1. Product Introduction
The NFL21SP506X1C3D is a surface-mount EMI suppression filter developed by Murata, belonging to its renowned EMIFIL® series. Packaged in an 0805 (2012 metric) footprint, this component is designed to suppress electromagnetic interference (EMI) across a wide frequency spectrum, making it well-suited for digital and high-speed signal systems. It integrates a π-type low-pass filter structure, effectively attenuating conducted noise in the range of several MHz to several hundred MHz, thus enhancing overall system electromagnetic compatibility (EMC).
2. Key Technical Specifications
Parameter Category | Value / Description |
Part Number | NFL21SP506X1C3D |
Package Size | 0805 (2.0 × 1.25 mm) |
Rated Voltage | 50 VDC |
Insertion Loss (Typ.) | 30 dB @ 500 MHz (Differential Mode) |
DC Resistance (DCR) | ≤ 0.05 Ω (Typ.) |
Max Rated Current | 2 A |
Operating Temperature | -40°C to +85°C |
Mounting Type | Surface Mount (SMD) |
Circuit Configuration | π-Type (Inductor–Capacitor–Inductor) |
RoHS Compliance | Yes |
3. Product Features and Design Advantages
1) Integrated π-Type Topology for Enhanced Layout Consistency
The internal π-network (L-C-L) configuration consolidates two inductors and a central capacitor into a single compact component. This integrated structure eliminates impedance mismatches common in discrete layouts, improves frequency response uniformity, and simplifies PCB design.
2) High-Frequency Noise Suppression Performance
The filter delivers a typical insertion loss of 30 dB at 500 MHz, with strong suppression capabilities across 100 MHz to 1 GHz. This makes it ideal for mitigating EMI on high-speed data lines and power rails, helping end products meet stringent EMC standards.
3) Compact Size with 2 A Current Handling
Thanks to Murata’s optimized materials and winding processes, the device offers up to 2 A current capacity in a space-saving 0805 package—well-suited for EMI filtering in compact designs where power and signal lines coexist.
4. Application Scenarios
Application Area | Description |
High-Speed Interface Systems | EMI filtering for USB, HDMI, MIPI signal lines |
Mobile Devices | Noise isolation on power rails and RF paths |
Communication Modules | Front-end EMI protection in Wi-Fi, Bluetooth, GNSS |
Medical / Wearables | Conducted noise suppression on MCU/Sensor interfaces |
Industrial Control | Suppression of EMI from PWM and switching noise |
5. Series Comparison Guide
Model | Insertion Loss (Typ.) | Max Current | Voltage Rating | Frequency Range | Application Suitability |
NFL21SP506X1C3D | 30 dB @ 500 MHz | 2 A | 50 V | High-frequency EMI | Ideal for designs with coexisting power and signal lines |
20 dB @ 300 MHz | 2 A | 50 V | Mid-frequency noise | General-purpose filtering for MCU lines | |
10 dB @ 100 MHz | 3 A | 25 V | Low-frequency noise | Filtering on power/control buses |
Note: Performance values are typical. Actual effectiveness depends on PCB layout, impedance matching, and grounding strategies. System-level simulation and validation are recommended.
6. Packaging and Design Resources
This filter adopts a standard 0805 package, making it easy to deploy in space-constrained designs. On the WIN SOURCE platform, engineers can download Ultra Librarian-compatible models for use with major EDA tools such as Altium Designer, Cadence OrCAD, and others, enabling seamless BOM integration and layout verification.
The NFL21SP506X1C3D is a high-integration, surface-mount EMI filter combining compact dimensions, strong suppression at high frequencies, and robust current handling. It offers excellent value in applications where space is limited and EMI performance is critical, effectively improving signal integrity and system stability across high-speed data and power lines.
To explore more component specifications, packaging models, and inventory availability, please visit the official WIN SOURCE website.
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