The **899-3-R220F** is a specific type of **Passive Electronic Component**, specifically a **Resistor Network** (often referred to as a resistor array or SIP - Single In-line Package). These components are designed to reduce board space by housing multiple resistors in a single package. ### 1. Technical Specifications The part number follows a standard coding convention (commonly associated with manufacturers like Bourns or BI Technologies). | Parameter | Value / Specification | | :--- | :--- | | **Package Type** | SIP (Single In-line Package) | | **Circuit Type** | Isolated (Internal independent resistors) | | **Resistance Value** | 220 Ohms | | **Tolerance** | ±1% (denoted by 'F') | | **Number of Pins** | 8-10 Pins (Variable based on series) | | **Power Rating** | Typically 125mW to 250mW per resistor | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps identify the exact function of the chip: * **899**: Represents the series (Standard Molded SIP). * **3**: This is the **Circuit Configuration code**. Code '3' typically means **Isolated Resistors**. In this layout, every two pins represent one independent resistor (no common ground). * **R220**: This is the resistance value. "R" acts as a decimal or indicator, resulting in **220 $\Omega$**. * **F**: This denotes the **Tolerance**. 'F' stands for **±1%**, which indicates a high-precision component. --- ### 3. Internal Schematic & Applications Since this is a "Type 3" (Isolated) network, the internal structure looks like this: ```text Pin 1 --[Resistor]-- Pin 2 Pin 3 --[Resistor]-- Pin 4 Pin 5 --[Resistor]-- Pin 6 Pin 7 --[Resistor]-- Pin 8 ``` #### Common Applications: 1. **Line Termination:** Matching impedance in communication lines to prevent signal reflection. 2. **LED Current Limiting:** Providing consistent resistance for a bank of status LEDs. 3. **Pull-up/Pull-down:** Used in digital logic circuits to ensure pins are at a defined voltage level. 4. **Space Savings:** Replacing 4 or 5 individual discrete resistors with a single component to simplify PCB routing. --- ### 4. Advantages * **Precision:** The 1% tolerance ensures high accuracy for sensitive analog circuits. * **Reliability:** Molded construction protects the resistive elements from moisture and thermal shock. * **Efficiency:** Faster assembly time during the Pick-and-Place process compared to individual resistors.