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What Is The Symbol OF A Capacitor? - Capacitor Knowledge

What Is The Symbol OF A Capacitor? - Capacitor Knowledge

November 23 , 2023 0

A Brief Introduction To Capacitors

What Is Capacitor

Capacitor is the most commonly used device in circuit design, and it is only one of the passive components. Active devices simply means that devices that require energy are called active devices, and devices that do not require energy are passive devices. Capacitors also often play an important role in high-speed circuits. The role and use of capacitors are generally many kinds, such as: the role of bypass, decoupling, filtering, energy storage, the role of oscillation synchronization and the role of time constant.

Capacitor Symbol

Common capacitor symbols are shown in the figure below

Capacitance Unit

The basic unit of capacitance is: F(method), in addition to μF (micromethod), nF(nano method), pF (skin method), the capacity of capacitance F is very large, we see is generally the unit of μF, nF, pF, 1F = 1000000μF; 1μF=1000nF=1000000pF; 1nF=1000pF

Capacitance Wthstand Voltage Value

Each capacitor has its voltage withstand value, the nominal voltage of ordinary non-polar capacitors are: 63V, 100V, 160V, 250V, 400V, 600V, 1000V and so on. The voltage withstand value of polar capacitor is relatively lower than that of non-polar capacitor, and the general nominal voltage withstand value is: 4V, 6.3V, 10V, 16V, 25V, 35V, 50V, 63V, 80V, 100V, 220V, 400V and so on

Encapsulation OF Capacitor

In this section, we will give examples of some of the more common types of capacitor packages

In-Line Non-Polar Capacitor:

The non-polar capacitor package is identified by RAD, with RAD-0.1 RAD-0.2 RAD-0.3 and so on. The number at the back represents the center hole spacing of the pad, unit inch 1in=1000mil 0.in =100mil=0.254mm Common chip capacitor (104) its package is RAD-0.1, which is expressed as a non-polar capacitor, and the two-pin spacing is 0.254(100mil).

In-line Polar Capacitor

The polar capacitor package is marked by RB, RD.2/.4 Rb.3 /.6 RB.4/.8, etc. The first number represents the center hole spacing of the pad, and the second number represents the capacitance diameter. The unit inch is as follows: RB.2/.4, its pin spacing is 200mil, the diameter is 400mil, sometimes in the description description package will directly say the diameter and height of the capacitor, C12*16, indicating that the capacitor diameter is 10mm, the height is 16mm.

The Patch Is Non-polar Capacitor

Non-polar patch capacitor package size standards are as follows

The actual size of the chip capacitor package

The commonly used package is 0805 and 0603, but the capacity of this non-polar chip capacitor is not very large due to the volume limitation.
Large-capacity chip capacitors generally choose chip silver electrolytic capacitors or chip aluminum electrolytic capacitors

Electrolytic Capacitance

Major electrolytic capacitors: there are 4 commonly used, A, B, C, D type, the package size is 3216 3528 6032 7343
In millimeters, the same numbers denote length and width respectively
Its advantages are small size, small capacity error, stable performance and wide temperature range
However, there are also some disadvantages: small voltage resistance, small current, high price X The following figure is the corresponding table of the package and capacity of the major electrolytic capacitor

Additional models and packaging presentations

Chip Aluminum Electrolytic Capacitor

The chip aluminum electrolytic capacitor package size is as follows:

The following diagram shows common size and capacity relationships

The following picture shows the 3D model and PCB