The part number **EMPCB.SMAFSTJ.B.HT** refers to a specialized RF (Radio Frequency) coaxial connector component, typically designed for high-temperature Surface Mount Technology (SMT) applications on Printed Circuit Boards (PCBs). ### Component Breakdown The nomenclature can be deconstructed into the following technical specifications: | Segment | Meaning | Technical Description | | :--- | :--- | :--- | | **EMPCB** | **Edge Mount PCB** | Indicates the physical mounting style; designed to slide onto the edge of a PCB. | | **SMA** | **SubMiniature version A** | The interface type. A standard semi-precision RF connector with a 50-ohm impedance. | | **F** | **Female** | Specifies the gender of the connector (Jack). | | **ST** | **Straight** | Refers to the orientation of the connector body relative to the PCB. | | **J** | **Jack** | Receptacle style (as opposed to a Plug/Male). | | **B** | **Bulkhead / Brass** | Usually indicates the material composition or a specific mounting hardware feature. | | **HT** | **High Temperature** | Rated for high-temperature environments or lead-free reflow soldering processes. | --- ### Technical Specifications This component is engineered for precision signal integrity in wireless communication and testing equipment. * **Impedance:** 50 Ohms (Standard for RF). * **Frequency Range:** Typically DC to 18 GHz (depending on the specific manufacturer's tolerances). * **Mounting Type:** SMT Edge Mount. This minimizes signal loss and reflections by providing a direct horizontal transition from the connector to the PCB trace. * **Material:** Gold-plated brass or stainless steel body with a PTFE (Teflon) insulator. * **Temperature Rating:** "HT" versions are often rated up to +165°C or higher to withstand rigorous industrial environments. --- ### Typical Applications 1. **Telecommunications:** Base stations and cellular backhaul equipment. 2. **Test & Measurement:** High-speed digital characterization boards. 3. **Aerospace:** High-reliability communication modules where heat resistance is critical. 4. **Wireless IoT:** Gateway devices requiring external antenna connections via a PCB edge. --- ### Comparison: Standard vs. Edge Mount | Feature | Standard SMT SMA | Edge Mount (EMPCB) | | :--- | :--- | :--- | | **PCB Real Estate** | Occupies top surface area. | Occupies the edge; saves surface space. | | **Signal Path** | Requires a 90-degree turn (Vias). | Direct horizontal launch (Lower VSWR). | | **Mechanical Stress** | High stress on solder pads. | Mechanical support provided by the PCB thickness. |