## Detailed Overview of FSMD100-33-2016-R The **FSMD100-33-2016-R** is a Surface Mount Device (SMD) Resettable Fuse, specifically a **Polymer Positive Temperature Coefficient (PPTC)** device. It is designed to protect electronic circuits from overcurrent and short-circuit conditions. ### Technical Specifications The following table outlines the primary electrical and physical characteristics of this component: | Parameter | Value / Specification | | :--- | :--- | | **Type** | PPTC (Resettable Fuse) | | **Package Size** | 2012 (Metric) / 0805 (Imperial) | | **Hold Current ($I_{hold}$)** | 1.00 A | | **Trip Current ($I_{trip}$)** | 1.95 A | | **Max Voltage ($V_{max}$)** | 6.0 V | | **Max Current ($I_{max}$)** | 40 A | | **Resistance Range ($R_{min}$ - $R1_{max}$)** | 0.040 $\Omega$ - 0.230 $\Omega$ | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### Key Features and Functionality 1. **Resettable Protection:** Unlike traditional fuses that "blow" and must be replaced, the PPTC increases its resistance dramatically when an overcurrent occurs. Once the fault is cleared and the power is cycled, the device cools down and returns to a low-resistance state. 2. **Compact Form Factor:** The **2012 (0805)** package size is standard for high-density PCB designs, making it ideal for portable electronics. 3. **Fast Trip Time:** It reacts quickly to faults to prevent damage to sensitive downstream components. 4. **Low Resistance:** In normal operation, it has very low insertion loss, ensuring minimal voltage drop across the fuse. ### Typical Applications The FSMD100-33-2016-R is commonly found in circuits where space is limited and current requirements are around 1A, such as: * **USB Ports:** Protection for USB peripherals and hubs. * **Battery Packs:** Overcurrent protection for Li-ion or NiMH cells. * **Motherboards:** Protecting I/O ports and power rails. * **Consumer Electronics:** PDAs, digital cameras, and portable media players. --- ### Typical Circuit Integration When integrating this part into a schematic, it is placed in series with the load. ```mermaid graph LR A[Power Source] --> B[FSMD100-33] B --> C[Load/Circuitry] C --> D[Ground] ```