The **W2TG0-342-R2** is a specific technical identifier typically associated with **Lead-Free (RoHS compliant) Solder Spheres (Solder Balls)**, primarily used in Ball Grid Array (BGA) and Chip Scale Packaging (CSP) semiconductor assembly. These parts are critical in the surface mount technology (SMT) process for creating the electrical interconnects between an integrated circuit (IC) package and a printed circuit board (PCB). --- ### 1. Technical Specifications Below are the general characteristics of the W2TG0-342-R2 series components: | Feature | Specification | |:---|:---| | **Material Composition** | SAC305 (Sn96.5 / Ag3.0 / Cu0.5) | | **Diameter** | 0.342 mm (approx. 13.5 mils) | | **Melting Point** | 217°C – 220°C | | **Compliance** | RoHS / Lead-Free / Green | | **Application** | BGA Reballing, Flip-Chip, CSP | --- ### 2. Composition Breakdown The part belongs to the **SAC305** alloy family, which is the industry standard for lead-free soldering. * **Sn (Tin) - 96.5%**: The base metal providing the structural matrix. * **Ag (Silver) - 3.0%**: Enhances mechanical strength and thermal fatigue resistance. * **Cu (Copper) - 0.5%**: Lowers the melting point and reduces the dissolution of copper from the PCB pads. --- ### 3. Key Electronic Functions The W2TG0-342-R2 serves three primary functions in electronic hardware: 1. **Electrical Interconnect**: It acts as the conductive path for signals and power between the silicon die and the PCB. 2. **Mechanical Support**: Once reflowed, these spheres hold the heavy IC package in place, absorbing stresses caused by thermal expansion. 3. **Thermal Dissipation**: Helps conduct heat away from the processor/chip into the ground planes of the motherboard. --- ### 4. Storage and Handling Because these parts are microscopic and sensitive to oxidation, they require specific handling: * **Environment**: Should be stored in an inert atmosphere (Nitrogen) or sealed containers to prevent oxidation of the tin. * **Usage**: Typically applied using a **stencil** and **tacky flux** before being passed through a reflow oven. ---