255D
Vishay Sprague
Organic Polymer, Low ESR, Tantalum Capacitors
Commercial, Surface Mount Capacitors for
Switch Mode Power Supplies and Converters
FEATURES
• Conductive polymer cathode technology
• Low ESR
• No-ignition failure mode
• EIA standard case sizes
• 100% surge current tested
PERFORMANCE CHARACTERISTICS
Operating Temperature:
- 55°C to + 105°C
Capacitance Range:
100µF to 330µF
Capacitance Tolerance:
±
20% standard
Voltage Rating:
4WVDC to 10WVDC
DIMENSIONS
in inches [millimeters]
L
W
H
TH Min.
Tw
P
CASE
B
EIA
3528
L
0.138
±
0.008
[3.5
±
0.2]
0.287
±
0.012
[7.3
±
0.3]
0.287
±
0.012
[7.3
±
0.3]
W
0.110
±
0.008
[2.8
±
0.2]
0.170
±
0.012
[4.3
±
0.3]
0.170
±
0.012
[4.3
±
0.3]
H
0.075
±
0.008
[1.9
±
0.2]
0.110
±
0.012
[2.8
±
0.3]
0.076 max
[1.9 max]
P
0.031
±
0.012
[0.8
±
0.3]
0.051
±
0.012
[1.3
±
0.3]
0.051
±
0.012
[1.3
±
0.3]
Tw
0.087
±
0.004
[2.2
±
0.1]
0.095
±
0.004
[2.4
±
0.1]
0.015
±
0.012
[2.4
±
0.1]
TH(Min.)
0.028
[0.7]
0.039
[1.0]
0.039
[1.0]
D
734331
V
734319
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2
Document Number: 40052
Revision 02-Mar-04
255D
Vishay Sprague
ORDERING INFORMATION
255D
227
X0
004
D
2
TERMINATION
2 = Solderable
coating.
Standard.
MODEL CAPACITANCE
This is expressed
in picofarads. The first
two digits are the
significant figures.
The third is the
number of zeros to
follow.
CAPACITANCE DC VOLTAGE RATING CASE CODE
TOLERANCE
@ + 85°C
X0 =
±
20%
This is expressed
in volts. To
complete the
three-digit block,
zeros precede the
voltage rating. A
decimal point is
indicated by an "R"
(6R3 = 6.3 volts).
See Ratings
and Case
Codes Table.
_
REEL SIZE AND
PACKAGING
T
= Tape and
reel*
7" [178mm] reel
W =13" [330mm]
reel
*Cathode nearest
sprocket hole.
040
ESR VALUE
IN mΩ
Note: Preferred Tolerance and Reel size are in bold.
Last three characters designate ESR max. Limit in milliohms.
RATINGS AND CASE CODES
µ
F
100
150
220
330
*Preliminary values, contact factory for availability.
B*
V*
D, V*
D*
3V
4V
6.3V
V*
D, V*
10V
D
STANDARD RATINGS
CAPACITANCE
(
µ
F)
CASE
CODE
PART
NUMBER
MAX
DCL
@ +25
°
C
MAX DF
@ + 25
°
C
MAX ESR
@ 100K Hz
(m
Ω
)
MAX RIPPLE
100K Hz
IRMS
(AMPS)
1.1*
1.9*
2.2*
2.0
2.0
1.9
2.2*
1.9*
1.7
2.0
2.2*
1.8*
1.9*
1.51
1.7
3WVDC @ + 85
°
C, 2.4WVDC @ + 105
°
C SURGE = 3.9V @ + 85
°
C, 3.3V @ + 105
°
C
150*
B*
255D157X0003B2_070*
45*
8*
70*
4WVDC @ + 85
°
C, 3.3WVDC @ + 105
°
C, SURGE = 5.2V @ + 85
°
C, 4.3V @ + 105
°
C
150*
V*
255D157X0004V2_T040*
60*
8*
40*
150*
V*
255D157X0004V2_T025*
60*
8*
25*
220
D
255D227X0004D2_T055
88
8
55
220
D
255D227X0004D2_T045
88
8
45
220
D
255D227X0004D2_T040
88
8
40
220*
V*
255D227X0004V2_T025*
88*
8*
25*
6.3WVDC @ + 85
°
C, 5WVDC @ + 105
°
C, SURGE = 8V @ + 85
°
C, 6.5V @ +105
°
C
100*
V*
255D107X06R3V2_T035*
63*
8*
35*
150
D
255D157X06R3D2_T055
95
8
55
150
D
255D157X06R3D2_T045
95
8
45
150*
V*
255D157X06R3V2_T025*
95*
8*
25*
150*
V*
255D157X06R3V2_T040*
95*
8*
40*
330*
D*
255D337X06R3D2_T040*
208*
12*
40*
10WVDC @ + 85
°
C, 8WVDC @ + 105
°
C, SURGE = 13V @ + 85
°
C, 8V @ +105
°
C
100
D
255D107X0010D2_T065
100
8
65
100
D
255D107X0010D2_T050
100
8
50
*Preliminary values, contact factory for availability.
