W3F41A1018AT1F [KYOCERA AVX]
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| 型号： | W3F41A1018AT1F |
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KYOCERA AVX |
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A KYOCERA GROUP COMPANY
AVX
Mu lt ila ye r Ce ra m ic Fe e d t h ru
Ch ip Ca p a c it o rs An d Arra ys
Feedthru 0805/1206 Capacitors
Table of Contents
W2F/W3F Series - 0805 & 1206 Feedthru Chips . . . . . . . . . . . . . . . . . . . . . . . . . . 1
W2H/W3H Series - High Current Feedthru Capacitors . . . . . . . . . . . . . . . . . . . . 5
W3F4 Series - 4 Element 1206 Feedthru Array . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
W2F/W3F/W3F4 Series - Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
W2H/W3H Series - Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
W2F/W3F/W3F4 Series - Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Feedthru 0805/1206 Capacitors
W2F/W3F Series
GENERAL DESCRIPTION
Available in both a standard 0805 and 1206 size, AVX’s line
W2F Series
W3F Series
0805
1206
of feedthru capacitors are ideal choices for EMI suppres-
sion, broadband I/O filtering, or Vcc power line condition-
ing. The unique construction of a feedthru capacitor pro-
vides low parallel inductance and offers excellent decou-
pling 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 NP0
or X7R ceramic dielectrics.
OUTPUT
SIGNAL LINE - INPUT
GROUND
CAPACITOR VALUES
Part Number
Size
Voltage
Dielectric
NP0
NP0
NP0
NP0
NP0
X7R
Capacitance
22pF
W2F11A 220 8ATxx
W2F11A 470 8ATxx
W2F11A 101 8ATxx
W2F11A 221 8ATxx
W2F11A 471 8ATxx
W2F15C 102 8ATxx
W2F15C 222 8ATxx
W2F15C 472 8ATxx
W2F15C 103 8ATxx
W2F15C 223 8ATxx
W2F15C 473 8ATxx
W3F11A 220 8ATxx
W3F11A 470 8ATxx
W3F11A 101 8ATxx
W3F11A 221 8ATxx
W3F11A 471 8ATxx
W3F15C 102 8ATxx
W3F15C 222 8ATxx
W3F15C 472 8ATxx
W3F15C 103 8ATxx
W3F15C 223 8ATxx
W3F15C 473 8ATxx
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206
100V
100V
100V
100V
100V
50V
47pF
100pF
220pF
470pF
1000pF
2200pF
4700pF
10000pF
22000pF
47000pF
22pF
50V
X7R
50V
X7R
50V
X7R
50V
X7R
50V
X7R
100V
100V
100V
100V
100V
50V
NP0
NP0
NP0
NP0
NP0
X7R
47pF
100pF
220pF
470pF
1000pF
2200pF
4700pF
10000pF
22000pF
47000pF
50V
X7R
50V
X7R
50V
X7R
50V
X7R
50V
X7R
PERFORMANCE CHARACTERISTICS
NP0
X7R
Capacitance Tolerance
Voltage Rating
+50%, -20%
100V
+50%, -20%
50V
Current Rating
300mA
300mA
Insulation Resistance
DC Resistance
Operating Temperature Range
1000MΩ
1000MΩ
<0.6Ω
<0.6Ω
-55 to +125°C
HOW TO ORDER
W
3
F
1
5
C
223
8
A
T
3
A
Style Size Feedthru Number Voltage* Dielectric Capacitance Capacitance Failure Terminations Packaging Code Quantity Code
2=0805
3=1206
of
1=100v A=NP0
C=X7R
Code
Tolerance
8=+50/-20% A=Not
Applicable
Rate
T=Plated
(Reel Size)
1=7" Reel
Embossed Tape
3=13" Reel
(Pcs./Reel)
F=1,000
A=2,000,
4,000 or
10,000
Elements 5=50v
Embossed Tape
*Note: NP0 available in 100V only and X7R available in 50V only.
