Short Description

The Texas Instruments TPA3255 is a high-performance Class-D Audio Power Amplifier IC designed for building powerful, efficient and high-fidelity audio amplifiers.

With support for output configurations of up to 2 × 315W @ 4Ω or 1 × 600W @ 2Ω, the TPA3255 is an excellent choice for DIY Hi-Fi amplifiers, active speakers, subwoofer amplifiers, Bluetooth amplifiers, home audio systems and professional audio projects.

This listing is for the TPA3255 IC chip only. PCB, components, heatsink and amplifier board are not included.

Product Overview

Texas Instruments TPA3255 is one of TI's popular high-performance Class-D audio amplifier ICs, designed for applications requiring high output power, excellent efficiency and low distortion.

The TPA3255 incorporates Texas Instruments' PurePath™ Ultra-HD technology and is designed to provide high-quality audio reproduction when implemented with an appropriate PCB layout, power supply, output filter and thermal management system.

It is particularly suitable for experienced electronics builders and manufacturers developing:

• DIY Hi-Fi amplifiers
• Stereo power amplifiers
• Subwoofer amplifiers
• Active speaker systems
• Bluetooth audio amplifiers
• Home audio systems
• 2.0 / 2.1 audio systems
• Professional audio equipment
• Custom amplifier projects

???? High-Power Class-D Amplification

The TPA3255 is designed to deliver high output power while maintaining the efficiency advantages of Class-D amplification.

Depending on the operating voltage, load impedance, PCB implementation and thermal design, the IC can support high-power output configurations.

Typical Maximum Output Capability

• Up to 2 × 315W @ 4Ω
• Up to 1 × 600W @ 2Ω
• Up to 2 × 150W @ 8Ω

Actual achievable output power depends heavily on the complete amplifier design.

⚡ High-Efficiency Class-D Design

Class-D amplification allows high power output with comparatively low power loss.

The TPA3255 is designed for high efficiency, potentially exceeding 90% under suitable operating conditions, helping reduce heat generation compared with many conventional linear amplifier designs.

However, appropriate thermal management is still required for high-power applications.

???? PurePath™ Ultra-HD Technology

The TPA3255 incorporates PurePath™ Ultra-HD technology from Texas Instruments.

When implemented correctly, the technology helps designers achieve:

• Low distortion
• Low noise
• High-quality audio reproduction
• Detailed sound
• Strong dynamic performance
• High-fidelity amplification

Final audio performance depends on the complete amplifier implementation rather than the IC alone.

???? Wide Supply Voltage Range

The TPA3255 supports a DC supply voltage range of approximately:

18V – 53.5V DC

For many high-power applications, a supply in the 36V–48V DC range is commonly suitable, provided it remains within the IC's specifications and is matched to the intended speaker load and amplifier design.

The required power supply current depends on the desired output power and speaker impedance.

???? High-Power Speaker Applications

The TPA3255 can be used in amplifier designs intended for:

Stereo

2 × channel output

Suitable for left/right stereo speaker systems.

Mono / Subwoofer

The IC can also be incorporated into suitable high-power mono/BTL amplifier designs depending on the PCB topology and implementation.

This makes it suitable for custom subwoofer amplifier projects as well as stereo Hi-Fi designs.

????️ Protection Features

The TPA3255 incorporates protection functions designed to help protect the amplifier IC under abnormal operating conditions.

Depending on the implementation, protection includes:

• Over-temperature protection
• Over-current protection
• Under-voltage protection
• Short-circuit protection
• Fault monitoring

The exact protection behavior depends on the IC configuration and complete PCB design.

????‍???? Designed for DIY & Professional Electronics Projects

The TPA3255 is particularly suitable for users who have experience with SMD PCB assembly, audio amplifier design and power electronics.

It can be used as the core amplifier IC in a custom PCB together with the appropriate:

• Input circuitry
• Output filter
• Gate-drive/power components
• Decoupling capacitors
• Power supply
• Protection circuitry
• Heat dissipation system
• PCB layout

A properly designed PCB is essential for achieving the expected performance.

