Datasheet

12© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 [phone] • www.kemet.com A4020_ALC10 • 8/27/2015
Snap-In Aluminum Electrolytic Capacitors – ALC10 Series, +85ºC
Mechanical Data
Polarity and Reversed Voltage
Aluminium Electrolytic capacitors manufactured for use in DC applications contain an anode foil and a cathode foil. As such, they are
polarized devices and must be connected with the +ve to the anode foil and the -ve to the cathode foil. If this were to be reversed then
the electrolytic process that took place in forming the oxide layer on the anode would be recreated in trying to form an oxide layer on
the cathode. In forming the cathode foil in this way, heat would be generated and gas given off within the capacitor, usually leading to
catastrophic failure.
The cathode foil already possesses a thin stabilized oxide layer. This thin oxide layer is equivalent to a forming voltage of approximately
2 V. As a result, the capacitor can withstand a voltage reversal of up to 2 V for short periods. Above this voltage, the formation process
will commence. Aluminium Electrolytic capacitors can also be manufactured for use in intermittent AC applications by using two anode
foils in place of one anode and one cathode.
Mounting Position
The capacitor can be mounted upright or inclined to a horizontal position.
Insulating Resistance
≥ 100 MΩ at 100 VDC across insulating sleeve. UL recognized sleeving is available for custom parts in this range, upon request.
(UL No. E358957)
Voltage Proof
≥ 2,500 VDC across insulating sleeve.
Safety Vent
A safety vent for overpressure is featured on either the base (opposing end to the terminals) or the side of the can. This appears in the
form of a grooved section on the surface of the can, which is a weakened area and designed to relieve build-up of internal pressure due
to overstress or catastrophic failure.