STMicroelectronics TDA2822M

Overview

TDA2822M from STMicroelectronics is a dual low-voltage audio power amplifier IC in 8-lead Minidip package, designed for stereo or bridge-tied load (BTL) operation. It delivers up to 450 mW per channel into 32 Ω at 3 V, features 1.8 V minimum supply voltage, <0.2% THD+N at 1 kHz, and 39 dB typical closed-loop gain-used in portable cassette players and battery-powered radios.

For engineers reviewing the TDA2822M datasheet, TDA2822M pinout, TDA2822M application, or TDA2822M equivalent, key selection criteria include low-quiescent-current operation (6–9 mA), BTL vs. stereo configuration flexibility, thermal resistance (R_{th j-amb} = 100 °C/W), and compatibility with single-cell alkaline/NiMH supplies.

Technical Context

The TDA2822M integrates two identical Class-AB amplifier channels on a monolithic die, supporting independent stereo output or combined BTL mode for doubled voltage swing across a single load. Its input stage uses high-impedance bipolar transistors (R_i = 100 kΩ), and internal biasing enables stable operation down to 1.8 V with quiescent current as low as 6 mA.

It employs fixed-gain architecture (G_v = 39 dB typ.) with no external feedback network required, and achieves 50 dB channel separation at 1 kHz. Supply rejection is 30 dB at 100 Hz with 100 µF bypass capacitors, and total input noise is 2.5 µV (A-weighted) with 10 kΩ source impedance.

Key Specifications

Pinout & Package

Package: 8-lead Minidip (SO-8 footprint variant), body dimensions 10.92 × 7.95 mm, lead pitch 2.54 mm, R_{th j-amb} = 100 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7211A and LM4862, the TDA2822M uniquely balances sub-2 V operation, ultra-low quiescent current, and Minidip compatibility-making it optimal for legacy portable audio designs constrained by cost, size, and single-cell battery voltage.

Availability

TDA2822M is available at Aetrix Electronics and suitable for portable audio playback, battery-powered radio receivers, low-power speaker drivers, and embedded audio feedback systems requiring stable component supply and long-term obsolescence management.

Supply support for TDA2822M 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The TDA2822M belongs to ST's legacy audio power amplifier product line, engineered specifically for cost-sensitive, battery-operated portable audio equipment with minimal external component count.

FAQ

What is the maximum safe supply voltage for continuous operation?

The absolute maximum supply voltage is 15 V, but continuous operation above 9 V requires careful thermal management. At 15 V with 8 Ω load in BTL mode, junction temperature can exceed 150 °C even at ambient 50 °C due to R_{th j-amb} = 100 °C/W. For reliable long-term use, ST recommends ≤9 V with adequate copper pour and airflow.

Can the TDA2822M drive 4 Ω speakers in stereo mode?

Yes, but only at reduced supply voltages. At 6 V, it delivers 60 mW per channel into 4 Ω with 0.2% THD+N. Driving 4 Ω loads at higher voltages risks exceeding peak output current (1 A) and thermal limits. For full-power 4 Ω operation, use BTL configuration instead, which delivers 2000 mW into 4 Ω at 4.5 V.

Is external compensation required for stability?

No external compensation is needed. The TDA2822M is internally compensated for unity-gain stability across its specified supply and load ranges. The fixed 39 dB gain and integrated feedback ensure stable operation with standard 100 µF output coupling capacitors and typical PCB trace inductance.

How does BTL mode affect power supply current draw?

In BTL mode, quiescent current remains 6–9 mA, but dynamic current scales with output power demand across both channels. Since both amplifiers drive the same load differentially, total supply current is approximately double that of a single channel delivering equivalent power-e.g., 200 mA peak at 1 W output into 8 Ω, versus ~100 mA in stereo mode at 500 mW per channel.