Series CH2
www.vishay.com
Vishay
Wet Tantalum Capacitor, Button,
All-Tantalum Case, - 55 °C to + 150 °C Operation
FEATURES
• All-Tantalum electrodes eliminate silver migration
• Withstands high ripple current
• Long life reliability
• Reverse voltage capability
• Mounting: Through-hole
PERFORMANCE CHARACTERISTICS
Operating Temperature: - 55 °C to + 150 °C
INTRODUCTION
This conveniently-packaged polar button unit employs a
non-solid electrolyte, and has a sintered tantalum anode.
The anode is produced from a 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 and application of a 3 V reverse
potential.
Both anode and cathode consists of sintered compacts of
high purity tantalum powder. The dielectric layer of tantalum
pentoxid electrolytically formed on each compact is
completely stable. The system is 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 CH2 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.
Voltage Range: 3 VDC to 75 VDC
Capacitance Range: 33 μF to 470 μF
SPECIFICATIONS
Environmental classification: 55/150/56
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 CH2 series employ tantalum cathodes which allow
the continuous application of reverse potentials not
exceeding 3 V over the whole temperature range.
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
+ 150 °C, with linear voltage derating above + 85 °C to 66 %
of the rated voltage at + 150 °C.
CAPACITANCE TOLERANCE
The standard capacitance tolerance is ± 20 % although
special tolerances are available by arrangement.
RIPPLE CURRENT CAPABILITY
The maximum allowable ripple current is 750 mARMS. This
value applies under normal cooling conditions and is
irrespective of frequency or waveform. The algebraic sum of
the AC peak and DC voltages must not exceed the forward
or reverse voltage ratings at the relevant temperature.
WEIGHT
The CH2 style with a stud termination weighs approximately
18.1 g, including the nut. The CH2 styles, which has a printed
circuit board mounting, weighs approximately 17.3 g.
Revision: 04-Nov-11
Document Number: 42098
1
For technical questions, contact: tantalum@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
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