Multilayer Ceramic
SMD Feedthru Capacitors

100821-1

IMPORTANT INFORMATION/DISCLAIMER
All product specifications, statements, information and data (collectively, the “Information”) in this datasheet or
made available on the website are subject to change. The customer is responsible for checking and verifying
the extent to which the Information contained in this publication is applicable to an order at the time the order isplaced. All Information given herein is believed to be accurate and reliable, but it is presented without guarantee,
warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KYOCERA AVX’s knowledge of typical operating
conditions for such applications, but are not intended to constitute and KYOCERA AVX specifically disclaims
any warranty concerning suitability for a specific customer application or use.
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The Information is intended for use only by customers who have the requisite experience and capability todetermine the correct products for their application. Any technical advice inferred from this Information orotherwise provided by KYOCERA AVX with reference to the use of KYOCERA AVX’s products is given without
regard, and KYOCERA AVX assumes no obligation or liability for the advice given or results obtained.
Although KYOCERA AVX designs and manufactures its products to the most stringent quality and safety
standards, given the current state of the art, isolated component failures may still occur. Accordingly, customer
applications which require a high degree of reliability or safety should employ suitable designs or othersafeguards (such as installation of protective circuitry or redundancies) in order to ensure that the failure of anelectrical component does not result in a risk of personal injury or property damage.
Unless specifically agreed to in writing, KYOCERA AVX has not tested or certified its products, services ordeliverables for use in high risk applications including medical life support, medical device, direct physicalpatient contact, water treatment, nuclear facilities, weapon systems, mass and air transportation control,
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design or manufacturing process.

Although all product–related warnings, cautions and notes must be observed, the customer should not assume
that all safety measures are indicted or that other measures may not be required.

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
121119– multilayer ceramic smd feedthru capacitors –FEEDTHRU 0805/1206 CAPACITORS
Table of Contents
FEEDTHRU 0805/1206 CAPACITORSW2F/W3F Series, High Current W2H SeriesCommercial, Automotive, High Current, RoHS & SnPb.........................................................................................1
Application Notes..................................................................................................................................................................................................................5

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.

– multilayer ceramic smd feedthru capacitors –FEEDTHRU 0805/1206 CAPACITORSW2F/W3F Series, High Current W2H Series
Commercial, Automotive, High Current, RoHS & SnPb
GENERAL DESCRIPTION

W2F/W2H
SeriesAvailable in both a standard 0805 and 1206 size, KYOCERA AVX’sline 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 highdi/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. KYOCERA AVX FeedThru
filters are AEC Q200 qualified. High reliability screening options,and SnPb termination are available for spacecraft designs.

W3F Series
1206

0805

ELECTRICAL PARAMETERS
Part Number

Case Size(EIA)

Standard

0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206
1206

W2H11A2208ATxx
W2H11A4708ATxx
W2H11A1018ATxx
W2H11A2218ATxx
W2H11A4718ATxx
W2H15C1028ATxx
W2H15C1038ATxx
W2H15C2238ATxx
W2H15C4738ATxx
W2H13C1048ATxx
W2F11A2208ATxx
W2F11A4708ATxx
W2F11A1018ATxx
W2F11A2218ATxx
W2F11A4718ATxx
W2F15C1028ATxx
W2F15C2228ATxx
W2F15C4728ATxx
W2F15C1038ATxx
W2F15C2238ATxx
W2F15C4738ATxx
W3F11A2208ATxx
W3F11A4708ATxx
W3F11A1018ATxx
W3F11A2218ATxx
W3F11A4718ATxx
W3F15C1028ATxx
W3F15C2228ATxx
W3F15C4728ATxx
W3F15C1038ATxx
W3F15C2238ATxx
W3F15C4738ATxx

