## Overview of the E.FL-R-1 Connector The **E.FL-R-1** is a high-frequency, ultra-miniature surface-mount coaxial connector developed by **Hirose Electric**. It is part of the E.FL series, designed specifically for space-constrained electronic devices requiring high-performance RF (Radio Frequency) signal transmission. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Connector Type** | Receptacle (Female) | | **Mounting Style** | Surface Mount (SMT) | | **Impedance** | 50 Ohms | | **Frequency Range** | DC to 3 GHz | | **Mated Height** | 3.0 mm (approx.) | | **V.S.W.R.** | 1.3 Max (at 3 GHz) | | **Contact Plating** | Gold Plating | --- ### Key Electronic Components & Features 1. **Center Contact**: Usually made of Phosphor Bronze with **Gold plating**. This ensures high conductivity and resists oxidation over time, maintaining signal integrity at high frequencies. 2. **Dielectric Material**: High-quality plastic (often LCP - Liquid Crystal Polymer) provides insulation between the center contact and the outer shell, maintaining the constant 50-ohm impedance required for RF circuits. 3. **Outer Shell/Ground**: Acts as a shield against Electromagnetic Interference (EMI) and provides the ground connection to the PCB trace. 4. **Low Profile Design**: With a mated height of roughly 3.0mm, it is significantly smaller than standard SMA or BNC connectors, making it ideal for mobile hardware. --- ### Common Applications The E.FL-R-1 is typically found in hardware where PCB real estate is at a premium and wireless connectivity is required: * **Mobile Phones**: Internal antenna connections. * **Wireless Communication Modules**: Wi-Fi, Bluetooth, and GPS modules. * **IoT Devices**: Small sensors and wearable technology. * **Measurement Equipment**: Internal high-frequency signal routing. --- ### Design Considerations for Engineers * **Footprint**: When designing the PCB, strict adherence to the manufacturer's land pattern is required to ensure impedance matching at the solder pads. * **Mating Cycles**: These connectors are designed for a limited number of mating/unmating cycles (typically around 30-50). They are intended for internal assembly rather than frequent external user access. * **Extraction Tool**: Due to the fragile nature of ultra-miniature connectors, it is highly recommended to use a specific extraction tool to avoid damaging the leads or pulling the receptacle off the board.