W2H15C1028AT2A [KYOCERA AVX]
Feed Through Capacitor, ROHS COMPLIANT, EIA STD PACKAGE SIZE 0805, 4 PIN;型号: | W2H15C1028AT2A |
厂家: | KYOCERA AVX |
描述: | Feed Through Capacitor, ROHS COMPLIANT, EIA STD PACKAGE SIZE 0805, 4 PIN |
文件: | 总16页 (文件大小:638K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AVX Multilayer Ceramic
SMD Feedthru Capacitors
Version 16.4
Feedthru 0805/1206 Capacitors
Table of Contents
W2F/W3F Series - 0805 & 1206 Feedthru Chips . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Tin/Lead L2F/L3F Series - 0805 & 1206 Feedthru Chips . . . . . . . . . . . . . . . . . . . 5
W2H - High Current Feedthru Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
W2F/W3F Series - Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
W2H Series - Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
W2F/W3F Series - Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
REV 01
Feedthru 0805/1206 Capacitors
W2F/W3F Series
GENERAL DESCRIPTION
W2F Series
W3F Series
Available in both a standard 0805 and 1206 size, AVX’s line
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. AVX FeedThru filters are AEC
Q200 qualified. High reliability screening options are avail-
able for spacecraft designs.
OUTPUT
SIGNAL LINE - INPUT
GROUND
CAPACITOR VALUES
Part Number
Size
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206
Voltage
Dielectric
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
100V
100V
100V
100V
100V
50V
NP0
NP0
NP0
NP0
NP0
X7R
X7R
X7R
X7R
X7R
X7R
NP0
NP0
NP0
NP0
NP0
X7R
X7R
X7R
X7R
X7R
X7R
47pF
100pF
220pF
470pF
1000pF
2200pF
4700pF
10000pF
22000pF
47000pF
22pF
50V
50V
50V
50V
50V
100V
100V
100V
100V
100V
50V
47pF
100pF
220pF
470pF
1000pF
2200pF
4700pF
10000pF
22000pF
47000pF
50V
50V
50V
50V
50V
PERFORMANCE CHARACTERISTICS
NP0
X7R
Capacitance Tolerance
Voltage Rating
Current Rating
+50%, -20%
100V
+50%, -20%
50V
300mA
300mA
Insulation Resistance
DC Resistance
Operating Temperature Range
1000MΩ
<0.6Ω
1000MΩ
<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 Rate
Termination
Packaging Code
(Reel Size)
Quantity
Code
W = Plated Ni & Sn 2 = 0805
of
1 = 100V
A = NP0
C = X7R
Code
Tolerance
A = Not Applicable T = Plated Ni & Sn
L = Plated SnPb
3 = 1206
Elements 5 = 50V
8 = +50/-20% 4 = AUTOMOTIVE B = Plated SnPb
1 & 2 = 7" Reel
Embossed Tape
3 & 4 = 13" Reel
Embossed Tape
(Pcs./Reel)
F = 1,000
A = 2,000,
4,000 or
10,000
*AECQ-200 Qualified. Contact factory for other values.
**Note: NP0 available in 100V only and X7R available in 50V only.
1
REV 01
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 0.008ꢀ
(0.049 0.008ꢀ
(0.045 Max.ꢀ
(0.018 0.004ꢀ (0.007 + 0.010 -0.003ꢀ (0.010 0.005ꢀ (0.040 0.004ꢀ (0.009 0.006ꢀ
1206 MM
(in.)
3.20 0.20
(0.126 0.008ꢀ
1.60 0.20
(0.063 0.008ꢀ
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 0.004ꢀ (0.007 + 0.010 -0.003ꢀ (0.015 0.007ꢀ (0.063 0.004ꢀ (0.018 0.006ꢀ
T
P
P
S
W
C
L
RECOMMENDED SOLDER PAD LAYOUT (TYPICAL DIMENSIONS)
T
P
S
W
L
C
0805 MM
(in.)
3.45
(0.136ꢀ
0.51
(0.020ꢀ
0.76
(0.030ꢀ
1.27
(0.050ꢀ
1.02
(0.040ꢀ
0.46
(0.018ꢀ
1206 MM
(in.)
