Datasheet
10© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard A4081_ALC70 • 4/29/2019
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Snap-In Aluminum Electrolytic Capacitors – ALC70, +85°C
Environmental Compliance
As an environmentally conscious company, KEMET is working continuously with improvements concerning the environmental
effects of both our capacitors and their production.
In Europe (RoHS Directive) and in some other geographical areas like China, legislation has been put in place to prevent the
use of some hazardous materials, such as lead (Pb), in electronic equipment. All products in this catalog are produced to
help our customers' obligations to guarantee their products and fulll these legislative requirements. The only material of
concern in our products has been lead (Pb), which has been removed from all designs to fulll the requirement of containing
less than 0.1% of lead in any homogeneous material. KEMET will closely follow any changes in legislation world wide and
makes any necessary changes in its products, whenever needed.
Some customer segments such as medical, military, and automotive electronics may still require the use of lead in electrode
coatings. To clarify the situation and distinguish products from each other, a special symbol is used on the packaging labels
for RoHS compatible capacitors.
Due to customer requirements, there may appear additional markings such as lead-free (LF) or lead-free wires (LFW) on the
label.
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. Special attention for the safety vent coverage,
which this ensures that internal gas generated can escape when the pressure reaches a certain value due to overstress or
catastrophic failure. All mounting positions must allow the safety vent to work properly.
Insulating Resistance
≥ 100 MΩ at 100 VDC across insulating sleeve.
Voltage Proof
≥ 3,500 VDC across insulating sleeve.
≥ 2,500 VAC across insulating sleeve.
Safety Vent
For diameters up to 40 mm, the safety vent for overpressure is featured on the base (opposing end to the terminals), and for
diameters 45 mm or higher, the safety vent is featured in the side of the can. This is a weakened area in the bottom of the
can that is designed to relieve build-up of internal pressure due to overstress or catastrophic failure.