### G3T28AH-R: Electronic Component Overview The **G3T28AH-R** is a high-quality, subminiature toggle switch manufactured by **NKK Switches**. It is specifically designed for logic-level applications and is widely used in high-density printed circuit board (PCB) layouts. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Switch Function** | DPDT (Double Pole Double Throw) | | **Switch Operation** | (ON) - OFF - (ON) *Note: Parentheses indicate momentary action* | | **Current/Voltage Rating** | 0.4VA maximum @ 28V AC/DC (Logic Level) | | **Termination Style** | Right Angle PC Terminals | | **Mounting Type** | Through-Hole, Horizontal Mount | | **Mechanical Life** | 50,000 Operations minimum | | **Contact Resistance** | 80 milliohms maximum | --- ### 2. Functional Characteristics * **Momentary Action:** The "G3T28" series with the specific "AH" configuration usually operates as a momentary switch. This means the lever returns to the center "OFF" position automatically after being released from either "ON" position. * **Logic Level Only:** This part is designed for low-power signal switching. It uses gold-plated contacts to ensure reliability when switching very low currents (dry circuits) where silver contacts might oxidize and fail. * **Sealed Construction:** The device features an ultra-sonic welded housing and an internal O-ring. This makes the switch **washable**, allowing it to survive automated soldering and cleaning processes without contamination. --- ### 3. Physical & Material Properties * **Ultra-Miniature Size:** Its small footprint allows for high-density mounting on PCBs, saving significant board space. * **Heat Resistant Resin:** The base and cover are made of high-temperature polyphenylene sulfide (PPS), which withstands vapor phase and infrared convection reflow soldering. * **Contact Material:** Phosphor bronze with gold plating over nickel. --- ### 4. Part Number Breakdown (NKK Nomenclature) | Code | Meaning | | :--- | :--- | | **G3T** | Series Name (Subminiature Antistatic Toggle) | | **28** | Circuit: DPDT (Double Pole, Double Throw) | | **A** | Actuator: Toggle Lever | | **H** | Terminals: Right Angle (Horizontal) | | **-R** | Packaging: RoHS Compliant / Tape & Reel (or specific revision) | ---