MF-R300-AP

Resistance - Initial (Ri) (Min):	20 mOhms
Approvals:	cURus, TUV
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.720" (18.30mm)
Size / Dimension:	0.472" L x 0.118" W (12.00mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	80 mOhms
Series:	Multifuse®, MF-R
Time to Trip:	10.8s
Current - Trip (It):	6A
Current - Hold (Ih) (Max):	3A
Current - Max:	40A
Voltage - Max:	30V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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PTC Resettable Fuses PTC resettable fuses are widely used in electronic product circuits today. They play an important role in safeguarding electronics and providing smoothing current during over-current situations. MF-R300-AP is one type of PTC resettable fuses that is applied in many application fields. In this article, the application fields of MF-R300-AP and its working principle will be discussed.Firstly, MF-R300-AP is a PTC resettable fuse that features a 3-terminal configuration and is designed for use in USB 3.0 and DC/DC Converter circuits to protect against over-current and short-circuits. It is widely applied in consumer electronics, such as cellphones, MP3 players and game consoles, automotive systems and other industrial applications.MF-R300-AP is composed of two components; a thermally sensitive polymeric positive temperature coefficient (PTC) element and an NTC thermistor element. The PTC element acts as both the sensing and control element. As the current in the fuse rises, the PTC element will heat up, which will then cause the NTC element to cool, resulting in a voltage drop across the fuse. As the voltage drops, the current will also drop to a safe level.The MF-R300-AP can be reset manually by pressing the reset button, which will break the thermal connection between the two components, allowing the NTC element to cool, resulting in an increase in the voltage across the fuse. This allows the current through the fuse to rise until it reaches the rated value. Once the current reaches the rated value, the PTC element will again heat up, causing a voltage drop across the fuse and stopping the current from rising. This loop will keep repeating until the current is reset manually.In addition, the MF-R300-AP has a high-temperature rating of 150℃, a low temperature of -40℃ and a rated voltage of between 6V and 18V. It also has a rated current of between 20mA and 300mA and can be used in an environment with humidity levels up to 85%.In conclusion, the MF-R300-AP is a PTC resettable fuse that is widely used in many electronic applications. It is composed of two components and can reset manually by pressing the reset button. It also has a high-temperature rating of 150℃, a low temperature of -40℃ and a rated voltage of between 6V and 18V. In addition, it has a rated current of between 20mA and 300mA and can be used in an environment with humidity levels up to 85%. All of these features make the MF-R300-AP an ideal device for protecting electronic circuits from over-currents and short-circuits.

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