PM20-3R9K

DC Resistance (DCR):	1.3 Ohm Max
Height - Seated (Max):	0.087" (2.20mm)
Size / Dimension:	0.126" L x 0.098" W (3.20mm x 2.50mm)
Supplier Device Package:	1210
Package / Case:	1210 (3225 Metric)
Mounting Type:	Surface Mount
Inductance Frequency - Test:	7.96MHz
Operating Temperature:	-55°C ~ 125°C
Ratings:	--
Frequency - Self Resonant:	55MHz
Q @ Freq:	30 @ 7.96MHz
Series:	PM20
Shielding:	Unshielded
Current - Saturation:	--
Current Rating:	250mA
Tolerance:	±10%
Inductance:	3.9µH
Material - Core:	Ferrite
Type:	Molded
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Fixed Inductors

Fixed inductors are passive electronic components that use magnetic fields for the purpose of energy storage and transfer. As the name implies, the inductors are usually fixed, and usually steel or ferrite material is used for the core. The purpose of the inductor is to provide a path for the flow of current to be regulated and stored in the form of a magnetic field. In other words, the inductor is an electrical conductor which stores electrical energy when the current passes through it.The PM20-3R9K fixed inductor is a type of multi - layer inductor made of magnetic material, usually with ferrite, manganese, and nickel cores. It is a low-resistance device, typically 0.005 Ohms, which makes it suitable for use in a wide range of applications, including high - frequency, low-noise circuits.Typically, the PM20-3R9K fixed inductor can be used in two basic ways. The first is as a fixed-value inductor, providing constant inductance regardless of the applied voltage or current. This is useful for applications such as direct current (DC) to alternating current (AC) conversion and radiofrequency (RF) reception. The second is as a variable-value inductor, providing fine-tuned inductance with a variable current or voltage applied. This is used in applications such as switched-mode power supplies, communication systems, and motor control circuits.One of the most common applications of a fixed-value PM20-3R9K inductor is as a filter. In this context, it is used to selectively suppress certain frequencies while allowing others to pass through. The inductor is connected in series with a capacitor, and when placed in an oscillating circuit the inductor and capacitor form a resonant circuit. This allows a frequency-dependent level of attenuation to be applied, meaning certain frequencies are more strongly attenuated than others.The PM20-3R9K fixed inductor can also be used in inductive-capacitive (LC) filtering applications. Here, an inductor and a capacitor are used in series, with a voltage applied across both components. The inductor will store energy in the form of a magnetic field, while the capacitor will store energy in the form of an electric field. The combination of these two components creates a filter, allowing certain frequencies to pass through and others to be blocked.As with any electrical component, the PM20-3R9K fixed inductor has both advantages and disadvantages. The primary advantage of this inductor is its high power handling capability. The high resistance of the device results in less heat energy being dissipated, meaning it can be used in applications with a large current flow. Additionally, it is also very low-cost and can be easily integrated into existing circuits.On the other hand, the PM20-3R9K fixed inductor also has its disadvantages. The main limitation is that it is relatively insensitive to changes in current or voltage, meaning it is not suitable for use as a variable-value inductor. Additionally, due to its relatively low power handling capability, it should not be used in applications with high-power requirements.In conclusion, the PM20-3R9K fixed inductor is an extremely useful component, capable of providing filtering, energy storage, and conversion for a wide range of applications. Its primary advantages include high power handling capabilities, low cost, and ease of integration with existing circuits. However, it is limited by its insensitivity to changes in voltage or current, making it unsuitable for use as a variable-value inductor.

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