The **ACTF552B/446.0/QCC8C** is a high-performance **Surface Acoustic Wave (SAW) Filter**. These components are critical in radio frequency (RF) design for selecting specific frequencies while rejecting interference. --- ### 1. Technical Specifications Based on the part number nomenclature, here are the primary technical characteristics: | Parameter | Value / Description | | :--- | :--- | | **Center Frequency ($f_c$)** | 446.0 MHz | | **Package Type** | QCC8C (Surface Mount Device) | | **Technology** | SAW (Surface Acoustic Wave) | | **Number of Pins** | 8 Pins | | **Typical Application** | Low-power radio, Telemetry, and Wireless Remote Control | ### 2. Breakdown of the Part Number * **ACTF**: Series prefix, typically indicating a SAW Filter from specific manufacturers like ABRACON or ACT. * **552B**: Specific design iteration or internal product code. * **446.0**: The resonant or center frequency in Megahertz (MHz). This specific frequency is often used in the **PMR446** (Private Mobile Radio) band in Europe. * **QCC8C**: The mechanical package code. It indicates a ceramic, surface-mount package with 8 connection pads. --- ### 3. Key Electronic Functions A SAW filter converts electrical signals into mechanical (acoustic) waves using the piezoelectric effect, filters them through a physical pattern on a crystal substrate, and converts them back to electrical signals. * **Frequency Selection:** It allows the 446.0 MHz signal to pass with minimal loss (**Insertion Loss**) while significantly attenuating signals outside that band. * **Impedance Matching:** The QCC8C package typically requires external components (inductors/capacitors) to match the input/output impedance (usually 50$\Omega$) to ensure maximum power transfer. * **Bandwidth Control:** It provides a specific "window" around 446.0 MHz, ensuring that adjacent channel interference does not disrupt the receiver. --- ### 4. Common Applications 1. **PMR446 Walkie-Talkies:** Filtering for license-free radio communication in the 446 MHz band. 2. **RF Remote Controls:** Used in garage door openers or security systems operating near this frequency. 3. **SRD (Short Range Devices):** Data transmission modules for industrial sensing. --- ### 5. Pinout Configuration (Standard QCC8C) While you should always consult the specific datasheet, the standard 8-pad QCC8C configuration is generally: * **Pin 2:** Input * **Pin 6:** Output * **Pins 1, 3, 4, 5, 7, 8:** Ground (To provide shielding and stability)