHARACTERISTICS Part Number Roll Off Frequency Center Frequency db Point db Range WFA8AT 7 MHz 6 MHz 97 MHz 78 MHz 5 MHz WFA78AT 65 MHz MHz 85 MHz 6 MHz MHz WFA8AT 65 MHz MHz 85 MHz 56 MHz 5 MHz WF5C8AT 5 MHz 885 MHz MHz 7 MHz MHz WF5C78AT MHz 86 MHz 6 MHz MHz 5 MHz WFA8AT 8 MHz 75 MHz 66 MHz 7 MHz 7 MHz WFA78AT MHz 75 MHz MHz 9 MHz 6 MHz WFA8AT 6 MHz MHz 79 MHz 5 MHz 7 MHz CAPACITOR VALUES & PERFORMANCE CHARACTERISTICS Part Number Capacitance Insulation Resistance Temperature Characteristics WFA8AT pf > MΩ NP WFA78AT 7pF > MΩ NP WFA8AT pf > MΩ NP WF5C8AT pf > MΩ X7R WF5C78AT 7pF > MΩ X7R WFA8AT pf > MΩ NP WFA78AT 7pF > MΩ NP WFA8AT pf > MΩ NP CASE SIZE & VOLTAGE RATINGS Capacitance Code Capacitance Tolerance Failure Rate Terminations T=Plated Ni & Sn B=Plated SnPb Packaging Part Number Case Size Current Rating DC Resistance Voltage Rating WFA8AT WFA78AT 6 ma <.6Ω V WFA8AT WF5C8AT WF5C78AT 6 ma <.6Ω 5 V WFA8AT WFA78AT 58 5 ma <.Ω 5 V WFA8AT 9

12 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WFA8AT S Curves AVX WFA8AT S Far Side Crosstalk AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements

13 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WFA78AT S Curves AVX WFA78AT S Far Side Crosstalk AVX WFA78AT Far-side XTALK Elements - AVX WFA78AT Far-side XTALK Elements AVX WFA78AT Far-side XTALK Elements - AVX WFA78AT Far-side XTALK Elements

14 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WFA8AT S Curves AVX WFA8AT S Far Side Crosstalk AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements

15 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WF5C8AT S Curves AVX WF5C8AT S Far Side Crosstalk AVX WF5C8AT Far-side XTALK Elements - AVX WF5C8AT Far-side XTALK Elements AVX WF5C8AT Far-side XTALK Elements - AVX WF5C8AT Far-side XTALK Elements

16 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WF5C78AT S Curves AVX WF5C78AT S Far Side Crosstalk AVX WF5C78AT Far-side XTALK Elements - AVX WF5C78AT Far-side XTALK Elements AVX WF5C78AT Far-side XTALK Elements - AVX WF5C78AT Far-side XTALK Elements

17 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WFA8AT S Curves AVX WFA8AT S (S) Far Side Crosstalk AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements (S) (S) AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements (S) (S)

18 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WFA78AT S Curves AVX WFA78AT S Far Side Crosstalk AVX WFA78AT Far-side XTALK Elements - AVX AVX WFA78AT Far-side XTALK Elements S () S () AVX WFA78AT Far-side XTALK Elements - AVX WFA78AT Far-side XTALK Elements S () S ()

19 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering WFA8AT S Curves AVX WFA8AT S (S) Far Side Crosstalk AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements (S) (S) AVX WFA8AT Far-side XTALK Elements - AVX WFA8AT Far-side XTALK Elements (S) (S)

20 Feedthru Filters WF / WF Series EMI Filtering, Broadband Filtering, LCD Filtering L BL ES W X S P T BW Center Line = Feedthru Paths = Common Ground DIMENSIONS millimeters (inches) L W T BW BL P X S ES +.5.5±.5.6±.. max.± REF..±..8±..±. +. (.8±.6) (.6±.8) (.8 max) (.6±.) (.7 -.) (. REF.) (.5±.) (.5±.) (.6±.) +.5.±.5.±.. max.5± REF..75±..5±..5±. +. (.8±.6) (.5±.6) (. max) (.±.) (.7 (. REF.) (.±.) (.±.) (.±.) -.) D E D A B C A F PAD LAYOUT DIMENSIONS millimeters (inches) CASE SIZE A B C D E F 6.6 (.).6 (.6). (.88).5 (.).76 (.).6 (.) (.). (.5).88 (.7).5 (.).5 (.).8 (.7) 8

