The **M2TT-45-R/Q** is a specific variant of a miniature toggle switch produced by **NKK Switches**. It belongs to the **M2 series**, which is known for its process-sealed construction and reliability in PC board applications. ### 1. Technical Specifications The following table highlights the core electrical and mechanical characteristics: | Feature | Specification | | :--- | :--- | | **Circuit Configuration** | DPDT (Double Pole Double Throw) | | **Switch Function** | ON-ON | | **Current Rating** | 0.4VA Max @ 28V AC/DC (Logic Level) | | **Contact Resistance** | 50 milliohms maximum | | **Insulation Resistance** | 1,000 Megohms minimum @ 500V DC | | **Dielectric Strength** | 1,000V AC minimum between contacts | | **Operating Temp Range** | -30°C to +85°C (-22°F to +185°F) | | **Mechanical Life** | 100,000 operations minimum | --- ### 2. Key Design Features * **Process Sealed:** The "Q" suffix or specific M2 designation often indicates a construction that allows for automated soldering and washing. It features an internal O-ring and ultrasonic welding to prevent flux or cleaning agents from entering the switch mechanism. * **Contact Material:** Since it is rated for **0.4VA (Logic Level)**, the contacts are typically **Gold-plated**. Gold prevents oxidation at low voltages where an arc is not strong enough to "clean" the contacts. * **Mounting Type:** Designed for **Through-Hole** mounting on Printed Circuit Boards (PCBs). * **Actuator Style:** Features a standard "Bat" style toggle, typically made of chrome-plated brass or high-strength resin. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying the exact physical attributes: * **M2**: Series identifier (Process Sealed Miniature Toggles). * **T**: Toggle Actuator. * **T**: Brackets/Mounting type (often signifies PC terminals). * **45**: Circuitry and Action (Double Pole, ON-ON). * **R**: Contact Material (Gold for Logic Level). * **Q**: Packaging or specific termination/sealing standard (usually indicates the specific terminal shape or "Qualified" process sealing). --- ### 4. Typical Applications Because of its small footprint and logic-level rating, this part is commonly found in: 1. **Handheld Instruments:** Where space is limited and low power is used. 2. **Telecommunications:** For signal routing or mode selection. 3. **Medical Equipment:** Due to high reliability and environmental sealing. 4. **Control Panels:** Acting as a configuration switch for microprocessors.