Identification methods and techniques for plug-in inductor magnetic beads?

Plug in inductor magnetic beads are often encountered in many electronic components, and when it comes to their identification methods and skills, many people do not know!

 

1、 Method for identifying the material of plug-in inductor magnetic beads?

1. Welding below 350 ℃ should not exceed 3 seconds.

2. Specially designed to suppress high-frequency noise and peak interference on signal and power lines, it also has the function of absorbing electrostatic pulses.

3. Used for RF circuits PLL 、 Oscillating circuits, memory circuits containing ultra-high frequencies (DDRX), etc. all require the addition of magnetic beads in the power input section.

1. Differentiation on the material of plug-in inductor magnetic beads:
Different magnetic bead materials have different bandwidth ranges:

R material: Maximum impedance frequency band.

S material: performance similar to ferrite magnetic beads

Material B: Suitable for high-speed digital signals.
Can suppress through holes, undershoots, and oscillations of high-speed digital signals.
D material: Low frequency loss is small, and impedance increases sharply with frequency.



2、 High and low frequency identification method for plug-in inductor magnetic beads?
But in fact, SMT inductor magnetic beads should also be able to achieve the purpose of absorbing high-frequency interference? Moreover, inductors can no longer function as inductors after high-frequency resonance. It is necessary to understand the two pathways of EMI, namely radiation and conduction, and different pathways require different suppression methods. The former uses magnetic beads, while the latter uses inductors. For the IO part of the trigger, can inductors be used to isolate the IO part from the ground of the trigger for the purpose of EMC? For example, isolating the USB ground from the ground of the trigger with a 10uH inductor can prevent insertion and removal noise from interfering with the ground plane? Inductance is generally used for circuit matching and signal quality control.
Use magnetic beads where analog and digital ground are combined. Use magnetic beads where analog and digital ground are combined. The size of the magnetic beads used between digital and analog ground, and the size of the magnetic beads (more accurately, it should be the characteristic curve of the magnetic beads), depend on the frequency of the interference waves that you need the magnetic beads to absorb. Why is the unit and resistance of the magnetic beads the same?
3、 Tips for identifying plug-in inductive magnetic beads in circuits?
Plug in inductor magnetic beads are used to absorb ultra-high frequency signals, like some RF circuits, PLL， Oscillating circuit, including ultra-high frequency memory circuit (DDR), SDRAM, RAMBUS, etc. require the addition of magnetic beads in the power input section, while inductors are energy storage components used in LC oscillation circuits, mid to low frequency filtering circuits, etc. Their application frequency range rarely exceeds 50MHz.
The direct current resistance (DCR) of a chip inductor is relatively small, and it is approximately short circuited when measured in the ohm range of a multimeter.
The chip type inductor magnetic beads are composed of soft magnetic ferrite materials, forming a single stone structure with high volume resistivity. The DC resistance is very high, and the measurement is approximately open circuit using a multimeter's ohm range.