Common Mode Choke Coil Film Type DLP11S/DLP11T Series (0504 Size) # Technical Documentation: DLP11TB800UL2L Common Mode Choke
*Manufacturer: Murata*
## 1. Application Scenarios
### Typical Use Cases
The DLP11TB800UL2L is a surface-mount common mode choke designed for high-frequency noise suppression in electronic circuits. Typical applications include:
- Differential signal line filtering in high-speed data interfaces
- USB 2.0/3.0 port protection for both host and peripheral devices
- HDMI/DVI display interfaces for electromagnetic interference (EMI) reduction
- Ethernet PHY circuits for common mode noise attenuation
- Power supply input filtering in switch-mode power supplies
### Industry Applications
Consumer Electronics:
- Smartphones and tablets for USB-C and high-speed data port protection
- Televisions and monitors for HDMI interface EMI suppression
- Gaming consoles for high-speed data line integrity
Automotive Electronics:
- Infotainment systems for display and communication interfaces
- ADAS (Advanced Driver Assistance Systems) sensor interfaces
- Automotive Ethernet networks for noise immunity
Industrial Equipment:
- PLC (Programmable Logic Controller) communication ports
- Industrial Ethernet switches and routers
- Measurement and control system interfaces
Telecommunications:
- Network equipment high-speed data ports
- Base station communication interfaces
- Fiber optic transceiver modules
### Practical Advantages and Limitations
Advantages:
- High impedance at target frequencies (800Ω typical at 100MHz)
- Compact 1005 size (1.0 × 0.5 mm) for space-constrained designs
- Excellent high-frequency performance up to several GHz
- Low DC resistance (0.15Ω typical) minimizing signal degradation
- High-rated current capacity (200mA) for various applications
- Automotive-grade reliability with wide temperature range (-55°C to +125°C)
Limitations:
- Limited to low-current applications (maximum 200mA)
- Not suitable for power line filtering in high-power systems
- Frequency response optimized for specific bands, may require additional filtering for broadband applications
- Sensitivity to PCB layout requiring careful implementation
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Incorrect Placement
- Problem: Placing choke too far from noise source or connector
- Solution: Position immediately after connectors or noise-generating components
Pitfall 2: Inadequate Decoupling
- Problem: Poor high-frequency performance due to insufficient grounding
- Solution: Implement proper ground planes and decoupling capacitors nearby
Pitfall 3: Signal Integrity Issues
- Problem: Differential pair mismatch causing signal degradation
- Solution: Maintain symmetrical routing and equal trace lengths
Pitfall 4: Thermal Management
- Problem: Overheating in high-current applications
- Solution: Ensure adequate copper area for heat dissipation
### Compatibility Issues with Other Components
EMI Filter Compatibility:
- Compatible with π-filters when combined with X/Y capacitors
- May require additional ferrite beads for multi-stage filtering
IC Interface Compatibility:
- Works well with most high-speed interface ICs (USB, HDMI, Ethernet PHY)
- Verify impedance matching with specific transceiver requirements
Passive Component Interactions:
- Coordinate with decoupling capacitor values and placement
- Consider interaction with termination resistors in differential pairs
### PCB Layout Recommendations
Placement Strategy:
```
[Connector] → [DLP11TB800UL2L] → [IC/Circuit] (≤10mm distance)
```
Routing Guidelines:
- Maintain differential pair symmetry with equal trace lengths
- Use controlled impedance routing
