72R025XU

Resistance - Initial (Ri) (Min):	1.25 Ohms
Approvals:	cURus, TUV
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.500" (12.70mm)
Size / Dimension:	0.291" Dia x 0.122" W (7.40mm x 3.10mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	3 Ohms
Series:	POLY-FUSE®, 72R
Time to Trip:	2.5s
Current - Trip (It):	500mA
Current - Hold (Ih) (Max):	250mA
Current - Max:	40A
Voltage - Max:	72V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction to PTC Resettable Fuses

PTC Resettable Fuses (also known as polyfuses or polymeric positive temperature coefficient resettable fuses) are small, chip-like devices that act as overcurrent protection in a wide variety of electronic products. When a predetermined current threshold is exceeded, the fuse will trip, interrupting the circuit, and then go into a standby mode ready for resetting. The temperature increase caused by the current causes a change in the electrical resistance of the PTC Resettable Fuse, causing it to increase. When the PTC Resettable Fuse tripped, and the current exceeded the predetermined threshold, the temperature on the device will continue rising, the resistance will increase and the device will stay in a tripped state until the current is reduced and the temperature returns to normal. Once the fuse has reset, it will become available to be used again.

72R025XU Application Field and Working Principle

The 72R025XU is a PTC Resettable Fuse that is commonly used in consumer electronic products to provide overcurrent protection. The fuse has a threshold voltage of 2.5 A, a maximum burden voltage of 5.1 V and a maximum operating temperature of 75°C. Operating within the application field of consumer-grade electronic products, the 72R025XU offers an enhanced level of protection for consumer products. The working principle of the 72R025XU PTC Resettable Fuse is similar to that of other PTC resettable fuses. It is designed to react to current-induced temperature increases by creating a change in electrical resistance, and is able to reset itself once the current drops below the threshold voltage. The working principle of the 72R025XU consists of two components: the thermal fuse and the PTC thermistor. The thermal fuse is a one-time thermal device that is triggered when the temperature of the fuse reaches its pre-programmed temperatures. During normal operation, the temperature of the fuse is kept at a lower level in order to prevent premature triggering of the thermal fuse. The PTC thermistor, on the other hand, reacts to the current induced temperature increases, providing the 72R025XU with the ability to reset itself after a current overload has been detected. When the 72R025XU is heated due to an overload in current, the PTC thermistor increases its electrical resistance. This prevents further current from passing through the fuse, effectively breaking the circuit. The thermal fuse is triggered when the fuse is heated up to a pre-programmed temperature, and it prevents further current activity beyond this point. Once the temperature of the fuse has dropped below a certain threshold, the PTC thermistor returns to its normal state, reducing the electrical resistance and allowing current to once again flow through the circuit. At this point, the 72R025XU has reset itself and is ready for use.

Conclusion

The 72R025XU is an excellent example of a PTC Resettable Fuse, providing reliable overcurrent protection for consumer-grade electronic products. Thanks to its reliable thermal protection and resetting capabilities, it is able to provide a safer and more reliable source of protection for all kinds of consumer and industrial electronic products.

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