Professional IC Distribution & Technical Solutions

Part E2023NL Manufacturer: PULSE

Specifications:

• Manufacturer: PULSE (a brand of Pulse Electronics, now part of YAGEO Group)
• Part Number: E2023NL
• Type: Common Mode Choke (CMC) / Filter
• Inductance: 20 mH (typical, per winding)
• Current Rating: 0.2 A (DC)
• DC Resistance (DCR): 4.5 Ω (max per winding)
• Voltage Rating: 50 V (DC)
• Operating Temperature Range: -40°C to +85°C
• Mounting Type: Through-Hole
• Number of Pins: 4
• Package / Case: Radial Leaded

Descriptions:

The PULSE E2023NL is a common mode choke designed for noise suppression in electronic circuits. It features two windings on a single core to filter common mode interference while allowing differential signals to pass. It is commonly used in power supply lines, data communication circuits, and other applications requiring EMI suppression.

Features:

• High common mode impedance for effective noise filtering
• Compact radial-leaded design for easy PCB mounting
• Suitable for low-current applications
• RoHS compliant
• Reliable performance in a wide temperature range

This component is ideal for reducing electromagnetic interference (EMI) in power and signal lines.

# E2023NL: Technical Analysis and Implementation Considerations

## Practical Application Scenarios

The E2023NL by PULSE is a high-performance common-mode choke designed for EMI suppression in high-speed differential signal lines, particularly in Ethernet and data communication systems. Its primary applications include:

1. Gigabit Ethernet (1000BASE-T) Systems

The E2023NL effectively attenuates common-mode noise in twisted-pair cabling, ensuring signal integrity in network switches, routers, and PHY interfaces. Its wideband suppression (up to 100 MHz) makes it ideal for high-speed data transmission.

2. PoE (Power over Ethernet) Implementations

In PoE applications, the choke balances EMI filtering while handling DC power currents. Its robust construction prevents saturation under combined data and power loads, critical for devices like IP cameras and wireless access points.

3. Industrial Communication Interfaces

The component’s high-temperature tolerance and reliability suit harsh environments, such as factory automation (PROFINET, EtherCAT) and automotive Ethernet, where noise immunity is critical.

## Common Design-Phase Pitfalls and Avoidance Strategies

1. Incorrect Current Rating Selection

*Pitfall:* Overlooking RMS current requirements in PoE applications can lead to choke saturation.

*Solution:* Verify the combined data and power current against the E2023NL’s rated 0.5 A DC current limit. Use simulation tools to model worst-case scenarios.

2. Impedance Mismatch in High-Speed Lines

*Pitfall:* Mismatched differential impedance (e.g., not maintaining 100 Ω for Ethernet) causes signal reflections.

*Solution:* Pair the choke with PCB traces designed to match the nominal impedance. Validate with TDR measurements during prototyping.

3. Thermal Management Oversights

*Pitfall:* High ambient temperatures degrade performance in enclosed spaces.

*Solution:* Ensure adequate airflow or derate the current capacity per the datasheet’s thermal derating curves.

## Key Technical Considerations for Implementation

1. Frequency Response

The E2023NL’s insertion loss profile must align with the target noise frequency range. For multi-Gigabit applications, verify attenuation above 1 GHz using S-parameter models.

2. Placement and Layout

Position the choke close to connectors or noise sources to minimize loop area. Avoid routing differential pairs near high-current traces to prevent crosstalk.

3. Regulatory Compliance

Ensure the choke meets relevant EMI standards (e.g., CISPR 32, EN 55032) for end-product certification. Test prototypes with an EMI receiver to validate suppression performance.

By addressing these factors, designers can leverage the E2023NL’s capabilities while mitigating risks in high-speed communication systems.