www.vishay.com
71
594D
Vishay Sprague
Document Number 40006
Revision 09-Mar-05
For technical questions, contact tantalum@vishay.com
PERFORMANCE CHARACTERISTICS (Continued)
8 ESR (Equivalent Series Resistance)
Measurement shall be made by the bridge method at a
frequency of 100kHz and a temperature of + 25°C.
8.1 The equivalent Series Resistance shall not exceed the
value listed in the Standard Ratings Table.
9. Life Test: Capacitors shall withstand rated DC voltage
applied at + 85°C or two-thirds rated voltage applied at
+ 125°C for 2000 hours.
9.1 Following the life test, the dissipation factor shall meet
the initial requirement; the capacitance change shall
not exceed ± 10%; the leakage current shall not
exceed 125% of the initial requirement.
10. Humidity Test: Capacitors will withstand 1000 hours
at + 40˚C, 90% to 95% relative humidity, with no
voltage applied.
10.1 Following the humidity test, capacitance change shall
not exceed ± 10% of the initial value, dissipation factor
shall not exceed 150% of the initial requirement;
leakage current shall not exceed 200% of the initial
requirement at + 25˚C.
11. Solderability: Capacitors will meet the solderability
requirements of ANSI/J-STD-002, Test B, Category 3.
12. Resistance to Soldering Heat: Capacitors mounted
on a substrate will withstand + 260°C for 5 seconds.
12.1 Following the resistance to soldering heat test,
capacitance, dissipation factor and DC leakage current
shall meet the initial requirement.
13. Marking: The small body area of these capacitors
does not allow elaborate marking schemes. All
required information is present on the carton or
package in which the parts are shipped; in addition,
part number, quantity and date code are indicated on
the reels.
14. Terminal Strength: Per IEC-384-3, minimum of 5N
shear force.
15. Environmental: Mercury, CFC and ODS materials
are not used in the manufacture of these capacitors.
16. Flammability: Encapsulant materials meet UL94 V0.
17. Capacitor Failure Mode: The predominant failure
mode for solid tantalum capacitors is increased
leakage current resulting in a shorted circuit. Capaci-
tor failure may result from excess forward or reverse
DC voltage, surge current, ripple current, thermal
shock or excessive temperature.
The increase in leakage is caused by a breakdown of
the Ta
2
O
5
dielectric. For additional information on
leakage failure of solid tantalum chip capacitors, refer
to Vishay Sprague Technical Paper, “Leakage Failure
Mode in Solid Tantalum Chip Capacitors.”
2.0 A-C Ripple Current: The maximum allowable
ripple current shall be determined from the formula:
where,
P = Power Dissipation in Watts @ + 25°C as given
in the table in Paragraph Number 6.0 (
Power Dissipation)
R
ESR
= The capacitor Equivalent Series Resistance
at the specified frequency.
3.0 A-C Ripple Voltage: The maximum allowable ripple
voltage shall be determined from the formula:
or, from the formula:
where,
P = Power Dissipation in Watts @ + 25°C as given in
the table in Paragraph Number 6.0 (Power Dissipation).
R
ESR
= The capacitor Equivalent Series Resistance
at the specified frequency.
Z=The capacitor Impedance at the specified
frequency.
3.1 The sum of the peak AC voltage plus the DC voltage
shall not exceed the DC voltage rating of the capacitor.
P
R
ESR
I
rms
=
V
rms
= I
rms
x Z
P
R
ESR
V
rms
= Z
GUIDE TO APPLICATION
1.0 Recommended rated working voltage guidelines:
(-55°C to + 85°C)
Standard Conditions, for example; output filters
Capacitor Voltage Rating (V) Operating Voltage (V)
4 2.5
6.3 3.6
10 6
16 10
20 12
25 15
35 24
50 28
Severe Conditions, for example; input filters
Capacitor Voltage Rating (V) Operating Voltage (V)
4 2.5
6.3 3.3
10 5
16 8
20 10
25 12
35 15
50 24