4.54
(0.179ꢀ
0.94
(0.037ꢀ
1.02
(0.040ꢀ
1.65
(0.065ꢀ
1.09
(0.043ꢀ
0.71
(0.028ꢀ
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
REV 01
Feedthru 0805/1206 Capacitors
W2F/W3F Series
PERFORMANCE CHARACTERISTICS
S21 0805 – 100V
IMPEDANCE 0805 – 100V
10000
1000
100
10
0
-10
-20
-30
-40
-50
-60
-70
W2F11A2208AT
W2F11A2208
W2F11A4708
W2F11A1018
W2F11A2218
W2F11A4718
1
W2F11A4708AT
W2F11A1018AT
W2F11A2218AT
W2F11A4718AT
0.1
0.01
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
1.E+10
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
1.E+10
Freq (0.3 MHz – 9 GHz)
Freq (0.3 MHz – 9 GHz)
S21 1206 – 100V
IMPEDANCE 1206 – 100V
10000
1000
100
10
0
-10
-20
-30
-40
-50
-60
-70
1
W3F11A2208
W3F11A4708
W3F11A1018
W3F11A2218
W3F11A2208
W3F11A4708
W3F11A1018
W3F11A2218
0.1
0.01
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
1.E+10
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
1.E+10
Freq (0.3 MHz – 9 GHz)
Freq (0.3 MHz – 9 GHz)
IMPEDANCE 1206 – 50V
S21 1206 – 50V
1000
100
10
0
-10
-20
-30
-40
-50
-60
-70
1
W3F15C2228
W3F15C2228
W3F15C4728
W3F15C1038
W3F15C2238
W3F15C4738
W3F15C4728
W3F15C1038
W3F15C2238
W3F15C4738
0.1
0.01
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
1.E+10
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
1.E+10
Freq (0.3 MHz – 9 GHz)
Freq (0.3 MHz – 9 GHz)
3
REV 01
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
REV 01
Feedthru 0805/1206 Tin/Lead Capacitors
L2F/L3F Series
GENERAL DESCRIPTION
L2F Series
L3F Series
Available in both a standard 0805 and 1206 size, AVX’s line
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.
0805
1206
OUTPUT
SIGNAL LINE - INPUT
GROUND
CAPACITOR VALUES
Part Number
Size
Voltage
100V
100V
100V
100V
100V
50V
Dielectric
NP0
NP0
NP0
NP0
NP0
X7R
Capacitance
L2F11A 220 8ATxx
L2F11A 470 8ATxx
L2F11A 101 8ATxx
L2F11A 221 8ATxx
L2F11A 471 8ATxx
L2F15C 102 8ATxx
L2F15C 222 8ATxx
L2F15C 472 8ATxx
L2F15C 103 8ATxx
L2F15C 223 8ATxx
L2F15C 473 8ATxx
L3F11A 220 8ATxx
L3F11A 470 8ATxx
L3F11A 101 8ATxx
L3F11A 221 8ATxx
L3F11A 471 8ATxx
L3F15C 102 8ATxx
L3F15C 222 8ATxx
L3F15C 472 8ATxx
L3F15C 103 8ATxx
L3F15C 223 8ATxx
L3F15C 473 8ATxx
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206
22pF
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
+50%, -20%
100V
300mA
1000MΩ
<0.6Ω
X7R
Capacitance Tolerance
Voltage Rating
+50%, -20%
50V
Not RoHS Compliant
Current Rating
300mA
1000MΩ
<0.6Ω
Insulation Resistance
DC Resistance
Operating Temperature Range
-55 to +125°C
HOW TO ORDER
B
L
3
F
1
5
C
223
8
A
3
A
Termination
Style
Size
Feedthru Number Voltage* Dielectric Capacitance Capacitance
Failure Rate
Packaging Code
(Reel Size)
Quantity
Code
B = Plated SnPb
2 = 0805
3 = 1206
of
1 = 100V
A = NP0
C = X7R
Code
Tolerance
A = Not Applicable
Elements 5 = 50V
8 = +50/-20%
1 & 2 = 7" Reel
Embossed Tape
3 & 4 = 13" Reel
Embossed Tape
(Pcs./Reel)
F = 1,000
A = 2,000,
4,000 or
*Note: NP0 available in 100V only and X7R available in 50V only.
