Diodes Incorporated PAM8003DR

Overview

PAM8003DR from Diodes Incorporated is a filterless 2.5W Class-D stereo audio amplifier in SO-16 package, delivering 2.5W output at 10% THD+N into 4Ω with 5V supply, featuring 64-step DC volume control and low quiescent current (4.5–7.0 mA). It drives speakers directly without LC filters, reducing BOM cost and PCB area in portable audio systems.

For engineers reviewing the PAM8003DR datasheet, PAM8003DR pinout, PAM8003DR application, or PAM8003DR equivalent, key selection criteria include its filterless operation, dual-channel 2.5W/4Ω capability, shutdown control (SHDN), VOLUME terminal for gain setting, and thermal shutdown at 150°C.

Technical Context

The PAM8003DR integrates dual Class-D PWM modulators with internal analog reference (VREF) and independent left/right power domains (PVDDL/PVDDR, PGNDL/PGNDR). Its filterless architecture uses differential outputs (+OUTL/–OUTL, +OUTR/–OUTR) to cancel EMI and eliminate external LC filters.

It implements undervoltage lockout (UVLO) triggering at 2.0V and releasing at 2.2V, short-circuit protection that disables outputs on fault and auto-recovers, and over-temperature protection with 150°C trip point and 30°C hysteresis for stable thermal cycling.

Key Specifications

Pinout & Package

The PAM8003DR is housed in a 16-pin SOIC (SO-16) package with exposed thermal pad (not electrically connected), 1.27 mm pitch, and standard JEDEC outline dimensions (9.9 × 6.0 mm body).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPA2013D1RTJR and MAX9718ETA+, the PAM8003DR uniquely combines filterless operation, analog DC volume control, and sub-7 mA quiescent current - making it optimal for cost-sensitive, space-constrained portable audio where simplicity and battery life are prioritized over digital configurability.

Availability

PAM8003DR is available at Aetrix Electronics and suitable for portable speakers, notebook computers, LCD monitors, and portable DVD players requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for PAM8003DR 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 design centers in Asia, Europe, and the U.S., serving industrial, computing, consumer, and communications markets.

The PAM8003DR belongs to Diodes' Class-D audio amplifier product line, engineered specifically for high-efficiency, low-EMI stereo audio playback in battery-powered and space-constrained consumer electronics.

FAQ

What is the minimum recommended supply voltage for reliable operation of the PAM8003DR?

The PAM8003DR operates reliably from 2.5V to 5.5V. Its undervoltage lockout activates below 2.0V and releases at 2.2V, so sustained operation below 2.5V risks intermittent shutdown. For stable performance with 4× alkaline cells, use 3-cell (4.5V max) or 4× Ni-MH (4.8V nominal) configurations to avoid exceeding the 6.0V absolute maximum rating.

How does the VOLUME pin function, and what voltage range sets gain?

The VOLUME pin accepts a DC voltage from 0V to VDD to select one of 64 discrete gain steps ranging from –75 dB to +24 dB. A 0V input yields minimum gain; VDD yields maximum gain. The step resolution is linear in dB, with each increment adjusting gain by ~1.2 dB. No external resistor divider is needed - direct MCU DAC or potentiometer connection suffices.

Why is a bypass capacitor required on the VREF pin, and what value is optimal?

VREF (Pin 6) supplies the internal analog reference for modulation and biasing. A 0.1–1.0 µF ceramic capacitor to GND stabilizes startup timing, suppresses power-supply-induced noise on the reference, and reduces turn-on/turn-off click-pop. Values ≥0.47 µF provide best THD+N and PSRR; values <0.1 µF risk instability and audible artifacts during state transitions.

Can the PAM8003DR drive 8Ω speakers, and what output power is achievable?

Yes - the PAM8003DR delivers 1.65W at 10% THD+N into 8Ω with 5V supply, and 1.3W at 1% THD+N. While optimized for 4Ω loads, it remains fully functional at 8Ω with lower thermal stress and improved efficiency (87% vs. 79% at 4Ω). Output power scales approximately with V²/R, so 3.6V operation yields ~0.85W into 8Ω.