PAM8403 Super mini digital amplifier board 2 * 3W Class D digital amplifier board efficient 2.5 to 5V USB power supply – KSH 400 at HIMA TRONICS Mombasa – Top quality amplifiers. Best electronics in Kenya. Shop now for Arduino, ESP32, sensors and IoT devices.
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PAM8403 Super mini digital amplifier board 2 * 3W Class D digital amplifier board efficient 2.5 to 5V USB power supply

SKU: HMJ626 Category: Amplifiers
KSH 400.00
In Stock
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Product Description

PAM8403 Super Mini Digital Amplifier Board 2 x 3W

= High-Efficiency Class D Stereo Amplifier Module =

The PAM8403 is a ultracompact digital Class D amplifier board that delivers 2 x 3W stereo output with high efficiency, making it perfect for portable and batterypowered audio projects . Operating from a 2.5V to 5V power supply, it can be powered directly from a USB port, power bank, or lithium battery .

High efficiency: up to 90% - no heat sink required
Ideal for portable speakers, DIY audio, and embedded projects
Maximum supply voltage: 5.5V - exceeding this will damage the IC

= Technical Specifications =

ParameterValue
Channel Output2 x 3W (stereo)
Power Supply2.5V - 5.5V DC
Recommended Supply5V USB / 3.7V Li-Po
Speaker Impedance4Ω - 8Ω (4Ω recommended)
Efficiency>90% (Class D)
SignaltoNoise Ratio90dB
PCB Size~21 x 18 x 3.4mm

= Key Features =

UltraCompact Tiny footprint fits into any portable device or DIY project

USB Powered - Easily powers from computer USB, power banks, or phone chargers

High Efficiency - 90% efficiency means cool operation without bulky heat sinks

Excellent Noise Suppression Builtin noise cancellation circuits for clear audio

Filterless Design - Unique Class D design with LC filter saves space and cost

Stereo Output - 3W + 3W delivers balanced stereo sound

Protection Features Shortcircuit overcurrent and overtemperature protection

== Applications ==

  • Portable speakers and Bluetooth speakers
  • DIY audio projects and hobbyist amplifiers
  • USB-powered audio devices
  • Battery-powered portable electronics
  • Laptop, monitor, and TV audio
  • Game consoles and speakerphones
  • Headphone amplifiers and projects

= Wiring Guide =

ConnectionTerminalDescription
Power InputVCC / GND2.5V - 5.5V DC (Red/Black)
Audio InputL+ / L-Left Channel (Pink/White)
Audio InputR+ / R-Right Channel (Pink/White)
Speaker OutputL+ / L-Left Speaker (Yellow/Black)
Speaker OutputR+ / R-Right Speaker (Yellow/Black)
The output is CMOS BTL drive mode - all 4 wires are completely independent
Left and right speaker output negatives must NOT be connected together or it will burn the IC

= How It Works =

  1. The PAM8403 is a digital Class D amplifier that switches at a high frequency to achieve up to 90% efficiency
  2. At 5V power supply, each channel delivers 3W output into a 4Ω load
  3. The filterless design reduces component count, making it ideal for compact designs
  4. Excellent noise suppression ensures no hiss, even with ears close to the speaker
The IC uses pulse-width modulation to amplify audio efficiently
Class D is recommended over Class A/B because it does not need heat sinks and takes less space
The module is suitable for batterypowered and USBpowered applications only - not for mains AC power

= Why Choose PAM8403? =

Tiny size fits any DIY or portable project
Runs directly from USB without special power supplies
High 90% efficiency reduces battery drain
No heat sink needed for normal operation
Excellent sound quality with low noise
Overcurrent and overtemperature protection

√ Works with 5V USB power, power banks, and lithium batteries

√ Directly drives 4Ω and 8Ω speakers with clarity

√ No LC filter required for most applications

√ Perfect for audio, robotics, and DIY projects

√ Cost-effective and easy to integrate

√ Simple 2.5V-5V power supply compatibility

= Important Safety Notes =

Maximum supply voltage 5.5V DC - exceeding this damages the IC
Do not connect the left and right channel output negatives together
Always connect speakers before applying power
Use shielded wire for audio input to reduce interference
Do not reverse power supply polarity
For best results, use a clean 5V power supply capable of at least 800mA
Recommended input current: 800mA for full 3W output power

The PAM8403 Super Mini Digital Amplifier Board delivers powerful stereo sound in a footprint smaller than a matchbox. Perfect for portable speakers, DIY audio, and batterypowered projects, it's the ideal choice for highquality audio in compact spaces.

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