The B8509 is a common mode choke manufactured by EPCOS, now part of TDK. It is designed to suppress common-mode noise in various electronic circuits. Common-mode chokes are used to attenuate unwanted noise signals that are common to multiple lines, while allowing differential signals to pass through with minimal attenuation. These chokes are crucial for electromagnetic compatibility (EMC) and electromagnetic interference (EMI) compliance.

Applications

• Power Supplies: Reducing common-mode noise in AC-DC and DC-DC power supplies.
• Data Lines: Filtering noise in USB, HDMI, Ethernet, and other data communication lines.
• Audio Equipment: Suppressing noise in audio signals for clearer sound quality.
• Automotive Electronics: Filtering noise in automotive communication and control systems.
• Industrial Equipment: Reducing noise in industrial automation and control systems.
• Telecommunications: Suppressing noise in telephone lines and communication equipment.

Features

• High Common-Mode Attenuation: Effectively reduces common-mode noise signals.
• Low Differential-Mode Attenuation: Minimizes attenuation of desired differential signals.
• Compact Size: Small footprint suitable for space-constrained applications.
• High Impedance: Provides high impedance to common-mode currents, effectively blocking noise.
• Wide Frequency Range: Operates over a broad frequency range to suppress a variety of noise signals.
• RoHS Compliant: Meets environmental standards for hazardous substances.

Benefits

• Improved EMC/EMI Compliance: Helps electronic devices meet regulatory requirements for electromagnetic compatibility.
• Reduced Noise: Suppresses unwanted noise signals, improving signal integrity and performance.
• Enhanced Signal Quality: Minimizes interference in data and audio signals, resulting in clearer communication and better sound quality.
• Increased System Reliability: Protects sensitive components from noise-induced damage.
• Simplified Design: Easy to integrate into existing circuit designs.
• Environmentally Friendly: RoHS compliance ensures that the product is free from hazardous substances.

Technical Specifications

The B8509 typically has an inductance value ranging from a few microhenries to several millihenries. The rated current is typically a few amperes. The DC resistance is usually very low, in the range of milliohms. The common-mode impedance is high over a broad frequency range. The operating temperature range is usually between -40°C and +85°C. The package is typically a through-hole or surface-mount package.