The **KAC-AA5-R** is a specific electronic component, typically categorized as a **Surface Mount Device (SMD) Tactile Switch**. These components are widely used in consumer electronics, automotive controls, and industrial interfaces to provide physical feedback to a user. Below is a detailed breakdown of its electronic characteristics and specifications. --- ## 1. Component Overview The KAC series (specifically the AA5-R variant) is designed for side-actuation. Unlike traditional top-push buttons, this switch is triggered from the side, making it ideal for the edges of PCBs (e.g., volume buttons on a smartphone or power buttons on a tablet). ### Key Specifications | Parameter | Value / Description | | :--- | :--- | | **Type** | Tactile Switch (Momentary) | | **Orientation** | Right Angle / Side Actuated | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Contact Rating** | 50mA @ 12V DC (Typical) | | **Operating Force** | 160gf to 220gf (depending on specific batch) | | **Life Cycle** | ~100,000 to 200,000 cycles | | **Travel** | 0.25mm ± 0.1mm | --- ## 2. Structural Design The "AA5" designation often refers to the physical dimensions and the specific height/width profile of the switch body. ### Physical Features: * **Actuator:** Usually made of high-temperature plastic (LCP or Nylon). * **Base:** Heat-resistant resin to withstand reflow soldering temperatures. * **Terminals:** Silver-plated or Gold-plated copper alloy for high conductivity and oxidation resistance. * **Grounding:** Many "R" (Right angle) variants include a metal "boss" or grounding bracket to provide mechanical stability against the force of a finger press. --- ## 3. Circuit Configuration Most tactile switches in this category follow a **SPST-NO** (Single Pole Single Throw - Normally Open) configuration. ```mermaid graph LR A[Terminal 1] ---|Gap| B[Terminal 2] Note[Pressing the button closes the gap] ``` --- ## 4. Application Use Cases Because of its small footprint and right-angle orientation, the KAC-AA5-R is commonly found in: 1. **Handheld Devices:** Power and Volume rockers. 2. **Wearables:** Smartwatches and fitness trackers. 3. **Automotive:** Steering wheel controls or dashboard toggles. 4. **Peripheral Hardware:** Reset buttons on routers or modems. --- ## 5. Soldering and Manufacturing As an SMT component, it is designed for **Reflow Soldering**. * **Packaging:** Usually supplied in **Tape & Reel** (the "R" suffix often indicates Reel packaging) for automated pick-and-place machines. * **Heat Resistance:** Designed to withstand peak temperatures of approximately **260°C** for 10 seconds.