Adafruit
Adafruit STEMMA Audio Amp - Mono 2.5W Class D - PAM8302
The Adafruit STEMMA Audio Amp is a compact mono Class D amplifier based on the PAM8302 chip, delivering up to 2.5W into 4 Ω speakers from a 2.0–5.5V DC suppl...
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The Adafruit STEMMA Audio Amp is a compact mono Class D amplifier based on the PAM8302 chip, delivering up to 2.5W into 4 Ω speakers from a 2.0–5.5V DC supply. With over 90% efficiency at half a watt into 8 Ω, it's ideal for portable and battery-powered audio projects.
This plug-and-play STEMMA version requires no soldering — audio input connects via a JST-PH 3-pin connector. The output is bridge-tied and drives speakers directly through a filterless design with ferrite bead and capacitor filtering. A built-in trim pot lets you adjust volume down from the default 24 dB gain.
Key Features
- PAM8302 Class D Amplifier – 2.5W at 4 Ω or 1.5W at 8 Ω (10% THD, 5.5V supply)
- Wide Voltage Range – 2.0–5.5V DC operation
- High Efficiency – Over 90% at 0.5W into 8 Ω
- Volume Trim Pot – Adjustable from default 24 dB gain
- Thermal + Overcurrent Protection – Built-in safety features
- Low Quiescent Current – 4 mA active, 0.5 mA shutdown
- 50 dB PSRR – At 1 kHz for clean audio
- JST-PH Audio Input – No-solder STEMMA connection (ground-referenced, not differential)
- Filterless Design – Ferrite bead + capacitors on output
Ideal For
- Battery-powered audio projects
- Portable speakers and sound effects
- Interactive exhibits and installations
- Wearable audio devices
Package Contents
- 1× STEMMA Audio Amp breakout board (PAM8302)
- 1× Header strip
- 1× 3.5 mm screw terminal block for speaker connection
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- 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.
- Impedance
- Impedance is the total opposition a component or circuit presents to alternating current, measured in ohms, combining resistance with frequency-dependent reactance. It appears in many contexts, such as matching a speaker's impedance (for example 4 ohm or 8 ohm) to an amplifier or the input and output impedance of signal circuits, and a correct match helps avoid weak signals, distortion or damage.
- 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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