Digital Amplifier Board PAM8403
$0.99
Ultra-compact size, low power consumption, high fidelity!
| Dimensions | 22 × 18 mm |
|---|---|
| Brand |
easyelecmodule |
4501 in stock
Core Advantages of PAM8403
Ultra-Miniaturization for Narrow Spaces
The size of a common PAM8403 amplifier board is only about 22mm × 18mm. Its compact size can be easily embedded in devices where space is extremely precious, such as TWS earbud charging cases, smart watch speaker modules, and miniature Bluetooth speakers, without the need to reserve additional space for the amplifier.
Wide-Range Low-Voltage Power Supply with Strong Compatibility
The power supply voltage range is usually 2.5V – 5.5V, which exactly covers the mainstream power sources of miniature devices: 3.7V lithium batteries (4.2V when fully charged), 5V USB interfaces (such as power banks and computer USB ports), and 2 dry batteries (3V) can all drive it directly. No additional voltage stabilization circuit is required, which reduces the design complexity.
High Power + Low Distortion for Reliable Sound Quality
Under 5V power supply, the rated output power of each channel of PAM8403 can reach 3W (with a 4Ω load). This driving force is sufficient to drive most miniature speakers (such as full-range speakers with a diameter of 20mm – 40mm). At the same time, its total harmonic distortion (THD+N) is as low as 0.1% (at 1kHz frequency), which is much lower than that of traditional analog amplifiers (usually 0.5% – 1%). It can restore clear and noise-free audio details and avoid problems such as “sound breakage” and “distortion”.
Ultra-Low Power Consumption + Overheating Protection for Safety and Durability
As a Class D digital amplifier, the conversion efficiency of PAM8403 is as high as over 90% (the efficiency of traditional Class A amplifiers is only 20% – 30%). This means that most of the electrical energy is converted into audio power rather than heat. Even when working at full power, the surface temperature of the module is only 5 – 10℃ higher than the ambient temperature, so no additional heat sink is needed. In addition, the chip has built-in overcurrent protection, overheating protection, and undervoltage protection functions. When the load is short-circuited, the temperature is too high, or the power supply is insufficient, it will automatically cut off the output to prevent the chip from being burned.
Pin Definition Analysis
- VCC:Positive terminal of the power supply (connected to the positive terminal of a 5V USB power supply or a 3.7V lithium battery);
- GND:Negative terminal of the power supply (connected to the negative terminal of the power supply, the negative terminal of the audio input device, and the negative terminal of the speaker; “common ground” is required);
- L_IN:Left-channel audio signal input terminal (connected to left-channel signal sources such as the mobile phone headphone jack or the audio output pin of a single-chip microcomputer);
- R_IN: Right-channel audio signal input terminal (connected to right-channel signal sources such as the mobile phone headphone jack or the audio output pin of a single-chip microcomputer);
- L_OUT+/-: Left-channel speaker output terminal (connected to the positive and negative terminals of the left speaker);
- R_OUT+/-: Right-channel speaker output terminal (connected to the positive and negative terminals of the right speaker).
PAM8403 DATASHEET
Debugging and Pitfall Avoidance: Key Notes
1、Match the speaker impedance: The optimal load impedance of PAM8403 is 4Ω – 8Ω. If a 16Ω high-impedance speaker is used, the output power will be significantly reduced; if a 2Ω low-impedance speaker is used, overcurrent protection may be triggered due to excessive current, resulting in no sound output.
2、Avoid “common ground noise”: If there is “current sound” or “noise” during playback, first check the “common ground” – ensure that the GND of the power supply, audio input device, and speaker are fully connected (you can try to directly connect the GND of each device with a wire).
3、Control the volume to avoid overload: Although PAM8403 has protection functions, long-term full-power playback (such as turning the volume to the maximum) will still accelerate the aging of components. It is recommended to control the volume at 70% – 80% during daily use (based on no distortion).
PAM8403 vs. Similar Amplifiers: Why Choose It?
Comparison Dimension | PAM8403 | TPA3116 | PAW8403 |
Size | Small (about 22mm×18mm) | Larger (about 25mm×18mm) | Ultra-small (about 15mm×10mm) |
Power Supply Voltage | 2.5V – 5.5V (low-voltage compatible) | 8V – 26V (high-voltage, high-power) | 2.5V – 5.5V |
Output Power (5V) | 3W×2 (4Ω, dual-channel) | Unable to drive (insufficient voltage) | 3W×2 (4Ω, dual-channel) |
Efficiency | 90%+ | 85%+ | 90%+ |
Distortion (THD+N) | 0.1% (1kHz) | 0.01% (but requires high voltage) | 0.1% (1kHz) |
Application Scenario | Miniature low-voltage devices (headphones, bracelets) | Medium and high-power devices (desktop speakers) | Miniature low-voltage devices (more compact scenarios) |
Shipping Cost
We only ship to the United States. Shipping costs are calculated based on the total order amount.
Shipping Method And Delivery Time
All orders will be processed and shipped within 72 hours of placing the order (excluding weekends and holidays). They will ship from Shenzhen, China, primarily via 4PX logistics. Depending on the destination and logistics conditions, other carriers such as DHL, FedEx, UPS, USPS, etc., may also handle the delivery. Estimated shipping time is 7-12 business days, with actual delivery occurring in 10-17 business days, depending on logistics conditions.
Payment:
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