# Adafruit PAM8302 - Mono 2.5W Class D Audio Amplifier
## Overview
This super small mono amplifier is surprisingly powerful - able to deliver up to 2.5 Watts into 4-8 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.0V-5.5VDC. Since the amp is a class D, its very efficient (over 90% efficient when driving an 8Ω speaker at over half a Watt) - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell it got hot. There's even a volume trim pot so you can adjust the volume on the board down from the default 24dB gain. This board is a welcome upgrade to basic "LM386" amps!
The A+ and A- inputs of the amplifier go through 1.0uF capacitors, so they are fully 'differential' - if you don't have differential outputs, simply tie the Audio- pin to ground. The output is "Bridge Tied" - that means the output pins connect directly to the speaker pins, no connection to ground. The output is a high frequency 250KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard. All the above means that you can't connect the output into another amplifier, it should drive the speakers directly.
Comes with a fully assembled and tested breakout board. We also include header to plug it into a breadboard and a 3.5mm screw-terminal blocks so you can easily attach/detach your speaker. You will be ready to rock in 15 minutes! **Speaker is not included, use any 4 ohm or greater impedance speaker.**
- Output Power: 2.5W at 4Ω, 10% THD, 1.5W at 8Ω, 10% THD, with 5.5V Supply
- 50dB PSRR at 1KHz
- Filterless design, with ferrite bead + capacitors on output.
- Fixed 24dB gain, onboard trim potentiometer for adjusting input volume.
- Thermal and short-circuit/over-current protection
- Low current draw: 4mA quiescent and 0.5mA in shutdown (due to pullup resistor on SD pin)
**Note:** The terminal block included with your product may be blue or black.
# Adafruit PAM8302 - Mono 2.5W Class D Audio Amplifier
## Pinouts
Info: This board is an audio amplifier and as a result, does not require code to work. It accepts an audio signal and outputs it to a speaker.
## Power Pins
- **VIN** - This is the power pin. To power the board, give it 2.0V-5.5VDC.
- **GND** - This is common ground for power.
## Input Pins
- **A+** and **A-** - Audio inputs for the amplifier. Signal goes through 1.0uF capacitors, so they are fully 'differential'. If you don't have differential outputs, simply tie the **A-** to ground.
## Shutdown Pin
- **SD** - The shutdown pin. Can be used to power down the amplifier by tying to ground.
## Output Pins
- **+** and **- - ** Amplifier output pins. They are spaced to allow for a terminal block to be soldered in place. The output is "Bridge Tied" so that the output connects directly to the speaker pins, no connection to ground.
# Adafruit PAM8302 - Mono 2.5W Class D Audio Amplifier
## Downloads
## Files
- [PAM8302 Datasheet](https://cdn-shop.adafruit.com/datasheets/PAM8302A.pdf)
- [EagleCAD PCB files on GitHub](https://github.com/adafruit/Adafruit-PAM8302-Mono-Amplifier-PCB)
- [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library/blob/master/parts/Adafruit%20PAM8302.fzpz)
## Schematic and Fab Print
## Primary Products
### Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302
[Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302](https://www.adafruit.com/product/2130)
This super small mono amplifier is surprisingly powerful - able to deliver up to 2.5 Watts into 4-8 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.0V-5.5VDC. Since the amp is a class D, its very efficient (over 90% efficient when driving an...
Out of Stock
[Buy Now](https://www.adafruit.com/product/2130)
[Related Guides to the Product](https://learn.adafruit.com/products/2130/guides)
## Featured Products
### Speaker - 3" Diameter - 8 Ohm 1 Watt
[Speaker - 3" Diameter - 8 Ohm 1 Watt](https://www.adafruit.com/product/1313)
Listen up! This 3" diameter speaker cone is the perfect addition to any audio project where you need an 8 ohm impedance and 1W or less of power. We particularly like this cone as it has 4 handy mounting tabs 60mm apart.
Works great with our
In Stock
[Buy Now](https://www.adafruit.com/product/1313)
[Related Guides to the Product](https://learn.adafruit.com/products/1313/guides)
### Speaker - 3" Diameter - 4 Ohm 3 Watt
[Speaker - 3" Diameter - 4 Ohm 3 Watt](https://www.adafruit.com/product/1314)
Listen up! This 3" diameter speaker cone is the perfect addition to any audio project where you need an 4 ohm impedance and 3W or less of power. We particularly like this cone as it has 4 handy mounting tabs 60mm apart.
Works great with our
Out of Stock
[Buy Now](https://www.adafruit.com/product/1314)
[Related Guides to the Product](https://learn.adafruit.com/products/1314/guides)
### Mono Enclosed Speaker with Plain Wires - 3W 4 Ohm
[Mono Enclosed Speaker with Plain Wires - 3W 4 Ohm](https://www.adafruit.com/product/4445)
Listen up! This single 2.8" x 1.2" speaker is the perfect addition to any audio project where you need 4 ohm impedance and 3W or less of power. We particularly like these speakers as they are small and enclosed for good audio volume and quality. This speaker _does..._
In Stock
[Buy Now](https://www.adafruit.com/product/4445)
[Related Guides to the Product](https://learn.adafruit.com/products/4445/guides)
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