???? Recommended Applications

The TPA3255 can be used for:

• DIY Audio Amplifiers
• Hi-Fi Stereo Amplifiers
• Home Theater Amplifiers
• Active Speakers
• Professional Audio Amplifiers
• Subwoofer Amplifiers
• Bluetooth Amplifiers
• 2.0 Audio Systems
• 2.1 Audio Systems
• Custom Class-D Amplifiers
• Studio Audio Projects
• High-Power Speaker Systems
• Custom Electronics Projects

⚙️ Technical Specifications

???? Output Power Depends on Complete Design

The advertised output power should not be interpreted as guaranteed output from the IC under every configuration.

Actual amplifier output depends on:

• Supply voltage
• Power supply current capability
• Speaker impedance
• PCB layout
• Output filter
• Heat dissipation
• Switching components
• Input signal
• Distortion target
• Overall amplifier topology

For example, achieving very high output power requires an appropriately designed power supply and PCB capable of handling the required current and thermal load.

???? Cooling & Thermal Management

Although Class-D amplification is highly efficient, high-power operation can still generate significant heat.

For high-output amplifier designs, appropriate thermal management should be considered, including:

• Proper heatsinking
• Thermal interface design
• Adequate PCB copper area
• Airflow where required
• Correct installation of thermal components

The final cooling requirement depends on the actual operating conditions and amplifier design.

⚠️ Important Product Note

This product is the TPA3255 IC chip only.

The following items are NOT included:

• Amplifier PCB
• Amplifier board
• Power supply
• Heatsink
• Capacitors
• Inductors
• Resistors
• Connectors
• Speaker terminals
• Enclosure
• Cables

The buyer is responsible for designing or providing the complete amplifier circuit.

???? SMD Installation Requirement

The TPA3255 is supplied as a surface-mount IC and requires appropriate SMD soldering equipment and PCB assembly skills.

Installation should be performed by someone experienced in:

• SMD soldering
• PCB assembly
• Class-D amplifier circuits
• Power electronics
• Thermal management

Incorrect installation, PCB layout or power supply design can damage the IC.

???? Key Features

• Genuine Texas Instruments TPA3255 IC
• High-performance Class-D audio amplifier
• PurePath™ Ultra-HD technology
• Up to 2 × 315W @ 4Ω
• Up to 1 × 600W @ 2Ω
• Up to 2 × 150W @ 8Ω
• 18V–53.5V DC operating range
• Recommended 36V–48V supply range
• High efficiency
• Low distortion design capability
• High signal-to-noise performance
• Integrated protection functions
• Suitable for stereo and high-power audio designs
• Ideal for DIY and professional amplifier development
• HTSSOP SMD package

???? Package Includes

1 × Texas Instruments TPA3255 Audio Power Amplifier IC

Not Included

PCB, amplifier board, heatsink, power supply, passive components and other accessories are not included.

⚠️ Important Notes

• This is an IC chip only, not a complete amplifier.
• A suitable PCB design is required.
• Use a power supply within the specified voltage range.
• Actual output power depends on supply voltage, current capacity, speaker impedance and PCB design.
• Proper output filtering is required.
• Appropriate thermal management is required for high-power operation.
• SMD soldering/PCB assembly experience is recommended.
• Incorrect wiring, excessive voltage or poor PCB implementation may damage the IC.
• Always follow the manufacturer's recommended design and operating conditions.

???? Website Product Summary

Texas Instruments TPA3255 is a high-performance Class-D Audio Power Amplifier IC designed for powerful and efficient Hi-Fi audio amplifier applications. It supports output configurations of up to 2 × 315W @ 4Ω or 1 × 600W @ 2Ω, with a supply range of 18V–53.5V DC and recommended operation around 36V–48V DC. Featuring PurePath™ Ultra-HD technology, high efficiency and integrated protection functions, it is ideal for DIY Hi-Fi amplifiers, active speakers, subwoofer amplifiers, Bluetooth amplifiers and professional audio projects.

Chip only — PCB, components, heatsink and amplifier board are not included.