TDA2040 Hi-Fi Audio Power Amplifier: Replacement, Circuit and Datasheet

The TDA2040 is a Pentawatt audio class AB amplifier with a 22W output power (d=0.5 percent) at Vs = 32V/4. The IC generates a large amount of output current while exhibiting very low harmonic and cross-over distortion. The gadget includes a proprietary short circuit safety system that automatically limits the amount of power dissipated and keeps the output transistors' working points within their safe operating range.

TDA2040 Pinout is shown below. The package is called the ‘Pentawatt’ package with 5 output pins.

TDA2040 Pinout

TDA2040 Symbol

TDA2040 Footprint

STMicroelectronics TDA2040H technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics TDA2040H.

TDA2040 Schematic Diagram 

• Ptot - Power Dissipation at Tcase = 75 °C: 25 W

• Tstg, Tj - Storage and Junction Temp. -40 to 150°C

• Wide-range supply voltage, up to 40 V

• Single or split power supply

• Short-circuit protection to ground

• Thermal shutdown

• PO = 25 W @ THD = 0.5%, VS = ±17 V, RL= 4 Ω

• PO = 30 W @ THD =10%, VS = ±17 V, RL = 4 Ω

Circuit Schematic

The schematic for a 25-watt audio amplifier is rather straightforward; the TDA2040 amplifies the signal and delivers 25 watts RMS to a 4-ohm loudspeaker. Decoupling filter capacitors C4 and C5 are utilized. C1 and R1 function as filters. R2, R3, and C2 provide the power amplifier with the appropriate feedback. The snubber circuit (R4 and C3) clamps the feedback from the inductive load (Loud Speaker).

The Power amplifier TDA2040 must be appropriately connected to the heatsink while building the circuit. A larger heatsink will produce better results. Also, for a better outcome, audio-grade rated box-type capacitors are recommended.

TDA2040 Test Circuit

To construct the circuit we need the following components:

• Vero board (dotted or connected anyone can be used)

• Soldering Iron

• Solder wire

• Nipper and Wire stripper tool

• Wires

• Aluminum heat sink

• 17V Rail to Rail power supply with +17V GND -17V power track

• 4 Ohms 25 Watt speaker

•  4.7R Resistor 1/2 Watt

• 680R Resistor 1/4th Watt

• 22k resistor

• 10k resistor

• 100nF / .1uF capacitor 4pcs

• 22uF capacitor

• TDA2040

TDA2040 Package Outline

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