21 Feedthru 85/6 Capacitors WF/WF/WF Series Applications APPLICATIONS EMI Suppression Broadband I/O Filtering Vcc Line Conditioning FEATURES Standard EIA Sizes Broad Frequency Response Low ESR 8 mm Tape and Reel MARKET SEGMENTS Computers Automotive Power Supplies Multimedia Add-On Cards Bar Code Scanners and Remote Terminals PCMCIA Cards Medical Instrumentation Test Equipment Transceivers/Cell Phones Circuits Requiring EMI Filtering THE FOLLOWING APPLICATIONS AND SCHEMATIC DIAGRAMS SHOW WHERE FEEDTHRU CAPACITORS MIGHT BE USED FOR EMI SUPPRESSION Digital to RF Interface Filtering Voltage Conditioning in RF Amplifiers Power Decoupling GaAs FET Transistor Preamplifier Vcc Line Filtering on Frequency Control Circuit Clock, Data, Control Line High Frequency Decoupling (Frequency Synthesizer) (SEE APPLICATION NOTES) DIGITAL TO RF INTERFACE FILTERING Audio Digital Block RF Block = Feedthru 9

22 Feedthru 85/6 Capacitors WF/WF Series VOLTAGE CONDITIONING IN RF AMPLIFIERS +8V R Q C9 D R6 R RFC RFC Q R RFC5 RFC7 C5 +8V C8 RF in C Z C Z C Z5 C C C Q Z6 C T T C5 RFC C C C L RFC Q Z Z Z7 R C6 C7 C8 RFC6 C5 RFC8 = Feedthru C6 R5 Z8 C C6 C +8V C C Filter L L RF Out POWER DECOUPLING GaAs FET TRANSISTOR PREAMPLIFIER S.M. = SILVER MICA J INPUT 5.6 S.M. C L L L = Feedthru 5 POT C.5pF TYPICAL FB D G S Q L R C R CHIP L5 RFC C5 CHIP 6 /W U 78L5 OUT IN GND C6. C CHIP 5 S.M. C7. D R C8 5 /8W N9 D 6V.W J OUTPUT L6 F.T. +/V ma Vcc LINE FILTERING ON FREQUENCY CONTROL CIRCUIT MHz VFO C85 N586 Q5 C87. U 78L5 R Reg OUT IN GND.μF R8 6V k C9. C9 + VCC L C8 8 C8 pf C8 C8 8 C8 5 D5 N9 R6 M R7 7k C86 C89. FB Q6 67 T To Bilateral Mixer = Feedthru R9 k R C88.

23 High Current Feedthru Capacitors WH/WH Series APPLICATIONS Vcc Filtering Dual Power Switch Filtering CONTROL WH5C8ATA.V V IN VC8J9 TransGuard M 5V 5V IN PCMCIA Card I/O Bus Controller PA Filtering Regulator Filtering WH5C8ATA WH5C8ATA WH5C78ATA IN OUT VC6D65 TransGuard RF OUT

