1812L110PR

Ⅰ.Overview of 1812L110PR

The 1812L110PR is a high-reliability polymeric PTC resettable fuse under the POLY-FUSE® series, developed by Littelfuse Inc. As a key product in circuit protection solutions, it is designed for surface-mount applications, providing automatic overcurrent protection and self-resetting functionality, which is essential for safeguarding electronic circuits from damage caused by excessive current.

Ⅱ.1812L110PR Parameter

Category:Circuit Protection,PTC Resettable Fuses

Manufacturer:Littelfuse Inc.

Series:POLY-FUSE®, 1812L

Packaging:Tape & Reel

Part Status:Active

Type:Polymeric

Voltage - Max:8V

Current - Hold (Ih) (Max):1.1 A

Current - Trip (It):2.2 A

Current - Max:100 A

Time to Trip:300 ms

Resistance - Initial (Ri) (Min):40 mOhms

Resistance - Post Trip (R1) (Max):210 mOhms

Operating Temperature:-40°C ~ 85°C

Mounting Type:Surface Mount

Package / Case:1812 (4532 Metric), Concave

Size / Dimension:0.179" L x 0.128" W (4.55mm x 3.24mm)

Thickness (Max):0.028" (0.71mm)

Ⅲ.1812L110PR Main Characteristics

Polymeric PTC Technology:Utilizes polymeric positive temperature coefficient material, enabling rapid response to overcurrent (trips in 300 ms) and automatic reset once the fault is cleared, eliminating the need for manual replacement.

Reliable Current Protection:Features a maximum hold current (Ih) of 1.1 A and trip current (It) of 2.2 A, withstanding up to 100 A of maximum current to effectively protect circuits from overcurrent damage.

Low Initial Resistance:Minimum initial resistance of 40 mOhms ensures minimal power loss during normal circuit operation, maintaining efficient energy transmission.

Compact Surface-Mount Design:1812 (4532 Metric) concave package with dimensions of 4.55mm x 3.24mm x 0.71mm (max) saves PCB space, suitable for miniaturized electronic products.

Tape & Reel Packaging:Compatible with automated assembly lines, improving production efficiency and reducing assembly errors.

Controlled Post-Trip Resistance:Maximum post-trip resistance of 210 mOhms ensures effective current limitation after tripping, preventing further circuit damage.

Ⅳ.1812L110PR Application 

Home Appliances:Used in small home appliances such as Bluetooth speakers, smart bulbs, and mini fans to safeguard their power supply circuits.

Industrial Control Equipment:Integrated into PLCs (Programmable Logic Controllers),sensor modules,and industrial power supplies to provide overcurrent protection for sensitive electronic components.

Automotive Electronics:Suitable for in-vehicle USB chargers, infotainment system accessories,and small electronic modules (operating within the device's temperature range) to enhance circuit safety.

Medical Devices:Utilized in low-voltage medical equipment like portable blood pressure monitors and glucose meters,where reliable circuit protection and miniaturization are crucial.

Computer Peripherals:Incorporated into USB hubs,external hard drives,and keyboard/mouse power circuits to prevent damage from current surges.

Ⅴ.Conclusion

The 1812L110PR polymeric PTC resettable fuse from Littelfuse Inc. offers excellent overcurrent protection, self-resetting convenience, and compact design. With its reliable performance, wide temperature adaptability, and compatibility with automated assembly, it is a practical and efficient circuit protection solution for a variety of electronic applications.