1
Feedthru 0805/1206 Capacitors
W2F/W3F Series
Common Ground
Feedthru Pad
Feedthru Pad
L
C
L
X
S
BL
T
W
EW
BW
Common Ground
DIMENSIONS
L
W
T
BW
0.46 0.10
BL
0.18 + 0.25 -0.08
EW
0.25 0.13
X
S
0805 MM
(in.)
2.01 0.20
1.25 0.20
1.14 Max.
1.02 0.10
0.23 0.15
(0.079 0.008)
(0.049 0.008)
(0.045 Max.)
(0.018 0.004) (0.007 + 0.010 -0.003) (0.010 0.005) (0.040 0.004) (0.009 0.006)
1206 MM
(in.)
3.20 0.20
(0.126 0.008)
1.60 0.20
(0.063 0.008)
1.27 Max.
(0.050 Max.)
0.89 0.10 0.18 + 0.25 -0.08 0.38 0.18 1.60 0.10 0.46 0.15
(0.035 0.004) (0.007 + 0.010 -0.003) (0.015 0.007) (0.063 0.004) (0.018 0.006)
T
P
P
S
W
C
L
RECOMMENDED SOLDER PAD LAYOUT (TYPICAL DIMENSIONS)
T
P
S
W
L
C
0805 MM
(in.)
3.45
(0.136)
0.51
(0.020)
0.76
(0.030)
1.27
(0.050)
1.02
(0.040)
0.46
(0.018)
1206 MM
(in.)
4.54
(0.179)
0.94
(0.037)
1.02
(0.040)
1.65
(0.065)
1.09
(0.043)
0.71
(0.028)
TYPICAL FEEDTHRU CHIP CAP CONNECTION
Feedthru Chip Component Model
Physical Layout - A
Ground
Vcc or
Signal Out
Vcc or
Signal In
Signal Out
Signal In
Ground
Ground
The terminals are connected internally side to side.
Left side and right side are connected and front and
back are connected internally.
Physical Layout - B
Ground
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
Vcc
Ground
2
Feedthru 0805/1206 Capacitors
W2F/W3F Series
PERFORMANCE CHARACTERISTICS
0805 - dB vs. Frequency
NP0
X7R
10
0
20
10
47pF
22pF
1000pF
0
-10
-20
-30
-40
-50
-60
2200pF
4700pF
-10
-20
-30
-40
-50
-60
-70
470pF
220pF
100pF
10000pF
22000pF
1
10
100
Frequency, MHz
1000
10000
47000pF
1
10
100
1000
10000
Frequency, MHz
1206 - dB vs. Frequency
NP0
X7R
0
-20
-40
-60
0
-20
-40
-60
22pf
47pf
100pf
1000pf
2200pf
22,000pf
220pf
470pf
10
100
1000
10
100
1000
Frequency, MHz
Frequency, MHz
3
Feedthru 0805/1206 Capacitors
W2F/W3F Series
PERFORMANCE CHARACTERISTICS
0805 NP0
Current vs. Temperature
40.00
35.00
30.00
220pf
100pf
47pf
470pf
25.00
20.00
0.3
0.5
0.7
0.8
1.00
1.20
Current (A)
0805 X7R
Current vs. Temperature
40.00
35.00
30.00
1000pf
2200pf
4700pf
10nf
47nf
22nf
25.00
20.00
0.3
0.5
0.7
0.8
1.00
1.20
Current (A)
1206 NP0
Current vs. Temperature
40.00
22pf
220pf
100pf
47pf
470pf
20.00
0.00
0.3
0.5
0.75
0.87
1.00
1.20
Current (A)
1206 X7R
Current vs. Temperature
40.00
20.00
0.00
1000pf
22,000pf
2200pf
0.3
0.5
0.75
0.87
1.00
1.20
Current (A)
4
High Current Feedthru Capacitors
W2H/W3H Series
GENERAL DESCRIPTION
MECHANICAL CHARACTERISTICS
High current feedthru capacitors are designed as a broad-
band 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.
