Multilayer ceramic capacitors
Chip capacitors, MLSC, X7R
Date:
October 2006
Data Sheet
ã
EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet and the
information contained therein without EPCOS’ prior express consent is prohibited.
Multilayer ceramic capacitors
Multilayer serial ceramic capacitor (MLSC)
General
Chip
The MLSC was developed for typical applications with a direct connection to the battery or gener-
ator in the automobile, as it satisfies the requirements of the automobile manufacturers for a series
connection of two capacitors for battery applications in a single component.
It not only represents the only real alternative to the series connection of discrete capacitors, but
also offers advantages over these and other possible solutions, which contain only a single capac-
itor.
Compared with a series circuit made up of conventional ceramic capacitors, it allows the number of
components to be reduced. This reduces the space requirement on the circuit board and shortens
the placement time. Because fewer components are used, the failure probability is additionally re-
duced.
The MLSC is based on proven MLCC technology, but has a more rugged design. This technology
offers highest reliability (ppb rate) on the basis of long field experience. Both undamaged and typi-
cally cracked MLSCs are characterized by a high breakdown voltage and high ESD and pulse
strength.
It may be used at temperatures of up to 150
°
C with consideration of a voltage derating and with
brief temperature peaks of up to 175
°
C without electrical stressing (refer to the Advanced series).
Like the capacitors of the Advanced series, the MLSC is also manufactured to the specifications of
the ppb level assurance system, and a bending strength of 2 mm is assured on the basis of the
rigorous piezoelectric method.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
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Multilayer ceramic capacitors
Multilayer serial ceramic capacitor (MLSC); X7R
Ordering code system
Chip
B37941
X
1
103
K
0
60
Packaging
60
62
70
72
^
^
^
^
cardboard tape, 180-mm reel
blister tape, 180-mm reel
cardboard tape, 330-mm reel
blister tape, 330-mm reel
Internal coding
Capacitance tolerance
K
^
±10%
(standard)
Capacitance,
coded
(example)
103
^
10 · 10
3
pF = 10 nF
104
^
10 · 10
4
pF = 100 nF
223
^
22 · 10
3
pF = 22 nF
50
5
100
1
Rated voltage
Rated voltage [VDC]
Code
Internal coding
“X” indicates MLSC type
Type and size
Chip size
(inch / mm)
0603
/ 1608
0805
/ 2012
Temperature characteristic
X7R
B37931
B37941
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
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Multilayer ceramic capacitors
MLSC; X7R
Features
■
Two series-connected ceramic capacitors
■
Chip
■
■
■
■
■
in a single component
The MLSC thus satisfies the requirements
of the automobile manufacturers for applications
Capacitor 1
on the battery / generator (e.g. clamp 30 or clamp 15)
in a single component.
Reduction of the effects of a
– bending fracture
– placement fracture
– solder-shock crack
thanks to a lower probability of a short circuit.
Evaluation criteria: Insulation resistance >10 k after the following treatment
bending until crack
humidity tests (85
°
C/85% RH, rated voltage), 14 days
The breakdown voltage of MLSCs in the case of a typical bending crack
is still greater than five times the rated voltage.
Both undamaged and cracked MLSCs are capable of fulfilling the requirements
to ISO7637 for 12 V automotive power systems, including load-dump and
jump-start requirements (24 V/1 h and 36 V/1 h).
To AEC-Q200
Capacitor 2
Termination
Solder
KKE0427-P-E
Applications
■
Automobile electronics
– for direct connection to the car battery or generator
– at positions with “stranding potential”
– as RF filters in small motors (e.g. electrically operated windows)
■
Power electronics (e.g. DC/DC converters)
■
Smoothing capacitors (e.g. on the rechargeable battery in mobile equipment)
Cautions
A short circuit cannot be completely excluded. The use of MLSCs does not therefore result in 100%
fail-safe operation, but in the event of a crack the probability of a short circuit can be greatly reduced.
In the event of an untypical (bending) crack formation (e.g. double-sided crack or extreme mounting
crack) and other mechanical or thermal damage to the capacitor, the capacitor may have a low
ohmic state.
Termination
Crack
Solder
KKE0387-F-E
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
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Multilayer ceramic capacitors
MLSC; X7R
Termination
■
For soldering: Nickel barrier termination (Ni)
MLSC
Delivery mode
■
Cardboard and blister tape (blister tape for chip thickness
³
1.2
±
0.1 mm),
180-mm and 330-mm reel available
Electrical data
Temperature characteristic
Max. relative capacitance change
within –55
°
C to +125
°
C
Climatic category (IEC 60068-1)
Standard
Dielectric
Rated voltage
1)
Test voltage
Capacitance range / E series
Dissipation factor (limit value)
Insulation resistance
2)
at + 25
°
C
Insulation resistance
2)
at +125
°
C
Time constant
2)
at + 25
°
C
Time constant
2)
at +125
°
C
Operating temperature range
Ageing
3)
X7R
D
C/C
V
R
V
test
C
R
tan
d
R
ins
R
ins
t
t
T
op
±
15
55/125/56
EIA
Class 2
50, 100
2.5 · V
R
/5 s
1 nF … 100 nF (E6)
< 25 · 10
–3
>10
5
>10
4
>1000
>100
–55 … +125
yes
%
VDC
VDC
M
W
M
W
s
s
°
C
1) Note: No operation on AC line.
2) For C
R
>10 nF the time constant
t
= C · R
ins
is given.
3) Refer to chapter “General technical information”, “Ageing”.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
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