Document Number: 40052
Revision 02-Mar-04
www.vishay.com
3
255D
Vishay Sprague
PERFORMANCE CHARACTERISTICS
1.
Operating Temperature:
Capacitors are designed to
operate over the temperature range of - 55°C to
+105°C.
5.
Capacitance Change With Temperature:
The
capacitance change with temperature shall not exceed
the following percentage of the capacitance measured
at + 25°C: at
- 55°C
±2
0%
+ 85°C
±2
0%
+ 105°C
±3
0%
1.1
Capacitors may be operated to + 105°C with voltage
derating to 0.8 times the + 85°C rating.
+ 85
°
C
WORKING
VOLTAGE
(V)
4.0
6.3
10.0
SURGE
VOLTAGE
(V)
5.2
8.0
13.0
+ 105
°
C RATING
WORKING
VOLTAGE
(V)
3.3
5.0
8.0
SURGE
VOLTAGE
(V)
4.3
6.5
10.4
6.
Dissipation Factor:
The dissipation factor, determined
from the expression 2πfRC, shall not exceed values listed
in the Standard Ratings Table.
2.
DC Working Voltage:
The DC working voltage is the
maximum operating voltage for continuous duty at the
rated temperature.
6.1
Measurements shall be made by the bridge method at,
or referred to, a frequency of 120Hz and a temperature
of + 25°C.
7.
3.
Surge Voltage:
The surge DC rating is the maximum
voltage to which the capacitors may be subjected un-
der any conditions, including transients and peak ripple
at the highest line voltage.
3.1 Surge Voltage Test:
Capacitors shall withstand the
surge voltage applied in series with a 33 ohm
±
5%
resistor at the rate of one-half minute on, one-half minute
off, at + 85°C, for 1000 successive test cycles.
3.2
Following the surge voltage test, the dissipation factor
shall meet the initial requirements; the capacitance shall
not have changed more than
±
20%. The leakage cur-
rent shall not exceed 150% of the initial value.
Leakage Current:
Capacitors shall be stabilized at the
rated temperature for 30 minutes. Rated voltage shall
be applied to capacitors for 5 minutes using a steady
source of power (such as a regulated power supply) with
1000 ohm resistor connected in series with the capaci-
tor under test to limit the charging current. Leakage cur-
rent shall then be measured.
7.1 At + 25
°
C,
the leakage current shall not exceed the value
listed in the Standard Ratings Table.
7.2 At + 85
°
C,
the leakage current shall not exceed 10 times
the value listed in the Standard Ratings Table.
7.3 At + 105
°
C,
the leakage current , shall not exceed 10
times the value listed in the Standard Ratings Table.
4.
Capacitance Tolerance:
The capacitance of all capaci-
tors shall be within the specified tolerance limits of the
normal rating.
8.
ESR
4.1
Capacitance measurements shall be made by means
of polarized capacitance bridge. The polarizing voltage
shall be of such magnitude that there shall be no rever
sal of polarity due to the AC component. The maximum
voltage applied to capacitors during measurement shall
be 2 volts rms at 120Hz at + 25°C. If the AC voltage
applied is less than one-half volt rms, no DC bias is re-
quired. Accuracy of the bridge shall be within
±
2%.
8.1 ESR (Equivalent Series Resistance)
shall not exceed
the values listed in the Ratings Table. Measurement shall
be made by the bridge method at a frequency of 100kHz
and a temperature of + 25°C.
9.
Life Test:
Capacitors shall withstand rated DC voltage
applied at + 85°C for 1000 hours.
9.1
Following the life test, the dissipation factor shall not
exceed 1.5 times the initial requirement; the capacitance
change shall not exceed
±20%;
the leakage current shall
not exceed 0.1 CV (3uA).
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Document Number: 40052
Revision 02-Mar-04
255D
Vishay Sprague
PERFORMANCE CHARACTERISTICS
(Continued)
10. Solderability:
Capacitors will meet the solderability
requirements of (MIL-STD-202, method 208),
ANSI/J-STD-002, Test B.
11.
Resistance to Solder Heat:
Capacitors will with stand
reflow soldering @ + 240°C + 5°C for 10 seconds max.
Capacitors should be allowed to remain at ambient
conditions for a period of up to 24 hours prior to
electrical measurements.
14 Humidity Test:
Capacitors shall withstand 500 hours at
+ 60°C, 90% to 95% relative humidity, with no voltage
applied.
14.1
Following the humidity test, capacitance change shall
not exceed -20% to + 40% of the initial value, dissipation
factor shall not exceed 150% of the initial requirement;
leakage current shall not exceed 0.1CV (9uA).
11.1
Following the resistance to solder heat test,
capacitance, be within
±
20% of the initial value, the
dissipation factor and the DC leakage current shall not
exceed the initial value.
12. Terminal Strength:
Per IEC-384-3, minimum of 3N
shear force.
13. Flammability:
Encapsulant materials meet UL94 VO
with an oxygen index of 32%.
GUIDE TO APPLICATION
1.
A-C Ripple Current:
The maximum allowable ripple
current shall be determined from the formula:
I
rms
=
where,
P = Power Dissipation in Watts @ + 25°C as given in
the table in Paragraph Number 2.4 (Power
Dissipation).
