TDA7294 is a popular audio amplifier integrated circuit (IC) that has gained significant popularity in the audio industry due to its excellent performance and low cost. The IC is widely used in various audio applications, including home theater systems, car audio systems, and professional audio equipment.
In this article, we will take a closer look at the TDA7294 audio amplifier, including its pinout, datasheet, and equivalent components.
TDA7294 is a class AB monolithic audio amplifier integrated circuit launched by STMicroelectronics (SGS-THOMSON Microelectronics) in the 1990s, which is one of the best-performing and most powerful monolithic audio amplifiers, designed according to the classical circuit of discrete component class A and B audio amplifiers.
Its pre-stage adopts low noise, low distortion bipolar transistor circuit, and the final stage adopts high withstand voltage, high current DMOS tube buffer output, so it has the advantages of pure tone of bipolar circuit, and the characteristics of high voltage and high current drive output of field effect tube.
The chip is designed with high voltage resistance, low noise, low distortion, playback tone is very affinity and other characteristics; and has a silent standby function, short-circuit current and overheating protection function to make its performance more perfect
Download TDA7294.pdf here.
Product Model:TDA7294
Brand name: STMicroelectronics
Type: Class AB
Output type: 1 channel (mono)
Maximum output power x channel @ load: 100W x 1 @ 8Ohm
Voltage - Power Supply: ±10V~40V
Features: Depop, Mute, Short circuit and thermal protection, Standby
Mounting Type: Through Hole
Operating Temperature: 0℃~70℃(TA)
Supplier equipment package: 15 - several watts
Package/Case: Multiwatt-15 (Horizontal, Bend and Staggered Leads)
Base part number: TDA7294
Maximum VS supply voltage (no signal): ±50 V
Maximum IO output peak current: 10 A
Maximum operating ambient temperature range: 0 to 70°C
Maximum Tstg, Tj storage and junction temperature: 150°C
VS supply range: ±10 V minimum, ±40 V maximum
Open-loop voltage gain: 80 dB
Closed-loop voltage gain: 24 dB minimum, 30 dB typical, 40 dB maximum
Ib input bias current: 500 nA
Lead-free/RoHS status: Lead-free/RoHS compliant
Moisture sensitivity level (MSL): 1 (no limit)
Extremely high operating voltage range of ±40V
DMOS power stage
High output power (up to 100W music power)
Mute/standby function
No switch on/off noise
No Boucherot cells
Extremely low distortion
Extremely low noise
Short circuit protection
Thermal shutdown
The TDA7294 is used as a high-quality audio amplifier in a wide range of applications, including:
1. Hi-Fi systems: It is widely used in high-end audio amplifiers for home and professional audio systems, where high fidelity sound reproduction is required.
2. Home theaters: It is used to power the speakers in surround sound systems, providing clear and powerful audio for movies, music, and other multimedia content.
3. Car audio systems: It can be used in car audio amplifiers, providing high-quality sound for car stereos and other audio systems.
4. Musical instruments: It can be used to amplify the sound of musical instruments such as guitars, keyboards, and drums, providing clear and powerful sound.
5. PA systems: It can be used in public address systems, providing clear and powerful sound for announcements, speeches, and other events.
The TDA7294 audio amplifier requires a dual power supply voltage of +/- 25 volts DC to +/- 50 volts DC to operate correctly. The power supply should be capable of delivering the required current to the amplifier to provide the desired output power.
There are several equivalents to the TDA7294 audio amplifier IC that can be used in audio amplifier circuits. Some of the most common equivalents are:
TDA7293: This IC is very similar to the TDA7294 and has the same pin configuration, but it is slightly less powerful, delivering up to 80 watts into an 8-ohm load.
LM3886: This is a high-performance audio amplifier IC developed by Texas Instruments. It can deliver up to 68 watts of power into an 8-ohm load and has a very low distortion and high signal-to-noise ratio.
TPA3116D2: This is a class-D audio amplifier IC that can deliver up to 100 watts of power into a 2-ohm load. It is highly efficient and has a low distortion and high signal-to-noise ratio.
TDA2050: This is a popular audio amplifier IC that can deliver up to 32 watts of power into an 8-ohm load. It is widely used in low-power audio amplifier circuits.
NJW0302/NJW0281: These are complementary NPN and PNP bipolar transistors that can be used in a power amplifier circuit as an alternative to the TDA7294 IC.
