SRR1240-4R7M Inductors, Coils, Chokes

DC Resistance (DCR):	18 mOhm Max
Height - Seated (Max):	0.177" (4.50mm)
Size / Dimension:	0.492" L x 0.492" W (12.50mm x 12.50mm)
Supplier Device Package:	--
Package / Case:	Nonstandard
Mounting Type:	Surface Mount
Inductance Frequency - Test:	100kHz
Operating Temperature:	-40°C ~ 125°C
Ratings:	--
Frequency - Self Resonant:	33MHz
Q @ Freq:	16 @ 7.96MHz
Series:	SRR1240
Shielding:	Shielded
Current - Saturation:	5.6A
Current Rating:	6A
Tolerance:	±20%
Inductance:	4.7µH
Material - Core:	Ferrite
Type:	Wirewound
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionFixed inductors are passive components used in electrical and electronic systems to induct electrical current. Inductors are electrical components consisting of a coil of conductive wire, and are used to help regulate current levels in electronic circuits by introducing electromagnetic inductance. In this article, we will take a look at the fixed inductor SRR1240-4R7M, its application field and working principle.Application FieldThe SRR1240-4R7M is a fixed inductor from the SRR series produced by Sumitomo Electric Industries, Ltd. It is a high power, low profile, high current chip inductor with a rated DC current up to 370 Amps. Due to this, the SRR1240-4R7M can be used in power supplies, inverters, ballast circuits, automotive applications, and more.Working PrincipleThe SRR1240-4R7M works on the principle of electromagnetic induction. When an electric current passes through the coil of the inductor, it creates a magnetic field. This magnetic field induces a voltage in the coil, which then opposes the original current. This phenomenon is called Back EMF. The magnitude of this voltage is proportional to the rate of change of the current flowing through the coil of the inductor. In other words, the greater the rate of change, the greater the voltage induced by the inductor. ConstructionThe construction of a fixed inductor, such as the SRR1240-4R7M, is quite simple. It consists of a coil of conductive material, in the case of the SRR1240-4R7M, it is a coil of Nickel-iron alloy, wound around a core material, typically ferrite, and encased in a plastic housing. The number of turns of the coil and the diameter of the core are also important factors to consider when determining the inductance of the inductor. InductanceInductance is a measure of the ability of the inductor to induce a voltage in response to a changing current. The higher the inductance of the inductor, the greater the voltage which can be induced. The inductance of an inductor is determined by the number of turns of the coil, the diameter of the core, and the type of material used for the coil and the core. ConclusionThe SRR1240-4R7M is an example of a fixed inductor used in electrical and electronic systems. It is capable of handling up to 370 amps and is a high power, low profile, high current chip inductor. Its application field includes power supplies, inverters, ballast circuits, and automotive applications. It works on the principle of electromagnetic induction, where an increasing or decreasing current causes an induced voltage to oppose the current. The SRR1240-4R7M is constructed of a coil of Nickel-iron alloy and a ferrite core and its inductance is determined by the number of turns, diameter of the core, and the materials used for the core and coil.

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