Conductive Polymer Tantalum Solid Capacitors
Guidelines and precautions (POSCAP)
1. Circuit design
1.1 Prohibited circuits
Since problems can be expected, POSCAP cannot be used on the following circuits
(1) High impedance voltage retention circuits
(2) Time constant circuits
(3) Circuits greatly affected by leakage current
(4) The circuit in which two or more POSCAP are connected in a series so as to raise the endurance voltage.
1.2 Failure and life-span
✽
The failure rate is 0.5 % / 1000 h (Confidence level : 60 %) based on JIS C 5003.
The mainly failure modes are as follows.
✽ B2 size or less : 1.0 %
1.2-1 Contingency failure
The main causes of failure are thermal stresses cause by the soldering or thermal use environment, along with
heat stresses, electrical stresses or mechanical stresses. The most common failure mode is a short circuit.
In case a short circuit occurs, ensure safety by fully considering the followings.
(1) If POSCAP emit smoke, turn off the main power of the equipment. In this case, keep your face and
hands away from the area.
(2) It may take a few seconds to a few minutes before POSCAP emits smoke by the situation. Increase
safety by using a protective circuit.
(3) If the smoke comes into eyes, rinse immediately. If the smoke is inhaled, gargle immediately.
(4) In case a large current continues to flow after a short circuit, in the worst case, the shorted-out
section may ignite. For safety, install a redundant circuit or a protective circuit, etc.
1.2-2 Wear-out failure (lifetime)
When lifetime exceeded the specified guarantee time of Endurance and Damp heat, electrolyte
might insulate and cause electric characteristic changed. This is called an open circuit. The electric
characteristics of capacitance and ESR may possibly change within the specified range in specifications
when it is used under the condition of the rated voltage, electric and mechanical performance. Please
note it when design.
1.3 Reduction of failure stress
When POSCAP is used within the rated voltage, it shows a stable characteristic, but it may be damaged
in a short circuit when an overvoltage, for instance, is applied. The time to reach the failure mode can be
extended by using POSCAP with reduced environment temperature, ripple current and applied voltage.
Failure rate
In the case of the endurance which is 105 °C 2000 h.
0.5 %/1000 h (Environment temp. : 105 °C, Rated voltage or Category voltage applied)
In the case of the endurance which is 105 °C 1000 h or 125 °C 1000 h.
1.0 %/1000 h (Environment temp. : 105 °C, Rated voltage or Category voltage applied)
In the case of the endurance which is 85 °C 1000 h.
1.0 %/1000 h (Environment temp. : 85 °C, Rated voltage applied)
1.4 Check the rated performance
After checking the operation and installation environments, design the circuit so that it falls within the rated
performance range stipulated in this delivery specification.
1.5 Operating temperature and ripple current
(a) Set the operating temperature so that it falls within the range stipulated in this delivery specification.
(b) Do not apply current that exceeds the allowable ripple current. Ripple current should be controlled so that
surface temperature of a capacitor do not exceed the rated temperature.
(For questions regarding TQC series, please contact us.)
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
01 Nov. 2015
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