DR125-4R7-R

DC Resistance (DCR):	10.5 mOhm
Height - Seated (Max):	0.236" (6.00mm)
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:	--
Q @ Freq:	--
Series:	DR
Shielding:	Shielded
Current - Saturation:	9.71A
Current Rating:	7.18A
Tolerance:	±20%
Inductance:	4.7µH
Material - Core:	Ferrite
Type:	Wirewound
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction to DR125-4R7-R

The DR125-4R7-R fixed inductor is a cylindrical magnetic component with an inductance value of 4.7uH±20%. It’s packaged in an 0805 package and has a maximum DC current of 1.2A with a maximum self-resonant frequency of 500Mhz. It also has an encryption marking of the manufacturer’s logo. The DR125-4R7-R is manufactured by multiple companies specializing in components.

Application Field

The DR125-4R7-R is most commonly used in switched-mode power supply (SMPS) applications. It also works well in automotive applications such as power steering assist, car audio systems, anti-lock brakes, and other motor control applications. The DR125-4R7-R can also be used in power amplifier circuits, DC-DC converters, high-frequency DC-AC inverters, and high-frequency switching circuits.

Working Principle

The working principle of the DR125-4R7-R is based on the electromagnetic induction law. This law states that an electromagnetic field is generated when a current passes through a wire coil. This coil, called an inductor, will create a magnetic field that will produce a voltage across its terminals. This voltage is proportional to the rate of change of the current through its terminals. Thus, when an inductor is placed in a circuit, the voltage across its terminals will increase and decrease in proportion to the current flowing through the circuit.

The DR125-4R7-R is designed to have a low DC resistance while maintaining a high inductance. Low DC resistance helps to reduce energy losses due to heat. High inductance provides more inductance per unit length of wire, reducing the size of the inductor. The DR125-4R7-R uses an axle fork method to construct the inductor where the winding is insulated, and the leads are sewn together.

The DR125-4R7-R is also designed with a ferrite core. The ferrite core is a magnetic material which helps the DR125-4R7-R to redirect the magnetic field of the coil, thus increasing the efficiency of the inductor. The ferrite core also helps to reduce the radiated noise from the inductor, resulting in a lower noise component.

Conclusion

The DR125-4R7-R is a fixed inductor designed for use in SMPS, motor control, power amplifier, DC-DC converter, high-frequency DC-AC inverter, and high-frequency switching circuit applications. The DR125-4R7-R has a low DC resistance and high inductance due to its axle-fork construction and ferrite core. This makes it an ideal inductor for a variety of applications.

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