Adafruit PAM8302 STEMMA Mono 2.5W Class D Audio Amplifier | thingbits

Adafruit PAM8302 STEMMA Mono 2.5W Class D Audio Amplifier

Name: Adafruit PAM8302 STEMMA Mono 2.5W Class D Audio Amplifier
SKU: TH1985
Price: 699.0 INR
Availability: InStock

SKU: TH1985

₹824.82

₹699.00 (Ex. of GST)

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The Adafruit PAM8302 STEMMA Mono 2.5W Class D Audio Amplifier is a tiny yet capable audio amplifier designed to drive real speakers directly from low-voltage projects. Powered by an efficient Class D amplifier core, it delivers up to 2.5W of mono output into 4–8Ω speakers while operating from a wide 2.0V–5.5V supply, making it an excellent choice for battery-powered and portable builds.

₹824.82

₹699.00 (Ex. of GST)

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Overview

Unlike older LM386-based designs, this amplifier runs cool and efficiently (over 90% efficiency in typical use), with built-in thermal and over-current protection for reliable operation. An onboard trim potentiometer allows easy volume adjustment from the default 24dB gain, so you can fine-tune output levels without modifying your audio source.

This STEMMA version is designed for true plug-and-play use. Audio input is provided via a 3-pin JST-PH connector, allowing quick connections using pre-crimped cables, pin headers, or alligator clips—no soldering required. To simplify the design, the input is single-ended and referenced to the power/signal ground rather than using differential inputs.

The amplifier output uses a bridge-tied-load (BTL) configuration, meaning both speaker wires connect directly to the amplifier outputs with no connection to ground. Audio is delivered as a high-frequency (~250kHz) PWM signal that is naturally smoothed by the speaker coil, eliminating the need for bulky output filters. Because of this design, the board is intended to drive speakers directly and should not be connected to another amplifier stage.

(Speaker not included; use any speaker with 4Ω or higher impedance.)

Specification

Technical details for Adafruit PAM8302 STEMMA Mono 2.5W Class D Audio Amplifier.

Specification	Details
Amplifier IC	PAM8302
Amplifier Type	Class D (high-efficiency, filterless design)
Audio Channels	Mono
Operating Voltage	2.0V – 5.5V DC
Output Power	2.5W @ 4Ω, 10% THD (5.5V supply) 1.5W @ 8Ω, 10% THD (5.5V supply)
Recommended Speaker Impedance	4Ω or higher (4–8Ω typical)
Output Configuration	Bridge-Tied Load (BTL) – speaker connects directly to OUT+ and OUT-
Switching Frequency	~250 kHz PWM
Input Type	Single-ended audio input referenced to power/signal ground
Input Coupling	1.0µF AC-coupled input capacitors
Gain	Fixed 24 dB gain with onboard trim potentiometer for volume adjustment
Power Supply Rejection Ratio (PSRR)	50 dB @ 1 kHz
Efficiency	>90% efficiency (typical with 8Ω speaker at moderate output)
Quiescent Current	~4 mA
Shutdown Current	~0.5 mA (due to pull-up resistor on SD pin)
Protection Features	Thermal protection, short-circuit and over-current protection
Input Connector	3-pin JST-PH connector (STEMMA compatible)
Speaker Connector	3.5mm screw terminal block
Included Accessories	Breadboard header screw terminal block (color may vary)
Typical Applications	Portable audio projects, alerts, sound effects, embedded systems, battery-powered devices

Pinout

Pin / Connector	Label	Description
Power	VIN	Power input pin. Supply the board with 3V–5V DC. Available via STEMMA connector and through-hole pad.
Power	GND	Common ground for power and signal. Available via STEMMA connector and through-hole pad.
Audio Input	SIGNAL	Line-level audio input (~1Vpp). AC-coupled via onboard capacitors, allowing DC offset if needed. Available via STEMMA connector and through-hole pad.
Audio Output (BTL)	VO+	Positive speaker output. Connect directly to the positive terminal of a 4–8Ω speaker.
Audio Output (BTL)	VO-	Negative speaker output. Connect directly to the negative terminal of a 4–8Ω speaker. Not connected to ground.
STEMMA JST-PH Connector	SIGNAL (White)	Audio input pin. Accepts line-level AC or DC-coupled audio signal.
	VIN (Red)	Power input pin. Supply 3V–5V DC to power the amplifier.
	GND (Black)	Ground reference for power and audio signal.
Speaker Terminal Block	–	Speaker negative terminal. Electrically identical to VO-.
Speaker Terminal Block	+	Speaker positive terminal. Electrically identical to VO+.
Onboard Control	Volume Trimpot	Adjusts output volume from the default 24dB gain level.
Indicators & Jumpers	Power LED	Green LED labeled ON, indicates when the board is powered.
Indicators & Jumpers	LED Jumper	Rear-side jumper to disable the power LED. Cut the trace to turn off LED; re-solder pads to re-enable.