SMD1812P150TFA

Resistance - Initial (Ri) (Min):	40 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.039" (1.00mm)
Height - Seated (Max):	--
Size / Dimension:	0.179" L x 0.128" W (4.55mm x 3.24mm)
Package / Case:	1812 (4532 Metric), Concave
Mounting Type:	Surface Mount
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	110 mOhms
Series:	POLY-FUSE®, SMD1812
Time to Trip:	500ms
Current - Trip (It):	3A
Current - Hold (Ih) (Max):	1.5A
Current - Max:	40A
Voltage - Max:	6V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction to PTC Resettable Fuses

PTC resettable fuses are safety devices used to protect circuits from overcurrent or short circuit. They are similar to traditional fuses, but they are self-resetting and do not need to be replaced after a fault. Instead, when a current threshold is exceeded, a solid-state switch within the fuse detects the overload and trips itself. This restricts current flow until the fault is cleared and the switch reset.

The SMD1812P150TFA Application Field and Working Principle

The SMD1812P150TFA is a surface mount positive temperature coefficient (PTC) resettable fuse designed for overcurrent protection in a wide range of electronic applications. It provides cost savings and improved safety over traditional fuses due to its self-resetting design. Its small size and low profile make it ideal for space-constrained applications such as mobile devices, automotive electronics, avionics, and other industrial and consumer electronics.The SMD1812P150TFA is specifically designed to protect against overcurrents from 4.5 amps up to 15 amps. The device operates according to the PTC principle, where the resistance increases with increasing temperature. When an overcurrent passes through the device, it heats up and the resistance increases, causing the device to trip and break the circuit. This prevents the circuit from drawing excessive current. Once the fault is cleared, the device cools and the resistance decreases, allowing it to reset itself and restore current flow.The SMD1812P150TFA is designed to be mounted directly on a printed circuit board (PCB). This allows the device to be easily integrated into a variety of systems and eliminates the need for external mounting hardware. Its small size and low profile makes it ideal for space-constrained applications, and its fast response time makes it suitable for high current applications where traditional fuses would not be effective.

Conclusion

The SMD1812P150TFA is a surface mount PTC resettable fuse designed for overcurrent protection. It provides improved safety and reliability compared to traditional fuses, as well as cost savings due to its self-resetting design. The device is ideal for space-constrained applications such as mobile devices, automotive electronics, avionics, and other industrial and consumer electronics. It’s fast response time and adjustable current thresholds make it suitable for a wide range of applications.

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