MF-SM125-2-99 Circuit Protection

Resistance - Initial (Ri) (Min):	70 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.118" (3.00mm)
Height - Seated (Max):	--
Size / Dimension:	0.287" L x 0.214" W (7.31mm x 5.44mm)
Package / Case:	2-SMD
Mounting Type:	Surface Mount
Ratings:	AEC-Q200
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	250 mOhms
Series:	Multifuse®, MF-SM
Time to Trip:	2s
Current - Trip (It):	2.5A
Current - Hold (Ih) (Max):	1.25A
Current - Max:	100A
Voltage - Max:	15V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Discontinued at Digi-Key
Lead Free Status / RoHS Status:	--
Packaging:	Cut Tape (CT)

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PTC Resettable FusesPTC resettable fuses, also known as polyfuse, are electronic components used to protect circuits from overcurrent or overvoltage conditions. They are an alternative to traditional fuses, providing more efficient protection by automaticallyreset ting after the fault condition has cleared. A PTC resettable fuse consists of a positive temperature coefficient (PTC) element, a stud, and a heat sink.The PTC element is a polymer resistor with a rated current that changes with the temperature. When the rated current is exceeded, the device will quickly heat up and the resistance of the PTC element will increase rapidly. This in turn increases the amount of energy dissipated, limiting the current and protecting the circuit from damage. The device will remain in this condition until the fault clears and the heat dissipates, at which point it will reset itself and be ready to protect the circuit again.The stud is a metal rod that protrudes from the top of the device. It is typically connected to the input of the circuit, and it provides a way to measure the current going through the device. The heat sink is attached to the bottom of the device and helps to dissipate any heat generated by the PTC element.The MF-SM125-2-99 is a PTC resettable fuse with a rated current of 125A and a hold current of 99A. It is typically used in applications like motor drives, power supplies, and communication equipment to provide overcurrent and overvoltage protection. The device is mounted directly onto a circuit board and connected to the power supply, and it will trip when the current exceeds the rated value. After the fault clears, the device will reset itself and be ready to provide protection again.PTC resettable fuses are more efficient than traditional fuses because they provide circuit protection without needing to be replaced after each overcurrent event. This reduces maintenance costs and provides a reliable and cost-effective method of circuit protection. Furthermore, PTC resettable fuses have a low leakage current, which helps to save energy and reduce costs.In conclusion, PTC resettable fuses, such as the MF-SM125-2-99, provide reliable protection against overcurrent and overvoltage conditions. They are a cost-effective alternative to traditional fuses and can save money in the long run due to their ability to reset automatically after a fault clears. As well as providing circuit protection, they also help to save energy and reduce costs.

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