299D
www.vishay.com
Vishay Sprague
Revision: 11-Mar-13
5
Document Number: 40044
For technical questions, contact: tantalum@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
PERFORMANCE CHARACTERISTICS
(Continued)
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 + 125 °C, the leakage current shall not exceed
15 times the value listed in the Standard Ratings
table.
8. Life Test: Capacitors shall withstand rated DC
voltage applied at + 85 °C for 1000 h, with a circuit
resistance no greater than 3 .
8.1 Following the life test, the dissipation factor shall
meet the initial requirement; the capacitance change
shall not exceed - 10 % to + 10 %; the leakage
current shall not exceed 125 % of the initial
requirement.
9. Lead Strength:
9.1 Capacitors shall withstand a force of 2 pounds (9N)
applied axially to the leads for 10 seconds, without
failure.
9.2 Capacitor leads shall withstand 2 bends through 90°
at the point of egress from the case, without failure.
9.3 No stress shall be applied to the capacitor case
during the preceding tests.
10. Flammability: Encapsulant materials meet UL 94-VO
with an oxygen index of 32 %.
11. Capacitor Failure Mode: The predominant failure
mode for solid tantalum capacitors is increased
leakage current resulting in a shorted circuit.
Capacitor 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
Ta2O5 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.”
12. Humidity Test: Capacitors shall withstand 1000 h at
+ 55 °C, 90 % to 95 % relative humidity, with no
voltage applied.
12.1 Following the humidity test, capacitance change
shall not exceed - 10 % to + 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.
GUIDE TO APPLICATION
1. AC Ripple Current: The maximum allowable ripple
current shall be determined from the formula:
where,
P = Power Dissipation in W at + 25 °C as given in
the table in paragraph number 6
(Power Dissipation)
R
ESR
= The capacitor Equivalent Series Resistance
at the specified frequency
2. AC Ripple Voltage: The maximum allowable ripple
voltage shall be determined from the formula:
or, from the formula:
where,
P = Power Dissipation in W at + 25 °C as given
in the table in paragraph number 6 (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.
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.
2.3. 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:
3. 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.
TEMPERATURE DERATING FACTOR
+ 25 °C 1.0
+ 55 °C 0.8
+ 85 °C 0.6
+ 125 °C 0.4
I
RMS
P
R
ESR
------------=
V
RMS
Z
P
R
ESR
------------=