Standard

High Current

Type

SnPb Termination
FinishL2H11A2208ABxx
L2H11A4708ABxx
L2H11A1018ABxx
L2H11A2218ABxx
L2H11A4718ABxx
L2H15C1028ABxx
L2H15C1038ABxx
L2H15C2238ABxx
L2H15C4738ABxx
L2H13C1048ABxx
L2F11A2208ABxx
L2F11A4708ABxx
L2F11A1018ABxx
L2F11A2218ABxx
L2F11A4718ABxx
L2F15C1028ABxx
L2F15C2228ABxx
L2F15C4728ABxx
L2F15C1038ABxx
L2F15C2238ABxx
L2F15C4738ABxx
L3F11A2208ABxx
L3F11A4708ABxx
L3F11A1018ABxx
L3F11A2218ABxx
L3F11A4718ABxx
L3F15C1028ABxx
L3F15C2228ABxx
L3F15C4728ABxx
L3F15C1038ABxx
L3F15C2238ABxx
L3F15C4738ABxx

Automotive
W2H11A22084Txx
W2H11A47084Txx
W2H11A10184Txx
W2H11A22184Txx
W2H11A47184Txx
W2H15C10284Txx
W2H15C10384Txx
W2H15C22384Txx
W2H15C47384Txx
W2H13C10484Txx
W2F11A22084Txx
W2F11A47084Txx
W2F11A10184Txx
W2F11A22184Txx
W2F11A47184Txx
W2F15C10284Txx
W2F15C22284Txx
W2F15C47284Txx
W2F15C10384Txx
W2F15C22384Txx
W2F15C47384Txx
W3F11A22084Txx
W3F11A47084Txx
W3F11A10184Txx
W3F11A22184Txx
W3F11A47184Txx
W3F15C10284Txx
W3F15C22284Txx
W3F15C47284Txx
W3F15C10384Txx
W3F15C22384Txx
W3F15C47384Txx

Automotive w/ SnPb
Termination Finish
L2H11A22084Bxx
L2H11A47084Bxx
L2H11A10184Bxx
L2H11A22184Bxx
L2H11A47184Bxx
L2H15C10284Bxx
L2H15C10384Bxx
L2H15C22384Bxx
L2H15C47384Bxx
L2H13C10484Bxx
L2F11A22084Bxx
L2F11A47084Bxx
L2F11A10184Bxx
L2F11A22184Bxx
L2F11A47184Bxx
L2F15C10284Bxx
L2F15C22284Bxx
L2F15C47284Bxx
L2F15C10384Bxx
L2F15C22384Bxx
L2F15C47384Bxx
L3F11A22084Bxx
L3F11A47084Bxx
L3F11A10184Bxx
L3F11A22184Bxx
L3F11A47184Bxx
L3F15C10284Bxx
L3F15C22284Bxx
L3F15C47284Bxx
L3F15C10384Bxx
L3F15C22384Bxx
L3F15C47384Bxx

Capacitance(pF)

CapacitanceTolerance

Rated DC
Voltage

Rated
Current(Amps)

Dielectric

22
47
100
220
470
1000
10000
22000
47000
100000
22
47
100
220
470
1000
2200
4700
10000
22000
47000
22
47
100
220
470
1000
2200
4700
10000
22000
47000

+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%
+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%

100V
100V
100V
100V
100V
50V
50V
50V
50V
25V
100V
100V
100V
100V
100V
50V
50V
50V
50V
50V
50V
100V
100V
100V
100V
100V
50V
50V
50V
50V
50V
50V

0.5
0.5
0.5
0.5
0.5
1.0
1.0
1.0
2.0
2.0
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3

NP0
NP0
NP0
NP0
NP0
X7R
X7R
X7R
X7R
X7R
NP0
NP0
NP0
NP0
NP0
X7R
X7R
X7R
X7R
X7R
X7R
NP0
NP0
NP0
NP0
NP0
X7R
X7R
X7R
X7R
X7R
X7R

xx = Packaging and quantity code - see "How To Order" section.
Parameter

High Current Standard

Insulation Resistance (Minimum)
DC ResistanceOperating Temperature1000 MΩ 1000 MΩ
<0.15 Ω<0.60 Ω-55C to +125C

