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

Transcription

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

2 Table of Contents W2F/W3F Series - 85 & 126 Feedthru Chips W2H/W3H Series - High Current Feedthru Capacitors W3F4 Series - 4 Element 126 Feedthru Array W2F/W3F/W3F4 Series - Applications W2H/W3H Series - Application W2F/W3F/W3F4 Series - Application Notes

3 W2F/W3F Series GENERAL DESCRIPTION Available in both a standard 85 and 126 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. SIGNAL LINE - INPUT OUTPUT W2F Series 85 W3F Series 126 GROUND CAPACITOR VALUES Part Number Size Voltage Dielectric Capacitance W2F11A 22 8ATxx 85 1V NP 22pF W2F11A 47 8ATxx 85 1V NP 47pF W2F11A 11 8ATxx 85 1V NP 1pF W2F11A 221 8ATxx 85 1V NP 22pF W2F11A 471 8ATxx 85 1V NP 47pF W2F15C 12 8ATxx 85 5V X7R 1pF W2F15C 222 8ATxx 85 5V X7R 22pF W2F15C 472 8ATxx 85 5V X7R 47pF W2F15C 13 8ATxx 85 5V X7R 1pF W2F15C 223 8ATxx 85 5V X7R 22pF W2F15C 473 8ATxx 85 5V X7R 47pF W3F11A 22 8ATxx 126 1V NP 22pF W3F11A 47 8ATxx 126 1V NP 47pF W3F11A 11 8ATxx 126 1V NP 1pF W3F11A 221 8ATxx 126 1V NP 22pF W3F11A 471 8ATxx 126 1V NP 47pF W3F15C 12 8ATxx 126 5V X7R 1pF W3F15C 222 8ATxx 126 5V X7R 22pF W3F15C 472 8ATxx 126 5V X7R 47pF W3F15C 13 8ATxx 126 5V X7R 1pF W3F15C 223 8ATxx 126 5V X7R 22pF W3F15C 473 8ATxx 126 5V X7R 47pF PERFORMANCE CHARACTERISTICS NP X7R Capacitance Tolerance +5%, -2% +5%, -2% Voltage Rating 1V 5V Current Rating 3mA 3mA Insulation Resistance 1MΩ 1MΩ DC Resistance <.6Ω <.6Ω Operating Temperature Range -55 to +125 C HOW TO ORDER W 3 F 1 5 C A T 3 A Style Size Feedthru Number Voltage* Dielectric Capacitance Capacitance Failure Terminations Packaging Code Quantity Code 2=85 of 1=1v A=NP Code Tolerance Rate T=Plated (Reel Size) (Pcs./Reel) 3=126 Elements 5=5v C=X7R 8=+5/-2% A=Not 1=7" Reel F=1, Applicable Embossed Tape A=2,, 3=13" Reel 4, or Embossed Tape 1, *Note: NP available in 1V only and X7R available in 5V only. 1

4 W2F/W3F 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 2.1 ± ± Max..46 ± ± ±.1.23 ±.15 (in.) (.79 ±.8) (.49 ±.8) (.45 Max.) (.18 ±.4) ( ) (.1 ±.5) (.4 ±.4) (.9 ±.6) 126 MM 3.2 ± ± Max..89 ± ± ±.1.46 ±.15 (in.) (.126 ±.8) (.63 ±.8) (.5 Max.) (.35 ±.4) ( ) (.15 ±.7) (.63 ±.4) (.18 ±.6) T P P S W C L RECOMMENDED SOLDER PAD LAYOUT (TYPICAL DIMENSIONS) T P S W L C 85 MM (in.) (.136) (.2) (.3) (.5) (.4) (.18) 126 MM (in.) (.179) (.37) (.4) (.65) (.43) (.28) 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 2

5 W2F/W3F Series PERFORMANCE CHARACTERISTICS 85 - vs. Frequency NP X7R pF 22pF -1 1pF 22pF 47pF pF 22pF 1pF pF pF -6 47pF vs. Frequency NP X7R -2 22pf 47pf 1pf 22pf 47pf -2 1pf 22pf 22,pf

