The **KLS-A1-2-R** is a specific part number typically associated with **KLS Electronic** components, most commonly identified as a **tactile switch** (or tact switch). These are momentary push-button switches used in low-current circuits to provide a tactile "click" feedback to the user. Below is a breakdown of the technical specifications and electronic characteristics of this part. --- ### 1. General Specifications The KLS-A1-2-R belongs to the standard 6x6mm tactile switch family, which is the most widely used footprint in consumer electronics. | Feature | Specification | | :--- | :--- | | **Type** | Tactile Switch (Momentary) | | **Dimensions** | 6.0 x 6.0 mm (Base) | | **Stem Height** | Determined by the "2" in the suffix (usually 4.3mm or 5mm) | | **Mounting Type** | Through-hole (DIP) | | **Contact Arrangement** | SPST (Single Pole, Single Throw) | | **RoHS Compliant** | Yes (Indicated by "R") | --- ### 2. Electrical Characteristics These parts are designed for signal-level switching rather than power distribution. * **Current Rating:** 50mA * **Voltage Rating:** 12V DC * **Contact Resistance:** ≤ 100mΩ * **Insulation Resistance:** ≥ 100MΩ (100V DC) * **Dielectric Strength:** 250V AC for 1 minute --- ### 3. Mechanical & Physical Properties The "R" in the part number often denotes **RoHS Compliance** or, in some specific KLS catalogs, the **packaging type** (like Radial or Reel), though for standard tactile switches, it almost always signifies environmental compliance. * **Operating Force:** Typically **160gf** (grams-force) or **250gf**. * **Travel:** 0.25mm ± 0.1mm. * **Life Expectancy:** Usually 100,000 cycles (standard) to 1,000,000 cycles (long-life versions). * **Material:** * *Base:* Nylon / PPA * *Cover:* Tin-plated steel or Stainless steel * *Contact:* Silver-plated phosphor bronze --- ### 4. Applications The KLS-A1-2-R is found in various electronic interfaces due to its reliability and small footprint: 1. **Consumer Electronics:** TV remote buttons, microwave panels, and calculators. 2. **Computing:** Reset buttons on motherboards or peripherals. 3. **Industrial:** Control panels and PLC interfaces. 4. **Prototyping:** Extremely popular for use on breadboards and Arduino shields. --- ### 5. Circuit Symbol In a schematic, this part is represented as: ```text / ---/ --- (Switch) ``` *It is "Normally Open" (NO), meaning the circuit is completed only while the button is being held down.*