One of the most popular of the thru-hole style capacitors are the dipped tantalum capacitors. Resin dipped tantalum capacitors are often used in commercial and industrial applications. Some of the advantages of using tantalum as a dielectric are: They have a higher volumetric efficiency when compared to other types of capacitors.
They take up very little space on a printed circuit board. Tantalum capacitors have superior frequency characteristics over other types of capacitors. They are very reliable, with a shelf life that is regarded as unlimited. They do not wear out in production. They can function with a very wide temperature range (-55° to +125°C).
These types of capacitors are very durable. They are coated with a flame retardant resin that allows the capacitor to be effective in most kinds of environments. They feature low leakage current and impedance.
The lead spacing and form outline are very important in selecting your choice of dipped tantalum capacitor. Lead spacing is determined is offered in a few common spreads. They are indicated in the chart below.
There are some common outline forms used by the leading manufacturers of dipped radial tantalum capacitors. Some of these have names such as "hairpin" "hockey-stick" and "lock-in". These are determined by the type of crimps in the leads.
These capacitors are made to specific case sizes. Some manufacturers offer a wider selection than others. For example AVX offers their TAP series of dipped radial tantalum capacitors in 15 case sizes while Sprague/Vishay offers their comparable 199D series in 6 sizes.
Since a dipped radial tantalum capacitor is polarized it is important to understand how these units are marked to ensure that they are inserted properly into the circuit. We have included charts they will show you how some of the leading manufacturers mark this style of capacitor along with the most common lead forms.
Some applications where you can use a dipped tantalum capacitor are bypassing, coupling, blocking, filtering and timing in wide range of commercial, industrial and military applications. Other types of capacitors that can be used for these applications are ceramic and film capacitors. Each dielectric has advantages and disadvantages. The tantalum advantages are higher capacitance values within a given package size and stability of capacitance with applied DC voltage.
|C style||B style||S style|
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Tedss Dipped Tantalums
|Type||Case code||Capacitance code in pF||Tolerance||DC Voltage||Lead Form|
Tedss' Case Code Dimensions:
|A||up to 0.18in (4.5 mm)||up to 0.3in (7.6 mm)|
|B||up to 0.2in (95 mm)||up to 0.41in (10.5 mm)|
|C||up to 0.26in (6.5 mm)||up to 0.45in (11.5 mm)|
|D||up to 0.38in (9.6 mm)||up to 0.63in (16.0 mm)|
|E||over 0.38in (9.6 mm)||over 0.63in (16 mm)|
AVX Dipped Tantalums
|Type||Capacitance code in pF||Tolerance||DC Voltage||Lead form and packaging|
KEMET Dipped Tantalums
|Type||Case code||Capacitance code in pF||Tolerance||DC Voltage||Failure Rate||Lead material|
SPRAGUE Dipped Tantalums
|Type||Capacitance code in pF||Tolerancece||DC Voltage||Case code||Lead style||Packaging code|