The **MXAB-S2V1-R3/Q** is a specific model identifier for a **Low-Profile Key Switch**, commonly referred to as the **Cherry MX Low Profile Red** switch. These components are designed for mechanical keyboards where a slimmer form factor is required without sacrificing the linear typing experience. --- ### 1. Technical Specifications The "S2V1" designation typically refers to the specific generation and revision of the switch housing and internal leaf spring design. | Parameter | Specification | | :--- | :--- | | **Switch Type** | Linear (Smooth, no tactile bump) | | **Actuation Force** | 45 cN (approx. 45g) | | **Pre-travel** | 1.2 mm | | **Total Travel** | 3.2 mm | | **Durability** | > 100 Million actuations | | **Lighting Support** | Transparent housing (optimized for SMD LEDs) | --- ### 2. Electronic & Structural Components The switch functions as a simple mechanical SPST (Single Pole Single Throw) momentary contact switch. * **Gold Crosspoint Contacts:** The internal contacts are plated with high-purity gold. This ensures corrosion resistance and reliable electrical signals even at very low voltages (essential for digital logic circuits). * **SMD LED Compatibility:** The base of the housing features a cutout or "lens" area designed to allow light from Surface Mount Device (SMD) LEDs on the PCB to shine through the switch body. * **Pin Configuration:** This is typically a **3-pin (Plate Mount)** design, consisting of two metal electrical contact pins and a central plastic alignment pillar. * **The Spring:** A precision-coiled stainless steel spring determines the "return force" and the 45cN actuation weight. --- ### 3. Key Differences (Low Profile vs. Standard) The **R3/Q** revision reflects modern improvements in the manufacturing process for better stability and "stem wobble" reduction. 1. **Reduced Height:** Total height is approximately 11.9 mm, compared to the 18.5 mm of a standard MX switch. 2. **Actuation Speed:** Because the pre-travel is only 1.2 mm (vs. 2.0 mm), the electronic circuit closes faster, making it a popular choice for gaming. 3. **Stem Design:** Uses a circular perimeter around the cross-mount to improve dust resistance and stabilize the keycap. --- ### 4. Implementation Requirements * **PCB Compatibility:** These switches require a specific PCB layout. They are **not** pin-compatible with standard Cherry MX footprints due to the different pin positioning and lower height. * **Soldering:** Most "R3/Q" variants are designed for wave soldering or manual soldering onto high-density circuit boards.