Electronic Components & Devices

Glossary of electronic components



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A

AC voltage characteristics

Change of capacitance against the AC voltage.

Aging

The decrease of capacitance over time.


B

Bypass, Decoupling

To filter out high frequency noise and to decouple one part of an electrical circuit from another.



C

Capacitance

Index of the ability of how much potential energy can be stored. Unit is "F".

Capacitor

1. Stores DC power, enabling charge and discharge.
2. An electronic component which passes the AC (signal and/or high-frequency noise) through and prevents DC.
Capacitor

Coupling

To eliminate the DC voltage and only pass AC signals through.


D

DC bias characteristic

Change of capacitance against the DC voltage.

Dielectric constant

The measurement of the ability of a dielectric to store potential energy in external electric fields.

Dielectric tangent

Index of energy loss caused due to the resistivity of dielectric and electrode material.

Dielectrics

Substance that can be polarized in external electric fields and stores DC power.


E

EMC

Abbreviation of Electromagnetic Compatibility. The concept of enabling electronic devices to function without EMI.

EMI

Abbreviation of Electromagnetic Interference. A disturbance of an electrical circuit caused by external interference of an electromagnetic origin.

EMS

Abbreviation of Electromagnetic Susceptibility. The vulnerability of an electric circuit to a disturbance of electromagnetic origin.

ESL

Abbreviation of Equivalent Series Inductance. One of the resistive components in an AC circuit. ESL describes the inductive portion of the impedance of electronic components.

ESR

Abbreviation of Equivalent Series Resistance. One of the resistant components in an AC circuit. ESR depends on dielectric loss caused by the dielectric material and resistivity of the electrode material.

E Series

Rated capacitance of capacitors is defined by E series according to the JIS - Japanese Industrial Standards. "E STANDARD NUMBERS" in our catalogue
E3 series: Multiple of cardinal numbers 10, 22 and 47
E6 series: Multiple of cardinal numbers 10, 15, 22, 33, 47, and 68
E12 series: Multiple of cardinal numbers 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68 and 82


F

Flow soldering

There are immersing method and jet flowing method. After inserting leads of components into PCB holes or pre-fixing components on PCB, soldered by immersed in a molten solder bath or by jet solder.


H

High Dielectric Constant type (Class II)

Mainly X5R, X7R, X7S type capacitors, and barium titanate dielectric ceramics are its main material. Compared with the temperature-compensating type, variation in capacitance is larger due to temperatures, voltages, and ageing; however, this type can be smaller in size to gain high capacitance values.


I

Insulation resistance

The extent to which a dielectric material resists leakage current measured under DC voltage.


P

Polarization

The charge orientation in dielectrics. Dielectric crystals contain positive and negative sides due to the structure in external electric fields.


R

Rated voltage

(withstand voltage) code

Rated voltages (withstand voltages) are expressed by combination of alphanumeric as follows:

Rated voltage4V6.3V10V16V25V35V50V100V
Code0G0J1A1C1E1V1H2A



Reflow Soldering

A soldering method in which solder is applied to electronic components and then melted in a reflow oven to permanently mount them to a printed circuit board (PCB).


S

SMD

Abbreviation of Surface Mount Device. Components suitable for SMT equipment.

Smoothing

To suppress the ripple and smooth the voltage fluctuation.

SMT

Abbreviation of Surface Mount Technology. A method of producing electronic circuits on a printed circuit board (PCB) by applying solder paste and placing components on the PCB's surface before the solder is melted in a reflow oven.


T

Temperature-Compensating type (Class I)

Mainly CG and CH type capacitors and titanium oxide and zirconate dielectric ceramics are its main materials. With small variation in capacitance due to temperatures, voltages, and ageing, this type is suitable for applications requiring stability; however, rated capacitances are smaller than high dielectric constant type capacitors.

Temperature dependent characteristics

Rated capacitance of capacitors can change according to the ambient temperature. Such variance in rated capacitance is defined as temperature dependent characteristics.

Three-digit code

The unit of capacitance of capacitors is picofarad (pF) and expressed in three-digit alphanumeric. The first and second figures are significant digits and the third figure expresses the number of zeros that follow the two numbers. If there is a decimal point, it is expressed by the capital letter "R." In this case, all figures are significant digits.
e.g.) "475" = 4,700,000pF = 4.7µF, "4R7" = 4.7 pF, "R50" = 0.5 pF

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