The **RL1011-121-R** is a specific model of a **Fixed Radial Inductor** manufactured by **Bourns Inc.** This component is part of the RL1011 series, designed for general-purpose applications where space and high-saturation current are critical factors. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's characteristics: | Code | Meaning | Description | | :--- | :--- | :--- | | **RL1011** | Series Name | Radial leaded inductor, 10mm diameter x 11mm height | | **121** | Inductance Code | 120 µH (12 followed by 1 zero) | | **K** | Tolerance | Typically ±10% (Implicit in series standard) | | **-R** | Compliance | RoHS Compliant | --- ### 2. Key Technical Specifications The RL1011-121-R is characterized by its physical size and electrical performance: * **Inductance:** 120 µH * **Tolerance:** ±10% * **Current Rating (I-dc):** Approximately 1.1A to 1.3A (varies slightly by specific revision). * **DC Resistance (DCR):** Low resistance (approx. 0.20 - 0.25 Ω max) to minimize power loss. * **Self-Resonant Frequency (SRF):** High frequency stability (approx. 3.5 MHz). * **Operating Temperature:** -20°C to +105°C. --- ### 3. Construction and Form Factor This part is a **through-hole** component with the following physical attributes: * **Core Material:** Ferrite core (Ni-Zn) for efficient magnetic flux. * **Coating:** Enclosed in a flame-retardant polyolefin shrink tube for protection and insulation. * **Leads:** Pre-tinned copper wires for easy soldering. * **Size:** Diameter of ~10mm and a height of ~11mm, with a lead spacing of 5.0mm. --- ### 4. Typical Applications Because of its high saturation current and reliability, this inductor is commonly used in: 1. **Power Supplies:** Filtering input/output noise in DC-DC converters. 2. **EMI/RFI Filtering:** Reducing electromagnetic interference in consumer electronics. 3. **Energy Storage:** Used in switching regulators. 4. **Signal Processing:** Decoupling and choke applications in telecommunications. ---