BLM18AG121SH1D: TDK surface mount beads, ideal choice for EMI suppression
Product Introduction
BLM18AG121SH1D is a Chip Ferrite Bead produced by TDK Corporation and belongs to the BLM18 series. It adopts a small 0603 package (1.6mm x 0.8mm), with an impedance of 120Ω (@100MHz), and is specially designed for filtering high-frequency noise in electronic circuits. It is particularly suitable for EMI/EMC suppression of power lines and signal lines. This device features low DC resistance, high current resistance and high impedance. Without affecting the transmission of the main signal, it effectively supsuppress interference and enhance the electromagnetic compatibility performance of the system.
Core parameters
Project parameter value
Impedance value (@100MHz) : 120Ω
The maximum DC resistance (DCR) is 0.10Ω
The maximum rated current is 2A
Operating temperature range: -55 °C to +125°C
The material composition is Ferrite
Installation method: Surface Mount (SMD)
Package size: 0603 (1.6mm x 0.8mm x 0.8mm)
Brand model: TDK/BLM18AG series
RoHS environmental protection is
Packaging and appearance diagram
Package Code: 0603 (metric 1608)
Compliant with JEDEC standards, it is suitable for automatic surface mount technology (SMT) placement machines
The standard two-end electrode structure facilitates the passage of high-frequency current
Both ends of the pads need to maintain good contact. It is recommended to use lead-free solder
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Typical application scenarios
BLM18AG121SH1D features outstanding high-frequency suppression performance and is suitable for the following circuit designs: ✅ power input filter (VCC line) ✅ the analog and digital of the MCU/SoC are separated and isolated ✅ audio circuit resistant to radio frequency interference ✅ Noise suppression for high-speed interface lines such as USB, HDMI, LVDS, MIPI, etc ✅ EMI design for consumer electronics such as mobile phones, routers and laptops ✅ anti-interference scenarios in industrial control and instrumentation
Application circuit example
+5V Power Rail | | [Magnetic Bead: BLM18AG121SH1D] | +---------> MCU / IC VCC Or for anti-interference of signal lines: Signal In | [BLM18AG121SH1D] | Signal Out Magnetic beads exhibit high impedance in the high-frequency band, effectively filtering out RF interference, digital noise, and switch ripples, etc. They are particularly suitable for use at the front end of sensitive analog circuits, power lines, and IO signal lines.
Recommended alternatives to models in the same series
Model impedance value @100MHz rated current feature
BLM18AG121SH1D 120Ω 2A is the main promoted model with good versatility
BLM18AG601SN1D has a stronger suppression capability for high-frequency interference at 600Ω 0.5A
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BLM18AG121SH1D is an SMD magnetic bead device that combines small size, strong anti-interference ability and high current capacity. It is suitable for use in terminal devices with high requirements for space and performance, effectively enhancing the system's anti-interference ability. It is a powerful tool for achieving high-reliability power supply and signal integrity design.
