The **W2SP-2AA-R/U** is a specialized electronic component, specifically a **dual-stack battery holder** designed for printed circuit board (PCB) mounting. It is manufactured by **MPD (Memory Protection Devices)**. ### 1. Component Overview This part is engineered to hold two (2) AA batteries in a series configuration. The suffix "R/U" typically refers to the terminal style (usually PC pins) and compliance certifications (like UL). --- ### 2. Technical Specifications | Feature | Specification | | :--- | :--- | | **Battery Size** | AA (LR6, R6) | | **Number of Cells** | 2 | | **Configuration** | Dual Stacked (Vertical or side-by-side arrangement) | | **Mounting Type** | PCB Through-Hole (PC Pins) | | **Housing Material** | Polypropylene (UL94-HB or UL94-V0) | | **Contact Material** | Nickel-plated Spring Steel | | **Output Voltage** | 3.0V (Standard series connection) | --- ### 3. Key Physical Features * **Terminals:** The unit features sharp solder pins that protrude from the bottom, allowing it to be soldered directly into a PCB. * **Dual-Stack Design:** Unlike flat holders, the "SP" (Stackable/Space) series is often designed to minimize the PCB footprint by optimizing how the batteries are seated. * **Springs:** High-tension nickel-plated springs ensure a low-resistance electrical connection and hold the cells securely against vibration. --- ### 4. Application and Use Cases * **Consumer Electronics:** Handheld devices, remote controls, and toys. * **Industrial Backups:** Providing 3V power for CMOS memory or Real-Time Clocks (RTC) during power outages. * **IoT Devices:** Powering wireless sensors that require a compact but long-lasting energy source. --- ### 5. Installation Note When designing a PCB for the **W2SP-2AA-R/U**, ensure the drill hole diameters match the pin thickness (usually around 1.0mm) and that the polarity markings on the PCB match the holder to prevent reverse-polarity damage to the circuit.