• Available in EIA 0805 and 0612 cases
• Plated Tin over Nickel Barrier
• Packaged in Tape & Reel
TYPICAL APPLICATIONS
• High current power (Vcc) lines
• PA decoupling
FEATURES
• Low parallel inductance provides significant noise
reduction in circuits with operating frequencies up to 5GHz
• DC:DC converters
• Regulators
• Power supervisory circuits
• Broad frequency response with high attenuation
• High rated current – up to 2A for 0805 and up to 5A
for 0612
• Small size – 0805 and 0612 case size
• Reeling in accordance with EIA-481
HOW TO ORDER
W2H1
5
C
473
8
A
T
1A
Size & Style
W2H1=0805
W3H1=0612
Voltage
3=25v
5=50v
Dielectric
A=NP0
C=X7R
Capacitance
Code
Capacitance
Tolerance
8=+50/-20%
M= 20%
Failure
Rate
Terminations
T=Plated Ni
And Sn
Packaging
1A=7" Reel
4000 pcs
3A=13" Reel
4000 pcs
A=Not
1=100v
Applicable
PINOUT CONFIGURATION
Signal/Vcc
Ground
Ground
Ground
Signal/Vcc
Signal/Vcc
Signal/Vcc
Ground
W2H1 – 0805 Style
W3H1 – 0612 Style
5
High Current Feedthru Capacitors
W2H/W3H Series
ELECTRICAL PARAMETERS
Insulation Resistance
DC Resistance
1000 mOhms Minimum
<150 mOhms
Operating Temperature
-55C to +125C
CAPACITOR VALUES
Part Number
Size
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0612
0612
0612
0612
0612
0612
0612
0612
0612
Dielectric
X7R
Capacitance
100,000pF
47,000pF
22,000pF
10,000pF
1,000pF
470pF
Tolerance
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
+50%, -20%
Voltage
25V
Current
2A
W2H13C 104 8AT
W2H15C 473 8AT
W2H15C 223 8AT
W2H15C 103 8AT
W2H15C 102 8AT
W2H11A 471 8AT
W2H11A 221 8AT
W2H11A 101 8AT
W2H11A 470 8AT
W2H11A 220 8AT
W3H13C 104 8AT
W3H15C 473 8AT
W3H15C 223 8AT
W3H15C 103 8AT
W3H11A 471 8AT
W3H11A 221 8AT
W3H11A 101 8AT
W3H11A 470 8AT
W3H11A 220 8AT
X7R
50V
2A
X7R
50V
1A
X7R
50V
1A
X7R
50V
1A
NP0
NP0
NP0
NP0
NP0
X7R
100V
100V
100V
100V
100V
25V
0.5A
220pF
0.5A
100pF
47pF
22pF
0.5A
0.5A
0.5A
100,000pF
47,000pF
22,000pF
10,000pF
470pF
up to 5A
up to 5A
up to 4A
up to 3A
up to 4A
up to 4A
up to 4A
up to 3A
up to 3A
X7R
50V
X7R
50V
X7R
50V
NP0
NP0
NP0
NP0
NP0
100V
100V
100V
100V
100V
220pF
100pF
47pF
22pF
6
High Current Feedthru Capacitors
W2H/W3H Series
PHYSICAL DIMENSIONS AND PAD LAYOUT
L
T
BW
C
P
X
T
W
S
S
BL
EW
W
L
P
W2H1 – 0805 Style
W
X
BW
S
P
T
T
S
W
C
BL
EW
ES
X
L
L
W3H1 – 0612 Style
PHYSICAL DIMENSIONS
L
W
T
BW
BL
ES
EW
X
S
W2H1– 0805 MM
2.01 0.20
1.25 0.20
1.14 Max.
0.46 0.10
(0.018 0.004)
0.18 + 0.25 -0.08
(0.007 + 0.010 -0.003)
0.25 0.13
(0.010 0.005)
1.02 0.10
(0.040 0.004)
0.23 0.05
(0.009 0.002)
NA
(in.) (0.079 0.008) (0.049 0.008) (0.045 Max.)
