PAM8302 2.5W Single Channel Class D Audio Power Amplifier

PAM8302 2.5W Single Channel Class D Audio Power Amplifier Board is an ultra-compact, highly efficient mono audio amplification module designed exclusively for low-power, portable sound projects. Utilizing an advanced filterless Class-D architecture, this miniature amplifier drives small speakers with astonishing clarity without requiring bulky output filters or external heat sinks. Consequently, hardware developers extensively use this module in battery-operated handheld devices, miniature arcade builds, and custom robotics requiring a loud, clear voice. It expertly delivers up to 2.5W of maximum output power into a 4Ω impedance load while operating reliably from a standard 5V logic supply. Furthermore, its extremely low quiescent current and dedicated shutdown pin significantly extend battery life during periods of audio inactivity. Therefore, whether you are soldering together a custom pocket synthesizer or adding sound effects to a prop replica, this amplifier offers exceptional acoustic punch in a microscopic footprint.

Key Features:

• Filterless Class-D Design: The innovative architecture allows you to connect the speaker directly to the output pins, therefore heavily reducing external component count and saving PCB space.
• High Efficiency Operation: Boasting up to 90% operating efficiency, the module minimizes heat buildup and drastically extends the runtime of battery-powered systems.
• Differential Input Ready: The isolated A+ and A- audio inputs effectively reject common-mode noise, consequently delivering a cleaner audio signal from noisy microcontrollers.
• Low Power Shutdown Mode: Integrating a dedicated shutdown pin enables the host device to put the amplifier to sleep, drawing merely 1μA of current.
• Built-In Protections: Features comprehensive thermal overload and robust short-circuit protection to prevent the IC from sudden catastrophic failure.

Technical Specifications:

• Operating Voltage (V_DD): 2.0 V to 5.5 V DC (Optimal 5.0 V)
• Maximum Output Power: 2.5 W (Mono, at 4 Ω load, 5.5 V supply, 10% THD)
• Supported Speaker Impedance: 4 Ω to 8 Ω (Delivers 1.5W into 8 Ω)
• Amplification Class: Class-D mono digital amplification
• Signal-to-Noise Ratio (SNR): > 95 dB
• Total Harmonic Distortion (THD+N): ≈ 0.1% (at 1 W output into 4 Ω)
• Quiescent Current: ≈ 4 mA (Operating) / 1 μA (Shutdown)

Mechanical Specifications:

• Board Material: High-quality FR4 Fiberglass PCB
• Onboard Control: Certain module variations feature a tiny onboard trim potentiometer for manual volume/gain adjustment.
• Connection Type: Requires soldering wires or standard 2.54mm pin headers to the plated through-holes.
• Cooling Requirement: Needs zero external cooling; the IC manages its own thermal load efficiently.
• Weight: ≈ 1.5 grams

Dimensions:

• Board Length: ≈ 24.0 mm
• Board Width: ≈ 16.0 mm
• Board Thickness: ≈ 2.0 mm (excluding headers)

Pinout and Wiring:

• VIN / VCC: Connect this pin to a clean 2.0V to 5.5V DC power source.
• GND: Connect this strictly to the common ground of your power supply.
• A+ / IN+: Solder the positive audio signal wire from your microcontroller or DAC here.
• A- / IN-: Solder the negative differential audio signal here. However, if using a single-ended audio source, tie this pin directly to GND.
• SD (Shutdown): Pulling this pin to logic LOW disables the amplifier. Leave floating or pull HIGH to operate normally.
• OUT+ / OUT-: Wire these output terminals directly to your speaker coil. Do NOT connect either of these pins to ground.

Datasheet Reference:

• Download PAM8302A Audio Amplifier Datasheet

Commonly Used in:

• Custom Synthesizers: Driving a small built-in speaker for pocket-sized Arduino or Raspberry Pi-based digital instruments.
• Micro Arcade Cabinets: Providing the loud, punchy retro sound effects required for miniature gaming consoles.
• Talking Robots: Serving as the clear vocal amplification module for interactive, battery-powered robotic toys specifically.

Applications:

• GPS Navigation Devices: Enhancing the volume of verbal turn-by-turn directions in custom automotive dash displays.
• Medical Alarm Systems: Emitting sharp, unmistakable warning tones in portable medical monitoring equipment.
• Museum Displays: Providing localized, low-power audio narration when viewers trigger a proximity sensor consequently.

Equivalent Models:

• PAM8302A: The direct identical variant commonly found on the actual breakout board, featuring slightly optimized internal logic.
• MAX98357A: A highly advanced alternative mono Class-D amplifier designed specifically to accept digital I2S audio signals rather than analog inputs.
• TPA2005D1: A similar Texas Instruments 1.4W mono Class-D amplifier frequently used in equivalent ultra-low power applications.

Package Includes:

• 1 x PAM8302 2.5W Single Channel Class D Audio Power Amplifier Board
• 1 x 2.54mm Pitch Male Header Pin Strip