The SMD2920P300TF is a resettable fuse, also known as a PPTC (Polymeric Positive Temperature Coefficient) device, manufactured by Littelfuse. This component is designed to protect electronic circuits from overcurrent conditions. When an overcurrent occurs, the fuse heats up and its resistance increases sharply, limiting the current flow and protecting the downstream circuitry. Once the fault is removed, the fuse cools down and its resistance returns to a low value, allowing the circuit to resume normal operation.

Applications

• USB Ports: Used to protect USB ports from overcurrent conditions caused by faulty devices or excessive current draw.
• Power Supplies: Employed in power supplies to protect against short circuits and overloads.
• Battery Packs: Utilized in battery packs to protect against overdischarge and overcharge conditions.
• Consumer Electronics: Used in various consumer electronics devices, such as smartphones, tablets, and laptops, to protect against electrical faults.
• Automotive Electronics: Applied in automotive electronics systems to protect against overcurrents caused by wiring faults or component failures.

Features

• Resettable: Automatically resets after the overcurrent condition is removed.
• Surface Mount Device (SMD): Designed for surface mount assembly, allowing for automated manufacturing.
• Fast Trip Time: Quickly responds to overcurrent conditions, minimizing damage to protected circuitry.
• Low Resistance: Offers low resistance during normal operation, minimizing voltage drop and power loss.
• Compact Size: Small form factor allows for use in space-constrained applications.

Benefits

• Overcurrent Protection: Protects electronic circuits from damage caused by overcurrent conditions.
• Automatic Resetting: Eliminates the need to replace blown fuses, reducing maintenance costs and downtime.
• Improved Reliability: Enhances the reliability of electronic devices by preventing damage from electrical faults.
• Cost-Effective: Provides a cost-effective solution for overcurrent protection.
• Easy to Integrate: Designed for easy integration into electronic circuits.

Additional Details

The SMD2920P300TF has a hold current of 3.0A and a trip current higher than that value. It is designed to operate within a specified voltage range. The device is typically available in a 2920 surface mount package. Its operation is based on a polymeric material that changes its resistance in response to temperature increases caused by overcurrents. Consult Littelfuse's datasheet for detailed electrical specifications, application notes, and recommended soldering profiles.