The TDA7293 and TDA7294 are very similar audio amplifier ICs produced by STMicroelectronics. They are both capable of delivering high-quality audio with low distortion and high efficiency, and they share many of the same features, such as built-in protection circuits and a wide frequency response range.
Here is a summary of the main differences between them,
TDA7293 | TDA7294 |
• Multipower BCD technology | • Very High Operating Voltage Range (±40V) |
Choosing between the TDA7294 and TDA7293 audio amplifier ICs will depend on the specific requirements of your audio amplifier design. Here are some factors to consider:
Power Requirements: The TDA7294 has a higher maximum output power rating of 100 watts, while the TDA7293 has a maximum output power of 80 watts. If your audio amplifier design requires higher power output, the TDA7294 may be the better choice.
Load Impedance: The TDA7294 is recommended for use with a minimum load impedance of 4 ohms, while the TDA7293 is recommended for a minimum load impedance of 6 ohms. If your audio amplifier design requires a lower load impedance, the TDA7294 may be the better choice.
Supply Voltage Range: The TDA7294 requires a slightly higher minimum supply voltage of +/- 25 volts DC, compared to the TDA7293's minimum of +/- 20 volts DC. If your power supply can provide the higher voltage required by the TDA7294, it may be a better choice for your design.
Package Type: The TDA7294 is available in a Multiwatt15 package, while the TDA7293 is available in a Multiwatt11 package. If your amplifier design requires a specific package type, this may influence your choice.
Cost: The TDA7293 is typically less expensive than the TDA7294. If cost is a significant factor in your design, the TDA7293 may be a better choice.
Ultimately, the choice between the TDA7294 and TDA7293 will depend on your specific design requirements, and it may be helpful to consult the datasheets and compare the specifications to make an informed decision.
| TDA7294 | LM3886 | |
| Maximum Output Power | 100 watts | 68 watts |
| Minimum Load Impedance | 4 ohms | 8 ohms |
| Supply Voltage Range | +/- 25 volts DC to +/- 40 volts DC | +/- 20 volts DC to +/- 65 volts DC |
| Input Sensitivity | 1.22 volts RMS | 1.2 volts RMS |
| Total Harmonic Distortion (THD) | 0.1% at 20 watts | 0.03% at 1 watt |
| Signal-to-Noise Ratio (SNR) | 100 dB | 92 dB |
| Number of Channels | Single | Single |
| Package Type | Multiwatt15 | TO-220 |
| Thermal Shutdown Protection | Yes | Yes |
| Cost | more expensive than LM3886 |
Choosing between the TDA7294 and LM3886 audio amplifier ICs will depend on your specific requirements for your audio amplifier design. Here are some factors to consider:
Power Requirements: The TDA7294 has a higher maximum output power rating of 100 watts, while the LM3886 has a maximum output power of 68 watts. If your audio amplifier design requires higher power output, the TDA7294 may be the better choice.
Load Impedance: The TDA7294 is recommended for use with a minimum load impedance of 4 ohms, while the LM3886 is recommended for use with a minimum load impedance of 8 ohms. If your audio amplifier design requires a lower load impedance, the TDA7294 may be the better choice.
Supply Voltage Range: The TDA7294 requires a slightly higher minimum supply voltage of +/- 25 volts DC, compared to the LM3886's minimum of +/- 20 volts DC. If your power supply can provide the higher voltage required by the TDA7294, it may be a better choice for your design.
Circuit Complexity: The LM3886 requires fewer external components compared to the TDA7294, making it easier to use in some amplifier designs.
Distortion: The LM3886 has lower distortion levels compared to the TDA7294, which can make it a better choice for high-fidelity audio applications.
Package Type: The TDA7294 is available in a Multiwatt15 package, while the LM3886 is available in a TO-220 package. If your amplifier design requires a specific package type, this may influence your choice.
Cost: The LM3886 is typically less expensive than the TDA7294. If cost is a significant factor in your design, the LM3886 may be a better choice.
In conclusion, the TDA7294 audio amplifier is a versatile and reliable IC that has become a popular choice for audio enthusiasts and professionals alike. Its high-performance class AB amplifier design, coupled with its ease of use and low cost, make it an ideal choice for a wide range of audio applications.
By understanding its pinout, datasheet, and equivalent components, users can effectively harness the full potential of this powerful amplifier IC. With its exceptional performance, the TDA7294 is sure to continue its reign as one of the most popular audio amplifier ICs in the industry for many years to come.
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