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Ferrite Beads and Chips

Category Introduction

Ferrite cores are devices that are designed to prevent high frequency noise or EMI (electromagnetic interference). These ferrite cores are made to be placed within an electric circuit. Key characteristics are the filter type (differential, signal, or power), number of lines, max current rating, impedance and a specified frequency, and mounting type (free hanging, surface mount, or through-hole).

Product List

1 Items
PDF Mfr Part # Quantity
Available		 UnitPrice RFQ Series Packaging Product StatusFilter TypeNumber of LinesImpedance @ FrequencyCurrent Rating (Max)DC Resistance (DCR) (Max)RatingsOperating TemperaturePackage / CaseMounting TypeHeight (Max)Size / DimensionFeatures
BLM21PG221SN1D
BLM21PG221SN1D
FERRITE BEAD 220 OHM 0805 1LN
Murata Electronics
 4,759 $0.10
EMIFIL®, BLM21 Tape & Reel (TR) ActivePower Line1220 Ohms @ 100 MHz2A45mOhm--55°C ~ 125°C0805 (2012 Metric)Surface Mount0.041" (1.05mm)0.079" L x 0.049" W (2.00mm x 1.25mm)-

About Ferrite Beads and Chips

What are Ferrite Beads and Chips?

Ferrite Beads and Chips

Ferrite beads and chips are passive electronic components used primarily for noise suppression in electronic circuits. These components work by filtering out high-frequency electromagnetic interference (EMI) and radio frequency interference (RFI) from power lines and signal lines, ensuring the smooth operation of electronic devices. The basic operating principle involves the use of ferrite material, which is a type of ceramic compound composed of iron oxide mixed with metallic elements. When placed around a conductor, ferrite beads and chips act as a low-pass filter, allowing low-frequency signals to pass while attenuating high-frequency noise through resistive and inductive losses.

Types of Ferrite Beads and Chips

1. Surface-Mount Ferrite Beads

Surface-mount ferrite beads are designed for easy integration onto printed circuit boards (PCBs). They are compact and suitable for high-density applications. These beads are typically used in digital circuits to suppress high-frequency noise and are characterized by their impedance ratings at specific frequencies.

2. Through-Hole Ferrite Beads

Through-hole ferrite beads are used in applications where mechanical stability and robustness are required. They are inserted into drilled holes on PCBs and soldered in place. These beads are ideal for power supply lines and are known for their ability to handle higher current levels compared to surface-mount variants.

3. Ferrite Chip Beads

Ferrite chip beads are similar to surface-mount beads but are specifically designed for high-frequency applications. They offer a wide range of impedance values and are used in RF circuits to suppress unwanted signals. Their small size makes them suitable for compact electronic devices.

How to choose Ferrite Beads and Chips?

When selecting ferrite beads and chips, several key parameters should be considered:

  • Impedance: Choose a bead with the appropriate impedance at the frequency of interest to ensure effective noise suppression.
  • Current Rating: Ensure the bead can handle the maximum current in the circuit without saturation.
  • Size and Form Factor: Consider the available space on the PCB and the required mechanical stability.
  • Temperature Range: Select beads that can operate within the environmental temperature range of the application.

To evaluate product quality and reliability, consider the supplier's reputation, compliance with industry standards, and availability of technical support. Environmental factors such as humidity and temperature variations should be considered during installation to ensure long-term performance.

Applications of Ferrite Beads and Chips

1. Consumer Electronics

In consumer electronics, ferrite beads and chips are used to suppress EMI in devices such as smartphones, tablets, and laptops. They ensure that these devices operate without interference from external noise sources, enhancing performance and user experience.

2. Automotive Industry

In the automotive industry, ferrite beads are employed in electronic control units (ECUs) and infotainment systems to prevent EMI from affecting vehicle electronics. They help maintain the reliability and safety of automotive systems.

3. Telecommunications

Telecommunications equipment, such as routers and modems, use ferrite beads to filter out high-frequency noise from power and signal lines, ensuring clear and stable communication signals.

4. Industrial Automation

In industrial automation, ferrite beads are used in control systems and machinery to minimize EMI, ensuring accurate and reliable operation of sensors and actuators in harsh environments.

5. Medical Devices

Medical devices, such as imaging equipment and patient monitors, incorporate ferrite beads to reduce EMI, ensuring precise measurements and preventing interference with other medical equipment.