The **AC20-R12K-RC** is an electronic component manufactured by **Bourns**. It belongs to the **AC Series** of air-core inductors (often referred to as RF chokes or air coils). These parts are primarily used in high-frequency applications where low loss and high stability are required. ### 1. Part Number Breakdown Understanding the nomenclature helps identify the specific characteristics of the component: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **AC** | Series Name | Air Core Inductor | | **20** | Size Code | Physical dimensions (Approx. 4.6mm x 3.5mm) | | **R12** | Inductance Value | **0.12 µH** (120 nH) | | **K** | Tolerance | **±10%** | | **RC** | Compliance | RoHS Compliant | --- ### 2. Technical Specifications The AC20-R12K-RC is designed for high-frequency performance. Below are the typical electrical parameters for this specific value: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.12 µH (120 nH) | | **Tolerance** | ±10% | | **Q Factor (Min)** | 50 (at 150 MHz) | | **SRF (Self Resonant Frequency)** | ~1100 MHz (1.1 GHz) | | **DCR (DC Resistance) Max** | 0.015 Ohms | | **Rated DC Current (Idc)** | 3.0 Amps | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Features and Construction * **Air Core Design:** Because there is no magnetic core (like ferrite or iron powder), this inductor is free from "core losses" and magnetic saturation. This makes it ideal for high-current applications and circuits requiring high linearity. * **High Q Factor:** Offers low dissipation, which is critical for maintaining signal integrity in RF circuits. * **Surface Mount (SMD):** The "AC" series is designed for automated pick-and-place assembly on PCBs. * **Stability:** Excellent temperature stability compared to ferrite-core counterparts. --- ### 4. Common Applications Due to its high frequency and high current capabilities, this part is typically found in: 1. **RF Amplifiers:** Used for impedance matching and biasing. 2. **Filters:** Band-pass or low-pass filters in telecommunications. 3. **Power Supplies:** High-frequency switching regulators where low inductance and high current are needed. 4. **Wireless Devices:** Handheld radios, Wi-Fi modules, and GPS receivers. ---