Diodes Incorporated PAM8302AASCR

Overview

PAM8302AASCR from Diodes Incorporated is a 2.5W filterless Class-D mono audio amplifier optimized for portable battery-powered devices. It delivers 2.5W into 4Ω at 10% THD+N with 5V supply, achieves up to 88% peak efficiency, and operates across 2.0–5.5V supply range. Its differential input architecture, integrated thermal shutdown, and short-circuit protection enable direct speaker drive in compact PMP, GPS, and hands-free phone designs.

For engineers reviewing the PAM8302AASCR datasheet, PAM8302AASCR pinout, PAM8302AASCR application, or PAM8302AASCR equivalent, key selection criteria include output power vs. supply voltage, THD+N performance at low power levels, filterless EMI behavior, and MSOP-8 thermal resistance (θ_JA = 180°C/W) for space-constrained PCB layouts.

Technical Context

The PAM8302AASCR implements a fixed-frequency (200–300 kHz) PWM modulation scheme with internal oscillator and dual-MOSFET half-bridge output stage. Its differential input supports 23.5 dB fixed gain via internal 150 kΩ/10 kΩ resistor ratio, eliminating external gain-setting components in baseline configurations.

Protection logic includes undervoltage lockout (UVLO) triggering at ≤2.1 V, thermal shutdown activation at +120–+135°C junction temperature with +30°C hysteresis, and cycle-by-cycle short-circuit detection on both output terminals.

Key Specifications

Pinout & Package

Supplied in MSOP-8 package (3.0 mm × 4.9 mm, 0.65 mm pitch), the PAM8302AASCR uses a thermally enhanced exposed pad for improved 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 Class-D mono audio amplifier applications.

Compared with TPA2012D2RTJR and MAX9718ETA+, the PAM8302AASCR provides optimal balance of filterless simplicity, 2.5W capability, and MSOP-8 thermal performance for space-limited portable designs-without requiring external inductors or voltage boosting circuitry.

Availability

PAM8302AASCR is available at Aetrix Electronics and suitable for portable media players, GPS navigation units, and hands-free speakerphones requiring stable component supply across consumer electronics production cycles.

Supply support for PAM8302AASCR 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan, China, and Malaysia.

The PAM8302A belongs to Diodes' Class-D audio amplifier product line, engineered specifically for ultra-compact, battery-efficient audio output in portable consumer electronics-emphasizing filterless operation, low quiescent current, and robust thermal protection.

FAQ

What is the minimum recommended input capacitor value for PAM8302AASCR?

The datasheet specifies a 0.1 µF to 0.22 µF ceramic or low-leakage tantalum capacitor for CI. A 0.1 µF value is sufficient for applications targeting ≥100 Hz bass response, while 0.22 µF extends low-frequency flatness to ~50 Hz. Larger values increase DC offset risk and may degrade pop/click suppression during startup.

Can PAM8302AASCR drive an 8Ω speaker at full rated power?

Yes-it delivers 1.50 W into 8Ω at 10% THD+N with 5V supply, and 0.80 W at 1% THD+N. While maximum output is lower than into 4Ω, this remains sufficient for small-form-factor speakers in GPS or radio applications where SPL requirements are moderate.

How does the shutdown pin behave during power-up sequencing?

The SD pin must remain high for ≥1 ms after VDD reaches 2.1 V to ensure reliable startup. If SD transitions low before VDD stabilizes, the device enters UVLO state and will not activate until both VDD exceeds 2.1 V and SD is high. A 10 ms RC delay on SD is recommended for robust sequencing.

Is the exposed pad on PAM8302AASCR electrically connected internally?

Yes-the exposed pad is internally tied to GND and serves as the primary thermal and electrical return path. It must be soldered to a solid copper ground plane covering ≥80% of the pad area; failure to do so increases θ_JA by >40°C and risks thermal shutdown under continuous 2.5W operation.