The **WJM-1B4-R** is a specific electronic component, typically categorized as a **Micro-USB Connector** or a **USB Interface Module** used primarily in consumer electronics and PCB assemblies. Below is a detailed breakdown of its technical characteristics and internal parts. ### 1. General Specifications The WJM-1B4-R is designed as a surface-mount or through-hole hybrid connector. It serves as the physical interface for power delivery and data transfer. | Feature | Specification | | :--- | :--- | | **Interface Type** | Micro-USB (Type B) | | **Orientation** | Right Angle / Horizontal | | **Mounting Type** | SMT (Surface Mount) + Through-hole shell tabs | | **Pin Count** | 5 Pins (VCC, D-, D+, ID, GND) | | **Standard** | USB 2.0 | --- ### 2. Internal Electronic Components & Materials The part is composed of several distinct materials designed for conductivity and durability: * **Contacts (Pins):** Usually made of **Copper Alloy**. These are gold-plated on the contact area to prevent oxidation and ensure low electrical resistance. * **Insulator (Housing):** High-temperature thermoplastic (LCP - Liquid Crystal Polymer). This allows the part to survive the heat of reflow soldering. * **Outer Shell (Shield):** Stainless steel or brass with nickel plating. This provides mechanical strength and EMI (Electromagnetic Interference) shielding. * **Solder Tabs:** These are the structural wings of the shell that provide "strain relief," preventing the connector from being ripped off the PCB during cable insertion. --- ### 3. Pinout Configuration The 5-pin layout follows the standard Micro-USB wiring: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | VBUS | +5V Power Supply | | **2** | D- | Data Minus | | **3** | D+ | Data Plus | | **4** | ID | OTG Identification (Host/Slave) | | **5** | GND | Ground | --- ### 4. Technical Electrical Ratings | Parameter | Rating | | :--- | :--- | | **Current Rating** | ~1.0A to 1.8A (Pin 1 & 5) | | **Voltage Rating** | 30V AC/DC | | **Contact Resistance** | < 30mΩ | | **Insulation Resistance** | > 100MΩ | | **Durability** | ~10,000 Mating Cycles | --- ### 5. Application Code Example When integrating this part into a circuit (e.g., an Arduino or ESP32 project), the wiring logic in a schematic tool would look like this: ```cpp // Logic for Pin 4 (ID Pin) usage if (ID_Pin == LOW) { // Device acts as USB Host } else { // Device acts as Peripheral/Slave } ``` ---