MCR12DSMT4G is a 12V, 200mA, surface-mount Polymeric Positive Temperature Coefficient (PPTC) Resettable Fuse manufactured by Littelfuse. It is a single use device, which means that it must be replaced after it fails or tripped. This fuse is RoHS compliant and features an operating temperature range from -55°C to 125°C, making it suitable for use in a wide range of applications. The device provides improved thermal performance with excellent noise immunity and lower off-state leakage current compared to conventional resettable fuses. It can be used in applications that require fire and overcurrent protection, such as automotive, telecommunications, consumer electronics and transportation.