FEMTOSMDC012F-2 Circuit Protection

Resistance - Initial (Ri) (Min):	1.1 Ohms
Approvals:	CSA, UL
Lead Spacing:	--
Thickness (Max):	0.030" (0.75mm)
Height - Seated (Max):	--
Size / Dimension:	0.063" L x 0.032" W (1.60mm x 0.80mm)
Package / Case:	0603 (1608 Metric), Concave
Mounting Type:	Surface Mount
Ratings:	--
Operating Temperature:	--
Resistance - Post Trip (R1) (Max):	5.8 Ohms
Series:	PolySwitch®, femtoSMDC
Time to Trip:	100ms
Current - Trip (It):	300mA
Current - Hold (Ih) (Max):	120mA
Current - Max:	40A
Voltage - Max:	9V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction:
PTC resettable fuses are a type of electrically controlled protection devices that are designed to protect electronic components from environment and electrical hazards. A PTC resettable fuse consists of a circuit breaker and a PTC device, which have become the mainstay of electronic protection systems. The FEMTOSMDC012F-2 is one such device designed to protect electronic components. This article will discuss the application fields and working principle of FEMTOSMDC012F-2.

Application Field:
FEMTOSMDC012F-2 has become one of the most popular PTC resettable fuses and is widely utilized for providing over-current protection as well as over-temperature protection in consumer electronic equipment or automotive electronics. It is specifically designed for use in a variety of battery-powered devices such as cell phones, tablets, and laptops, as well as for applications that require over-current and over-temperature protection like DC power supply, LED lighting, automotive electronics, and other electronic equipment. FEMTOSMDC012F-2 is also suitable for use in extreme temperature and humidity applications.

Working Principle:
The working principle of FEMTOSMDC012F-2 is simple: when the device is subjected to an over-current situation, the PTC element inside the device heats until a predetermined temperature is reached. This temperature causes a change in resistance and causes the device to open. When the over-current situation is removed, the device then cools off and automatically resets. This is why the device is referred to as a ‘resettable’ fuse, since once removed it will automatically reset itself, replacing any defective or damaged components.

Conclusion:
FEMTOSMDC012F-2 is a popular PTC resettable fuse that is widely used in a variety of applications to provide both over-current and over-temperature protection. Its working principle is simple: when a device is subjected to an over-current situation, its PTC element heats up until a predetermined temperature is reached, which causes a change in resistance and causes the device to open. This has the benefit of protecting electronic components from environmental and electrical hazards while also providing a resetting mechanism to replace any defective or damaged components.

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