The SC4A Turtle Type Tact Switch from ALPS Alpine (or equivalent series) is a compact surface-mount tactile switch designed for reliable user input in embedded and portable electronic devices. Featuring a side press (horizontal actuation) design, it is ideal for applications where vertical space is limited.
Commonly referred to as a “turtle switch” due to its low-profile curved top, this switch provides a crisp tactile feedback and consistent operation. Its 4-pin SMD configuration ensures stable PCB mounting and durability across repeated usage.
Key Features
Electrical Characteristics–
Contact type: Momentary (SPST-NO)
Rated voltage: ~12V DC
Rated current: ~50 mA
Low contact resistance
Mechanical Design-
Actuation type: Side press (horizontal)
Pins: 4 Pin SMD
Low-profile “turtle” design
Compact and space-saving
Performance-
Clear tactile feedback (“click” feel)
Long mechanical life (typically 100,000+ cycles)
Reliable switching performance
Mounting-
Surface Mount Device (SMD)
Strong PCB retention with 4-pin structure
Compatibility-
Works with microcontroller input circuits (STM32, Arduino, etc.)
Suitable for digital input / reset / user interface buttons
Package Information-
Type: Tactile Push Button Switch
Mounting Type: Surface Mount (SMD)
Orientation: Side Press (Horizontal)
Pins: 4
Package Contents-
1 × SC4A Side Press SMD Tact Switch (4-Pin)
Applications-
Reset and boot buttons (STM32 boards)
User input buttons in embedded systems
Flight controllers and RC electronics
Portable and handheld devices
IoT devices and consumer electronics
Usage Note-
Use proper pull-up or pull-down resistor in MCU circuits
Ensure correct orientation in PCB footprint for side actuation
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