Compact 4.7 µH inductor in 0805 surface-mount package
Manufacturer： murata
# Introduction to the LQM21PN4R7MGRD Product Series
## 1. Overview
The LQM21PN4R7MGRD belongs to a high - performance product series of inductors. Inductors are fundamental passive electronic components that play a crucial role in various electronic circuits, and this particular series is designed to meet the demanding requirements of modern electronic applications.
## 2. Key Specifications
### Inductance Value
The "4R7" in the model number indicates an inductance value of 4.7 μH (microhenries). This inductance value is carefully calibrated to provide the appropriate magnetic field storage and energy transfer capabilities within a circuit. It is suitable for a wide range of applications where specific inductive reactance is required to control current flow and filter out unwanted frequencies.
### Tolerance
The "M" in the model represents a tolerance of ±20%. This means that the actual inductance value of the LQM21PN4R7MGRD inductor can vary within the range of 3.76 μH to 5.64 μH. While a ±20% tolerance might seem relatively large, it is often acceptable in many general - purpose applications where a certain degree of variation in inductance does not significantly affect the overall performance of the circuit.
### DC Resistance (DCR)
The DC resistance of the inductor is an important parameter as it affects the power loss in the circuit. The LQM21PN4R7MGRD is designed to have a relatively low DC resistance, which helps to minimize power dissipation in the form of heat. This is especially important in power - sensitive applications where efficiency is a key concern.
### Rated Current
The inductor has a specified rated current, which is the maximum continuous current that it can handle without exceeding its temperature rise or experiencing significant changes in its electrical characteristics. This rated current is carefully determined based on the inductor's construction and materials, ensuring reliable operation under normal operating conditions.
## 3. Construction and Design
### Size and Package
The LQM21PN4R7MGRD is typically available in a compact surface - mount package. The small size makes it suitable for use in densely populated printed circuit boards (PCBs), such as those found in mobile devices, tablets, and other portable electronics. The surface - mount design allows for easy and automated assembly on the PCB, reducing production time and costs.
### Core Material
The inductor uses a high - quality core material that is carefully selected to provide excellent magnetic properties. The core material helps to enhance the inductance value and reduce magnetic losses, resulting in improved overall performance. The choice of core material also affects the inductor's temperature stability and frequency response.
### Winding
The winding of the inductor is made of high - conductivity wire, which is wound around the core in a precise manner. The number of turns and the winding pattern are optimized to achieve the desired inductance value and electrical characteristics. The winding is also designed to have good mechanical stability, ensuring that it can withstand the stresses of the manufacturing process and normal operation.
## 4. Applications
### Power Supply Circuits
In power supply circuits, the LQM21PN4R7MGRD can be used as a filter inductor. It helps to smooth out the DC output voltage by reducing the ripple component. By storing and releasing energy in the magnetic field, the inductor can effectively filter out high - frequency noise and fluctuations in the power supply, providing a stable and clean power source for other components in the circuit.
### RF (Radio Frequency) Circuits
In RF circuits, the inductor can be used in impedance matching networks, resonant circuits, and filters. Its specific inductance value and frequency response characteristics make it suitable for tuning and filtering RF signals. For example