Adafruit
STEMMA Analog SPDT Switch - MAX4544, 12V, JST PH 2mm
· MPN: ADA5892
This breakout makes it much easier to use the tiny MAX4544 SPDT analogue switch in prototypes and one-off builds. It gives you a solid-state alternative to a...
This breakout makes it much easier to use the tiny MAX4544 SPDT analogue switch in prototypes and one-off builds. It gives you a solid-state alternative to a relay for switching between two analogue signal paths, with a compact board and a plug-and-play STEMMA JST PH input so you can get started without fiddly surface-mount soldering.
The switch behaviour is straightforward: when the selection signal is low, the Common pin connects to the Normally Closed (NC) pin and disconnects from the Normally Open (NO) pin. When the selection signal is high, Common connects to NO and disconnects from NC. Because it is an analogue switch rather than a mechanical relay, it does not wear out mechanically, switches in about 30nS, and the MAX4544 provides break-before-make operation so the NC and NO pins will not accidentally cross-connect.
For connections, the board includes a JST PH (2mm pitch) input connector for power and control, plus an output terminal block for the Common, Normally Open and Normally Closed signals. You can also access the signal and power pins on a 0.1" breakout header. Keep in mind that this board is intended for signal routing rather than power switching: V+ must be at least as high as the highest analogue voltage you want to switch, negative voltages cannot be applied to the COM/NO/NC pins, and it is not suitable for sourcing or sinking more than a few mA.
Specifications:
- Switch IC: MAX4544 SPDT analog switch
- Switched signal voltage: up to 12V
- Switch time: about 30nS
- Break-before-make: guaranteed
- V+ power: from 3V up to 12V
- Logic level input: at least 2.5VDC
- Input connector: JST PH (2mm pitch)
- Output connection: terminal block with the common, Normally Open and Normally Closed signals
- Breakout header: 0.1" breakout header
- Signal limitation: No negative voltages can be applied to the COM/NO/NC pins
- Current limitation: not good for providing more than a few mA of current
- Product Dimensions: 25.3mm x 17.8mm x 10.1mm / 1.0" x 0.7" x 0.4"
- Product Weight: 2.7g / 0.1oz
A handy option for routing analogue signals in breadboard-friendly builds, test setups, and other projects where you want fast switching without relay wear or relay coil power draw.
Jargon buster
Plain-language definitions for the technical terms used above.
- 2mm pitch
- Pitch is the distance between the centres of neighbouring pins on a connector. A 2mm pitch header is smaller than the common 2.54mm breadboard spacing, so you need matching cables and headers rather than standard breadboard jumper leads.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- JST PH
- A small keyed plug-and-socket connector with 2 mm pin spacing, often used for low-power electronics connections. You need the correct JST PH cable, and its current rating limits how much power should be passed through it.
- 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.
MAX4544 Datasheet
Datasheet · 246.3 KB · Click any page to view full size