6 W2F/W3F Series PERFORMANCE CHARACTERISTICS Component Temperature ( C) NP Current vs. Temperature 1pf 22pf 47pf 47pf X7R Current vs. Temperature Current (A) Component Temperature ( C) pf 22pf 47pf 1nf 47nf 22nf Current (A) NP Current vs. Temperature Component Temperature ( C) 2. 1pf 22pf 47pf 47pf 22pf X7R Current vs. Temperature Current (A) Component Temperature ( C) 2. 22pf 22,pf 1pf Current (A)

7 High Current Feedthru Capacitors W2H/W3H 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 W2H/W3H 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 2A for 85 and up to 5A for 612 Small size 85 and 612 case size Reeling in accordance with EIA-481 MECHANICAL CHARACTERISTICS Available in EIA 85 and 612 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 W2H1 5 C A T 1A Size & Style W2H1=85 W3H1=612 Voltage 3=25v 5=5v 1=1v Dielectric A=NP C=X7R Capacitance Code Capacitance Tolerance 8=+5/-2% M=±2% Failure Rate A=Not Applicable Terminations T=Plated Ni And Sn Packaging 1A=7" Reel 4 pcs 3A=13" Reel 4 pcs PINOUT CONFIGURATION Ground Signal/Vcc Signal/Vcc Signal/Vcc Ground Ground Ground W2H1 85 Style Signal/Vcc W3H1 612 Style 5

8 High Current Feedthru Capacitors W2H/W3H Series ELECTRICAL PARAMETERS Insulation Resistance 1 mohms Minimum DC Resistance <15 mohms Operating Temperature -55C to +125C CAPACITOR VALUES Part Number Size Dielectric Capacitance Tolerance Voltage Current W2H13C 14 8AT 85 X7R 1,pF +5%, -2% 25V 2A W2H15C 473 8AT 85 X7R 47,pF +5%, -2% 5V 2A W2H15C 223 8AT 85 X7R 22,pF +5%, -2% 5V 1A W2H15C 13 8AT 85 X7R 1,pF +5%, -2% 5V 1A W2H15C 12 8AT 85 X7R 1,pF +5%, -2% 5V 1A W2H11A 471 8AT 85 NP 47pF +5%, -2% 1V.5A W2H11A 221 8AT 85 NP 22pF +5%, -2% 1V.5A W2H11A 11 8AT 85 NP 1pF +5%, -2% 1V.5A W2H11A 47 8AT 85 NP 47pF +5%, -2% 1V.5A W2H11A 22 8AT 85 NP 22pF +5%, -2% 1V.5A W3H13C 14 8AT 612 X7R 1,pF +5%, -2% 25V up to 5A W3H15C 473 8AT 612 X7R 47,pF +5%, -2% 5V up to 5A W3H15C 223 8AT 612 X7R 22,pF +5%, -2% 5V up to 4A W3H15C 13 8AT 612 X7R 1,pF +5%, -2% 5V up to 3A W3H11A 471 8AT 612 NP 47pF +5%, -2% 1V up to 4A W3H11A 221 8AT 612 NP 22pF +5%, -2% 1V up to 4A W3H11A 11 8AT 612 NP 1pF +5%, -2% 1V up to 4A W3H11A 47 8AT 612 NP 47pF +5%, -2% 1V up to 3A W3H11A 22 8AT 612 NP 22pF +5%, -2% 1V up to 3A 6

9 High Current Feedthru Capacitors W2H/W3H Series PHYSICAL DIMENSIONS AND PAD LAYOUT X L BW P T C T S W S EW BL W L P W2H1 85 Style X W BW P T ES EW S BL L W C X T L S W3H1 612 Style PHYSICAL DIMENSIONS L W T BW BL ES EW X S W2H1 85 MM 2.1 ± ± Max..46 ± ± ±.1.23 ±.5 (in.) (.79 ±.8) (.49 ±.8) (.45 Max.) (.18 ±.4) ( ) NA (.1 ±.5) (.4 ±.4) (.9 ±.2) W3H1 612 MM 1.6 ± ± Max. 2.8 ± ±.1.41 ± ± ±.7 (in.) (.63 ±.8) (.126 ±.8) (.48 Max.) (.11 ±.5) ( ) (.16 ±.4) (.16 ±.4) (.63 ±.4) (.55 ±.3) PAD DIMENSIONS T P S W L C X W2H1 85 MM (in.) (.136) (.2) (.3) (.5) (.4) (.18) NA W3H1 612 MM (in.) (.1) (.12) (.44) (.18) (.24) (.13) (.28) 7

