Download IPC T-50 Terms and Definitions

IPC T-50 Terms and Definitions
Of Interest to Embedded Passives Subcommittees
Capacitance
Capacitive Coupling
Capacitance Density
Characteristic Impedance
Dielectric
Dielectric Breakdown
Dielectric Constant
Dielectric Strength
Dissipation Factor
Effective Permittivity
Effective Relative Dielectric Constant
Electrical Resistance
Electrostatic Discharge (ESD)
Embedded Component
Equivalent Series Resistance (ESR)
Farad
Ground Plane
Hipot Test
Impedance
A measure of the ability of two adjacent conductors separated
by an insulator to hold a charge when a voltage is impressed
between them.
The electrical interaction between two conductors that is
caused by the capacitance between them.
The amount of capacitance available per unit area.
The resistance of a parallel conductor structure to the flow of
alternating current (AC), usually applied to high speed circuits,
and normally consisting of a constant value over a wide range
of frequencies.
A material with a high resistance to the flow of direct current,
and which is capable of being polarized by an electrical field.
The complete failure of a dielectric material that is
characterized by a disruptive electrical discharge through the
material that is due to deterioration of material or due to an
excessive sudden increase in applied voltage.
The ratio of the capacitance of a configuration of electrodes
with a specific material as the dielectric between them to the
capacitance of the same electrode configuration with a
vacuum or air as the dielectric.
The maximum voltage that a dielectric can withstand under
specified conditions without resulting in a voltage breakdown,
usually expressed as volts per unit dimension.
A parameter used to express the tendency of insulators or
dielectrics to absorb some of the energy in an alternating
current signal. The parameter is expressed as the ratio of loss
current to charging current, and is given by e"/e', where e' and
e" are the real and imaginary parts of the permittivity.
See "Dielectric Constant."
The value of the dielectric constant obtained when
experimentally determined in an application as opposed to
measured values of sample material.
(See Resistance)
The instantaneous transfer of charges accumulated on a
nonconductor to a grounded conductor.
A discrete component that is fabricated as an integral part of a
printed board.
A loss parameter used to compare two capacitors of equal
value in order to determine their relative effectiveness as
filters.
A unit of electrical capacitance.
A conductor layer, or portion thereof, that serves as a common
reference for electrical circuit returns, shielding, or heat
sinking. (See also "Signal Plane" and "Voltage Plane.")
A method in which the unit under test is subjected to a high
alternating current (ac) voltage.
The resistance to the flow of current, represented by an
electrical network of combined resistance, capacitance and
inductance reaction, in a conductor as seen by an AC source
of varying time voltage.The unit of measure is ohms.
Inductance
Laminate (n.)
Load Capacitance
Passive Base Material
Passive Component (Element)
Permeability
Permittivity
Permittivity
Printed Component
Printed Components, Conductive Inks
Power Plane Inductance
Relative Permittivity (єr)
Resistance
Resistive Clad Laminate
Sheet Capacitance
Sheet Resistance
Static Relative Permittivity
Voltage Plane
Compiled by Sidney Cox December 2002.
The property of a conductor that allows it to store energy in a
magnetic field induced by a current flowing through it.The unit
to measure is henry.
A product made by bonding together two or more layers of
material.
The capacitance seen by the output of a logic circuit or other
signal source.
Base material, that does not exhibit transistance, that serves
as the physical support and thermal sink for film circuits.
A discrete electronic device whose basic character does not
change while it processes an applied signal.(This includes
components such as resistors, capacitors, and inductors.)
A general term used to express various relationships between
magnetic induction and magnetizing force.
See "Dielectric Constant."
The square foot of the ratio of the electromagnetic wave
propagation characteristics of free space to that of the
dielectric medium. The permittivity, є, of a material is, in
general, a complex-valued (has real and imaginary parts)
parameter.
A part (such as an inductor, resistor, capacitor, or
transmission line) that is formed as part of the conductive
pattern of a printed board.
Component (e.g.printed inductor, resistor, capacitor or
transmission line) forming part of the pattern of a printed
circuit.
The reactive component inductance, in response to AC noise,
seen on a DC backplane system.
The relative permittivity, єr, is the ratio of the permittivity of a
material to that of free space.
The restriction to the flow of electrons, determined by Ohms
law; the quotient of DC voltage, applied to the extremes of a
conductor or insulator, and the current flowing through it.
A clad laminate containing resistive material that is used in
making planar resistors.
The electrical capacitance of a material as measured from one
electrode to another, expressed in a unit of capacitance
(e.g.farads or microfarads) per unit area.
The electrical resistance of a planar film of a resistive material
with uniform thickness as measured across opposite sides of
a unit square pattern, expressed in ohms per square.
The ratio of the capacitance (Cx) of a given configuration of
electrodes with a specified dielectric, filling all the region pf
electropotential field, to the capacitance (Cv) of the same
electrode configuration with a vacuum (or air) as the dielectric.
A conductor layer, or portion thereof, that serves as a common
voltage source at other than ground potential for an electrical
circuit, shielding, or heat sinking.(See also "Ground Plane"
and "Signal Plane.")