The part number **898-5-R220F** typically refers to a **Thick Film Resistor Network** manufactured by BI Technologies (now a brand of TT Electronics). These components are designed to package multiple resistors into a single unit to save space on a Printed Circuit Board (PCB). --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the specific characteristics of the component: | Segment | Meaning | Description | | :--- | :--- | :--- | | **898** | Model Series | Standard Dual-In-Line Package (DIP) series. | | **-5** | Circuit Type | Indicates a "Dual Terminator" or "Pulse Squashing" configuration. | | **-R** | Resistor Code | Standard prefix for resistance values. | | **220** | Resistance Value | 22 ohms (First two digits are significant; the third is the multiplier). | | **F** | Tolerance | Indicates a ±1% precision tolerance. | --- ### 2. Technical Specifications The 898 series is known for its reliability and thermal stability. Below are the typical technical parameters for this specific part: * **Package Type:** 14-pin or 16-pin DIP (Dual-In-Line Package). * **Resistor Material:** Thick Film Cermet. * **Operating Temperature:** -55°C to +125°C. * **Power Rating:** Usually 0.125W to 0.25W per resistor at 70°C. * **Voltage Rating:** Max 100V (typical for the 898 series). --- ### 3. The "-5" Circuit Configuration The "5" in the part number is critical as it defines how the resistors are connected internally. In a **Dual Terminator** (Circuit 5) setup: * The pins are connected to two different bus lines (usually $V_{cc}$ and Ground). * Each output pin is connected to two resistors: one going to the supply and one going to the ground. * This is primarily used for **impedance matching** and **line termination** in high-speed digital circuits (like TTL or ECL logic) to prevent signal reflections. --- ### 4. Applications The 898-5-R220F is commonly found in the following environments: 1. **Digital Communication:** Termination for SCSI or data bus lines. 2. **Computing:** Pull-up/Pull-down resistor arrays for address lines. 3. **Industrial Controls:** Reducing noise and managing signal integrity in long-wire transmissions. 4. **Legacy Systems:** Maintenance of older motherboards and interface cards. ---