DECASMDC050F/60-2 – TYCO ELECTRONICS

Overview

The Littelfuse Inc. DECASMDC050F/60-2 is a Polymeric PTC Resettable Fuse designed for robust overcurrent protection in sensitive electronic circuits. Its primary function is to interrupt current flow when fault conditions exceed its trip threshold, safeguarding downstream components. A critical design consideration is the trade-off between its low initial resistance (200 mOhms) and its post-trip resistance (up to 1.1 Ohms); while the low initial resistance minimizes voltage drop and power dissipation in normal operation, the significantly higher post-trip resistance limits the fault current to a safe level, preventing damage but requiring manual reset or power cycling to restore functionality.

Key Features

• Maximum Operating Voltage: 60V
• Hold Current (Ih): 550 mA
• Trip Current (It): 1.1 A
• Maximum Fault Current: 10 A
• Initial Resistance (Ri): 200 mOhms (min)
• Package: 2018 (5045 Metric), Concave Surface Mount (5.01mm x 4.50mm)

Applications

The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.

• Protection of USB ports and downstream peripherals against short circuits.
• Overcurrent safeguarding in battery management systems for portable electronics.
• Input power filtering and surge suppression in compact power supplies.
• Current limiting for sensitive sensor interfaces in industrial automation.