Diodes Incorporated PAM8302LAYCR

Overview

PAM8302LAYCR from Diodes Incorporated is a 2.5W filterless Class-D mono audio amplifier in DFN3x3-8 package, operating from 2.0V to 5.5V supply, delivering 2.5W into 4Ω at 10% THD+N with 88% peak efficiency and 0.35% typical THD+N at 0.1W. It drives speakers directly without output filters and supports shutdown control for portable battery-powered audio systems including Bluetooth speakers and handheld communication devices.

For engineers reviewing the PAM8302LAYCR datasheet, PAM8302LAYCR pinout, PAM8302LAYCR application, or PAM8302LAYCR equivalent, key selection criteria include its filterless BTL output architecture, low 4–8mA quiescent current, thermal shutdown (120–135°C), ±0.4V shutdown logic thresholds, and dual-package availability (DFN3x3-8 vs MSOP-8) affecting PCB area and thermal resistance (θJA = 50°C/W).

Technical Context

The PAM8302LAYCR implements a two-stage internal amplifier topology: the first stage provides externally configurable gain via resistor feedback (RF/RI), while the second stage delivers fixed 2× differential gain, enabling total closed-loop gain up to 24dB. Its oscillator operates at 200–300kHz, supporting filterless operation by generating high-frequency PWM signals that speaker inductance naturally integrates.

It integrates short-circuit protection, over-temperature shutdown with 30°C hysteresis, under-voltage lockout (UVLO) at 2.1V, and low-noise A-weighted input-referred noise of 120–200µV. The device uses CMOS output stage MOSFETs with RDS(ON) of 0.45Ω (P-ch) and 0.25Ω (N-ch), enabling high efficiency and low heat dissipation in compact layouts.

Key Specifications

Pinout & Package

Package: DFN3x3-8 (3.0mm × 3.0mm, 0.5mm pitch, exposed thermal pad). Thermal resistance θJA = 50°C/W enables 2W continuous output without external heatsink at TA = +25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPA2012D2RTJR and MAX9718ETA+T, the PAM8302LAYCR offers the smallest footprint and lowest BOM cost for 2.5W portable audio, trading off minor PSRR margin and no boost capability for direct filterless simplicity and thermal performance in DFN3x3-8.

Availability

PAM8302LAYCR is available at Aetrix Electronics and suitable for Bluetooth speakers, handheld GPS units, and walkie-talkie audio subsystems requiring stable component supply, consistent DFN3x3-8 packaging, and long-term production continuity.

Supply support for PAM8302LAYCR 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and audio solutions for consumer, industrial, and automotive markets.

The PAM8302L belongs to Diodes' Class-D audio amplifier product line, engineered specifically for space- and power-constrained portable electronics where filterless operation, low quiescent current, and thermal robustness are primary design requirements.

FAQ

What is the maximum continuous output power of PAM8302LAYCR at 3.6V?

At 3.6V supply and 10% THD+N into 4Ω, the PAM8302LAYCR delivers 1.10–1.25W typical continuous output power. Derating is required above +60°C ambient due to thermal limits; full 2.5W is only achievable at 5V with adequate PCB copper area for heat spreading.

Does PAM8302LAYCR require external input coupling capacitors?

Yes - an input capacitor (CI) is mandatory to block DC offset from source and establish proper AC-coupled bias. Recommended value is 0.1–0.22µF ceramic or low-leakage tantalum, selected based on lowest target frequency (e.g., 0.16µF for 100Hz corner with 10kΩ input impedance).

How does the shutdown pin (SD) behave electrically?

The SD pin is active-low with VIH ≥1.2V (enable) and VIL ≤0.4V (disable). Internal pull-down is absent; external 100kΩ pull-up to VDD is required for default-enable operation. Driving SD to GND reduces supply current to 1µA and mutes output with minimal pop.

Can PAM8302LAYCR drive an 8Ω speaker, and what is the output power?

Yes - at 5V supply and 10% THD+N, it delivers 1.35–1.50W into 8Ω. At 3.6V, output drops to 0.72–0.80W. Efficiency remains >85%, but thermal rise is lower than with 4Ω loads due to reduced current, allowing longer duty cycles in compact enclosures.