W3H1– 0612 MM 1.60 0.20 3.20 0.20 1.22 Max.
2.80 .127
0.18 + 0.25 -0.08
(0.007 + 0.010 -0.003)
0.41 0.10
(0.016 0.004)
0.41 0.10
(0.016 0.004)
1.60 0.10
(0.063 0.004)
1.40 0.07
(0.055 0.003)
(in.) (0.063 0.008) (0.126 0.008) (0.048 Max.) (0.110 0.005)
PAD DIMENSIONS
T
P
S
W
L
C
X
W2H1– 0805 MM
(in.)
3.45
(0.136)
0.51
(0.020)
0.76
(0.030)
1.27
(0.050)
1.02
(0.040)
0.46
(0.018)
NA
W3H1– 0612 MM
(in.)
2.54
(0.100)
3.05
(0.120)
1.12
(0.044)
.460
(0.018)
.610
(0.024)
.330
(0.013)
.710
(0.028)
7
High Current Feedthru Capacitors
W2H/W3H Series
TYPICAL S21 PEFORMANCE
0805 NP0
0805 X7R
10
0
20
10
47pF
22pF
1000pF
2200pF
4700pF
0
-10
-20
-30
-40
-50
-60
-10
-20
-30
-40
-50
-60
-70
470pF
220pF
100pF
10000pF
22000pF
1
10
100
1000
10000
47000pF
Frequency, MHz
1
10
100
1000
10000
Frequency, MHz
0612 NP0
0612 X7R
0
0
10000pF
22000pF
47000pF
100000pF
-5
-10
-10
470pF
220pF
100pF
47pF
22pF
-15
-20
-30
-40
-50
-60
-20
-25
-30
-35
-40
-45
1
10
100
Frequency, MHz
1000
10000
1
10
100
1000
10000
Frequency, MHz
8
Feedthru 0805/1206 Capacitors
W3F4 Series - 4 Element 1206 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 par-
allel 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 capac-
itor values are available in NP0 and X7R ceramic dielectrics.
W3F4 Series
1206
OUTPUT
SIGNAL LINE - INPUT
GROUND
CAPACITOR VALUES
Part Number
Size
1206
1206
1206
1206
1206
Voltage
100V
100V
100V
50V
Dielectric
NP0
Capacitance
22pF
W3F41A 220 8ATxx
W3F41A 470 8ATxx
W3F41A 101 8ATxx
W3F45C 221 8ATxx
W3F45C 471 8ATxx
NP0
47pF
NP0
100pF
X7R
220pF
50V
X7R
470pF
PERFORMANCE CHARACTERISTICS
NP0
X7R
+50%, -20%
50V
Capacitance Tolerance
Voltage Rating
+50%, -20%
100V
Current Rating
300mA
300mA
Insulation Resistance
DC Resistance
Operating Temperature Range
1000MΩ
1000MΩ
<0.6Ω
<0.6Ω
-55 to +125°C
HOW TO ORDER
W
3
F
4
5
C
223
8
A
T
3
A
Style Size Feedthru Number Voltage* Dielectric Capacitance Capacitance Failure Terminations Packaging Code Quantity Code
2=0805
3=1206
of
1=100v A=NP0
C=X7R
Code
Tolerance
8=+50/-20% A=Not
Applicable
Rate
T=Plated
(Reel Size)
1=7" Reel
Embossed Tape
3=13" Reel
(Pcs./Reel)
F=1,000
A=2,000,
4,000 or
10,000
Elements 5=50v
Embossed Tape
*Note: NP0 available in 100V only and X7R available in 50V only.
