103-121F

DC Resistance (DCR):	125 mOhm Max
Height - Seated (Max):	0.075" (1.91mm)
Size / Dimension:	0.100" L x 0.100" W (2.54mm x 2.54mm)
Supplier Device Package:	--
Package / Case:	Nonstandard, 2 Lead
Mounting Type:	Surface Mount
Inductance Frequency - Test:	25MHz
Operating Temperature:	-55°C ~ 125°C
Ratings:	--
Frequency - Self Resonant:	750MHz
Q @ Freq:	30 @ 25MHz
Series:	103
Shielding:	Unshielded
Current - Saturation:	--
Current Rating:	880mA
Tolerance:	±1%
Inductance:	120nH
Material - Core:	Ferrite
Type:	--
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

Fixed inductors, or "passive components," are one of the most essential components in electrical circuits. They are designed to control the current flow in a circuit or to store electromagnetic energy. Fixed inductors are also referred to as "fixed-value inductors," since the inductance, which is a measure of its ability to store or oppose the flow of electrical current, varies with the physical size of the component and is typicall fixed. This article will discuss the 103-121F application field as well as how it works.

The 103-121F Application Field

The 103-121F (or common mode inductors), is a type of fixed inductor specifically designed for low frequency signal transmission in telecommunication systems, including CATV, radio, and audio applications. It is used for audio frequency signal transmission, like those found in radio and television applications, and supports transmitted/received signals over different applications. The 103-121F is notably known for its ability to reduce common-mode noise and unwanted signals effectively, as its inductance value is optimized for the most noise-resistant transmission. The 103-121F also helps to control radio frequency disturbances, including frequency interferences in the range of 0.5MHz~2MHz and downward interference in the range of 0.05MHz~0.5MHz.

The 103-121F Working Principle

The working principle of the 103-121F is fairly straightforward. It works by transforming high-frequency signals into low-frequency signals, reducing radio frequency disturbances, allowing interference signals to pass through its core, and suppressing common-mode noise.The core of the 103-121F is made of an alloy containing high-DC resistance and low-DC loss material that interrupts the current flow, generating magnetic field in the component. This magnetic field acts as a buffer, allowing only the desired signal to pass through the inductor.The 103-121F has an optimal coil design that improves high-frequency impedance and input voltage stability. The size and shape of the 103-121F inductors also play an important role in how well they work. To maximize its effectiveness, the inductors must be adequate in size with proper spacing to ensure the desired attenuation level is achieved.

Conclusion

The 103-121F is a fixed inductor designed for low-frequency signal transmission, specifically for CATV, radio, and audio applications. It is most known for its ability to effectively reduce common-mode noise and unwanted signals. Its working principle is based on the principle of electromagnetic induction. The core of the inductor consists of an alloy with high-DC resistance and low-DC loss material, and the size and shape of the inductor effect how well it works.

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