BLM18EG101TN1D: Technical Guide to Murata 100Ω Ferrite Bead

Introduction

The BLM18EG101TN1D is a chip ferrite bead manufactured by Murata in standard 0603 package (1.6mm × 0.8mm), providing 100Ω impedance at 100 MHz with 2A rated current for effective EMI suppression in power supply filtering, signal conditioning, and noise reduction applications across consumer electronics, industrial equipment, and automotive systems.

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Technical Overview

Core Specifications

Parameter	Specification
Impedance @ 100 MHz	100Ω ±25%
DC Resistance	0.035Ω max
Rated Current	2A
Package	0603 (1.6×0.8×0.8mm)
Operating Temp	-55°C to +125°C
Material	NiZn ferrite

Part Number Decoder

BLM18EG101TN1D:

• BLM = Chip ferrite bead series
• 18 = 0603 size code
• EG = Impedance/current grade
• 101 = 100Ω @ 100 MHz
• TN1D = Tolerance/packaging

Key Features

High Current Rating:

• 2A rated current (vs 1A for BLM18KG)
• Supports mainstream power rails
• Lower temperature rise
• Suitable for high-current applications

Low DC Resistance:

• 0.035Ω minimizes voltage drop
• At 2A: 70 mV drop, 140 mW dissipation
• Excellent for power filtering

Standard 0603 Package:

• Industry-standard footprint
• Automated assembly compatible
• Good thermal dissipation
• Easy hand soldering

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Complete Specifications

Electrical Specifications

Parameter	Value	Tolerance
Impedance @ 100 MHz	100Ω	±25% (75-125Ω)
DC Resistance	0.035Ω	Maximum
Rated Current	2A	Continuous
Saturation Current	~4A	Z drops 30%

Frequency Response

Impedance vs Frequency:

• 10 MHz: ~30-40Ω
• 100 MHz: 100Ω (peak effectiveness)
• 300 MHz: ~150-180Ω
• 1 GHz: ~120-140Ω
• Effective range: 10 MHz - 2 GHz

Insertion Loss (50Ω System)

@ 100 MHz:

IL (dB) = 20 × log₁₀[(100Ω + 100Ω) / 100Ω]
        = 20 × log₁₀(2.0)
        = 6.0 dB attenuation

Typical Performance:

• 10 MHz: 2-3 dB
• 100 MHz: 6 dB
• 300 MHz: 9-11 dB
• 1 GHz: 7-9 dB

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Applications

Power Supply Filtering

Switching Regulator Output:

DC-DC Converter Output
    ↓
   [BLM18EG101TN1D]
    ↓
   10μF (bulk) → 0.1μF (bypass) → VCC_clean
    ↓              ↓
   GND            GND

Function: Suppresses switching noise
Current: Up to 2A continuous
Voltage drop: 70 mV @ 2A

Applications:

• Buck/boost converter output filtering
• Multi-rail power isolation
• USB power conditioning
• Battery-powered devices

Signal Line Filtering

High-Speed Interface Protection:

• USB 2.0/3.0 data lines
• HDMI signal conditioning
• PCIe differential pairs
• Ethernet PHY filtering

Benefits:

• Reduces EMI radiation
• Improves signal integrity
• Meets EMC compliance

Multi-Rail Isolation

Domain Separation:

VCC_main ──┬── FB1 ──► VCC_digital (2A)
           │
           ├── FB2 ──► VCC_analog (1A)
           │
           └── FB3 ──► VCC_RF (0.5A)

Each FB = BLM18EG101TN1D
Prevents crosstalk between domains

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Design Guidelines

PCB Layout

Placement:

• Place near noise source (regulator output)
• Add bulk capacitor before ferrite bead
• Add bypass capacitor after ferrite bead
• Component spacing: <5mm

Recommended Footprint (0603):

  ┌─────┐ 1.6mm ┌─────┐
  │ Pad │←─────→│ Pad │
  └─────┘       └─────┘
    0.8mm         0.8mm
    (width)       (width)
  
Pad spacing: 0.8mm
Solder mask: 0.1mm clearance

Thermal Management

Power Dissipation @ 2A:

P = I² × DCR
  = (2A)² × 0.035Ω
  = 0.14W = 140 mW

Temperature rise: ~20-25°C (typical)
Safe for continuous 2A operation

Derating:

• 85°C ambient: consider 80% derating (1.6A)

• Enclosed designs: improve airflow or derate
• High-reliability: operate at 70-80% rated current

Component Selection

BLM18E Series Comparison:

Part Number	Impedance	DCR	Current	Use Case
BLM18EG060TN1D	60Ω	0.025Ω	3A	Lower impedance, higher current
BLM18EG101TN1D	100Ω	0.035Ω	2A	Balanced
BLM18EG121TN1D	120Ω	0.045Ω	1.5A	Higher impedance
BLM18EG221TN1D	220Ω	0.10Ω	1A	Maximum filtering

Selection Guide:

• Lower current (<1A): Use higher impedance (220Ω, 330Ω)
• Medium current (1-2A): BLM18EG101TN1D ideal
• High current (>2A): Use 60Ω or larger package (0805)

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Comparison & Alternatives

vs BLM18KG121TN1D

Feature	BLM18EG101TN1D	BLM18KG121TN1D
Impedance	100Ω	120Ω
DCR	0.035Ω	0.15Ω
Rated Current	2A	1A
Voltage Drop @ 1A	35 mV	150 mV
Best For	High current	Lower current

Recommendation: BLM18EG101TN1D better for >1A applications.

Competitive Alternatives

Manufacturer	Part Number	Package	Impedance	Current
Murata	BLM18EG101TN1D	0603	100Ω	2A
TDK	MPZ1608S101C	0603	100Ω	2A
Taiyo Yuden	FBMJ1608HS101-T	0603	100Ω	2A

Conclusion

The BLM18EG101TN1D delivers reliable 100Ω EMI suppression with 2A current rating in industry-standard 0603 package, providing excellent balance between filtering performance and low DC resistance (0.035Ω) for power supply applications. With wide frequency response (10 MHz - 2 GHz) and proven reliability, it enables effective noise reduction while maintaining signal integrity and minimal power loss.

Key Advantages:

✅ 2A Current Rating: Supports mainstream power rails
✅ Low DCR (0.035Ω): 70 mV drop at 2A
✅ 100Ω @ 100 MHz: Effective EMI suppression
✅ Standard 0603: Easy assembly and availability
✅ Wide Temp (-55 to +125°C): Industrial-grade
✅ Murata Quality: Industry-leading reliability

Designing EMI-compliant systems? Visit AiChipLink.com for ferrite bead selection and EMC design consultation.

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Written by Jack Elliott from AIChipLink.

 

AIChipLink, one of the fastest-growing global independent electronic   components distributors in the world, offers millions of products from thousands of manufacturers, and many of our in-stock parts is available to ship same day.

 

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