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The RXEF185 is a resettable fuse (also known as a polyfuse or polymeric positive temperature coefficient device) manufactured by Littelfuse, Inc. It is designed to provide overcurrent protection in various electronic circuits. When the current exceeds a certain threshold, the device increases its resistance significantly, effectively interrupting the electrical flow. Once the fault condition is removed, the device can reset automatically, allowing normal operation to resume. Functions - Overcurrent Protection: Protects electronic circuits from damage due to excessive current. - Self-Resetting: Automatically resets after the fault is cleared, eliminating the need for manual replacement. - Voltage Rating: Designed to operate within specified voltage ratings to ensure safe operation. - Compact Design: Space-saving form suitable for various applications. Applications The RXEF185 is commonly used in: - Power supply circuits - Consumer electronics - Automotive applications - Telecommunications equipment - Industrial equipment - Battery-operated devices Alternative Parts Some alternatives to the RXEF185 may include other resettable fuses or PTC devices with similar ratings, such as: - RXEF150 - RXEF200 - Bourns MF-RXEF185 or equivalent PTC devices. To find the best alternative, consider matching the voltage and current ratings as well as the physical dimensions and mounting style. Embedded Modules While the RXEF185 itself may not be an embedded module, it can be incorporated into various embedded systems that require overcurrent protection. Modules such as microcontroller boards or custom PCB designs can integrate this component for enhanced safety. Related Q&A Q1: What is the maximum operating current rating for the Littelfuse RXEF185? A1: The RXEF185 has a specific maximum operating current rating, typically around 1.85 A, but it's important to check the latest datasheet for accurate specifications. Q2: Can the RXEF185 be used in automotive applications? A2: Yes, the RXEF185 is suitable for automotive applications where resetting overcurrent protection is required, as it can handle the operating conditions found in vehicles. Q3: What happens if the RXEF185 is exposed to excessive heat? A3: If the RXEF185 is exposed to excessive heat beyond its rated temperature limit, it can lead to a permanent increase in resistance or failure of the device, which compromises its protective functionality. Q4: Is it necessary to replace the RXEF185 after a fault condition? A4: No, one of the key advantages of the RXEF185 is that it is self-resetting. Once the fault is cleared and the device cools down, it will automatically return to its normal operating state without the need for replacement. Q5: How do I select the right replacement for the RXEF185? A5: When selecting a replacement for the RXEF185, ensure that the substitute has similar voltage and current ratings, temperature characteristics, and physical dimensions. Consider other specifications such as trip time and reset time to ensure compatibility.