ALP22A682AB010 Datasheet, PDF (9/10 Pages) Kemet Corporation – Pin/Solder Tag/Audio Aluminum Electrolytic Capacitors

Pin/Solder Tag/Audio Aluminum Electrolytic Capacitors – ALP22 and ALT22/23 Series, +85°C
Construction Data
The manufacturing process begins with the anode foil being
electrochemically etched to increase the surface area and
then “formed” to produce the aluminum oxide layer. Both the
anode and cathode foils are then interleaved with absorbent
paper and wound into a cylinder. During the winding process,
aluminum tabs are attached to each foil to provide the
electrical contact.
Extended cathode
Anode foil
The deck, complete with terminals, is attached to the tabs and
then folded down to rest on top of the winding. The complete
winding is impregnated with electrolyte before being housed
in a suitable container, usually an aluminum can, and sealed.
Throughout the process, all materials inside the housing must
be maintained at the highest purity and be compatible with the
electrolyte.
Each capacitor is aged and tested before being sleeved and
packed. The purpose of aging is to repair any damage in the
oxide layer and thus reduce the leakage current to a very low
level. Aging is normally carried out at the rated temperature
of the capacitor and is accomplished by applying voltage to
the device while carefully controlling the supply current. The
process may take several hours to complete.
Damage to the oxide layer can occur due to variety of reasons:
• Slitting of the anode foil after forming
• Attaching the tabs to the anode foil
• Minor mechanical damage caused during winding
A sample from each batch is taken by the quality department
after completion of the production process.
The following tests are applied and may be varied at the
request of the customer. In this case the batch, or special
procedure, will determine the course of action.
Cathode foil
Tissues
Etching
Forming
Winding
Decking
Impregnation
Assembly
Aging
Testing
Electrical:
• Leakage current
• Capacitance
• ESR
• Impedance
• Tan Delta
Mechanical/Visual:
• Overall dimensions
• Torque test of mounting stud
• Print detail
• Box labels
• Packaging, including
packed quantity
Sleeving
Packing
Foil tabs
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com
A4046_ALP_T22_23 • 8/11/2016 9