MF-SM150-2-99 Circuit Protection

Resistance - Initial (Ri) (Min):	60 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.118" (3.00mm)
Height - Seated (Max):	--
Size / Dimension:	0.344" L x 0.264" W (8.75mm x 6.71mm)
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:	5s
Current - Trip (It):	3A
Current - Hold (Ih) (Max):	1.5A
Current - Max:	100A
Voltage - Max:	15V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Not For New Designs
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable Fuses

The MF-SM150-2-99 is a type of PTC resettable fuse. A PTC resettable fuse is like a regular fuse, but with a twist. A PTC fuse is designed to reset itself after a certain amount of time after the overcurrent concludes, making it reusable. This overcurrent protection makes it ideal for use in low voltage systems, as it prevents the kind of damage that would occur with a regular fuse.

Application Field

PTC resettable fuses are used in a wide range of applications, but they can be particularly effective in low voltage systems, such as consumer electronics, automotive, telecommunications, and computers. They are also used in domestic appliances such as washing machines, dishwashers, and tumble dryers.

Working Principle

PTC resettable fuses work by having two parts: a conductive base metal and a PTC element. The conductive base metal is in contact with both poles, and when it detects an overcurrent, it activates the PTC element.The PTC element is a High Temperature Polymer Film, which then begins to heat up and act as a resistor, thus limiting the current. The higher the voltage, the higher the resistance of the PTC element. As the current stays above a certain threshold, the temperature keeps rising, and eventually the device will trip and break the circuit.Once the overcurrent stops, the PTC element cools down and will reset itself. This process is designed to happen multiple times, and the device should reset itself each time. This makes the PTC resettable fuse reusable, as it will reset again and again until it is replaced.

Advantages

PTC resettable fuses offer several advantages over regular fuses. They are more reliable, as they can reset themselves, so they are not affected by the same temperature conditions or vibration issues that can affect regular fuses. They also offer higher current ratings, so they can handle more demanding applications.Finally, they are more cost-effective, as one PTC resettable fuse can be used multiple times, making them more cost-effective in the long run.

Conclusion

PTC resettable fuses are a great choice for low voltage systems, as they offer reliable protection and can be reused multiple times. They are also easily replaceable, so they can be used for multiple applications. The MF-SM150-2-99 is an example of one such fuse, and it can be used in a wide range of applications.

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