tda7294 ic datasheet

TDA7294 is a monolithic amplifier IC also known as DMOS audio amplification component, it is a high power class AB amplifier type.

TDA7294 amplifier ICs have more applications at high-end stereo amplifier sets, on applications like home amplifier systems and car stereo sets used TDA7294 based circuits.

TDA7294 ICs had high power output up to 100w, and with high current capacity, the TDA7294 system builds with multiple functions and protection systems.



 The TDA7294 DMOS audio amplifier IC had 15 pins on it.

PIN NUMBER Pin name Pin description
Pin1 Standby GND Standby ground
Pin2 Input (-) Inverting input
Pin3 Input (+) Non-inverting input
Pin4 SVR Supply voltage rejection used for noise rejection
Pin5 N.C No connection
Pin6 Bootstrap Bootstrap connection
Pin7 +Vs Positive supply
Pin8 -Vs Negative supply
Pin9 Standby Standby control
Pin10 Mute Mute function pin
Pin11 N.C No connection
Pin12 N.C No connection
Pin13 +Vs Positive power supply
Pin14 Output Output port
Pin 15 -Vs Negative power supply
Tab or case Tab case connected to ground


TDA7294 Package

TDA7294 Package
TDA7294 Package

The package used at TDA7294 IC is the multiwatt15, the 15 is called the number of pins on the amplifier IC.

It is a high power amplifier IC had different circuit connections such as bridge amplifier and stereo amplifier, so they need high power dissipating package.

The TO-220 package is used as the enclosure for power components, the multiwatt15 is an enlarged version of Petawatt. 

The zig-zag inline packaging of multiwatt15 makes it easier to attach it with printed board, the power dissipation is high, a metal case with a hole in it for attaching the heat sink with it.

tda7294 ic datasheet

tda7294 ic datasheet
tda7294 ic datasheet

if you need a datasheet in pdf please click this link

TDA7294 specification

  • Peak voltage range (Vs) is 50v
  • Peak operating voltage range (VS) is ±10v to ±40v
  • Peak current range (ip) is 10A
  • Power dissipation (Pd) is 50W
  • Total Harmonic Distortion (THD) or (d) is 1%
  • Quiescent drain current (Id) is 20 to 65mA
  • Junction temperature range (TJ) is 150°C
  • Voltage gain (dB) is 40dB
  • No boucherot cells
  • Low distortion value
  • Short circuit protection
  • Thermal shutdown protection
  • Output power (PO)
  1. PO = 100w @ d= 10%, Vs= ±38v, RL = 8Ω
  2. Vs= ±33v, RL= 6Ω                  
  3.  Vs= ±29v, RL=4Ω

TDA7294 description

TDA7294 amplifier IC is a power amplification component, which is also called DMOS audio amplifier. The TDA7294 have more applications at higher-end amplifier circuits like TV stereo set, car radio sets and also at the self-powdered loudspeaker.

The maximum allowable voltage at the TDA7294 is 50v.

The operating voltage rating for a TDA7294 amplifier IC is ±10v to ±40v, this is the voltage value we need to set for the power supply.

The maximum current allowable on the TDA7294 is 10A, it is the maximum allowable current on the amplifier IC, the quiescent drain current is called the current consume at the condition when the amplifier is in standby condition, for the TDA7294 it is 20 to 65mA

The total harmonic distortion (THD) value at any amplifier component is dependent on different factors such as frequency, power produced and output load used.

So at a fixed condition, the TDA7294 amplifier IC has a distortion value of 0.1%.

At TDA7294 amplifier IC there are multiple functions and systems for the protections, such as NO switch ON/OFF pop noise, No boucherot cells, low distortion value, low noise value, short protection, and thermal shut down protection.

 TDA7294 IC has a voltage gain value of 40dB and output power offered by a TDA7294 is dependent on different factors such as power supply value, output load, and distortion value.

The TDA7294 amplifier IC has the maximum output power value of 100w at different conditions.

TDA7294 replacement

The replacement for TDA7294 IC will be TDA7293, TDA7295, NTE7165, and LM3886, and the electrical and physical characteristics will be the same.

But on the replacement process, we need to check and verify the differences between TDA7294 with these amplifier ICs.

TDA7294 bridge amplifier

TDA7294 bridge amplifier
TDA7294 bridge amplifier

The figure shows the bridge amplifier circuit using TDA7294 amplifier IC, we can see at circuit very few circuit component are used

Generally, bridge amplifier works with two amplifier systems, at TDA7294 amplifier IC two op-amp are used as amplification components.

When the signal reaches amplifier 1, the audio signal passes through it and starts amplification and at a situation, it passes the signal to the second amplifier 2.

And a combined signal is produced and passes over to the output speaker, and the is the simple operation of a bridge amplifier.

The resistor is used at the input for setting a fixed impedance, resistance, and the capacitor is used to make mute and standby function at the device.

Two resistors are used to set voltage gain and the capacitor is used for the feedback component.

TDA7294 Power supply 

TDA7294 Power supply
TDA7294 Power supply

 The operating voltage value for the TDA7294 is ±10v to 40v, so a 25v/ 3.5amp 25v AC transformer is perfect for the amplifier power supply, and we need a bridge rectifier IC and a filter section.

At the power supply output, 50v is needed for the TDA7294 based amplifier power supply section.

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