4909-S

Series:	4900
Packaging:	Bulk
Part Status:	Obsolete
Inductance:	296nH
Tolerance:	--
Q @ Freq:	55 @ 45MHz
Mounting Type:	Through Hole
Package / Case:	Radial
Size / Dimension:	0.400" L x 0.400" W (10.16mm x 10.16mm)
Height:	0.562" (14.27mm)

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Adjustable Inductors - 4909-S Application Field and Working PrincipleAdjustable inductors are a type of inductance component based on a physical inductor that have the capability to adjust the inductance of the inductor. These adjustable inductive devices are widely used in adjustable power supplies, resonant circuits, filters, oscillator resonators, and multiplexer circuits. The most popular adjustable inductor device is the widely used 4909-S, which is a type of radio frequency and microwave adjustable inductor. This device is capable of providing a variety of inductance values with high precision characteristics. The basic construction of the 4909-S device is similar to most other adjustable inductors, with the exception that the 4909-S has two sets of inductors installed onto one substrate. The silicon substrate of the 4909-S is comprised of two "fingers" that are separated by an inlet line. Each finger contains a spiral-shaped inductor that is wound with copper wire. The copper wires are thin and tightly connected over the entire surface of the device, forming a series inductor. The working principle of the 4909-S adjustable inductor is fairly simple. When voltage is applied to the device, electric current flows through the copper wires and creates a magnetic field. This magnetic field produces an electromotive force (EMF) that causes an electric current to flow in the opposite direction. This "reverse" current provides an external inductance, causing the total inductance of the device to increase. The device also uses a shunting element or "shunt" to reduce the external inductance at low frequencies. The shunting element is a thin oxide layer that covers the copper wires and absorbs the electric current. This reduces the external inductance, allowing the total inductance of the device to decrease. By using this combination of series and shunt elements, the inductance of the adjustable inductor can be manipulated and adjusted over a wide range. The 4909-S is widely used in many electronic applications and is capable of providing high precision inductance control. It can be used in a variety of applications such as adjustable power supplies, resonant circuits, filters, oscillator resonators, and multiplexer circuits. The 4909-S has several unique features that make it an ideal inductive device for adjustable power supply applications. First, it has a small form factor with a large inductance range. This makes it suitable for use in compact designs with high power requirements. Second, it has an excellent low-loss characteristic. This means that the device can create a relatively large inductance value with minimal power losses. And third, it is capable of providing precise and stable inductance values over a wide range of inductance. The device can provide high accuracy and repeatability in applications with high power requirements. In conclusion, the 4909-S adjustable inductor is a versatile and powerful device that is capable of providing precise and stable inductance values over a wide range. Its small form factor, wide inductance range, and low-loss characteristics make it ideal for a variety of applications including adjustable power supplies, resonant circuits, filters, oscillator resonators, and multiplexer circuits.

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