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...
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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.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- 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 terminal block is a connector that joins wires together in a neat, removable, or serviceable way, usually clamping each wire under a screw or spring instead of soldering. It makes it easier to connect, change, or service wiring without permanent joints.
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