The **3216FF375-R** is a specific surface-mount technology (SMT) fuse manufactured by **Eaton (formerly Bussmann)**. It is widely used in compact electronic devices to protect against overcurrent conditions. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its physical size and electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Part Number** | 3216FF375-R | | **Package Size (EIA)** | 1206 (3.2mm x 1.6mm) | | **Current Rating** | 375 mA (0.375A) | | **Voltage Rating (DC)** | 32 VDC | | **Interrupt Rating** | 50A @ 32VDC | | **Fuse Type** | Fast-Acting (FF) | | **Material** | Fiberglass Substrate / Copper Terminals | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ## 2. Key Features * **Fast-Acting (FF):** Designed to open very quickly (within milliseconds) when an overload occurs. This protects sensitive ICs and semiconductor components that cannot tolerate prolonged overcurrent. * **Thick Film Technology:** Utilizes a metal film on a ceramic or fiberglass substrate to ensure precise melting points. * **Low Profile:** The 1206 footprint is ideal for space-constrained applications like laptops, smartphones, and tablets. * **Lead-Free:** Compliant with modern environmental standards for electronic waste. --- ## 3. Part Number Breakdown Understanding the code helps in identifying similar components: | Segment | Meaning | | :--- | :--- | | **3216** | Metric dimensions (3.2mm x 1.6mm), equivalent to **1206** imperial. | | **FF** | Very Fast-Acting (from the German *Flink-Flink*). | | **375** | The current rating in milliamps (375mA). | | **-R** | Indicates the product is RoHS compliant. | --- ## 4. Typical Applications This fuse is generally found in the secondary circuits of electronic devices rather than the main AC power line. 1. **LCD Monitors:** Protection for inverter circuits. 2. **Portable Electronics:** Battery packs and chargers for mobile phones. 3. **Computer Peripherals:** USB port protection and PCMCIA cards. 4. **Disk Drives:** Protecting the logic board from motor stalls or failures. ---