HOW TO ORDER
W

Style

W = Plated Ni & Sn
L = Plated SnPb

3

Size

2 = 0805
3 = 1206

F
Feedthru

F = Feedhtru
H= High Current
Feedthru

1

5

GROUNDC

223

8

Number of Voltage Dielectric Capacitance Capacitance
Elements 1 = 100V A = NP0
CodeTolerance
5 = 50V
3 = 25V

OUTPUT

SIGNAL LINE - INPUT

C = X7R

8 = +50/-20%

A

T

3

A

Failure Rate

Termination

Packaging
Code(Reel Size)

Quantity
Code(Pcs./Reel)

A = Not
Applicable
4 = AUTOMOTIVE

T = Plated Ni & Sn
B* = Plated SnPb
*NotRoHSCompliant

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
100821– multilayer ceramic smd feedthru capacitors –1 = 7" Reel
Embossed Tape3 = 13" Reel
Embossed TapeF = 1,000
A = 2,000,
4,000 or
10,0001

FEEDTHRU 0805/1206 CAPACITORSW2F/W3F Series, High Current W2H Series
Commercial, Automotive, High Current, RoHS & SnPb
Common Ground
Feedthru Pad

L
SFeedthru Pad
CL

X

BL

T

W

EW

BW
Common Ground

DIMENSIONS
0805 MM(in.)
1206 MM
(in.)

L

W

T

2.01 ± 0.20
(0.079 ± 0.008)
3.20 ± 0.20
(0.126 ± 0.008)

1.25 ± 0.20
(0.049 ± 0.008)
1.60 ± 0.20
(0.063 ± 0.008)

1.14 Max.
(0.045 Max.)
1.27 Max.
(0.050 Max.)

BW

BL

EW

X

0.46 ± 0.10
0.18 + 0.25 -0.08
0.25 ± 0.13
1.02 ± 0.10
(0.018 ±0.004) (0.007 + 0.010 -0.003) (0.010 ± 0.005) (0.040 ± 0.004)
0.89 ± 0.10
0.18 + 0.25 -0.08
0.38 ± 0.18
1.60 ± 0.10
(0.035 ± 0.004) (0.007 + 0.010 -0.003) (0.015 ± 0.007) (0.063 ± 0.004)

S
0.23 ± 0.15
(0.009 ± 0.006)
0.46 ± 0.15
(0.018 ± 0.006)

T
P

P

S

C

W

L

RECOMMENDED SOLDER PAD LAYOUT (TYPICAL DIMENSIONS)
0805 MM(in.)
1206 MM
(in.)

T

P

S

W

L

C

3.45
(0.136)
4.54(0.179)0.51(0.020)0.94(0.037)0.76(0.030)1.02(0.040)1.27(0.050)1.65(0.065)1.02(0.040)1.09(0.043)0.46(0.018)0.71(0.028)TYPICAL FEEDTHRU CHIP CAP CONNECTION
Feedthru Chip Component Model

Physical Layout - A

GroundVcc orSignal Out

Vcc orSignal In

Signal Out

Signal In
GroundGroundThe terminals are connected internally side to side.
Left side and right side are connected and front andback are connected internally.

Physical Layout - B

GroundFor Decoupling, the chip is usually surrounded by four
vias, two for Vcc and two for GND.

Vcc

Vcc

For Signal Filtering, the in and out lines need to be
separated on the circuit board.

Ground2

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –FEEDTHRU 0805/1206 CAPACITORSW2F/W3F Series, High Current W2H Series
Commercial, Automotive, High Current, RoHS & SnPbPERFORMANCE CHARACTERISTICS
S21 0805 – 100V

IMPEDANCE 0805 – 100V

0

10000

-10

1000

|Z| (Ohms)

S21 (dB)

-20
-30
-40
-50
-60
-70
1.E+05

W2F11A2208AT
W2F11A4708AT
W2F11A1018AT
W2F11A2218AT
W2F11A4718AT

1.E+06

100
10
1
0.1

1.E+07

1.E+081.E+090.01
1.E+05

1.E+10W2F11A2208
W2F11A4708
W2F11A1018
W2F11A2218
W2F11A4718

1.E+06

Freq (0.3 MHz – 9 GHz)