R
ESR
=The capacitor Equivalent Series Resistance at the
specified frequency.
2.
A-C Ripple Voltage:
The maximum allowable ripple
voltage shall be determined from the formula:
V
rms
=
or, from the formula:
V
rms
= I
rms
x Z
where,
P = Power Dissipation in Watts @ + 25°C as given in
the table in Paragraph Number 5 (Power
Dissipation).
R
ESR
=The capacitor Equivalent Series Resistance at the
specified frequency.
Z = The capacitor impedance at the specified frequency.
2.1
The sum of the peak AC voltage plus the DC voltage
shall not exceed the DC voltage rating of the capacitor.
3.
P
R
ESR
2.4
P
R
ESR
2.2
The sum of the negative peak AC voltage plus the
applied DC voltage shall not allow a voltage reversal
exceeding 10% of the DC working voltage at + 25°C.
Temperature Derating:
If these capacitors are to be
operated at temperatures above + 25°C, the
permissible rms ripple current or voltage shall be
calculated using the derating factors as shown:
TEMPERATURE
+25°C
+ 85°C
+ 105°C
DERATING FACTOR
1.0
0.9
0.4
2.3
Power Dissipation:
Power dissipation will be affected
by the heat sinking capability of the mounting surface.
Non-sinusoidal ripple current may produce heating
effects which differ from those shown. It is important
that the equivalent
Irms
value be established when
calculating permissible operating levels. (Power
Dissipation calculated using +25°C temperature rise).
CASE CODE
MAXIMUM PERMISSIBLE
POWER DISSIPATION
@ + 25C (Watts) IN FREE AIR
0.085
0.150
0.125
B
D
V
Reverse Voltage:
These capacitors are capable of
withstanding peak voltages in the reverse direction
equal to 10% of the DC rating at + 25°C, 5% of the DC
rating at + 85°C and 1% of the DC rating at +105°C.
www.vishay.com
5
Document Number: 40052
Revision 02-Mar-04
255D
Vishay Sprague
GUIDE TO APPLICATION
4.
Recommended derating guidelines:
APPLICATION VOLTAGE
(V)
3.2
5.0
8.0
RECOMMENDED
CAPACITOR VOLTAGE
RATING (V)
4.0
6.3
10.0
8.
5.
Printed Circuit Board Materials:
The 255D is
compatible with commonly used printed circuit board
materials (alumina substrates, FR4, FR5, G10, PTFE-
fluorocarbon and porcelainized steel).
Recommended Mounting Pad Geometries:
Proper
mounting pad geometries are essential for successful
solder connections. These dimensions are highly
process sensitive and should be designed to minimize
component rework due to unacceptable solder joints.
The dimensional configurations shown are the
recommended pad geometries for both wave and reflow
soldering techniques. These dimensions are intended
to be a starting point for circuit board designers and
may be fine tuned if necessary based upon the
peculiarities of the soldering process and/or circuit
board design.
REFLOW SOLDER PADS*
in inches [millimeters)
6.
6.1
Attachment:
Solder Paste:
The recommended thickness of the
solder paste after application is .007"
±
.001" [.178mm
±
0.025mm]. Care should be exercised in selecting
the solder paste. The metal purity should be high as
practical. The flux (in the paste) must be active enough
to remove the oxides formed on the metallization prior
to the exposure to soldering heat. In practice this can
be aided by extending the solder preheat time at
temperatures below the liquidous of the solder.
Soldering:
Capacitors can be attached by
conventional soldering techniques - vapor phase,
infrared reflow, wave soldering and hot plate methods.
The Soldering Profile chart shows maximum
recommended mended time/temperature conditions for
soldering. Attachment with a soldering iron is not
recommended due to the difficulty of controlling
temperature and time at temperature. If hand soldering
is necessary, the soldering iron must never come in
contact with the capacitor.
Case
Code
B
D
V
B
D
C
E
A
6.2
Width
(A)
0.061
[1.54]
0.118
[3.0]
0.118
[3.0]
Pad
Metallization
(B)
0.085
[2.15]
0.106
[2.70]
0.106
[2.70]
Separation
(C)
0.065
[1.65]
0.175
[4.45]
0.175
[4.45]
9.
REFLOW SOLDERING PROFILE
Temperature Deg. Centigrade
300
250
200
150
100
50
0
0
50
100
150
200
250
130
°
C Typical
240
°
C Typical
300
250
200
150
100
50
0
Time (Seconds)
Cleaning (Flux Removal) After Soldering:
The 255D
is compatible with all commonly used solvents such as
TES, TMS, Prelete, Chlorethane, Terpene and aqueous
cleaning media. However, CFC/ODS products are not
used in the production of these devices and are not
recommended. Solvents containing methylene chloride
or other epoxy solvents should be avoided since these
will attack the epoxy encapsulation material.
When using ultrasonic cleaning, the board may
resonate if the output power is too high. This vibration
can cause cracking or a decrease in the adherence-
of the termination. DO NOT EXCEED 9W/L @ 40kHz
for 2 minutes.
9.1
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Document Number: 40052
Revision 02-Mar-04
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