12mm LED Tact Switch for PCB Mounting and HMI Applications

The TS-1103GL is a 12mm LED tact switch engineered for human-machine interface (HMI) applications where visual status indication is as critical as tactile feedback. This illuminated tactile switch integrates a high-brightness LED directly into the 12mm x 12mm package, providing clear visual confirmation of switch state — power ON/OFF, function active, or error condition — without requiring a separate indicator LED on the PCB[reference:0].

As a LED tactile push button switch, the TS-1103GL combines the familiar “click” feedback of a momentary tact switch with an integrated LED that illuminates the actuator. The switch uses a 4-pin DIP through-hole configuration — two pins for the switch contacts (SPST-NO) and two pins for the LED — simplifying PCB layout while maintaining mechanical robustness[reference:1]. Rated at 50mA at 12VDC with a contact resistance of ≤100mΩ and insulation resistance ≥100MΩ at 500VDC[reference:2], this 12mm illuminated tact switch delivers reliable performance across 100,000 electrical cycles[reference:3].

The 12mm footprint is an industry-standard size for illuminated tact switches, offering a balance between actuator surface area (comfortable for finger operation) and PCB space efficiency. The DIP through-hole mounting provides superior mechanical anchoring compared to SMT alternatives, making it the preferred choice for applications subject to vibration or repeated actuation[reference:4].

One of the key advantages of the 12mm illuminated tact switch is the ability to choose LED colors that match your product’s design language or indicate specific operational states. The TS-1103GL series is available in four standard single-color options, with dual-color and RGB variants available upon request[reference:24].

For applications requiring more sophisticated visual feedback, dual-color (red/green) and tri-color (red/green/blue — RGB) options are available. These allow a single switch to display multiple states — for example, green for “ready,” yellow for “busy,” and red for “error” — without requiring multiple indicator LEDs[reference:30].

Understanding how an LED tactile push button switch works is essential for proper integration into your PCB design. The TS-1103GL combines two independent electrical functions within a single 12mm package:

The switch and LED circuits are electrically independent — the LED can be illuminated regardless of whether the switch is pressed. This allows the LED to serve as a continuous status indicator (e.g., “power ON”) or to be controlled separately by a microcontroller for dynamic effects like blinking or dimming via PWM[reference:31].

When the button is pressed, the internal metal dome collapses, bridging the two switch contacts and completing the circuit. Upon release, the dome springs back to its original shape, breaking the circuit. The tactile “click” feedback is generated by the dome’s snap action, providing both audible and physical confirmation of actuation[reference:32].

Selecting the right 12mm LED tact switch for your application requires careful consideration of several technical parameters. Here are the seven most important factors to evaluate:

One of the most common questions engineers face is whether to use an illuminated tactile switch or a standard (non-illuminated) version. The decision ultimately comes down to a trade-off between user experience and design complexity[reference:40].

Choose an LED tact switch DIP when:

• User needs visual confirmation of switch state (especially in low-light environments)
• Status indication (power ON, function active, error) is critical for safe operation
• Product aesthetics and UI design call for illuminated controls

Choose a standard tact switch when:

• Power consumption is a primary concern (battery-powered devices)
• Cost is the dominant factor
• The switch is used for internal functions where visual feedback isn’t required

Proper PCB design is essential for reliable operation of your LED tact switch DIP. Here are key recommendations for footprint design, routing, and assembly:

📐 Footprint (Land Pattern)

• Pin Pitch: Standard DIP pitch — typically 5.0mm x 5.0mm or 6.5mm x 4.5mm between the two switch pins[reference:53]
• Hole Diameter: 0.8mm to 1.0mm for through-hole pins (allow 0.2mm clearance)
• Pad Diameter: 1.2mm to 1.5mm for reliable solder joint formation
• Keep-out Area: Maintain 0.5mm clearance around the switch body for automated assembly

🔌 Routing Guidelines

• Switch Pins: Route as standard signal traces — no special impedance requirements
• LED Pins: Pay attention to polarity — the anode (+) and cathode (−) must be correctly identified[reference:54]
• Current-Limiting Resistor: Place a series resistor (typically 220Ω to 1kΩ, depending on LED color and desired brightness) close to the LED anode[reference:55]
• LED Drive: For PWM dimming, connect the LED anode to a microcontroller PWM pin[reference:56]

♨️ Soldering Recommendations

• Wave Soldering: Maximum 260°C for 10 seconds[reference:57]
• Hand Soldering: Under 350°C for 3 seconds maximum[reference:58]
• Flux: Use no-clean or water-soluble flux compatible with the switch materials
• Cleaning: Avoid aggressive solvents that may damage the LED or actuator

Even experienced engineers can make mistakes when integrating an illuminated tactile switch into their design. Here are the seven most common errors and how to avoid them:

Vistar Electronics offers a comprehensive range of tactile switches and illuminated push buttons for diverse applications. Explore our related product lines:

• Tactile Switch Category — Standard and illuminated tact switches in various sizes
• Pushbutton Switch Category — Momentary and latching push button switches
• Electromechanical Switches — DIP switches, slide switches, and more
• DIP Tact Switch — Through-hole tact switches for PCB mounting
• Waterproof Tact Switch — IP-rated sealed switches for harsh environments
• Momentary vs Latching Switch — Understanding the difference
• How to Choose a Tactile Switch — Comprehensive selection guide

• Würth Elektronik WS-TATL THT Illuminated Tact Switches — DigiKey Product Highlight — Industry reference for 12mm illuminated tact switches[reference:73]
• Illuminated vs Standard Tact Switch: A Definitive Guide for Designers and Engineers — Comprehensive comparison and selection guide[reference:74]
• CIT Relay & Switch JS Series Illuminated Tactile Switch — Alternative 12mm illuminated switch reference[reference:75]