10 High Current Feedthru Capacitors W2H/W3H Series TYPICAL S21 PEFORMANCE 85 NP 85 X7R pF 22pF -1 1pF 22pF 47pF pF 22pF 1pF pF pF -6 47pF NP 612 X7R pF 22pF 1pF 47pF 22pF pF 22pF 47pF 1pF

11 W3F4 Series - 4 Element 126 Feedthru Array GENERAL DESCRIPTION The Feedthru Capacitor Array contains four elements with a common ground connection. This makes them an ideal choice for Multi-line designs needing EMI suppression, broadband I/O filtering or Vcc power line conditioning. Additional benefits are reduced component count and PCB space savings. The unique construction provides low parallel inductance and offers excellent decoupling capability for all high di/dt environments. It provides significant noise reduction in digital circuits to <5 GHz. A number of capacitor values are available in NP and X7R ceramic dielectrics. W3F4 Series 126 SIGNAL LINE - INPUT OUTPUT GROUND CAPACITOR VALUES Part Number Size Voltage Dielectric Capacitance W3F41A 22 8ATxx 126 1V NP 22pF W3F41A 47 8ATxx 126 1V NP 47pF W3F41A 11 8ATxx 126 1V NP 1pF W3F45C 221 8ATxx 126 5V X7R 22pF W3F45C 471 8ATxx 126 5V X7R 47pF PERFORMANCE CHARACTERISTICS NP X7R Capacitance Tolerance +5%, -2% +5%, -2% Voltage Rating 1V 5V Current Rating 3mA 3mA Insulation Resistance 1MΩ 1MΩ DC Resistance <.6Ω <.6Ω Operating Temperature Range -55 to +125 C HOW TO ORDER W 3 F 4 5 C A T 3 A Style Size Feedthru Number Voltage* Dielectric Capacitance Capacitance Failure Terminations Packaging Code Quantity Code 2=85 of 1=1v A=NP Code Tolerance Rate T=Plated (Reel Size) (Pcs./Reel) 3=126 Elements 5=5v C=X7R 8=+5/-2% A=Not 1=7" Reel F=1, Applicable Embossed Tape A=2,, 3=13" Reel 4, or Embossed Tape 1, *Note: NP available in 1V only and X7R available in 5V only. 9

12 W3F4 Series - 4 Element 126 Feedthru Array L BL ES W X S P W BW Center Line = Feedthru Paths = Common Ground DIMENSIONS millimeters (inches) L W T BW BL P X S ES ± ± max.41± ref. 1.14±.1.38±.1.41±.1 (.128±.6) (.63±.8) (.48 max) (.16±.4) ( (.3 ref.) (.45±.4) (.15±.4) (.16±.4) -.3 ) E D D A B C A F PAD LAYOUT DIMENSIONS A B C D E F mm Inches (.24) (.64) (.88) (.14) (.3) (.14) 1

13 W3F4 Series - 4 Element 126 Feedthru Array PERFORMANCE CHARACTERISTICS S21 vs. Frequency NP 4 Element Feedthru S21 vs. Frequency X7R 4 Element Feedthru pF -2 22pF 47pF 1pF -2 47pF Frequency, GHz Frequency, GHz 11

14 W2F/W3F/W3F4 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 Typical 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 12