10000

-10

1000

|Z| (Ohms)

S21 (dB)

-20
-30
-40

-70
1.E+05

W3F11A2208
W3F11A4708
W3F11A1018
W3F11A2218

1.E+06

1.E+10

100
10
1
0.1

1.E+07

1.E+09

IMPEDANCE 1206 – 100V0-60

1.E+08Freq (0.3 MHz – 9 GHz)

S21 1206 – 100V-50

1.E+07

1.E+081.E+090.01
1.E+05

1.E+10W3F11A2208
W3F11A4708
W3F11A1018
W3F11A2218

1.E+06

Freq (0.3 MHz – 9 GHz)

1.E+07

1.E+081.E+091.E+10

1.E+091.E+10Freq (0.3 MHz – 9 GHz)

S21 1206 – 50V

IMPEDANCE 1206 – 50V
1000

0
-10

100

|Z| (Ohms)

S21 (dB)

-20
-30
-40
-50
-60
-70
1.E+05

W3F15C2228
W3F15C4728
W3F15C1038
W3F15C2238
W3F15C4738

1.E+06101
0.1

1.E+07

1.E+081.E+091.E+100.01
1.E+05

W3F15C2228
W3F15C4728
W3F15C1038
W3F15C2238
W3F15C4738

1.E+06

1.E+07

1.E+08Freq (0.3 MHz – 9 GHz)

Freq (0.3 MHz – 9 GHz)The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –3

FEEDTHRU 0805/1206 CAPACITORSW2F/W3F Series, High Current W2H Series
Commercial, Automotive, High Current, RoHS & SnPbPERFORMANCE CHARACTERISTICS
0805 NP0
Current vs. Temperature

Component Temperature (°C)

40.00
220pf

100pf

47pf

35.00

470pf

30.00

25.00

20.00
0.3

0.5

0.7

0.8

1.00

1.20

1.00

1.20

Current (A)0805 X7R
Current vs. Temperature

Component Temperature (°C)

40.00
1000pf35.00

4700pf

2200pf

10nf
22nf

30.00

47nf

25.00

20.00
0.3

0.5

0.7

0.8

1.00

1.20

Current (A)1206 NP0
Current vs. Temperature
Component Temperature (°C)

40.00

20.00

100pf

0.00
0.3

22pf

47pf

0.5

470pf

220pf

0.75

0.87

Current (A)1206 X7R
Current vs. Temperature
Component Temperature (°C)

40.00
1000pf

22,000pf

2200pf
20.00

0.00
0.3

0.5

0.87

0.75

1.00

1.20

Current (A)4

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –FEEDTHRU 0805/1206 CAPACITORS
Application Notes – W2F/W3F Series

Applications
APPLICATIONSFEATURESMARKET SEGMENTS• EMI Suppression• Broadband I/O Filtering• Vcc Line Conditioning

