BLM21PG221SN1D

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на Апрель 30, 2025

BLM21PG221SN1D: A comprehensive analysis of Murata’s high-performance ferrite beads

BLM21PG221SN1D is a ferrite bead designed to suppress high-frequency noise launched by Murata. It belongs to the power line filter in its EMIFIL series. The device adopts 0805 (2012 metric) package, which is suitable for surface mounting (SMT). It has the characteristics of high impedance, low DC resistance (DCR) and wide operating temperature range. It is widely used in power management, high-speed signal line filtering and industrial equipment.

Core technical parameters

✅✅✅Impedance characteristics

Operating temperature range -55°C ~ +125°C, covering industrial and consumer application requirements.

The impedance is 220Ω (tolerance ±25%) at a frequency of 100MHz, which effectively absorbs high-frequency electromagnetic interference (EMI).

The frequency response curve shows: it is close to short circuit at low frequency (<10MHz), and the impedance gradually increases at medium and high frequencies (10MHz–1GHz). After exceeding 1GHz, it gradually decreases due to the parasitic capacitance effect.

✅✅✅Current and power consumption

Rated current: 2A (at 85℃), derated to 1.25A at 125℃, suitable for high current power lines.

DC resistance (DCR): maximum 45mΩ, significantly reducing low-frequency power loss and improving energy efficiency.

✅✅✅Package and size

The package size is 0805 (2.0mm×1.25mm×1.05mm), which complies with EIA standards and is suitable for high-density circuit design.

✅✅✅Environmental adaptability

Operating temperature range -55°C ~ +125°C, covering industrial and consumer application requirements.

Performance advantages

✅✅✅ High-frequency noise suppression: Ferrite materials have high impedance characteristics at high frequencies, which can effectively absorb EMI noise in power lines or signal lines, especially suitable for switching power supplies, DC-DC converters and other scenarios.

✅✅✅Low-loss design: Low DCR characteristics (45mΩ) reduce power loss in high-current applications, while supporting circuit layout without grounding, simplifying PCB design.

✅✅✅High reliability

Nickel-grid structure external electrodes are used, with excellent welding heat resistance and adaptable to reflow soldering process.
Murata’s strict quality control standards ensure the long-life stability of devices in harsh environments.

Typical application scenarios

✅✅✅Power supply filtering
- High-frequency noise suppression of switching power supplies and DC-DC converters to improve system stability.
- High-current scenarios such as car chargers and industrial power modules.
✅✅✅Signal integrity protection
- EMI protection of high-speed signal lines (such as USB 3.0, HDMI, PCIe) to reduce data transmission interference.
- Noise suppression of RF circuits, clock lines and sensor interfaces.
✅✅✅Signal integrity protection
- EMI protection of high-speed signal lines (such as USB 3.0, HDMI, PCIe) to reduce data transmission interference.
- Noise suppression of RF circuits, clock lines and sensor interfaces.

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