Detailed Explanation of BLM31PG330SN1L High-Frequency Power Supply Magnetic Bead Parameters and EMI Application Guide
Product Overview
BLM31PG330SN1L is a surfacing Ferrite Bead launched by Murata, a Japanese manufacturing company, which is used to provide high-frequency noise suppression in power or signal lines. This magnetic bead provides a high impedance of 330Ω at a frequency of 100MHz, which can significantly reduce radio frequency interference (EMI) and power supply noise coupling problems. The BLM31PG series adopts high-frequency dedicated ferrite materials and is suitable for various application scenarios that require EMI filtering, power purification or signal integrity improvement.
Key parameter specifications
Parameter name specification value
Model BLM31PG330SN1L
Impedance value @100MHz 330 Ω (±25%)
Rated current (maximum) 2 A
The maximum DC resistance (DCR) is 100 mΩ
The applicable frequency range is 10 MHZ to 1GHz
Package size 1206 (3.2mm x 1.6mm x 1.6mm)
Installation method: Surface Mount (SMD)
The operating temperature range is -55°C to +125°C
Material classification: Ferrite
RoHS certification is Manufacturer Murata (Murata Manufacturing Plant)
Product features and advantages
✅ High frequency EMI suppression capability: reaching 330Ω impedance at 100MHz, with remarkable suppression effect
⚙️ Low DC impedance: up to 100mΩ, ensuring DC current is not affected by voltage drop
🔋 2A current capacity: Suitable for medium power supply noise handling
📡 Multi-band absorption: Good high-frequency energy absorption curve, suitable for a variety of EMC design requirements
🛡️ Excellent thermal stability: can operate stably within the industrial temperature range
Typical application fields
Application direction description
⚙️ Power decoupling Power pin isolation high frequency interference from ripple (DCDC, power module output terminal)
📶 Communication interface EMI filtering USB, HDMI, LVDS, CAN, Ethernet and other high-speed signal common-mode interference suppression
🧠 MCU/FPGA power supply for EMI purification of core power supply lines for SoC, processor, etc
🖥️ Consumer electronics smartphones, laptops and other high-speed circuit board EMC design optimization
🚗 Automotive electronic systems instrument, in-vehicle INFOTAINMENT, camera power supply line EMI control
Suggestions for packaging structure and layout
Package size: 3.2mm × 1.6mm × 1.6mm (Murata size code: BLM31) Installation suggestions: Arranged close to the power input/output terminal to form a "blocking path" The effect is even better when used in combination with decoupling capacitors Avoid series connection in high-speed data signal lines (unless specifically designed)
Recommendations for the same series and alternative models
Model impedance (@100 MHZ), current capacity, package features description
BLM31PG121SN1L 120Ω 3A 1206 has a lower impedance and is suitable for filtering high-current power supplies
The BLM31PG600SN1L 60Ω 4A 1206 has a lower impedance and is suitable for high-current power supply lines
BLM18KG331SN1D 330Ω 1A 0603 smaller package, suitable for light-load mobile devices
MPZ2012S331AT000 330Ω 2A 0805 TDK alternative model, with similar parameters
Summary
The BLM31PG330SN1L is a high-performance power/signal line EMI suppression magnetic bead device, suitable for noise management applications in the frequency band above 100MHz. With its high impedance, low DCR and good thermal stability, it is widely used in consumer electronics, industrial automation, power module design and EMI strategies of communication equipment. If you are looking for a ferrite bead with strong interference suppression capability on power lines or high-speed signal lines, the BLM31PG330SN1L is undoubtedly a mature and reliable choice.
