The WSL1206R0400FTA5 is a power metal strip resistor manufactured by Vishay. It's designed for applications requiring accurate current sensing, voltage division, and pulse handling capabilities. With a resistance value of 0.04 ohms (40 milliohms) and a tolerance that is not explicit in the part number itself, but generally high precision for this series, this resistor provides a stable and reliable solution for demanding circuit designs.

Applications:

• Current sensing in power supplies and motor control circuits.
• Overcurrent protection circuits.
• Voltage regulation in DC-DC converters.
• Battery management systems in portable devices.
• Automotive electronic control units (ECUs).

Features:

• Power Metal Strip construction for low inductance.
• Resistance value: 0.04 ohms (40 mΩ).
• Small 1206 surface mount package.
• High power rating (consult datasheet for exact value).
• Low Thermal EMF.
• RoHS compliant.

Benefits:

• Highly accurate current sensing due to its low resistance and precision construction.
• Improved efficiency in power management applications.
• Reduced board space requirements with the small 1206 package.
• Enhanced reliability in harsh operating environments.
• Suitability for automated assembly.

Additional Details:

The 'FTA5' suffix in the part number likely refers to specific packaging and/or termination characteristics. The power rating for this resistor will depend on the substrate and ambient temperature conditions. Consult the Vishay datasheet for the WSL1206 series for detailed specifications, including power derating curves and temperature coefficient of resistance (TCR) values. The resistor's solid metal element construction provides excellent surge handling capabilities. Proper soldering techniques are recommended to ensure optimal performance and long-term reliability.