9
Feedthru 0805/1206 Capacitors
W3F4 Series - 4 Element 1206 Feedthru Array
BL
L
W
ES
P
S
X
W
BW
= Feedthru Paths
Center Line
= Common Ground
DIMENSIONS
millimeters (inches)
L
W
T
BW
0.41 0.10
BL
P
X
S
ES
0.41 0.10
+0.25
-0.08
3.25 0.15
1.60 0.20
1.22 max
0.18
0.76 ref.
1.14 0.10
0.38 0.10
+0.010
-0.003
(0.128 0.006) (0.063 0.008) (0.048 max) (0.016 0.004) (0.007
)
(0.030 ref.) (0.045 0.004) (0.015 0.004) (0.016 0.004)
E
D
A
B
C
D
A
F
PAD LAYOUT DIMENSIONS
A
B
C
D
E
F
mm
Inches
0.6
(0.024)
1.6
(0.064)
2.2
(0.088)
0.35
(0.014)
0.76
(0.030)
2.6
(0.104)
10
Feedthru 0805/1206 Capacitors
W3F4 Series - 4 Element 1206 Feedthru Array
PERFORMANCE CHARACTERISTICS
S21 vs. Frequency
S21 vs. Frequency
NP0 4 Element Feedthru
X7R 4 Element Feedthru
0
0
-10
-20
-30
220pF
-10
-20
22pF
47pF
100pF
470pF
-30
-40
-40
-50
0.01
0.1
Frequency, GHz
1.0
10
0.01
0.1
1.0
Frequency, GHz
10
11
Feedthru 0805/1206 Capacitors
W2F/W3F/W3F4 Series
Applications
Standard EIA Sizes
Broad Frequency Response
Low ESR
APPLICATIONS
EMI Suppression
FEATURES
MARKET SEGMENTS
Computers
Broadband I/O Filtering
Vcc Line Conditioning
Automotive
Power Supplies
8 mm Tape and Reel
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
Feedthru 0805/1206 Capacitors
W2F/W3F Series
VOLTAGE CONDITIONING IN RF AMPLIFIERS
+28V
Q1
R1
D1
R4
R6
Z2
C9
+28V
RFC7
RFC1
RFC2
Q2
C2
C25
C18
R2
RFC5
Q3
Z1
Z5
C11 C12
Z6
C13
C1
RF in
T2
C3
C4
T1
C14
C10
C5
C21
C22
C23
RFC4
L1
Filter
RFC3
Z3
Q4
Z4
Z7
Z8
C16
L2
L3
R3
C6
C7
C8
C15
RFC6
RFC8
+28V
R5
= Feedthru
C26
C20
C24
RF Out
POWER DECOUPLING GaAs FET TRANSISTOR PREAMPLIFIER
C2
J2
OUTPUT
C3
1.5pF
L5
TYPICAL
S.M. = SILVER MICA
200
51
1/8W
RFC1
CHIP
FB
5.6
J1
R3
S.M.
INPUT
200
CHIP
D
L3
C5
G
15
S.M.
S
L6
C8
C1
Q1
L4
62
1/4W
R2
L1
L2
U1
200
CHIP
78L05
IN
1N914
D2
C4
+12/14V
14mA
R1
500
POT
OUT
GND
D1
16V
0.4W
1000
F. T.
C6
0.1
C7
0.1
= Feedthru
Vcc LINE FILTERING ON FREQUENCY CONTROL CIRCUIT
6-6.35 MHz VFO
U10
78L05
VCC
R141
100
C91
0.022
Reg
C87
IN
OUT
GND
0.022
2.2µF
C90
16V
2N5486
Q25
R138
100k
C85
2
+
C81
C82
82
C80
82
C89
0.022
FB1
D25
1N914
To Bilateral
Mixer
R137
47k
24pF
L3
R136
1M
T14
40673
C84
50
C83
24
Q26
C86
10
R139
100k
C88
0.022
R140
100
= Feedthru
13
High Current Feedthru Capacitors
W2H/W3H Series
APPLICATIONS
Vcc Filtering
Dual Power Switch Filtering
W3H15C2238AT1A
CONTROL
3.3V
5V
3VIN
5VIN
PCMCIA
Card
M
VC121018J390
TransGuard
I/O Bus
Controller
PA Filtering
Regulator Filtering
W3H15C4738AT1A
W2H15C1048AT1A W2H15C1038AT1A
OUT
IN
VC120630D650
TransGuard
RF OUT
14
Feedthru 0805/1206 Capacitors
W2F/W3F/W3F4 Series
EMI REDUCTION THROUGH THE USE OF SMT FEEDTHRU CAPACITORS
ty and can be processed in the same end user production
ABSTRACT
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.
