The **FTS-55-R** is a specific electronic component typically categorized as a **Surface Mount (SMT) Low-Pass Filter** or a **Terminal Strip/Connector**, depending on the manufacturer (most commonly associated with **Mini-Circuits** for RF filters or **Samtec** for interconnects). Given the common industry usage, here is the breakdown of the electronic characteristics for the **Mini-Circuits FTS-55-R** (RF Low Pass Filter). --- ## 1. Core Specifications This component is designed to allow signals below a certain "cutoff" frequency to pass while attenuating (blocking) higher frequencies. | Parameter | Specification | | :--- | :--- | | **Component Type** | Low Pass Filter (LPF) | | **Passband Frequency** | DC to 55 MHz | | **Stopband (20dB Rejection)** | 73 MHz to 93 MHz | | **Stopband (40dB Rejection)** | 93 MHz to 250 MHz | | **Insertion Loss** | < 1.0 dB (in passband) | | **VSWR** | 1.7:1 (Typical) | | **Impedance** | 50 Ohms | --- ## 2. Electrical Behavior The FTS-55-R functions as a passive network of inductors and capacitors (LC circuit) configured to filter signal noise. * **Cutoff Frequency ($f_c$):** At 55 MHz, the signal begins to experience significant attenuation. * **Rejection:** It provides steep attenuation (above 40dB) for high-frequency interference, making it ideal for cleaning up signals after a frequency mixer or power amplifier. * **Power Handling:** Generally rated for low power (approx. 0.5W to 1W), primarily used in signal chains rather than power stages. --- ## 3. Physical & Mechanical Properties The "-R" suffix usually denotes **RoHS Compliance** (Restriction of Hazardous Substances), meaning the part is lead-free. ### Package Styles * **Mounting:** Surface Mount Technology (SMT). * **Case Style:** Often the **N82** or similar shielded metal case to prevent EMI (Electromagnetic Interference) leakage. * **Terminations:** Solder plated for reflow processes. ### Pinout Configuration (Standard N82 Case) | Pin Number | Function | | :--- | :--- | | 1 | Input | | 8 | Output | | 2, 3, 4, 5, 6, 7 | Case Ground | --- ## 4. Typical Applications * **Harmonic Suppression:** Removing unwanted harmonics from local oscillators. * **Receiver Front-ends:** Blocking high-frequency interference from entering the sensitive IF (Intermediate Frequency) stages. * **Test Equipment:** Ensuring clean signal generation in lab environments. ---