Document Number: 42099 For technical questions, contact: tantalum@vishay.com www.vishay.com
Revision: 17-Feb-10 1
Wet Tantalum Capacitor, Button, All-Tantalum Case,
Non-Polar, - 55 °C to + 125 °C Operation
Series ANP2
Vishay
INTRODUCTION
This conveniently-packaged non-polar button unit employs
a non-solid electrolyte, and has a sintered tantalum anode.
The anode is produced from medium capacitance powder
and the lower CV product allows a tighter specification of
capacitance stability, dissipation factor and leakage current.
The cathode is also of tantalum, and overcomes the
restrictions of a silver cathode system in allowing a high
ripple current rating.
The ANP2 capacitor is based upon the CH capacitor design,
but with twin tantalum electrodes made of sintered
compacts of high purity tantalum powder. The dielectric
layer of tantalum pentoxide is formed on each compact to
withstand rated voltage. This enables the capacitor to be
used where DC bias may fluctuate positively or negatively.
The system is then enclosed between a tantalum plate and
a tantalum cup, with an outer nickel case.
The seal is a highly efficient system comprising a PTFE
gasket clamped between coined plates of tantalum by a
work-hardened nickel ring. This type of seal, common to all
button styles, is largely responsible for their long life and
high reliability under severe military environments.
The combination of the tantalum pentoxide dielectric
stability and the extremely efficient seal has been shown to
ensure that there is no significant difference in electrical
parameters or instant use behaviour after 10 years storage
or longer. A shelf life in excess of 20 years is confidently
expected.
There are four types of terminations and mounting options
are available. These include a treated stud or bolt, PCB pins,
a tab for panels, and ribbons leads slotted through-holes.
These are illustrated in the photograph, and dimensional
table drawing.
APPLICATIONS
The ANP series is designed for use in general military and
professional applications. For example: Power supply
“smoothing”, filter networks, switching, by-pass, timer
functions, and where reverse potential occur.
WEIGHT
The ANP2 style with a stud termination weighs approximately
18.1 g, including the nut. The ANP2 styles, which has a
printed circuit board mounting, weighs approximately 17.3 g.
FEATURES
• All-Tantalum electrodes eliminate silver migration
• Withstands high ripple current
• Long life reliability
• Non-polar design
• Mounting: Through-hole
PERFORMANCE CHARACTERISTICS
Operating Temperature: - 55 °C to + 125 °C
Voltage Range: 3 VDC to 75 VDC
Capacitance Range: 33 μF to 470 μF
SPECIFICATIONS
Environmental classification: 55/125/56
Vibration: 10 Hz to 2000 Hz, 0.75 mm or 98 m/s2, 150 h
Bump: 390 m/s2, 4000 bumps
Shock: 981 m/s2
Acceleration: 981 m/s2
Low air pressure: 1 kPa
REVERSE VOLTAGE CAPABILITY
The ANP2 employs twin tantalum electrodes, which allows
the continuous application of full rated voltage in both
directions.
SURGE VOLTAGE
The surge voltage capability is 115 % of the voltage rating
at the relevant temperature.
TEMPERATURE RANGE
The capacitor is designed for operation between - 55 °C and
+ 125 °C, with linear voltage derating above + 85 °C to 66 %
of the rated voltage at + 125 °C.
CAPACITANCE TOLERANCE
The standard capacitance tolerance is ± 20 % although
special tolerances are available by arrangement.