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.
An application comparison between an SMT feedthru and a
discrete capacitor is shown in Figure 1.
WHAT IS EMI?
The term EMI stands for Electromagnetic Interference and
refers to signals/energy interfering with a circuit or systems
functions.
Signal Trace
INPUT
Signal Trace
OUTPUT
Signal Trace
INPUT
Signal Trace
OUTPUT
FEEDTHRU FILTER
SMT CAPACITOR
In an electronic system, two classes of energy are generated
- wanted and unwanted. Both are potential sources of EMI .
(1)
Figure 1. Comparison of Feedthru Capacitors
to Discrete Capacitors
Wanted signals such as clocks and bus lines could cause
EMI if they were not decoupled, terminated or filtered prop-
erly. 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.
The key difference between the two filtering methods is that
the feedthru has a much lower inductance between the sig-
nal line and ground than the capacitor. The difference in
inductances can be in the range of roughly one order mag-
nitude with a feedthru capacitor. This inductance can be
shown in an electrical sense through the model for a feedthru
and a capacitor (Figure 2).
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 prob-
lem, 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 communi-
cation bus. EMI can even be self generated by internal com-
ponents that generate steep risetime waveforms of voltage
or current.
INPUT
INPUT
OUTPUT
OUTPUT
FEEDTHRU FILTER
SMT CAPACITOR
HOW CAN EMI BE CONTROLLED?
Figure 2. Comparison of Feedthru Capacitors
to Discrete Capacitors
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.
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.
SMT FEEDTHRU CAPACITORS
AVX introduced feedthru capacitors to supply a broadband
EMI filter capacitor for source suppression and receiver noise
reduction.
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.
SMT feedthru capacitors use the same material systems as
standard ceramic capacitors. They exhibit the same reliabili-
(1)Practical Design for Electromagnetic Compatibility edited by Rocco F. Ficchi
Hayden Book Company 1978
15
Feedthru 0805/1206 Capacitors
W2F/W3F/W3F4 Series
SMT FEEDTHRU CAPACITOR
TERMINOLOGY
0805 - dB vs. Frequency
NP0
AVX’s feedthru capacitors have additional technical termi-
nologies 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.
20
10
47pF
22pF
0
-10
-20
-30
-40
-50
-60
The most important term is DC Resistance. The DC resis-
tance of the feedthru is specified since it causes a minor sig-
nal attenuation which designers can calculate by knowing
the maximum resistance of the part.
470pF
220pF
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.
100pF
1
10
100
1000
10000
APPLICATION AND SELECTION OF
SMT FEEDTHRU CAPACITOR FILTERS
Frequency, MHz
EMI suppression and receiver noise reduction can be
achieved most effectively with efficient filtering methods.
Attenuations of over 100 dB are achievable depending on
the complexity and size of the filters involved.
1206 - dB vs. Frequency
X7R
0
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 inexpen-
sive. The problem it poses is that it can only reduce noise by
-3 to -10 dB. Because of that, series element EMI reduction
is primarily used where there is a poor ground.
1000pf
2200pf
22,000pf
-20
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 avail-
able frequency response available on parts that will meet the
design’s power spec.
-40
-60
10
100
1000
Frequency, MHz
The top 5 applications for SMT feedthru filter capacitors are:
Figure 3A. Feedthru Capacitor Attenuation Graphs
(Forward Transmission Characteristic - S21)
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.
