WET TANTALUM CAPACITORS
HERMETICALLY SEALED - TANTALUM CASES
DSCC 93026
Wet tantalum capacitors
Hermetically sealed tantalum cases
High capacitance
Very high ripple current
Axial leads
Polarized
ELECTRICAL AND CLIMATIC CHARACTERISTICS
DSCC 93026
Detail specification
Operating temperature
Capacitance range
Tolerance
Voltage range
Max. capacitance change –55°C
Max. capacitance change +85°C
Max. capacitance change +125°C
Max. impedance at 120Hz –55°C
Max. leakage current at +25°C
Max. leakage current at +85°C / +125°C
Max. ESR at 120Hz +25°C
Max. ripple current 40kHz +85°C
Reverse voltage
Max. surge voltage at +85°C
DWG NO. 93026
–55°C +125°C
10µF
1800µF
±10% - ±20%
25V
125V
see table
see table
see table
see table
see table
see table
see table
see table
No continuous Reverse voltage.
Reverse voltage is acceptable under some conditions: U
REV
≤ 1,5 V, It ≤ 0,05 A second and repetition rate < 10Hz
1,15 x U
R
DIMENSIONS
(mm)
Case
(code)
T1
T2
T3
T4
Without
insulating sleeve
D
±0,41
4,78
7,14
9,52
9,52
L
+0,79
–0,41
With
insulating sleeve
D max.
5,56
7,92
10,31
10,31
E
Lead length
E
±6,35
38,10
57,15
57,15
57,15
E
0.64
±0,05
D
6.35 max.
L
11,51
16,28
19,46
26,97
PACKAGING, CONSTRUCTION:
see general characteristics
HOW TO ORDER
EXXELIA PN
Model code
93026
Dash Number
-48
Tolerance code
K
K
= ±10%
M
= ±20%
Insulating sleeve
S
U
= Without
S
= With
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HERMETICALLY SEALED - TANTALUM CASES
WET TANTALUM CAPACITORS
DSCC 93026
STANDARD RATINGS - ELECTRICAL CHARACTERISTICS
Capacitance
120Hz
+25°C
(µF)
Capacitance maximum change
Case
(code)
Dash
Number
–55°C
(%)
–42
–65
–70
–75
–38
–65
–70
–72
–25
–50
–50
–58
–25
–40
–60
–58
–25
–35
–45
–55
–18
–30
–35
–40
–15
–25
–35
–35
+85°C
(%)
+125°C
(%)
Max.
Impedance
120Hz
–55°C
(Ω)
Max. I leak
+25°C
(µA)
+85°C
+125°C
(µA)
5
10
20
25
5
10
25
35
5
10
25
40
5
10
25
40
5
10
30
50
5
10
25
50
5
10
25
50
Irms Max.
40kHz
+85°C
(mA)
Max. ESR
120Hz
+25°C
(Ω)
120
560
1200
1800
100
470
1000
1500
68
220
470
680
ST79
47
150
390
560
33
110
330
470
ST79
15
68
150
220
10
47
100
150
T1
T2
T3
T4
T1
T2
T3
T4
T1
T2
T3
T4
T1
T2
T3
T4
T1
T2
T3
T4
T1
T2
T3
T4
T1
T2
T3
T4
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
Rated voltage (+85°C) 25 V - Derated voltage (+125°C) 15 V
+8
+12
25
1
+10
+15
12
2
+12
+18
7
5
+12
+20
7
6
Rated voltage (+85°C) 30 V - Derated voltage (+125°C) 20 V
+8
+12
25
1
+10
+18
15
2
+10
+18
7
7
+10
+20
6
12
Rated voltage (+85°C) 50 V - Derated voltage (+125°C) 30 V
+8
+15
35
1
+8
+15
17,5
2
+8
+15
10
3
+10
+20
8
5
Rated voltage (+85°C) 60 V - Derated voltage (+125°C) 40 V
+8
+12
44
1
+8
+15
20
2
+8
+15
15
3
+8
+15
10
5
Rated voltage (+85°C) 75 V - Derated voltage (+125°C) 50 V
+5
+9
66
1
+6
+10
24
2
+6
+10
12
3
+6
+10
12
5
Rated voltage (+85°C) 100 V - Derated voltage (+125°C) 65 V
+3
+10
125
1
+4
+12
37
2
+6
+12
22
3
+6
+12
15
5
Rated voltage (+85°C) 125 V - Derated voltage (+125°C) 85 V
+3
+10
175
1
+5
+12
47
2
+5
+12
35
3
+6
+12
20
5
1250
2100
2600
3100
1200
1800
2500
3000
1050
1800
2100
2750
1050
1650
2100
2750
1050
1650
2100
2750
1050
1650
2100
2750
1050
1650
2100
2750
1,3
0,83
0,65
0,5
1,3
0,85
0,7
0,6
1,5
0,9
0,75
0,7
2,0
1,1
0,9
0,8
2,5
1,3
1,0
0,9
3,5
2,1
1,6
1,2
5,5
2,3
1,8
1,6
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WET TANTALUM CAPACITORS
HERMETICALLY SEALED - TANTALUM CASES
Electrical characteristics
CAPACITANCE
The capacitance is defined by a rated value (C
R
, indicated on the capacitor) and
a tolerance (generally ±20%).
