Based on technical specifications, the **MHO+21TBD-R** is a high-precision **SMD (Surface Mount Device) Crystal Oscillator**. It is typically manufactured by companies like **Jauch Quartz** or similar frequency control component specialists. This part is designed for applications requiring a stable clock signal in a compact form factor. --- ## 1. Technical Specifications The following table highlights the primary electrical and physical characteristics: | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | CMOS Crystal Oscillator | | **Package Size** | 5.0 x 3.2 mm (Standard 4-pad) | | **Operating Voltage** | 3.3V (Common for the +21 series) | | **Frequency Range** | Typically 1.0 MHz to 125.0 MHz | | **Frequency Stability** | ±50 ppm or ±25 ppm (Standard) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Output Load** | 15 pF | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ## 2. Pin Configuration The device usually features 4 pads arranged as follows: 1. **Pad 1: Enable/Disable (E/D) or No Connect.** Used to put the oscillator into standby mode to save power. 2. **Pad 2: Ground (GND).** The common connection for the circuit. 3. **Pad 3: Output (CLK).** The square wave clock signal output. 4. **Pad 4: Supply Voltage (Vdd/Vcc).** Power input (typically 3.3V). --- ## 3. Key Features and Applications The "R" suffix in the part number usually indicates **RoHS Compliance** (Restriction of Hazardous Substances), meaning it is lead-free. ### Common Use Cases: * **Networking:** Used in Ethernet switches and routers. * **Microcontrollers:** Provides the external clock source for MCUs and DSPs. * **Industrial Electronics:** Reliable timing for automation controllers. * **Consumer Electronics:** Standard timing source for high-speed digital circuits. --- ## 4. Part Number Breakdown (Generic) While coding varies by manufacturer, the MHO series generally follows this logic: * **MHO:** Series designation (Metal Hybrid / High Output). * **21:** Package size code (5.0 x 3.2 mm). * **T:** Tri-state function (Enable/Disable pin). * **BD:** Stability and Temperature code. * **R:** RoHS compliant. ---