•
•
•
•

•
•
•
•
•
•
•
•
•

Standard EIA Sizes
Broad Frequency Response
Low ESR
8 mm Tape and Reel

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

Block

Block

= Feedthru

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –5

FEEDTHRU 0805/1206 CAPACITORSW2F/W3F Series
VOLTAGE CONDITIONING IN RF AMPLIFIERS
+28V

Q1

R1
D1

C9
RFC1

R4

R6

C25

RFC2

R2
Z1

RF in

C1

+28V

RFC7

Q2

Z2
C2

C18

RFC5
Z6

Z5
C3

C4

C11

Q3

C12

T1

C14

C10

C5

T2

C13

C21

RFC4
RFC3

Filter

Q4

Z3

Z7

Z4
C6

C7

R3

C8

L1

C15

RFC6

C22

Z8

C23

RFC8
= Feedthru

C26

L2

C16
+28V

R5

C20

C24

L3

RF OutPOWER DECOUPLING GAAS FET TRANSISTOR PREAMPLIFIER
C2

S.M. = SILVER MICA
J1
INPUT

FB

5.6
S.M.

L3

C3

RFC1

200
CHIP

G
Q1

S

L2
500 R1
POT

200
C5
CHIP

D

C1
L1

L5

1.5pF
TYPICAL

L4
R2

15
S.M.

U1
TUi MR
IN
OUT
GND
C6
0.1

= Feedthru

51
1/8W

R3

L6

C8

62
1/4W

200
CHIP

C4

J2
OUTPUT

1N914+12/14V
14mA

D2

D1

16V
0.4W

C7
0.1

1000
F.T.

VCC LINE FILTERING ON FREQUENCY CONTROL CIRCUIT
U10
C87
0.022
C85

L3

C80
82

C81
24pF
C83
24

C82
82

2
C84
50

2N5486
Q25
D25
1N914

R136
1M

6

VCC
C91
0.022

Reg
IN
OUT
GND
2.2µF
C90
R138 16V
+
100k
R137
47k
C86
10
R139
100k

= Feedthru

R141
100

C89
0.022
FB1
Q26

T14

To Bilateral
Mixer

40673

R140
100

C88
0.022

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –FEEDTHRU 0805/1206 CAPACITORSW2F/W3F Series
APPLICATIONSPA Filtering

Dual Power Switch Filtering
W2H15C1048AT1A
3.3V

W2H15C1038AT1A

3VIN
PCMCIA
Card

VC120630D650
TransGuard

5VIN

5V

I/O BusController

RF OUT

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –7

FEEDTHRU 0805/1206 CAPACITORSW2F/W2H/W3F Series
EMI REDUCTION THROUGH THE USE OF SMT FEEDTHRU CAPACITORSABSTRACT
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 tosignals/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 EMIT 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 failureof 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 repetitivein 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 caneven be self generated by internal components that generate steep
risetime waveforms of voltage or current.

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.
Signal Trace

Signal Trace

Signal Trace

Signal TraceINPUTOUTPUTINPUTOUTPUT

FEEDTHRU FILTERSMT CAPACITOR

Figure 1. Comparison of Feedthru Capacitors
to Discrete Capacitors
The key difference between the two filtering methods is that the
feedthru has a much lower inductance between the signal line andground 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 themodel for a feedthru and a capacitor (Figure 2).

INPUT

OUTPUTINPUTOUTPUT

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 CAPACITORSKYOCERA 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 andcan be processed in the same end user production methods as

FEEDTHRU FILTER

Figure 2. Comparison of Feedthru Capacitors
to Discrete Capacitors
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 abroad 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 1978

8

SMT CAPACITOR

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –FEEDTHRU 0805/1206 CAPACITORSW2F/W2H/W3F Series
SMT FEEDTHRU CAPACITORTERMINOLOGY

W3F15C2228AT High Frequency Analysis
0
-10
-20

The most important term is DC Resistance. The DC resistance ofthe feedthru is specified since it causes a minor signal attenuation
which designers can calculate by knowing the maximum resistanceof the part.

-30
-40
-50
-60
1.E+05

1.E+06

1.E+07

1.E+08The maximum current capability of the part is also of interest
to designers since the feedthru may be placed in series with thevoltage line.

1.E+09Frequency (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 ofover 100 dB are achievable depending on the complexity and sizeof the filters involved.

30
10
Impedance

S21 (dB)

KYOCERA AVX's feedthru capacitors have additional technicalterminologies relative to standard ceramic capacitors. The reason
for this is due to the series manner in which the feedthru element isconnected to the circuit.

-3dB ~ 2.30 MHz

IDC

3
1

0612

0.3

1206

0.1
0.03
0.01

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 -10 dB.
Because of that, series element EMI reduction is primarily used
where there is a poor ground.

Feedthru

0.1

1

10

100

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 mustbe evaluated for circuit suitability. If there is not a match on voltage,current and DC resistance ratings, the designer must select theclosest available frequency response available on parts that willmeet the design's power spec.

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.

The Important Information/Disclaimer is incorporated in the catalog where these specifications came from oravailable online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
110919– multilayer ceramic smd feedthru capacitors –9

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