The SMD1812P110TF/24 is a resettable fuse, also known as a polymeric positive temperature coefficient (PPTC) thermistor, manufactured by Ruilongyuan Electronics Co., Ltd. It's designed to protect electronic circuits against overcurrent conditions. This surface-mount device (SMD) helps prevent damage to sensitive components by limiting the flow of current during a fault and automatically resetting once the fault is cleared.

Applications

• USB port protection
• Mobile phones and smartphones
• Tablets and laptops
• Gaming consoles
• Wearable devices (smartwatches, fitness trackers)
• Power supply protection
• General electronic circuit protection

Features

• Surface mount device (SMD) packaging for automated assembly
• Resettable overcurrent protection
• Fast trip time
• Low resistance
• Compact size (1812 footprint)
• RoHS compliant

Benefits

• Protects electronic circuits from overcurrent damage
• Reduces warranty claims due to electrical faults
• Eliminates the need for manual fuse replacement
• Increases product reliability
• Saves board space compared to traditional fuses
• Helps meet regulatory requirements for safety

Additional Details

The '1812' in the part number refers to the device's physical dimensions in inches (0.18 inch x 0.12 inch). The 'P110' likely indicates a holding current of 1.1 Amps and a trip current that is higher. The /24 likely refers to the packaging (e.g., reel size). PPTC resettable fuses operate by increasing their resistance significantly when the current exceeds a certain threshold. This limits the current flow and protects the circuit. Once the overcurrent condition is removed, the device cools down and its resistance returns to a low value, allowing normal operation to resume. It's important to consult the manufacturer's datasheet for precise electrical characteristics (e.g., holding current, trip current, trip time, maximum voltage) and application guidelines to ensure proper selection and use of the device.

The device should be reflow soldered according to industry standards. Storage conditions should also be adhered to as specified by the manufacturer.