The capacitance is measured at a 100Hz or at a 120Hz frequency under a 0,1
to 1 V
AC
voltage and a 2,1 to 2,5 V bias (or 9 to 10 V for U
R
≥ 100 V).
At room temperature, it must be in the range defined by the rated value and
the tolerance.
Capacitance change vs temperature: see typical curves below. Maximum
changes are given, for each type, on the data sheets.
TOLERANCE (ON RATED CAPACITANCE)
It defines, with the rated capacitance, the range in which the capacitance value
must be at room temperature.
e.g.:
Rated capacitance: 100µF
Tolerance: 20%
The measured capacitance must be between:
100 - (20% of 100) = 80µF and 100 + (20% of 100) = 120µF
The standard tolerance for tantalum capacitors is 20%.
CAPACITANCE CHANGE VS TEMPERATURE
±20%
1
0.8
1.2
±20%
1.5
1.8
±20%
2.2
2.7
±20%
3.3
3.9
±20%
4.7
5.6
±20%
6.8
8.2
+30%
+20%
0%
–20%
–40%
–60%
–80%
C/C
–50
–30 –10 0
20
40
60
80
100 120
T (°C)
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HERMETICALLY SEALED - TANTALUM CASES
WET TANTALUM CAPACITORS
Electrical characteristics
DIRECT DC VOLTAGE
The rated voltage (U
R
),
indicated on the capacitor, is the maximum DC voltage
which can be applied continuously between –55°C and +85°C.
For the types which can be used up to 125°C, the voltage must be derated
between +85°C and +125°C according to the following curve.
LEAKAGE CURRENT
Leakage current is the residual current which flows through the capacitor
after the charging time, under rated voltage. It is measured after a time not
exceeding 5 minutes and is given in µA.
It is equivalent to the insulation resistance of the capacitor and it must be as
low as possible.
Maximum leakage current is a function of capacitance and rated voltage values
and is given, for each type, in the data sheets.
U
R
0. 8
0. 6
0. 4
0.2
LEAKAGE CURRENT CHANGE VS APPLIED VOLTAGE
U
C
= 66% U
R
1
-50 -4 0 -30 -20 -10
0
10
20 30 40
50
60 70
80 90 100 110 120
T (°C)
0.5
0.4
0.3
For the types which can be used up to 200°C, the voltage must be derated
between +85°C and +200°C according to the following curve.
U
RC
140
120
100
80
60
40
20
0
50
60
70
80
90
100 110
120 130
140 150
160
170
180 190
200
0.2
0.1
Multiplier of leakage current
0.05
0.04
0.03
0.02
°C
0.01
0
10
20
30
40
50
60
70
80
90 100
% U
R
- Percentage of rated voltage
The category voltage (U
C
)
is consequently the maximum DC voltage which can
be applied continuously at +125°C.
The surge voltage
is the maximum voltage which can be applied for short
periods.
It is given for each type in the data sheet and is generally equal to 1,15 times
U
R
between –55°C and +85°C and 1,15 times U
C
at +125°C.
Tests are performed with charging periods of 30 seconds, through a 1000 Ω
resistor, and discharging periods of 5 min 30s. 1000 cycles are done.
REVERSE VOLTAGE
Capacitors in silver cases (CT4, CT4E, CT9, CT9E) and some in tantalum cases
(WT83, WS83) cannot withstand any reverse voltage: it would cause damage,
more or less rapidly depending upon the voltage value.
It is therefore necessary to be sure that the bias voltage is high enough to
avoid that the AC voltage creates a reverse voltage (negative peak).
Other capacitors in tantalum cases (CT79, CT79E, ST79, DSCC 93026,
M39006/22 and M39006/25) can withstand a reverse voltage as specified in
the individual datasheet.
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WET TANTALUM CAPACITORS
HERMETICALLY SEALED - TANTALUM CASES
Electrical characteristics
DISSIPATION FACTOR
Dissipation factor is generally measured at the same time as the capacitance,
with the same conditions. It is a function of the series resistance of the
capacitor and the capacitance at low frequency.
DF = ESR x C x 2
p
f
At low frequency, the series resistance is the sum of an ohmic part (leads,
contacts, MnO
2
) and the dielectric losses.
Dissipation factor is given in % and maximum limits are given for each type in
the data sheets.
10
4
ESR CHANGE VS TEMPERATURE
∆ RSE
40
1
0, 4
EQUIVALENT SERIES RESISTANCE OR IMPEDANCE
Equivalent circuit of a capacitor
R
0, 1
–50
–30 –10 0
20
40
60
80
100 120
T (°C)
R
C
L
Z
1/C
ω
Lω
ESR CHANGE VS FREQUENCY
RSE
0, 9
R:
equivalent series resistance of the capacitor (leads,contacts,
MnO
2
, dielectric losses)
L:
inductance mainly due to the leads
C:
capacitance
Impedance
It is specified at 100Hz and –55°C and the formula for impedance is:
Z =k R
2
+ ( L
0, 8
0, 7
0, 6
0, 5
0, 4
0, 3
0, 2
0, 1
100
1k
10k
100 k
f (Hz)
q
- 1/C
q
)
2
It can be seen that:
• at low frequencies, impedance is a function of capacitance
• at high frequencies, impedance is a function of inductance
• at medium frequencies, it is a function of the ESR
Maximum impedance: see data sheets.
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