The **7M5AN-R** is a specific part number typically associated with **Quartz Crystal Units** produced by manufacturers like **TXC Corporation** (7M series). These are surface-mount devices (SMD) used to provide a precise clock frequency for microprocessors and digital circuits. --- ### 1. General Specifications The "7M" series specifically refers to a miniature glass-sealed ceramic package. Below are the common technical attributes: | Feature | Specification | | :--- | :--- | | **Package Size** | 3.2 x 2.5 x 0.7 mm (Standard 3225 SMD) | | **Type** | Glass Sealed Ceramic SMD Crystal | | **Frequency Range** | 10 MHz to 114.285 MHz | | **Load Capacitance** | Typically 8pF, 10pF, 12pF, or 20pF | | **Frequency Tolerance** | ±10 ppm to ±30 ppm (at 25°C) | | **Operating Temp** | -20°C to +70°C (standard) or -40°C to +85°C (industrial) | --- ### 2. Breakdown of the Part Coding While suffixes can vary by specific manufacturer internal logs, the "7M" code generally breaks down as follows: * **7M**: The series identifier for the 3.2 x 2.5 mm form factor. * **5AN**: Often indicates a specific frequency or internal factory configuration (e.g., specific load capacitance and stability). * **-R**: Usually stands for **RoHS Compliant** or **Tape & Reel** packaging. --- ### 3. Key Applications Because of its small footprint and high precision, the 7M5AN-R series is widely used in: * **Wireless Communication**: Bluetooth modules, ZigBee, and Wi-Fi chipsets. * **Consumer Electronics**: Smartwatches, digital cameras, and tablets. * **Computing**: Hard drives, PC peripherals, and USB controllers. * **IoT Devices**: Low-power sensor nodes requiring stable timing. --- ### 4. Typical Circuit Integration In a standard Pierce oscillator circuit, the crystal is connected across the XTAL_IN and XTAL_OUT pins of an IC, accompanied by two load capacitors ($C_1$ and $C_2$). ```cpp // Logic Representation of Crystal Placement [Microcontroller] | (XTAL_IN) ----+---- [ 7M5AN-R ] ----+---- (XTAL_OUT) | | [C1] [C2] | | (GND) (GND) ``` --- ### 5. Benefits of the Glass Seal * **Cost-Effective**: Generally more affordable than seam-sealed versions. * **Hermeticity**: Provides excellent environmental protection for the quartz blank. * **Reliability**: High resistance to thermal shock and mechanical vibration.