The term **1663** is most commonly associated with a specific surface-mount technology (SMT) package size for electronic components, specifically resistors and capacitors. It refers to the physical dimensions of the component in the metric system. --- ### 1. Understanding the 1663 Package Size In the electronics industry, component sizes are described using either Imperial or Metric codes. The **1663** code is a metric designation. | Property | Value (Metric) | Value (Imperial Equivalent) | | :--- | :--- | :--- | | **Length** | 1.6 mm | 0.063 inches | | **Width** | 0.63 mm | 0.024 inches | | **Common Name** | **Metric 1663** | **Imperial 0603** | ### 2. Common Components in 1663 (0603) Format The 1663 (Metric) / 0603 (Imperial) size is one of the most popular footprints in modern electronics because it strikes a balance between being small enough for high-density boards and large enough to be handled by standard pick-and-place machines. #### A. Resistors * **Power Rating:** Typically rated for **0.1W (1/10th Watt)**. * **Usage:** Used in almost all consumer electronics (smartphones, motherboards). * **Marking:** Often have a 3-digit or 4-digit code printed on the top to indicate resistance value. #### B. Capacitors (MLCC) * **Type:** Multi-Layer Ceramic Capacitors. * **Voltage:** Usually ranges from 6.3V to 50V. * **Marking:** Usually unmarked due to their small size; identified by packaging labels. ### 3. Technical Specifications Comparison To see where the 1663 fits in the hierarchy of component sizes: | Metric Code | Imperial Code | Dimensions (mm) | Typical Use Case | | :--- | :--- | :--- | :--- | | 1005 | 0402 | 1.0 x 0.5 | Smartphones / Ultra-portable | | **1608 (or 1663)** | **0603** | **1.6 x 0.8 / 0.63** | **General Consumer Electronics** | | 2012 | 0805 | 2.0 x 1.25 | Power supplies / Hobbyist boards | | 3216 | 1206 | 3.2 x 1.6 | High power applications | --- ### 4. Why use the 1663 (0603) size? 1. **Solderability:** It is the smallest size that many hobbyists can still comfortably solder by hand using a fine-tip iron or hot air. 2. **Standardization:** It is a "commodity" size, meaning parts are extremely cheap and available from every major manufacturer (Yageo, Murata, Vishay). 3. **Space Efficiency:** It takes up significantly less space than older through-hole components while maintaining reliable electrical characteristics.