10,000
5
REV 01
Feedthru 0805/1206 Tin/Lead Capacitors
L2F/L3F 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 0.008ꢀ
(0.049 0.008ꢀ
(0.045 Max.ꢀ
(0.018 0.004ꢀ (0.007 + 0.010 -0.003ꢀ (0.010 0.005ꢀ (0.040 0.004ꢀ (0.009 0.006ꢀ
1206 MM
(in.)
3.20 0.20
(0.126 0.008ꢀ
1.60 0.20
(0.063 0.008ꢀ
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 0.004ꢀ (0.007 + 0.010 -0.003ꢀ (0.015 0.007ꢀ (0.063 0.004ꢀ (0.018 0.006ꢀ
T
P
P
S
W
C
L
RECOMMENDED SOLDER PAD LAYOUT (TYPICAL DIMENSIONS)
T
P
S
W
L
C
0805 MM
(in.)
3.45
(0.136ꢀ
0.51
(0.020ꢀ
0.76
(0.030ꢀ
1.27
(0.050ꢀ
1.02
(0.040ꢀ
0.46
(0.018ꢀ
1206 MM
(in.)
4.54
(0.179ꢀ
0.94
(0.037ꢀ
1.02
(0.040ꢀ
1.65
(0.065ꢀ
1.09
(0.043ꢀ
0.71
(0.028ꢀ
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
6
REV 01
High Current Feedthru Capacitors
W2H 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 feedthru filters can actually replace
discrete L/C filter networks.
• Available in EIA 0805
• 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 080
• Small size – 0805
• Reeling in accordance with EIA-481
HOW TO ORDER
A
W2H1
5
C
473
8
T
3
A
Packaging Code
(Reel Size)
1 & 2 = 7" Reel
Embossed Tape
3 & 4 = 13" Reel
Embossed Tape
Failure
Rate
A = Not
Applicable
Size & Style
W2H1 = 0805
Voltage Dielectric Capacitance
Capacitance
Tolerance
8 = +50/-20%
M = 20%
Terminations
T = Plated Ni & Sn
B = Plated SnPb
Quantity
Code
(Pcs./Reel)
F = 1,000
A = 2,000,
4,000 or
10,000
3 = 25v
5 = 50v
1 = 100v
A = NP0
C = X7R
Code
W = Plated Ni & S
L = Plated SnPb
b
LEAD-FREE COMPATIBLE
COMPONENT
PINOUT CONFIGURATION
Ground
Signal/Vcc
Signal/Vcc
Ground
W2H1 – 0805 Style
7
REV 01
High Current Feedthru Capacitors
W2H
ELECTRICAL PARAMETERS
Insulation Resistance
DC Resistance
1000 MΩ Minimum
<0.150 Ω
Operating Temperature
-55C to +125C
CAPACITOR VALUES
Part Number
Size
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
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%
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
X7R
50V
2A
X7R
50V
1A
X7R
50V
1A
X7R
50V
1A
NP0
100V
100V
100V
100V
100V
0.5A
0.5A
0.5A
0.5A
0.5A
NP0
220pF
NP0
100pF
47pF
22pF
NP0
NP0
PHYSICAL DIMENSIONS AND PAD LAYOUT
L
T
BW
X
C
P
T
W
S
P
S
BL
EW
W
L
W2H1 – 0805 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 0.004ꢀ
0.18 + 0.25 -0.08
(0.007 + 0.010 -0.003ꢀ
0.25 0.13
(0.010 0.005ꢀ
1.02 0.10
(0.040 0.004ꢀ
0.23 0.05
(0.009 0.002ꢀ
NA
(in.) (0.079 0.008ꢀ (0.049 0.008ꢀ (0.045 Max.ꢀ
PAD DIMENSIONS
T
P
S
W
L
C
X
W2H1– 0805 MM
(in.)
