The **G3T28AB-R** is a high-quality electronic component primarily classified as a **Process Sealed Ultra-Miniature Toggle Switch**, manufactured by **NKK Switches**. It is designed for logic-level applications where space is limited and environmental protection is required. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer** | NKK Switches | | **Circuit** | DPDT (Double Pole Double Throw) | | **Switch Function** | ON-OFF-(ON) / Momentary | | **Contact Rating** | 0.4VA Max @ 28V AC/DC Max (Logic Level) | | **Mounting Type** | Surface Mount (SMD/SMT) - Right Angle | | **Actuator Style** | Standard Toggle (3.8mm) | | **Terminal Type** | Gull Wing | | **Operating Temp** | -30°C to +85°C | --- ### 2. Functional Breakdown #### Circuit Configuration: DPDT The "Double Pole Double Throw" configuration means this switch can control two separate circuits simultaneously. It has two positions: one maintained (ON) and one momentary (bracketed ON), returning to the center or neutral position when released. #### Contact Material: Gold (Code: B) The "B" in the part number signifies **Gold-plated contacts**. Gold is used specifically for "Logic Level" applications because it prevents oxidation and ensures high reliability when switching very low currents and voltages (0.4VA max). #### Environmental Sealing The G3T series features a **process-sealed construction**. The housing is ultrasonically welded, and the terminals are epoxy-sealed. This allows the switch to undergo automated soldering and high-pressure washing processes without internal contamination. --- ### 3. Physical Dimensions & Layout * **Ultra-Miniature Size:** Designed to consume minimal PCB real estate. * **Right Angle Orientation:** The actuator toggles parallel to the PC board, which is ideal for side-access panels on handheld devices. * **Heat Resistance:** The high-temperature resin body allows the part to withstand infrared (IR) reflow soldering. --- ### 4. Applications Due to its small footprint and reliability, the G3T28AB-R is commonly found in: 1. **Handheld Instruments:** For mode selection or power. 2. **Telecommunications:** Signal switching in compact routing gear. 3. **Medical Electronics:** Where precision and chemical resistance (due to sealing) are needed. 4. **Audio/Visual:** Input toggles for portable recording devices.