24 Feedthru 85/6 Capacitors WF/WF/WF Series EMI REDUCTION THROUGH THE USE OF SMT FEEDTHRU CAPACITORS ABSTRACT Today s high speed, miniaturized semiconductors have made EMI issues a key design consideration. This paper briefly defines EMI and illustrates the capability of SMT feedthru capacitors. WHAT IS EMI? The term EMI stands for Electromagnetic Interference and refers to signals/energy interfering with a circuit or systems functions. In an electronic system, two classes of energy are generated - wanted and unwanted. Both are potential sources of EMI (). Wanted signals such as clocks and bus lines could cause EMI if they were not decoupled, terminated or filtered properly. Unwanted signals (cell phones, police radios, power supply noise, etc.) could be conducted or radiated into the circuit due to poor circuit layout, improper decoupling or a lack of high frequency filtering. In either type of EMI signal interference, the system could be rendered useless or put into a state which would cause early failure of its semiconductors. Even worse, the unwanted energy could cause an incorrect answer to be generated from a computer by randomly powering a gate up or down. From all of this we can gather that EMI is a complex problem, usually with no one solution. EMI interference can be a random single shot noise (like a SCR firing) or repetitive in nature (stepper motor or relay noise). The interference can enter into our designs either by being induced by E/B fields, or it can be conducted through control lines or a communication bus. EMI can even be self generated by internal components that generate steep risetime waveforms of voltage or current. HOW CAN EMI BE CONTROLLED? EMI is most efficiently controlled by realizing it to be a design parameter in the earliest stages of the design. This way, the board layout can be optimized with large power and ground planes which will be low impedance in nature. The use of SMT feedthru filters will yield optimal results. SMT FEEDTHRU CAPACITORS AVX introduced feedthru capacitors to supply a broadband EMI filter capacitor for source suppression and receiver noise reduction. SMT feedthru capacitors use the same material systems as standard ceramic capacitors. They exhibit the same reliability and can be processed in the same end user production methods as standard capacitors. What feedthru capacitors offer is an optimized frequency response across a wide RF spectrum due to a modified internal electrode design. An application comparison between an SMT feedthru and a discrete capacitor is shown in Figure. The key difference between the two filtering methods is that the feedthru has a much lower inductance between the signal line and ground than the capacitor. The difference in inductances can be in the range of roughly one order magnitude with a feedthru capacitor. This inductance can be shown in an electrical sense through the model for a feedthru and a capacitor (Figure ). INPUT Signal Trace INPUT FEEDTHRU FILTER Signal Trace OUTPUT Signal Trace INPUT SMT CAPACITOR Figure. Comparison of Feedthru Capacitors to Discrete Capacitors FEEDTHRU FILTER OUTPUT INPUT Figure. Comparison of Feedthru Capacitors to Discrete Capacitors Signal Trace OUTPUT SMT CAPACITOR OUTPUT The feedthru capacitor has a minimized parallel inductance and an optimal series inductance (which broadens the frequency response curve). attenuation graphs are shown in Figure A. These curves demonstrate feedthru capacitors advantage of a broad frequency response with high attenuation. They also serve as a comparison to the inductance of even lower inductance devices (primarily used in extreme decoupling cases and switch mode power supplies) - see Figure B. ()Practical Design for Electromagnetic Compatibility edited by Rocco F. Ficchi Hayden Book Company 978

25 Feedthru 85/6 Capacitors WF/WF/WF Series S () E+5.E+6.E+7.E+8.E+9 Impedance WF5C8AT High Frequency Analysis ~. MHz Frequency (Hz) Figure A. Attenuation Graph. 6 Frequency, MHz Feedthru 6 IDC Figure B. Comparison of SMT Capacitor Frequency Response to Feedthru Filters SMT FEEDTHRU CAPACITOR TERMINOLOGY AVX s feedthru capacitors have additional technical terminologies relative to standard ceramic capacitors. The reason for this is due to the series manner in which the feedthru element is connected to the circuit. The most important term is DC Resistance. The DC resistance of the feedthru is specified since it causes a minor signal attenuation which designers can calculate by knowing the maximum resistance of the part. The maximum current capability of the part is also of interest to designers since the feedthru may be placed in series with the voltage line. APPLICATION AND SELECTION OF SMT FEEDTHRU CAPACITOR FILTERS EMI suppression and receiver noise reduction can be achieved most effectively with efficient filtering methods. Attenuations of over are achievable depending on the complexity and size of the filters involved. However, before filtering is discussed, another EMI reduction method is noise limiting, using a series element (inductors or resistors). This method is easy to implement and inexpensive. The problem it poses is that it can only reduce noise by - to -. Because of that, series element EMI reduction is primarily used where there is a poor ground. SMT feedthru filter capacitors can actually replace discrete L/C filter networks (depending on the frequency response needed). The SMT filter capacitors should first be chosen for its specific frequency response. Then the voltage rating, DCR, and current capability must be evaluated for circuit suitability. If there is not a match on voltage, current and DC resistance ratings, the designer must select the closest available frequency response available on parts that will meet the design s power spec. The top 5 applications for SMT feedthru filter capacitors are:. Digital to RF interface filtering.. Control line high frequency decoupling.. Data and clock high frequency decoupling.. Power line high frequency decoupling. 5. High gain and RF amplifier filtering.

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