Home > Industry Information > 1812L110/33MR: A PTC Chip That Safeguards Electronic Devices
1812L110/33MR is a PTC (positive Temperature Coefficient) self-resetting fuse produced by the renowned manufacturer Littelfuse.
It is based on the advanced polymer positive temperature coefficient (PPTC) technology and can automatically disconnect the circuit
when overcurrent or short circuit faults occur in the circuit, thereby protecting the circuit from damage. When the fault is eliminated,
the fuse can automatically return to the low-resistance state and reconnect the circuit, achieving an efficient and reliable circuit protection function.
Model: 1812L110/33MR
Packaging: 1812
Holding current (Ih) : 1.1A
Tripping current (It) : 1.95A
Maximum current (Imax) : 20A
Rated voltage (Vdc) : 33V
Tripping time: 0.5 seconds
Initial resistance (minimum value) : 60mΩ
Resistance value after disconnection (maximum value) : 200mΩ
Power dissipation: 0.8W
Operating temperature range: -40℃ to +85℃
Dimensions: 4.73mm×3.41mm×2mm
· Normal working condition
When the current in the circuit is within the normal range, the temperature of the PTC chip is relatively low, and its resistance value is also low.
The current can pass through normally, and the circuit works properly.
Overcurrent or short circuit faults
When overcurrent or short circuit occurs in the circuit, the current passing through the PTC chip increases sharply.
Due to the increase in current, the PTC chip heats up and its temperature rises rapidly.
As the temperature rises, the resistance value of the PTC chip increases sharply, forming a high-resistance state.
Circuit protection
The high-impedance PTC chip limits the further increase of current, thereby cutting off the circuit and protecting other components
in the circuit from damage caused by overcurrent or short circuit.
Recovery after troubleshooting
After the overcurrent or short circuit faults are eliminated, the PTC chip gradually cools down and its temperature drops.
As the temperature drops, the resistance value of the PTC chip returns to a lower level, the circuit conducts again, and it resumes normal operation.
· Automatic recovery function: Unlike traditional fuses, PTC self-recovery fuses can automatically restore circuit connections after faults are eliminated
without the need to replace components, significantly reducing maintenance costs and equipment downtime.
· Fast response: It can trip rapidly within 0.5 seconds, promptly cutting off the fault current and effectively protecting the sensitive components
in the circuit from overcurrent and short circuit damage.
· Low resistance design: The initial resistance is as low as 60mΩ, reducing energy loss in the circuit, improving the energy efficiency of the equipment,
and also helping to lower the heat generation of the equipment.
· Compatible with high-temperature solder: It is compatible with high-temperature solder, facilitating soldering and installation, enhancing production efficiency,
and also ensuring the stability of the chip in high-temperature environments.
· Comply with environmental protection standards: Compliant with RoHS standards, lead-free and halogen-free, meeting the environmental protection requirements of modern electronic devices.
Power protection: By using this chip at the power input end, it can effectively prevent damage to the equipment caused by power short circuits or overcurrent,
ensuring the stable operation of the equipment under various power conditions.
·Interface protection: For USB interfaces, charging interfaces, etc., this chip can prevent external device failures or short circuits from affecting the internal circuits and protect the core components of the devices.
·Battery protection: In the battery management system, the 1812L110/33MR chip can prevent overcharging, overdischarging or short circuit of the battery, extend the battery life and enhance the safety of the equipment.
·Peripheral device protection: In peripheral devices such as printers and scanners, this chip can protect the devices from power fluctuations and short circuits, enhancing the reliability and service life of the devices.
· Intelligence and integration: With the popularization of the Internet of Things and smart devices, circuit protection components will be more closely integrated with the
intelligent management systems of the devices. The 1812L110/33MR chip can achieve more accurate fault detection and protection by cooperating with the intelligent management system,
thereby enhancing the overall intelligence level of the equipment.
In the field of new energy and electric vehicles, the 1812L110/33MR chip can be used in battery management systems, charging piles and other equipment to protect the equipment from
overcurrent and short circuit damage and ensure the safe operation of the equipment.
· Environmental protection and sustainable development: With the enhancement of environmental awareness, circuit protection components that comply with RoHS standards will receive more attention.
The 1812L110/33MR chip, with its advanced PPTC technology, outstanding performance and wide application, has become the ideal choice for circuit protection in electronic devices.
It can not only effectively protect the circuit from overcurrent and short circuit damage, but also reduce maintenance costs through the automatic recovery function, and improve the reliability
and service life of the equipment. In digital electronic products, it plays an indispensable role and provides a solid guarantee for the safe operation of the equipment.
With the continuous development of electronic devices and changes in the market, the 1812L110/33MR chip will continue to lead the future development trend of circuit protection components
with its high performance and environmental friendliness, ensuring the stable operation of electronic devices.
Industry Information
