X2Y FILTER & DECOUPLING CAPACITORS
®
X2Y® filter capacitors employ a unique, patented low inductance design featuring two balanced capacitors
that are immune to temperature, voltage and aging performance differences.
These components offer superior decoupling and EMI filtering performance, virtually eliminate parasitics, and
can replace multiple capacitors and inductors saving board space and reducing assembly costs.
152 3000pF 1500pF
222 4400pF 2200pF
472 9400pF 4700pF
.020µF .010µF
.030µF .015µF
.044µF .022µF
.078µF .039µF
.094µF .047µF
0.20µF 0.10µF
0.36µF 0.18µF
103
153
223
393
473
104
184
50
50
50
16
25
25
16
10
0805 (X15)
1206 (X18
NP0
100 100 100 100 100 50
X7R
1210 (X41)
X7R
1410 (X44)
X7R
1812 (X43)
X7R
10
100 100 100 100 100 100 100 50
X7R
NP0
50
100 100 100 100 100 100 100 100 50
X7R
NP0
50
1.0µF
102 2000pF 1000pF
50
2.0µF
940pF 470pF
471
50
105
440pF 220pF
221
50
X7R
0.94µF 0.47µF
200pF 100pF
101
50
474
47pF
94pF
470
50
0.80µF 0.40µF
33pF
66pF
330
50
404
27pF
54pF
270
50
0.66µF 0.33µF
22pF
44pF
220
50
334
10pF
20pF
100
50
0.44µF 0.22µF
100 pF; 1kHz ±50Hz; 1.0±0.2 VRMS
C ≤ 100 pF; 1Mhz ±50kHz; 1.0±0.2 VRMS
TEST CONDITIONS:
OTHER:
1.0kHz±50Hz @ 1.0±0.2 Vrms
CB
See page 79 for additional dielectric specifications.
W
Cross-sectional View
Dimensional View
CB
G
A
EB
T
W
B
L
G
CASE SIZE
EB
0402 (X07)
IN
MM
0603 (X14)
IN
MM
0805 (X15)
IN
MM
1206 (X18)
L
IN
MM
T
1210 (X41)
IN
MM
1410 (X44)
IN
MM
1812 (X43)
IN
MM
L
0.045 ±
0.003
1.143 ±
0.076
0.064 ±
0.005
1.626 ±
0.127
0.080 ±
0.008
2.032 ±
0.203
0.124 ±
0.010
3.150 ±
0.254
0.125 ±
0.010
3.175 ±
0.254
0.140 ±
0.010
3.556 ±
0.254
0.174 ±
0.010
4.420 ±
0.254
W
0.025 ±
0.003
0.635 ±
0.076
0.035 ±
0.005
0.889 ±
0.127
0.050 ±
0.008
1.270 ±
0.203
0.063 ±
0.010
1.600 ±
0.254
0.098 ±
0.010
2.489 ±
0.254
0.098 ±
0.010
2.490 ±
0.254
0.125 ±
0.010
3.175 ±
0.254
T
0.020
max
0.508
max
0.026
max
0.660
max
0.040
max
1.016
max
0.050
max
1.270
max
0.070
max
1.778
max
0.070
max
1.778
max
0.090
max
2.286
max
EB
0.008 ±
0.003
0.203 ±
0.076
0.010 ±
0.006
0.254 ±
0.152
0.012 ±
0.008
0.305 ±
0.203
0.016 ±
0.010
0.406 ±
0.254
0.018 ±
0.010
0.457 ±
0.254
0.018 ±
0.010
0.457 ±
0.254
0.022 ±
0.012
0.559 ±
0.305
CB
0.012 ±
0.003
0.305 ±
0.076
0.018 ±
0.004
0.457 ±
0.102
0.022 ±
0.005
0.559 ±
0.127
0.040 ±
0.005
1.016 ±
0.127
0.045 ±
0.005
1.143 ±
0.127
0.045 ±
0.005
1.143 ±
0.127
0.045 ±
0.005
1.143 ±
0.127
www.johanson dielectrics.com
11
X2Y FILTER & DECOUPLING CAPACITORS
®
THE X2Y® DESIGN - A BALANCED, LOW ESL, “CAPACITOR CIRCUIT”
The X2Y® capacitor design starts with standard 2 terminal MLC capacitor’s opposing electrode sets, A & B, and adds a third electrode set (G) which
surround each A & B electrode. The result is a highly vesatile three node capacitive circuit containing two tightly matched, low inductance capacitors
in a compact, four-terminal SMT chip.
