Discoidal MLC
Feed-Through Capacitors and Filters
DC Style (US Preferred Sizes)
APPLICATION INFORMATION ON DISCOIDAL
LOWEST CAPACITANCE IMPEDANCES TO GROUND
A discoidal MLC capacitor has very low impedance associated with its ground path since the signal is
presented with a multi-directional path. These electrode paths, which can be as many as 100, allow for low
ESR and ESL which are the major elements in impedance at high frequencies.
The assembled discoidal element or feed-thru allows signal to be fed in through a chassis or bulkhead,
conditioned as it passes through the discoidal, and isolated by the chassis and discoidal from the original
signal. An example of this application would be in an AFT circuit where the AC noise signal would be required
to be stripped from the DC control signal. Other applications include single line EMI/RFI suppression, L-C
filter construction, and coaxial shield bypass filtering.
The shape of the discoidal lends itself to filter construction. The short length allows compact construction
where L-C construction is desired. The size freedom associated with this element allows almost any inside/
outside diameter combination. By allowing the inside diameter to equal the center insulator diameter of a
coaxial signal line and special termination techniques, this device will allow bypass filtering of a floating shield
to ground.
* Discoidal capacitors are available in two (2) temperature coefficients (C0G, X7R) and a variety of shapes
and sizes, the most standard of which appear on pages 102 and 13.
* Custom designed capacitor arrays are available in an unlimited number of configuration with a wide
range of rating voltages (50–2000) and temperature coefficients (NPO, BX, BR, X7R) please see page 121.
For additional information please contact AVX.
INSERTION LOSS
0
-10
OD*
ID
T Max.
These surfaces are metallized
.127 (0.005). minimum wide except
for DC61, DC26 and DC63
where metallized surfaces
are .127 (0.005) maximum.
*Tol. = +.254 (0.010) or 3%, whichever is greater
-
AVX’s DC Series 50V, 100V, 200V, C0G
and X7R parts are capable of meeting
the requirements of MIL-PRF-31033.
-20
-30
SINGLE CHIP
(dB)
-40
-50
-60
-70
-80
0
100
200
300
400
500
600
DISCOIDAL
700
800
900
1000
ELECTRICAL SPECIFICATIONS
Temperature Coefficient
C0G: A Temperature Coefficient - 0 ±30 ppm/°C, -55° +125°C
X7R: C Temperature Coefficient - ±15%, -55° to +125°C
Capacitance Test
(MIL-STD-202 Method 305)
C0G: 25°C, 1.0±0.2 Vrms at 1KHz, for ≤100 pF use 1 MHz
X7R: 25°C, 1.0±0.2 Vrms at 1KHz
Dissipation Factor 25°C
C0G: 0.15% Max @ 25°C, 1.0±0.2 Vrms at 1KHz, for ≤100 pF use 1 MHz
X7R: 2.5% Max @ 25°C, 1.0±0.2 Vrms at 1KHz
Insulation Resistance 25°C
(MIL-STD-202 Method 302)
C0G and X7R: 100K MΩ or 1000 MΩ-μF, whichever is less.
f (MHz)
Insulation Resistance 125°C
(MIL-STD-202 Method 302)
C0G and X7R: 10K MΩ or 100 MΩ-μF, whichever is less.
Dielectric Withstanding Voltage 25°C
(Flash Test)*
C0G and X7R: 250% rated voltage for 5 seconds with 50 mA max
charging current. 500V rated units will be tested at 750 VDC
Life Test
(1000 hrs)
C0G and X7R: 200% rated voltage at +125°C
(500 Volt units @ 600 VDC)
Moisture Resistance
(MIL-STD-202 Method 106)
C0G, X7R: Ten cycles with no voltage applied.
Thermal Shock
(MIL-STD-202 Method 107, Condition A)
Immersion Cycling
(MIL-STD-202 Method 104, Condition B)
HOW TO ORDER
DC61
5
A
561
K
A
Test
Level
A = Standard
Not RoHS Compliant
5
1
06
AVX
Voltage Temperature
Style
50V = 5
Coefficient
See Pages 100V = 1
C0G = A
119-120 200V = 2
X7R = C
500V = 7
Capacitance Code
Capacitance
(2 significant digits
Tolerance
+ no. of zeros)
C0G: J = ±5%
Examples:
K = ±10%
M = ±20%
10 pF = 100
X7R: K = ±10%
100 pF = 101
M = ±20%
1,000 pF = 102
22,000 pF = 223
220,000 pF = 224
Termination
Inside
Maximum
5 = Silver
Diameter
Thickness
(AVX Standard) See Pages 04 = 1.02 (0.040)
A = Unterminated 117-119 06 = 1.52 (0.060)
7 = SnNi w/Aμ Sputter
10 = 2.54 (0.100)
(100μ inches)
For dimensions, voltages or values not specified, please consult factory.
118
Custom Discoidal Arrays
Custom Applications requiring planar capacitor arrays designed to
customer specific schematic including unique shapes, sizes, hole /
pin configurations, multiple capacitor values, internal &/or external
grounds, and more.
APPLICATIONS
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•
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•
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Implantable Medical
Military
Aerospace
EMI Filters Assembly
EMI Filter Arrays
PRODUCTS
These capacitor arrays form the basis for many custom filter assem-
blies. For full detail of these options, please follow the link below to
our EMI filter master catalog.
http://www.avx.com/docs/masterpubs/emift.pdf
BENEFITS
•
•
•
•
•
A custom designed filter bracket will help:
To reduce your yield losses
To eliminate filter rework in assemblies
To reduce system assembly costs
To minimize your inventory
121
嵌入式系统
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