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Slkor PAM8403 Class-D Audio Power Amplifier: High-Efficiency Stereo SMD Power Amplifier Chip
2026-09-05
17
In consumer audio products such as Bluetooth speakers, portable players, laptops and small home appliance voice prompt devices, the conversion efficiency, heat generation, peripheral circuit complexity and voltage adaptability of power amplifier chips directly determine the overall sound quality, battery life and PCB layout difficulty of terminal equipment. Traditional Class-AB power amplifiers suffer from high heat generation and low efficiency, requiring numerous peripheral components and hindering miniaturized product design. The Slkor PAM8403 is a filter-free Class-D stereo audio power amplifier packaged in SOP-16. It delivers up to 3W single-channel output power, supports a wide supply voltage range from -0.3V to 5.5V, and features low operating current and ultra-low standby current. With the advantages of high efficiency, low heat dissipation and minimal peripheral components, it serves as a cost-effective domestic amplifier solution for battery-powered audio devices.
1. Core Product Parameters
Device Type: Class-D Stereo Audio Power Amplifier Supply Voltage (VDD): -0.3V ~ 5.5V Operating Temperature (TA): -40℃ ~ 85℃ Single-channel Output Power (Po): 3W Operating Quiescent Current (IDD): 6.3mA Shutdown Standby Current (ISD): 16μA Package: SOP-16
2. Core Product Advantages
2.1 Filter-Free Class-D Architecture Simplifies Hardware Design
Adopting a proprietary filter-free design, the PAM8403 can directly drive speakers without traditional output low-pass filter circuits. It greatly reduces peripheral BOM components, saves valuable PCB layout space, lowers overall material costs, and shortens product development cycles, perfectly catering to lightweight and miniaturized audio product design trends.
2.2 High Conversion Efficiency and Low Heat Generation Extend Battery Life
Featuring a maximum conversion efficiency of 90%, the chip effectively reduces power loss compared with conventional Class-AB amplifiers. It generates extremely low heat during operation and requires no additional heat sink in most working conditions. Ideal for 3.7V lithium battery and 5V USB-powered portable devices, it significantly improves equipment endurance and battery utilization efficiency.
2.3 Wide Voltage Adaptability Compatible with Mainstream Power Systems
Supporting a wide voltage range of -0.3V to 5.5V, the chip is fully compatible with mainstream power supply modes such as lithium batteries and USB 5V power supplies. Equipped with an independent shutdown control pin, it reduces standby current to only 16μA in sleep mode, effectively lowering idle power consumption and meeting low-power design requirements of portable electronic products.
2.4 Low Distortion and Low Noise for Clear Sound Quality
The PAM8403 achieves ultra-low total harmonic distortion (THD+N) and minimal background noise, delivering pure and stereo sound output. Built-in short-circuit protection and over-temperature shutdown protection functions effectively avoid chip damage caused by abnormal operating conditions, greatly improving the stability and service life of audio equipment.
2.5 Standard SOP-16 Package for Mass Production
Packaged in standard SOP-16 SMD form factor, the device supports automated SMT mounting with mature welding technology and compact size, suitable for high-density PCB layout. Verified by large-scale mass production, Slkor PAM8403 features stable parameter consistency and pin-to-pin compatibility with imported equivalent chips. It solves the industry pain points of long lead times and high costs of imported devices, supporting stable mass production supply.
3. Main Application Fields
With the comprehensive strengths of high efficiency, low power consumption, low noise and simple peripheral circuits, the Slkor PAM8403 is widely used in various small-power stereo audio scenarios: Bluetooth portable speakers, laptop audio output, display and TV sound systems, portable DVD players, game consoles, walkie-talkie hands-free systems, small home appliance voice prompters, smart toys, DIY audio modules, USB-powered mini speakers, and IoT voice broadcast terminals.
4. Engineering Design Guidelines
Power Supply Design: Do not exceed the maximum 5.5V supply voltage. Place decoupling capacitors close to power pins to suppress power noise and optimize audio background noise performance.
Load Matching: Recommended to match 4Ω~8Ω speakers. It can achieve 3W stable output power with 4Ω load under 5V power supply.
Shutdown Pin Control: The shutdown pin can be controlled by MCU to realize sleep switching, effectively reducing system standby power consumption during idle state.
PCB Layout: Keep power output traces short and thick. Isolate audio input traces from power loops to avoid electromagnetic interference and audio noise.
Protection Instructions: Built-in short-circuit and thermal shutdown protections are designed for fault protection only. Do not operate the chip under long-term short-circuit conditions.
Temperature Range: The normal operating temperature range is -40℃ to 85℃. Operation beyond the specified range is prohibited to ensure stable performance.
5. Product Summary
The Slkor PAM8403 is a SOP-16 packaged 3W dual-channel Class-D audio power amplifier chip, featuring wide voltage support (-0.3V~5.5V), low operating current (6.3mA), ultra-low shutdown current (16μA) and wide temperature adaptability (-40℃~85℃). With filter-free architecture, high efficiency, low heat generation and minimal peripheral components, it balances excellent sound quality and low power consumption. It is the preferred cost-effective domestic alternative solution for various USB and battery-powered mini stereo audio devices in the consumer electronics industry.
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