EMI FILTERING:
The X2Y® component contains two shunt or “line-to-ground” Y capacitors. Ultra-low ESL (equivalent
series inductance) and tightly matched inductance of these capacitors provides unequaled high frequency
Common-Mode noise filtering with low noise mode conversion. X2Y® components reduce EMI emissions
far better than unbalanced discrete shunt capacitors or series inductive filters. Differential signal loss is
determined by the cut off frequency of the single line-to-ground (Y) capacitor value of an X2Y®.
POWER BYPASS / DECOUPLING
For Power Bypass applications, X2Ys® two “Y” capacitors are connected in parallel. This doubles the total
capacitance and reduces their mounted inductance by 80% or 1/5th the mounted inductance of similar sized
MLC capacitors enabling high-performance bypass networks with far fewer components and vias. Low ESL
delivers improved High Frequency performance into the GHz range.
GSM RFI ATTENUATION IN AUDIO & ANALOG
GSM handsets transmit in the 850 and 1850 MHz bands using a TDMA pulse
rate of 217Hz. These signals cause the GSM buzz heard in a wide range of audio
products from headphones to concert hall PA systems or “silent” signal errors
created in medical, industrial process control, and security applications. Testing
was conducted where an 840MHz GSM handset signal was delivered to the
inputs of three different amplifier test circuit configurations shown below whose
outputs were measured on a HF spectrum analyzer.
1) No input filter, 2 discrete MLC 100nF power bypass caps.
2) 2 discrete MLC 1nF input filter, 2 discrete MLC 100nF power bypass caps.
3) A single X2Y 1nF input filter, a single X2Y 100nF power bypass cap.
X2Y configuration provided a nearly flat response above the ambient and up to
10 dB imrpoved rejection than the conventional MLCC configuration.
AMPLIFIER INPUT FILTER EXAMPLE
In this example, a single Johanson X2Y® component was used to filter noise at the input of a
DC instrumentation amplifier. This reduced component count by 3-to-1 and costs by over 70%
vs. conventional filter components that included 1% film Y-capacitors.
Parameter
X2Y®
10nF
Discrete
10nF, 2 @ 220 pF
Comments
DC offset shift
< 0.1 µV
< 0.1 µV
Referred to input
Common mode rejection
91 dB
92 dB
Source: Analog Devices, “A Designer’s Guide to Instrumentation Amplifiers (2nd Edition)” by Charles Kitchin and Lew Counts
12
www.johanson dielectrics.com
X2Y FILTER & DECOUPLING CAPACITORS
®
COMMON MODE CHOKE REPLACEMENT
• Superior High Frequency Emissions Reduction
• Smaller Sizes, Lighter Weight
• No Current Limitation
• Vibration Resistant
• No Saturation Concerns
See our website for a detailed application note with component
test comparisons and circuit emissions measurements.
Measured Common Mode Rejection
PARALLEL CAPACITOR SOLUTION
A common design practice is to parallel decade capacitance values to
extend the high frequency performance of the filter network. This causes an
unintended and often over-looked effect of anti-resonant peaks in the filter
networks combined impedance. X2Y’s very low mounted inductance allows
designers to use a single, higher value part and completely avoid the antiresonance problem. The impedance graph on right shows the combined
mounted impedance of a 1nF, 10nF & 100nF 0402 MLC in parallel in RED.
The MLC networks anti-resonance peaks are nearly 10 times the desired
impedance. A 100nF and 47nF X2Y are plotted in BLUE and GREEN. (The
total capacitance of X2Y (Circuit 2) is twice the value, or 200nF and 98nF in this
example.) The sigle X2Y is clearly superior to the three paralleled MLCs.
X2Y HIGH PERFORMANCE POWER BYPASS - IMPROVE PERFORMANCE, REDUCE SPACE & VIAS
Actual measured performance of two high performance SerDes FPGA designs demonstrate how a 13 component X2Y bypass
network significantly outperforms a 38 component MLC network.
For more information see https://johansondielectrics.com/downloads/JDI_X2Y_STXII.pdf
www.johanson dielectrics.com
13
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