28
X7R
Surface Mount Chip Capacitors
10pF
12
15
18
22
27
33
39
47
56
68
82
100pF
120
150
180
220
270
330
390
470
560
680
820
1.0nF
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
12
15
18
22
27
33
39
47
56
68
82
100
120
150
180
220
270
330
390
470
560
680
820
1.0µF
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
12
15
Capacitance
0805
1206
100V
25V
50/63V
16V
25V
50/63V
100V
16V
1210
16V
25V
0603
100V
50/63V
X7R
100V
50/63V
25V
16V
200V
200V
200V
200V
500V
500V
630V
1KV
1KV
2KV
500V
630V
250V
250V
250V
250V
2KV
1808
1KV
2KV
3KV
630V
500V
250V
MLCC’s are widely used in electronic circuit design for a multitude of
applications. Their small package size, technical performance and
suitability for automated assembly makes them the component of
choice for the specifier.
However, despite the technical benefits, ceramic components are brittle
and need careful handling on the production floor. In some
circumstances they may be prone to mechanical stress damage if not
used in an appropriate manner. Board flexing, depanelisation,
mounting through hole components, poor storage and automatic
testing may all result in cracking.
Careful process control is important at all stages of circuit board
assembly and transportation - from component placement to test and
packaging. Any significant board flexing may result in stress fractures
Polymer Termination - a lead free termination
in ceramic devices that may not always be evident during the board
assembly process. Sometimes it may be the end customer who
finds out - when equipment fails!
Capacitor Body and Electrodes
Termination
Solder Fillet
Substrate
Force
Crack Initiation
Fig 1. Typical Mechanical Crack
29
Surface Mount Chip Capacitors
X7R
X7R
10pF
12
15
18
22
27
33
39
47
56
68
82
100pF
120
150
180
220
270
330
390
470
560
680
820
1.0nF
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
12
15
18
22
27
33
39
47
56
68
82
100
120
150
180
220
270
330
390
470
560
680
820
1.0µF
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
12
15
notes
Shown above are standard and high voltage ranges of X7R chip capacitors
which are available with FlexiCapTM terminations. Please refer to our sales
office if you require other products in our range with this new termination.
For all other mechanical and electrical details please refer to the relevant
sections of this catalogue.
For ordering information see page 30.
With traditional termination materials and assembly, the chain of
materials from bare PCB to soldered termination, provides no
flexibility. In circumstances where excessive stress is applied - the
weakest link fails. This means the ceramic itself, which may fail
short circuit.
Syfer has the solution -
FlexiCapTM has been developed as a result of listening to customers’
experiences of stress damage to MLCC’s from many manufacturers,
often caused by variations in production processes.
Our answer is a proprietary flexible epoxy polymer termination
material, that is applied to the device under the usual nickel barrier
finish. FlexiCapTM will accommodate a greater degree of board
bending than conventional capacitors.
Fired ceramic
dielectric
FlexiCap
TM
termination
base
Intermediate
nickel layer
Tin outer
layer
Metal
electrodes
Fig 2. FlexiCap
TM
MLCC cross section
16V
25V
50/63V
100V
200V
1812
1KV
2KV
3KV
630V
500V
250V
2220
16V
25V
50/63V
100V
200V
3KV
500V
630V
1KV
2KV
250V
2225
50/63V
100V
200V
25V
16V
250V
3KV
2KV
1KV
630V
500V
4KV
3KV
2KV
1KV
3640
630V
500V
30
Surface Mount Chip Capacitors
Application Notes
Summary of PCB bend test results
The bend tests conducted have proved that the FlexiCapTM
termination withstands a greater level of mechanical stress before
mechanical cracking occurs.
Typical examples:
Product Mean bend Mean bend Improvement
(mm) (mm) with
Standard Term. FlexiCapTM FlexiCapTM
0603 X7R 1.6 6.4 + 400%
0805 X7R 3.6 6.3 + 75%
1206 X7R 3.4 6.4 + 88%
1812 X7R 3.2 6.0 + 88%
2220 X7R 3.2 6.1 + 91%
Application Notes
FlexiCapTM may be handled, stored and transported in the same
manner as standard terminated capacitors. The requirements for
mounting and soldering FlexiCapTM are the same as for standard
SMD capacitors.
For customers currently using standard terminated capacitors there
should be no requirement to change the assembly process when
converting to FlexiCapTM.
Based upon board bend tests in accordance with IEC 60384-1 the
amount of board bending required to mechanically crack a polymer
terminated capacitor is significantly increased compared with
standard terminated capacitors.
It must be stressed however, that capacitor users must not assume
that the use of FlexiCapTM terminated capacitors will totally eliminate
mechanical cracking. Good process controls are still required for this
objective to be achieved.
notes
1. For details of the FlexiCap™ range see pages 28/29.
Picture taken at 1,000x magnification using a SEM to demonstrate the fibrous
nature of the FlexiCapTM termination that absorbs increased levels of mechanical
stress.
benefits
The benefit to the user is to facilitate a wider process window -
giving a greater safety margin and substantially reducing the typical
root causes of mechanical stress cracking.
FlexiCapTM may be soldered using your traditional wave or reflow
solder techniques and needs no adjustment to equipment or current
processes.
Syfer has delivered millions of FlexiCapTM components and during
that time has collected substantial test and reliability data, working
in partnership with customers world wide, to eliminate mechanical
cracking.
Ordering Information
0805
Type No
Chip Size
Y
Termination
Y = FlexiCapTM
100
Voltage
016 =16V
025 =25V
050 = 50V
063 = 63V
100 = 100V
200 = 200V
250 = 250V
500 = 500V
630 = 630V
1K0 =1kV
2K0 =2kV
3K0 =3kV
4K0 =4kV
5K0 =5kV
0101
Capacitance
First digit - 0
Second digit - First significant
figure of
capacitance value
Third digit - Second significant
figure of
capacitance value
Fourth digit - Number of zeros
following.
For values that do not fit the
model above, insert the
capacitance code letter for the
decimal point
e.g. 13N6 = 13.6nF
J
Tolerance
Stable class
J=±5%
K = ±10%
M = ±20%
X
Dielectric
X = X7R
T
Packaging
T =178mm
(7”) reel
R =330mm
(13”) reel
B =Bulk pack
tubs
Suffix Code
Used for
specific
customer
requirements
© Copyright/Design right, Syfer Technology Limited, 2003.
FlexiCapTM is a registered trade mark of Syfer Technology Limited.