The **MA73FAX-R** is a specific electronic component typically categorized as a **Surface Mount Device (SMD) Quartz Crystal Unit**. It is widely used in telecommunications, consumer electronics, and industrial timing circuits. Below is a detailed breakdown of its specifications, construction, and applications. --- ### 1. Technical Specifications The "MA-73" series is manufactured by companies like **Seiko Epson** or **Raltron**. While specific frequencies vary based on the full part number suffix, the core technical profile is as follows: | Parameter | Typical Value | | :--- | :--- | | **Component Type** | Quartz Crystal (Resonator) | | **Frequency Range** | Typically 3.5 MHz to 30 MHz | | **Package Type** | Metal Can / SMD (Surface Mount) | | **Frequency Tolerance** | ±30 ppm to ±50 ppm | | **Operating Temperature** | -20°C to +70°C (Standard) | | **Load Capacitance** | 10pF to 20pF (Variable) | | **Mounting Style** | SMD / SMT | --- ### 2. Physical Characteristics The "MA" designation often refers to a specific package style known as a "Molded" or "Plastic" surface mount package with a metal crystal unit inside. * **Shape:** Rectangular body with J-lead or Gull-wing terminals. * **Durability:** The molded plastic casing provides excellent protection against humidity and mechanical shock. * **Dimensions:** Common sizes for the 73 series are approximately **13.46mm x 5.08mm**. --- ### 3. Part Number Decoding (Typical) * **MA:** Molded Crystal series. * **73:** Dimensional code (Standard 13.4 x 5.0 mm footprint). * **FAX:** Often denotes frequency stability and temperature range parameters. * **-R:** Generally indicates **RoHS Compliance** (Lead-free) or **Reel** packaging for automated pick-and-place machines. --- ### 4. Key Applications Because of its stability and surface-mount design, the MA73FAX-R is found in: * **Microcontrollers:** Providing the clock signal for CPUs. * **Wireless Modules:** Bluetooth or Zigbee timing requirements. * **Modems/Routers:** Handling data transmission timing. * **Automotive Electronics:** Used in non-safety critical infotainment systems. --- ### 5. Circuit Implementation To use this part, it is typically connected across the `OSC_IN` and `OSC_OUT` pins of an IC, accompanied by two load capacitors ($C_1$ and $C_2$) connected to ground. ```c // Typical Schematic Representation [IC OSC_IN] ----+---- [Crystal] ----+---- [IC OSC_OUT] | | (Cap 1) (Cap 2) | | [GND] [GND] ```