30
10
IDC
3
Feedthru
1
0612
0.3
1206
0.1
0.03
0.01
0.1
1
10
100
1000
Frequency, MHz
Figure 3B. Comparison of SMT Capacitor
Frequency Response to Feedthru Filters
16
Feedthru 0805/1206 Capacitors
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)
10K
CLOCK
DATA
VCC
FOR OP AMP
VCC
FOR VCO
10K
Cbypass
Cbypass
10K
ENABLE
VCC
2
3
7
Cout
-
VLine
10K*
IC1
18
18
6
RF
OUTPUT
22K*
10K*
1000pF* 1000pF*
IC2
+
VCO
4
1615
1
1T109
18
LMX2314
100pF*
100pF*
51
2
3
4
5
6
7
8
100pF*
1000pF
51
REFERENCE
INPUT
1000pF
1000pF
Vcc
+5V
= Feedthru
100pF
LOCK
DETECTOR
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 elimi-
nating some types of L/C filters, increasing system reliability
and saving valuable PCB area. SMT feedthru filters are
offered in both 0805, 1206 single element packages or in
1206 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.
USA
AVX Myrtle Beach, SC
Corporate Offices
AVX North Central, IN
AVX Southwest, AZ
Tel: 480-539-1496
FAX: 480-539-1501
AVX Southeast, GA
Tel: 404-608-8151
FAX: 770-972-0766
Tel: 317-848-7153
FAX: 317-844-9314
Tel: 843-448-9411
FAX: 843-448-1943
AVX Mid/Pacific, MN
Tel: 952-974-9155
FAX: 952-974-9179
AVX South Central, TX
AVX Canada
Tel: 905-564-8959
FAX: 905-564-9728
AVX Northwest, WA
Tel: 360-699-8746
FAX: 360-699-8751
Tel: 972-669-1223
FAX: 972-669-2090
EUROPE
AVX Limited, England
AVX S.A., France
Tel: ++33 (1) 69-18-46-00
FAX: ++33 (1) 69-28-73-87
AVX srl, Italy
Tel: ++390 (0)2 614-571
FAX: ++390 (0)2 614-2576
European Headquarters
Tel: ++44 (0) 1252-770000
FAX: ++44 (0) 1252-770001
AVX GmbH, Germany
Tel: ++49 (0) 8131-9004-0
FAX: ++49 (0) 8131-9004-44
AVX Czech Republic
Tel: ++420 (0) 465-358-111
FAX: ++420 (0) 465-323-010
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Tel: ++44 (0) 1638-675000
FAX: ++44 (0) 1638-675001
ASIA-PACIFIC
AVX/Kyocera, Singapore
Asia-Pacific Headquarters
AVX/Kyocera, Taiwan
Tel: (886) 2-2698-8778
FAX: (886) 2-2698-8777
Kyocera, Japan - KDP
Tel: (81) 75-604-3424
FAX: (81) 75-604-3425
Tel: (65) 6286-7555
FAX: (65) 6488-9880
AVX/Kyocera, Shanghai, China
AVX/Kyocera, Malaysia
AVX/Kyocera, Hong Kong
Tel: 86-21 6886 1000
FAX: 86-21 6886 1010
Tel: (60) 4-228-1190
FAX: (60) 4-228-1196
Tel: (852) 2-363-3303
FAX: (852) 2-765-8185
AVX/Kyocera, Tianjin, China
Elco, Japan
Tel: 86-22 2576 0098
FAX: 86-22 2576 0096
Tel: 045-943-2906/7
FAX: 045-943-2910
AVX/Kyocera, Korea
Tel: (82) 2-785-6504
FAX: (82) 2-784-5411
Kyocera, Japan - AVX
Tel: (81) 75-604-3426
FAX: (81) 75-604-3425
Contact:
A KYOCERA GROUP COMPANY
http://www.avxcorp.com
S-FTCA00M703-C
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