STMicroelectronics TDA2822D

Overview

TDA2822D from STMicroelectronics is a dual-channel low-voltage audio power amplifier in SO-8 package, designed for stereo or bridge-tied-load (BTL) operation. It delivers up to 380 mW per channel into 8 Ω at 6 V (stereo) or 400 mW in BTL mode into 8 Ω, with supply voltage range 1.8–15 V and quiescent current of 15 mA - enabling use in battery-powered portable audio devices such as cassette players and CD players.

For engineers reviewing the TDA2822D datasheet, TDA2822D pinout, TDA2822D application, or TDA2822D equivalent, key selection criteria include its dual-channel BTL/stereo flexibility, low 1.8 V start-up voltage, <0.2% THD+N at rated output, 100 kΩ input resistance, and thermal-limited 0.5 W dissipation at 50 °C ambient - critical for compact, thermally constrained audio designs.

Technical Context

The TDA2822D integrates two identical Class-AB amplifier channels on a single die, each with fixed 39 dB closed-loop gain (stereo) or 39 dB in BTL configuration. It supports both independent stereo outputs and single-ended BTL drive, with channel separation ≥50 dB and supply voltage rejection ≥30 dB (100 Hz).

Its input stage uses high-impedance bipolar transistors (Ri = 100 kΩ, Ib = 100 nA), and total input noise is 2.5 µV (22 Hz–22 kHz bandwidth). Output stage biasing minimizes crossover distortion (<0.2% THD+N), and thermal protection activates above junction temperature limits (Tj max = 150 °C).

Key Specifications

Pinout & Package

SO-8 surface-mount package (ECOPACK® compliant), 4.9 mm × 6.0 mm body, 1.27 mm pitch, 1.25 mm height, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-voltage audio amplifier applications.

Compared with LM4863MM/NOPB and TPA2010D1YZFR, the TDA2822D uniquely balances BTL/stereo configurability, sub-2 V start-up, and <0.2% THD+N in a 4.9×6.0 mm SO-8 - making it optimal for cost-sensitive, space-constrained analog audio where fidelity and supply simplicity are primary.

Availability

TDA2822D is available at Aetrix Electronics and suitable for portable audio playback, battery-powered speaker systems, and embedded voice prompt amplification requiring stable component supply and long-term industrial availability.

Supply support for TDA2822D 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog products for automotive, industrial, and consumer markets.

The TDA2822D belongs to ST's legacy audio power amplifier product line, engineered specifically for low-voltage, low-cost portable audio applications where simplicity, thermal robustness, and dual-channel flexibility are essential.

FAQ

Can the TDA2822D operate from a single 3.3 V supply?

Yes. The TDA2822D is fully specified down to 1.8 V supply voltage. At VS = 3.3 V, it delivers 20–35 mW per channel into 32 Ω (headphones) and maintains ≤0.2% THD+N. Quiescent current remains at 15 mA, ensuring predictable battery drain in ultra-low-voltage designs.

What is the maximum safe continuous output power in BTL mode?

In BTL configuration with VS = 6 V and RL = 8 Ω, the TDA2822D delivers up to 400 mW with ≤0.2% THD+N. However, due to its 0.5 W total power dissipation limit at Tamb = 50 °C, continuous operation above ~250 mW requires adequate PCB copper area or airflow to maintain junction temperature below 150 °C.

Does the TDA2822D require external compensation capacitors?

No. The TDA2822D is internally compensated for unity-gain stability. External feedback resistors (e.g., 220 kΩ from Output A to Inverting Input A) set closed-loop gain, but no external capacitor is needed for stability across its specified operating conditions and load ranges.

How is channel separation maintained in stereo layout?

Channel separation ≥50 dB is achieved through internal layout isolation and symmetrical routing. To preserve this, designers must use separate ground return paths for each channel's input and output, avoid shared traces under the SO-8 body, and place decoupling capacitors (10 µF + 100 nF) close to Pin 8 and Pin 3 with short, wide traces.