Adafruit
Adafruit STEMMA Non-Latching Mini Relay
The Adafruit STEMMA Non-Latching Mini Relay lets you switch lamps, fans, solenoids, and other small appliances (up to 250 VAC/DC) using any 3V or 5V microcon...
The Adafruit STEMMA Non-Latching Mini Relay lets you switch lamps, fans, solenoids, and other small appliances (up to 250 VAC/DC) using any 3V or 5V microcontroller — no soldering, flyback diodes, or level shifting required. Just connect via the JST-PH STEMMA connector and toggle the signal pin high to activate the relay.
The relay features push-in spring terminals for the switched load (24–18 AWG wire) and a red LED indicator when active. It draws approximately 50 mA when the coil is energised and returns to the open (NC) state if power is lost.
Key Features
- Non-Latching Relay – COM connects to NO when signal is high; returns to NC when power is removed
- STEMMA JST-PH Connector – Plug-and-play with 3V or 5V microcontrollers
- Push-In Spring Terminals – Tool-free wire connection for 24–18 AWG
- Red LED Indicator – Lights when relay is active
- Built-In Protection – Flyback diode, level shifting, and pin protection onboard
- Optional Second Switch – Solder pads for a 3-pin terminal block on the side
Switching Capacity
- Up to 2A at 30 VDC or ~40 VAC (resistive load)
- Up to 0.5A at 120 VAC
- Up to 0.6A at 250 VAC
- Up to 0.3A at 110 VDC
- Recommended maximum: 60W for general use
Ideal For
- Switching lamps, fans, and small appliances
- Solenoid and valve control
- Home automation projects
- Circuit Playground and micro:bit projects (with alligator clip cable)
Package Contents
- 1× STEMMA Non-Latching Mini Relay board (assembled and tested)
Jargon buster
Plain-language definitions for the technical terms used above.
- alligator clip
- An alligator clip is a spring-loaded metal clip used to make temporary electrical connections to wires, terminals or test points. It is useful for quick bench testing, but it is less secure than a screw terminal or locking connector.
- AWG
- American Wire Gauge is a numbering system for wire thickness, where a lower number means a thicker wire. The AWG rating matters because thicker wire can usually carry more current with less voltage drop and heating.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale where 7 is neutral. For a water monitoring kit, pH tells you about water chemistry and whether the included probe matches the range and accuracy your project needs.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- Terminal block
- A connector used to join wires together in a neat, removable, or serviceable way. For this product, it helps split one power input into several outputs without soldering.
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Related Tutorials
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