The BLM18KG121JH1D is a high-performance SMD ferrite bead manufactured by Murata Manufacturing Co., Ltd. Belonging to the EMIFIL BLM18KG series, this chip ferrite bead features a nominal impedance of 120Ω at 100MHz, an impedance tolerance of ±25%, and a rated current of 1.9A, providing effective electromagnetic interference (EMI) and high-frequency noise suppression for electronic power supply circuits.
Designed for automotive electronic applications, the BLM18KG121JH1D meets AEC-Q200 reliability testing requirements. Its maximum initial DC resistance of 30mΩ helps reduce voltage drops and conduction losses while maintaining effective high-frequency noise filtering performance.
The device features a compact 0603 (1608 Metric) package with nominal dimensions of 1.6 × 0.8 × 0.6mm. Its low-profile construction supports space-efficient PCB layouts and automated surface-mount assembly.
With an operating temperature range of -55°C to +150°C, the BLM18KG121JH1D is suitable for automotive electronic modules and industrial applications requiring high-temperature operating capability. Its rated current must be derated according to the manufacturer’s temperature derating curve.
This ferrite bead is designed to suppress unwanted high-frequency noise on power supply lines, helping improve electromagnetic compatibility and reduce interference in sensitive electronic circuits.
Key Features:
- Manufacturer: Murata Manufacturing Co., Ltd.
- Part Number: BLM18KG121JH1D
- Product Series: EMIFIL BLM18KG
- Product Category: Ferrite Beads and Chips
- Product Type: SMD Ferrite Bead
- Filter Type: Power Line EMI Suppression
- Impedance: 120Ω at 100MHz
- Impedance Tolerance: ±25%
- Rated Current: 1.9A at 125°C
- Maximum Initial DC Resistance (DCR): 30mΩ
- Maximum DCR After Reliability Testing: 40mΩ
- Operating Temperature: -55°C to +150°C
- Package: 0603 (1608 Metric)
- Nominal Dimensions: 1.6 × 0.8 × 0.6mm
- Maximum Component Height: 0.75mm
- Number of Circuits: 1
- Polarity: Non-Polarized
- Automotive Reliability Standard: AEC-Q200
- Mounting Type: Surface Mount (SMD/SMT)
- Packaging: Paper Tape and Reel
- Standard Reel Quantity: 4,000 Pieces
Typical Applications:
- Automotive electronic control units (ECUs)
- Automotive power supply filtering
- EMI and high-frequency noise suppression
- Industrial automation and control equipment
- Automotive sensor and control modules
- Power management circuits
- Communication and networking equipment
- Embedded electronic systems
- High-density PCB assemblies
The Murata BLM18KG121JH1D combines effective high-frequency EMI suppression, low DC resistance, compact 0603 packaging, and AEC-Q200 reliability characteristics to support automotive and industrial electronic designs.
Its 120Ω impedance at 100MHz, 1.9A rated current, and low-profile surface-mount construction make it a practical choice for electronic manufacturers, automotive electronics developers, and component procurement professionals seeking reliable ferrite bead solutions.
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