Diodes Incorporated PAM8303DBSC

Overview

PAM8303DBSC from Diodes Incorporated is a 3W ultra-low-EMI, filterless mono Class-D audio power amplifier in MSOP-8 package, featuring differential input, 90% peak efficiency at 1W into 8Ω, <1µA shutdown current, and operation from 2.8V to 5.5V supply. It delivers 3W output at 10% THD into 4Ω at 5V, with -63dB PSRR at 217Hz and integrated thermal shutdown/short-circuit protection - deployed in space-constrained portable audio devices including smartphones and MP3 players.

For engineers reviewing the PAM8303DBSC datasheet, PAM8303DBSC pinout, PAM8303DBSC application, or PAM8303DBSC equivalent, key selection criteria include its BTL output architecture, EMI performance (-20dB vs FCC Class-B @300MHz), filterless operation reducing external component count, and thermal resistance (θ_JA = 180°C/W) for handheld thermal management.

Technical Context

The PAM8303DBSC implements a fully differential Class-D modulator with BTL (bridge-tied load) output stage, enabling direct drive of 4Ω or 8Ω speakers without LC output filters. Its high PSRR (-63dB at 217Hz) and CMRR (>300dB) suppress supply and common-mode noise in noisy mobile environments.

It integrates UVLO (2.3V threshold), non-latched thermal shutdown (trip at +135°C ±15°C, recovery at +105°C), and pop/click suppression via internal reference ramping. Shutdown control is active-low on SD pin, reducing quiescent current to <1µA while preserving fast wake-up.

Key Specifications

Pinout & Package

The PAM8303DBSC is housed in an MSOP-8 package (3.0mm × 4.9mm × 1.1mm height), optimized for compact PCB layout with exposed thermal pad (connected to GND) for enhanced heat dissipation. Pin 1 is marked by a dot; pin numbering follows standard MSOP convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mono Class-D audio amplifier applications.

Compared with PAM8304 and TPA2012D2, the PAM8303DBSC uniquely combines filterless operation, differential input, and best-in-class PSRR for space- and noise-constrained mono audio systems - making it optimal for smartphone speaker amplification where BOM reduction and GSM immunity are primary design goals.

Availability

PAM8303DBSC is available at Aetrix Electronics and suitable for smartphone audio subsystems, portable media player output stages, GPS navigation voice feedback, and digital photo frame alert tone generation requiring stable component supply and long-term production continuity.

Supply support for PAM8303DBSC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and precision analog solutions for consumer, industrial, and communications markets.

The PAM8303DBSC belongs to Diodes' PAM series of Class-D audio amplifiers, engineered specifically for ultra-low-EMI, filterless operation in battery-powered portable electronics - prioritizing efficiency, small footprint, and robust noise immunity.

FAQ

What is the recommended input capacitor value for PAM8303DBSC with 150kΩ input resistors?

A 10nF ceramic capacitor is recommended when using 150kΩ input resistors to achieve flat bass response down to 150Hz. This value balances low-frequency extension with minimal DC offset caused by capacitor leakage. Low-leakage X7R or C0G dielectrics are preferred; polarity must be verified since the amplifier biases inputs at VDD/2.

Does PAM8303DBSC require external output filtering for FCC compliance?

No - the PAM8303DBSC's filterless architecture meets FCC Class-B radiated emissions limits without external LC filters, achieving -20dB margin at 300MHz. However, a ferrite bead may still be added near the outputs in high-noise environments to further suppress harmonics above 1MHz.

How does the thermal shutdown mechanism behave under sustained overload?

The PAM8303DBSC features non-latched thermal shutdown that activates at +135°C ±15°C and recovers automatically at +105°C (30°C hysteresis). During overload, outputs disable immediately, then resume normal operation once die temperature falls below the recovery threshold - preventing thermal damage without requiring system reset.

Can PAM8303DBSC operate from a 3.3V supply while delivering full 3W output?

No - at 3.3V supply, maximum output is 1.35W @10% THD into 4Ω. Full 3W output requires ≥5V supply. For 3.3V systems, expected output is 1.2–1.35W; efficiency remains >85%, but voltage headroom limits peak power capability.