The **H.FL-R-SMT** is a high-frequency, ultra-small surface-mount coaxial connector developed by **Hirose Electric**. It is widely used in compact wireless devices for RF (Radio Frequency) signal transmission. --- ### 1. Technical Specifications The H.FL series is known for its low profile and high performance-to-size ratio. | Feature | Specification | | :--- | :--- | | **Connector Type** | Receptacle (Male pin, Female body) | | **Mounting Type** | SMT (Surface Mount Technology) | | **Frequency Range** | DC up to 3 GHz | | **Characteristic Impedance** | 50 Ohms | | **V.S.W.R.** | 1.3 Max (DC to 3 GHz) | | **Mated Height** | 3.0 mm (when used with H.FL plug) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Key Components and Materials The "H.FL-R-SMT" is composed of three primary electronic material zones: 1. **Center Contact:** Usually made of phosphor bronze with **gold plating**. This ensures high conductivity and prevents oxidation at high frequencies. 2. **Insulator:** Made of high-temperature liquid crystal polymer (LCP) or similar resin to withstand reflow soldering temperatures. 3. **Outer Shell/Ground:** Made of silver-plated or gold-plated phosphor bronze to provide excellent EMI (Electromagnetic Interference) shielding. --- ### 3. Applications Due to its small footprint and 50-ohm impedance matching, it is commonly found in: * **Mobile Phones:** Connecting the internal PCB to the antenna. * **Wireless Modules:** Wi-Fi, Bluetooth, and GPS modules. * **IoT Devices:** Compact sensors requiring external antenna connectivity. * **Measuring Instruments:** Compact RF testing boards. --- ### 4. Comparison with Similar Connectors The H.FL is part of a lineage of Hirose connectors. It is slightly larger than the ubiquitous U.FL connector but offers different mechanical stability. | Series | Mated Height | Frequency | | :--- | :--- | :--- | | **U.FL** | 1.9mm - 2.4mm | Up to 6 GHz | | **H.FL** | 3.0mm | Up to 3 GHz | | **W.FL** | 1.4mm | Up to 6 GHz | --- ### 5. Footprint Example (Generic SMT) When designing a PCB for this part, the landing pattern typically looks like this in a CAD environment: ```gcode (Simplified Pad Layout) [ G ] [ S ] [ G ] | | | +------+------+ (Ground Plane) ``` * **S:** Signal Pad (Center pin) * **G:** Ground Pads (Outer shell anchors)