Series:	PolySwitch®, SMD
Packaging:	Cut Tape (CT)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Type:	Polymeric
Voltage - Max:	60V
Current - Max:	10A
Current - Hold (Ih) (Max):	500mA
Current - Trip (It):	1A
Time to Trip:	4s
Resistance - Initial (Ri) (Min):	350 mOhms
Resistance - Post Trip (R1) (Max):	1.4 Ohms
Operating Temperature:	-40°C ~ 85°C
Ratings:	--
Mounting Type:	Surface Mount
Package / Case:	2-SMD
Size / Dimension:	0.290" L x 0.202" W (7.36mm x 5.12mm)
Height - Seated (Max):	--
Thickness (Max):	0.125" (3.18mm)
Lead Spacing:	--
Approvals:	CSA, TUV, UL

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PTC Resettable Fuses: SMD050-2 application field and working principle

PTC Resettable Fuses, also known as PolyFuses, are electronic devices designed to act as circuit protection when addressing current overloads or short-circuits. The most common application for these devices is in consumer electronics, communication, and automotive circuits, providing for short-term protection, and shut down when an overload or short-circuit occurs, allowing the user to reset the fuse. The SMD050-2 is a common PTC Resettable Fuse that can be used in many different applications. In this article, we will discuss the applications and working principles of the SMD050-2 PTC Resettable Fuse.

SMD050-2 Application Field and Working Principle

The SMD050-2 PTC Resettable Fuse is a 0.5A rated device, which allows up to 500mA of rated current to pass through the device when it is not overloaded or short-circuited. The device provides short-term protection in the event of an overload or short-circuit, and it will shut down when the current passes the maximum rated current which is 500mA. The device is available in a surface-mount design and is rated to operate effectively in temperature ranges from -40℃ to 85℃. The working principle of the SMD050-2 PTC Resettable Fuse is based on a two-layer design. The first layer is composed of a conductive polymer material which has a low resistance of around 0.5 ohms. The second layer is a ceramic material which allows electrons to pass through it, but which will resist high temperatures. When the device is not overloaded or short-circuited, the low resistance of the conductive polymer allows current to pass through the device and reach its rated current. When the current flow exceeds the rated current, the ceramic material resists the current, causing the device to shut down and no current will pass through it. This will protect the circuit from further damage and allow the user to reset the fuse. The SMD050-2 is most commonly used in consumer electronics, communication, and automotive circuits. It is an ideal device for applications that require compact and lightweight devices. The device can also be used in other applications such as medical equipment, computers, lighting, and other circuits that require short-term protection of up to 500mA.

Conclusion

In conclusion, the SMD050-2 PTC Resettable Fuse is a common device that is used in many applications such as consumer electronics, communication, and automotive circuits. It is a two-layer device composed of a conductive polymer and a ceramic material, which provides short-term protection and allows the user to reset the fuse when an over-current or short-circuit occurs. The device is lightweight and compact, and can be used in applications that require up to 500mA of short-term protection.

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