15 W2F/W3F Series VOLTAGE CONDITIONING IN RF AMPLIFIERS +28V R1 Q1 C9 D1 R6 R4 RFC1 RFC2 Q2 R2 RFC5 RFC7 C25 +28V C18 RF in C1 Z1 C2 Z2 C3 Z5 C4 C11 C12 Q3 Z6 C13 T2 T1 C5 RFC4 C1 C14 C21 L1 RFC3 Q4 Z3 Z4 Z7 R3 C6 C7 C8 RFC6 C15 RFC8 = Feedthru C26 R5 Z8 C22 C16 C23 +28V C2 C24 Filter L2 L3 RF Out POWER DECOUPLING GaAs FET TRANSISTOR PREAMPLIFIER S.M. = SILVER MICA J1 INPUT 5.6 S.M. C1 L1 L2 L3 = Feedthru 5 POT G C2 1.5pF TYPICAL C4 R1 D S Q1 FB L5 L4 R2 62 1/4W 2 CHIP RFC1 2 C5 CHIP U1 78L5 OUT IN GND C6.1 C3 2 CHIP 15 S.M. C7.1 D1 R3 C8 51 1/8W 1N914 D2 16V.4W J2 OUTPUT L6 1 F.T. +12/14V 14mA Vcc LINE FILTERING ON FREQUENCY CONTROL CIRCUIT MHz VFO C85 C N5486 Q25 U1 78L5 R141 1 Reg OUT IN GND 2.2µF R138 16V 1k C91.22 C9 + VCC L3 C8 82 C81 24pF C83 24 C C84 5 D25 1N914 R136 1M R137 47k C86 1 C89.22 FB1 Q T14 To Bilateral Mixer = Feedthru R139 1k R14 1 C

16 High Current Feedthru Capacitors W2H/W3H Series APPLICATIONS Vcc Filtering Dual Power Switch Filtering CONTROL W3H15C2238AT1A 3.3V 3V IN VC12118J39 TransGuard M 5V 5V IN PCMCIA Card I/O Bus Controller PA Filtering Regulator Filtering W2H15C148AT1A W2H15C138AT1A W3H15C4738AT1A IN OUT VC1263D65 TransGuard RF OUT 14

17 W2F/W3F/W3F4 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 (1). 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 AVXintroduced 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 1. 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 2). INPUT Signal Trace INPUT FEEDTHRU FILTER Signal Trace OUTPUT Signal Trace INPUT SMT CAPACITOR Figure 1. Comparison of Feedthru Capacitors to Discrete Capacitors FEEDTHRU FILTER OUTPUT INPUT Figure 2. 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). Typical attenuation graphs are shown in Figure 3A. 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 3B. (1)Practical Design for Electromagnetic Compatibility edited by Rocco F. Ficchi Hayden Book Company

18 W2F/W3F/W3F4 Series vs. Frequency NP 47pF 22pF 1pF 47pF 22pF 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 pf 22pf 22,pf Impedance Figure 3A. Feedthru Capacitor Attenuation Graphs (Forward Transmission Characteristic - S21) vs. Frequency X7R 126 Feedthru 612 IDC 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 1 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 -3 to -1. 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: 1. Digital to RF interface filtering. 2. Control line high frequency decoupling. 3. Data and clock high frequency decoupling. 4. Power line high frequency decoupling. 5. High gain and RF amplifier filtering Figure 3B. Comparison of SMT Capacitor Frequency Response to Feedthru Filters 16

19 W2F/W3F/W3F4 Series A typical example of data, clock control line and power line filtering is shown below: Clock, Data, Control Line High Frequency Decoupling (Frequency Synthesizer) CLOCK 1K V CC FOR OP AMP V CC FOR VCO DATA 1K ENABLE K IC1 LMX2314 1T19 C bypass 22K* 1K* IC2 + 4 C bypass V CC VLine VCO 1K* C out 18 RF OUTPUT pF* 1pF* 1pF* 1pF* REFERENCE INPUT 1pF 51 1pF 1pF 1pF* 51 Vcc +5V LOCK DETECTOR 1pF = Feedthru CONCLUSION EMI problems will continue to play a large role in designers priorities. AVX SMT feedthru filters are an easy way to achieve broad band EMI reduction in a small SMT package. SMT feddthru filters can help reduce cost designs by eliminating some types of L/C filters, increasing system reliability and saving valuable PCB area. SMT feedthru filters are offered in both 85, 126 single element packages or in 126 four element packages. NOTICE: Specifications are subject to change without notice. Contact your nearest AVX Sales Office for the latest specifications. All statements, information and data given herein are believed to be accurate and reliable, but are presented without guarantee, warranty, or responsibility of any kind, expressed or implied. Statements or suggestions concerning possible use of our products are made without representation or warranty that any such use is free of patent infringement and are not recommendations to infringe any patent. The user should not assume that all safety measures are indicated or that other measures may not be required. Specifications are typical and may not apply to all applications.

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