79F221K-TR-RC Inductors, Coils, Chokes

DC Resistance (DCR):	20 Ohm Max
Height - Seated (Max):	--
Size / Dimension:	0.100" Dia x 0.160" L (2.54mm x 4.06mm)
Supplier Device Package:	Axial
Package / Case:	Axial
Mounting Type:	Through Hole
Inductance Frequency - Test:	790kHz
Operating Temperature:	-55°C ~ 105°C
Ratings:	--
Frequency - Self Resonant:	5MHz
Q @ Freq:	40 @ 790kHz
Series:	79F
Shielding:	Unshielded
Current - Saturation:	--
Current Rating:	35mA
Tolerance:	±10%
Inductance:	220µH
Material - Core:	Ferrite
Type:	Wirewound
Part Status:	Obsolete
Packaging:	Tape & Box (TB)

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Fixed Inductors

Fixed inductors, sometimes simply referred to as inductors, are components that store energy in a magnetic field when a current flows through them. Basic inductor design contains a coil of wire wrapped around a core, which can be either ferromagnetic or air. The 79F221K-TR-RC is a type of fixed inductor, which is mainly used in DC/DC converters, power supplies, and switching regulators.

Application Field

The 79F221K-TR-RC fixed inductor is ideal for applications where size and performance are critical, such as DC/DC converters, power supplies, and switching regulators. The 79F221K-TR-RC has an operating temperature range of -40°C to +125°C and can withstand up to 1.5A DC current and 3.0A pulsed current.The 79F221K-TR-RC is constructed of two types of wire for improved accuracy, and has an inductance of 0.75µH. It is rated for 100kHz operation, and has excellent EMI/RFI characteristics. The 79F221K-TR-RC is available in several sizes to meet your exact application requirements, including 1210 (6.35 x 5.84 x 1.6mm), 1812 (9.5 x 7.0 x 1.6mm), and 2220 (11.5 x 9.0 x 1.6mm).

Working Principle

The working principle of a fixed inductor is quite simple: when a current flows through it, magnetic flux is generated, which then induces a current in the wire that makes up the inductor\'s coil. This is known as inductive reactance.Inductive reactance can be used to regulate current. For example, in a DC/DC converter circuit, an inductor can be used to reduce the current flow whenever the input voltage is too high, thus keeping the output voltage from rising too much. This can be thought of as a simple limit on current flow: the more current that flows, the higher the inductive reactance, thus the less current that can flow.The 79F221K-TR-RC combines this basic principle with size and performance features to create an optimal package for circuits requiring high current. The two wire types used in its construction, along with its high inductance, low temperature coefficient, and excellent EMI/RFI characteristics, make it ideal for applications such as DC/DC converters, power supplies, and switching regulators that require superior performance.

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