The **GSA1.25-R** refers to a high-precision, sub-miniature wire-to-board connector system, most commonly associated with the **1.25mm pitch** standard (similar to Molex PicoBlade or JST-GH series). These parts are engineered for compact electronic assemblies where space is at a premium. --- ## Technical Specifications The following table outlines the typical electrical and mechanical characteristics of the GSA1.25-R series: | Feature | Specification | | :--- | :--- | | **Pitch** | 1.25 mm (0.049") | | **Current Rating** | 1.0A AC/DC | | **Voltage Rating** | 125V AC/DC | | **Contact Resistance** | 20mΩ Max | | **Insulation Resistance** | 100MΩ Min | | **Withstanding Voltage** | 500V AC/minute | | **Operating Temperature** | -25°C to +85°C | | **Material (Housing)** | Nylon 66, UL94V-0 | --- ## Key Components of the System The GSA1.25-R system is composed of three primary electronic parts: ### 1. The Header (PCB Mount) The "R" in the suffix often denotes a **Right-Angle** orientation. * **Mounting:** Surface Mount Technology (SMT) or Through-Hole. * **Pins:** Phosphor bronze with tin or gold plating. * **Design:** Friction lock mechanism to prevent accidental disconnection due to vibration. ### 2. The Housing (Crimp Shell) The female plastic shell that holds the crimped wires. * **Feature:** Polarized design to ensure correct orientation (preventing reverse polarity). * **Locking:** Features a ramp-style friction lock. ### 3. Crimp Terminals The metal contacts that are crimped onto the ends of wires before being inserted into the housing. * **Wire Gauge:** Typically supports 28 AWG to 32 AWG. * **Finish:** Usually pre-tinned for high conductivity and corrosion resistance. --- ## Common Applications Due to its 1.25mm micro-pitch, the GSA1.25-R is found in: * **Drones & Robotics:** Internal sensor and motor wiring. * **Consumer Electronics:** Laptop internal displays, battery connections, and speaker modules. * **Medical Devices:** Compact diagnostic handhelds. * **LED Lighting:** Slim-profile LED strips and controllers. --- ## Coding Example: Pinout Documentation When documenting this part in a project, engineers often use a simple mapping format: ```yaml Connector_ID: J1 Part_Number: GSA1.25-R-04P # 4-pin Right Angle Pinout: 1: VCC (+3.3V) 2: GND 3: DATA_P (I2C SDA) 4: DATA_N (I2C SCL) ```