TDK Launches EP21 High-Current SMD Common-Mode Chokes
TDK Corporation has introduced the EP21 Series, a new range of Surface Mount Device (SMD) Common Mode Chokes designed to address the ongoing challenge in the electronics industry: integrating increased power and functionalities into devices while maintaining strict Electromagnetic Interference (EMI) control. These innovative products are specifically engineered for Low Voltage Power Electronics applications, ensuring Electromagnetic Compatibility (EMC) compliance without consuming excessive Printed Circuit Board (PCB) space.
A key differentiator of the EP21 series is its compact footprint combined with a smart mechanical design. The chokes feature underbody terminations, which significantly reduce the overall mounting footprint compared to conventional designs that require external solder pads. Additionally, a four-pin configuration enhances mechanical stability and solder joint reliability, making the series robust enough for demanding industrial and power conversion environments that experience vibrations and mechanical stresses.
Despite their small size, the EP21 series chokes offer high current capability and excellent thermal performance. They support continuous currents ranging from 20.3 A up to 35 A without derating at ambient temperatures up to +70°C. This high power handling, coupled with advanced materials like premium MnZn ferrite cores and flat wire winding, ensures high inductance, minimal conduction losses, and overall efficiency, making them ideal for modern, space-constrained power supply architectures.
Specifications
| Product | Function | Dimensions (L x W x H) | Operating Voltage | Continuous Current Range | Inductance Range | DC Resistance | Stray Inductance | Core Material | Winding Type | Max Ambient Temp (no derating) |
|---|---|---|---|---|---|---|---|---|---|---|
| EP21 Series Common-Mode Chokes | EMI Suppression, EMC Compliance | 23.8 x 17.7 mm, 21.6-22.3 mm height | Up to 48 VAC or 80 VDC | 20.3 A to 35 A | 160 µH to 640 µH | 0.44 mΩ | ~200 nH | MnZn ferrite | Flat wire | +70°C |
Key Features
- Compact physical layout measuring 23.8 x 17.7 mm with a low profile of 21.6 mm to 22.3 mm in height.
- Incorporates underbody terminations for a significantly smaller overall mounting footprint.
- Features a four-pin configuration for improved mechanical stability and solder joint reliability.
- Rated for operating voltages up to 48 VAC or 80 VDC.
- Supports continuous currents from 20.3 A up to 35 A.
- Maintains full current capacity without derating up to an ambient temperature of +70°C.
- Utilizes premium quality MnZn ferrite cores for high inductance.
- Employs flat wire winding to minimize conduction losses and maximize efficiency.
- Offers rated inductance values between 160 µH and 640 µH.
- Achieves a low DC resistance of 0.44 mΩ.
- Exhibits a stray inductance of approximately 200 nH.
- Designed to provide EMC compliance for low voltage power electronics applications.
Applications
- DC/DC converters
- Telecommunication power supplies
- Industrial automation equipment
- Low Voltage Power Electronics applications
- Electronic circuits requiring reliable EMI suppression
- Electronic circuits where high efficiency is a top priority
