SMD200-2 Circuit Protection

Resistance - Initial (Ri) (Min):	50 mOhms
Approvals:	CSA, TUV, UL
Lead Spacing:	--
Thickness (Max):	0.118" (3.00mm)
Height - Seated (Max):	--
Size / Dimension:	0.343" L x 0.250" W (8.70mm x 6.36mm)
Package / Case:	2-SMD
Mounting Type:	Surface Mount
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	125 mOhms
Series:	PolySwitch®, SMD
Time to Trip:	12s
Current - Trip (It):	4A
Current - Hold (Ih) (Max):	2A
Current - Max:	40A
Voltage - Max:	15V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Cut Tape (CT)

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PTC Resettable Fuses

PTC resettable fuses are positive temperature coefficient devices which are designed to provide over-current protection. They are commonly used in a variety of applications, such as power supplies, communication systems, automotive systems and consumer electronics. The SMD200-2 has a variety of application fields and working principles.

Application Fields of SMD200-2

The SMD200-2 PTC resettable fuse is suitable as a protection device for many electronic circuits, such as portable equipment, communication systems, automobiles and consumer electronics. Its small size and low surge current characteristics make it suitable for use in compact devices.

Working Principle of SMD200-2

The SMD200-2 works by using a positive temperature coefficient (PTC) of conductivity. The PTC changes the resistance of the elements during over-currents, which prevents electric current from flowing through. The PTC element resistance is low when there is no over-current, and high when there is an over-current. When the current through the device drops to a low value, the PTC element will cool and the resistance will drop to a low value, allowing the device to reset.

Advantages of SMD200-2

The SMD200-2 PTC resettable fuse offers a number of advantages over other types of fuses. It is compact, meaning that it can be used in a variety of applications. The device is also fast-acting, as it can respond to excessive current in nanoseconds. In addition, it is vibration-resistant and has a low let-through voltage, meaning that the voltage that is let through the device is low enough to not cause any harm to sensitive components.

Disadvantages of SMD200-2

Despite its numerous advantages, the SMD200-2 has some limitations. As the device is unable to moderate sustained over-currents, it is important to ensure that it is used in applications where there is no possibility of sustained over-currents. In addition, the device is not able to provide over-voltage protection.

Conclusion

The SMD200-2 is a useful device for providing over-current protection. It is compact, fast-acting, and vibration-resistant. However, it is important to note that it does not provide over-voltage protection and is not suitable for applications with sustained over-currents.

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