3.45
(0.136ꢀ
0.51
(0.020ꢀ
0.76
(0.030ꢀ
1.27
(0.050ꢀ
1.02
(0.040ꢀ
0.46
(0.018ꢀ
NA
8
REV 01
Feedthru 0805/1206 Capacitors
W2F/W3F 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
9
REV 01
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
VCC
R141
100
78L05
C91
Reg
C87
0.022
IN
OUT
GND
0.022
2.2μF
16V
C90
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
10
REV 01
High Current Feedthru Capacitors
W2H Series
APPLICATIONS
Dual Power Switch Filtering
PA Filtering
W2H15C1048AT1A W2H15C1038AT1A
3.3V
5V
3VIN
PCMCIA
Card
VC120630D650
TransGuard
5VIN
I/O Bus
Controller
RF OUT
11
REV 01
Feedthru 0805/1206 Capacitors
W2F/W3F 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-
(1ꢀPractical Design for Electromagnetic Compatibility edited by Rocco F. Ficchi
Hayden Book Company 1978
12
REV 01
Feedthru 0805/1206 Capacitors
W2F/W3F Series
SMT FEEDTHRU CAPACITOR
TERMINOLOGY
W3F15C2228AT High Frequency Analysis
0
-10
-20
-30
-40
-50
-60
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.
-3dB ~ 2.30 MHz
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.
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.
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
Frequency (Hz)
APPLICATION AND SELECTION OF
SMT FEEDTHRU CAPACITOR FILTERS
Figure 3A. Typical Attenuation Graph
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.
30
10
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.
IDC
3
Feedthru
0612
1
0.3
0.1
0.03
1206
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.
0.01
0.1
1
10
100
1000
Frequency, MHz
Figure 3B. Comparison of SMT Capacitor
Frequency Response to Feedthru Filters
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.
13
REV 01
AMERICAS
EUROPE
ASIA-PACIFIC
ASIA-KED
(KYOCERA Electronic Devices)
AVX Greenville, SC
Tel: 864-967-2150
AVX/Kyocera (S) Pte Ltd.,
Singapore
KED Hong Kong Ltd.
Tel: +852-2305-1080/1223
AVX Limited, England
Tel: +44-1276-697000
Tel: +65-6286-7555
AVX S.A.S., France
Tel: +33-1-69-18-46-00
KED Hong Kong Ltd.
Shenzen
Tel: +86-755-3398-9600
AVX/Kyocera, Asia, Ltd.,
Hong Kong
AVX GmbH, Germany
Tel: +49-0811-95949-0
Tel: +852-2363-3303
KED Company Ltd.
Shanghai
Tel: +86-21-3255-1833
AVX/Kyocera Yuhan Hoesa,
South Korea
AVX SRL, Italy
Tel: +39-02-614-571
Tel: +82-2785-6504
KED Hong Kong Ltd.
Beijing
Tel: +86-10-5869-4655
AVX/Kyocera HK Ltd.,
Taiwan
Tel: +886-2-2656-0258
AVX Czech Republic
Tel: +420-57-57-57-521
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Tel: +44-1638-675000
KED Taiwan Ltd.
Tel: +886-2-2950-0268
AVX/Kyocera (M) Sdn Bhd,
Malaysia
Tel: +60-4228-1190
ELCO Europe GmbH
Tel: +49-2741-299-0
KED Korea Yuhan Hoesa,
South Korea
Tel: +82-2-783-3604/6126
AVX/Kyocera International
Trading Co. Ltd.,
Shanghai
AVX S.A., Spain
Tel: +34-91-63-97-197
KED (S) Pte Ltd.
Singapore
Tel: +65-6509-0328
Tel: +86-21-3255 1933
AVX Benelux
Tel: +31-187-489-337
AVX/Kyocera Asia Ltd.,
Shenzen
Tel: +86-755-3336-0615
Kyocera Corporation
Japan
Tel: +81-75-604-3449
AVX/Kyocera International
Trading Co. Ltd.,
Beijing
Tel: +86-10-6588-3528
AVX/Kyocera India
Liaison Office
Tel: +91-80-6450-0715
Contact:
A KYOCERA GROUP COMPANY
http://www.avx.com
S-FTCA0M815-C
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