STMicroelectronics TDA7498E

Product Summary TDA7498E Dual BTL Class-D Audio Amplifier

The TDA7498E from STMicroelectronics is a high-performance dual BTL (Bridge-Tied Load) class-D audio amplifier tailored for demanding home audio systems and active speaker applications. This IC delivers considerable output power while maintaining excellent efficiency and compact integration. Housed in a 36-pin PowerSSO package with an exposed thermal pad, the TDA7498E is optimized for straightforward heatsink attachment, simplifying thermal management in high-power amplifier designs.

Main Features of the TDA7498E

Designed for flexibility and robust audio output, the TDA7498E provides:

Up to 160 W + 160 W output power in dual channel stereo mode (10% THD, RL = 4 Ω, VCC = 36 V)

Single channel mono parallel BTL operation delivering up to 220 W (10% THD, RL = 3 Ω, VCC = 36 V)

Wide single-supply voltage operation between 14 V and 36 V

High efficiency, with typical values reaching 85%

Four selectable, fixed gain settings (23.8 dB, 29.8 dB, 33.3 dB, 35.8 dB)

Differential input configuration for enhanced noise immunity

Integrated standby and mute features

Advanced smart protection, including thermal overload and overcurrent protection

Output DC offset typically less than 20 mV

These attributes make the TDA7498E suitable for modern, space-conscious designs requiring both sonic quality and high output power.

Internal Structure and Functional Modules of the TDA7498E

At its core, the TDA7498E incorporates two identical power amplifier channels, each implemented using class-D topology for optimal efficiency and thermal performance. Key internal blocks include a modulator, output stage, differential input buffer, gain selection network, and protection logic. The MODE pin provides hardware-level selection between stereo and parallel BTL mono operation, allowing rapid product adaptation to various loudspeaker configurations. With its internal protection circuits, the TDA7498E detects and responds to fault conditions—such as output overcurrent or excessive device temperature—by temporarily disabling the output stage and resuming normal operation once safe conditions are restored.

TDA7498E Pin Layout and External Interface Parameters

The 36-pin PowerSSO package of the TDA7498E features dedicated outputs for stereo channels, differential audio inputs, gain selection pins, and MODE configuration. Careful consideration in PCB layout is advised to minimize crosstalk and ensure optimal heat dissipation. The pinout includes a logic-level MODE pin for selecting between stereo and mono BTL configurations and a GAIN pin with four preset gain options to simplify system-level adjustment. Additionally, various power supply and ground pins provide flexibility in power routing, while standby and mute functionality can be leveraged directly from the system’s microcontroller or hardware switches.

Electrical Characteristics and Working Properties

The TDA7498E is rated for operation with supply voltages from 14 V to 36 V, supporting common audio equipment power rails. Under typical operating conditions (VCC = 36 V, RL = 4 Ω, 1 kHz input), the stereo channels can each deliver 160 W with a total harmonic distortion of 10%. When operated in mono BTL parallel mode with a 3 Ω load, output power reaches 220 W. The gain can be adjusted through the GAIN pin to one of four factory-set values. The low output offset ensures minimized DC component at the speaker terminals, protecting connected transducers. Integrated protection limits output current to prevent device and load damage.

Performance Evaluation TDA7498E Characterization Graphs

The TDA7498E performance is defined by a set of key graphs and curves:

Output power varies with supply voltage, indicating suitability for a wide range of power supply sources.

Total Harmonic Distortion (THD) as a function of output power and frequency highlights clean amplification across typical audio bandwidths.

Fast Fourier Transform (FFT) analysis demonstrates low output noise and harmonic content at nominal operating points.

Crosstalk measurements confirm channel separation, critical for stereo fidelity.

These curves emphasize the TDA7498E’s capability to deliver high output power without sacrificing audio quality.

TDA7498E Application Examples and Usage Guidelines

The TDA7498E serves a broad spectrum of applications, ranging from compact, high-powered integrated speaker solutions to modular amplifier boards for home entertainment centers. In stereo mode, it is suited for bi-amplified speaker cabinets or multi-zone audio systems, while mono BTL mode allows it to drive powerful subwoofer units or single-channel public address installations. When deploying the TDA7498E, engineers should pay special attention to:

Adequate thermal management using the PowerSSO package’s exposed pad, attached to a suitable heatsink

PCB layout for minimal stray capacitance/inductance, especially for high-current output paths

Gain setting selection matching upstream signal source levels

Proper handling and filtering of power supply lines to reduce ripple and ensure stable operation

Details of the TDA7498E PowerSSO-36 EPU Package

The TDA7498E is available in a PowerSSO-36 EPU (Exposed Pad Up) package. This surface-mount package has 36 leads and a large exposed pad specifically designed to maximize heat transfer to the system heatsink or PCB copper plane. Compact dimensions permit dense board layouts, while the exposed pad enables thermal resistance optimization—critical when the device is delivering maximum output power. The package has been developed with environmental compliance in mind, adhering to ECOPACK® specifications.

Alternative or Replacement Options for the TDA7498E

When selecting an audio amplifier for high-output applications, direct replacements or functional equivalents for the TDA7498E may be considered to address supply chain concerns or alternate feature sets. Popular alternatives in the market include:

STMicroelectronics TDA7498 (non-E variant, offering similar functionality but different package or feature configuration)

Texas Instruments TPA3116D2 (class-D stereo amplifier with similar output range but different gain and package options)

Infineon MA12070P (another high-efficiency class-D amplifier, with different control features and protection circuitry)

Engineers should evaluate device-specific parameters including package compatibility, gain settings, protection features, and output power ratings before selecting replacements.

Conclusion

The TDA7498E from STMicroelectronics stands out as a flexible, high-efficiency solution for both stereo and mono high-power audio applications. With robust protection features, flexible gain and mode selection, and a thermally optimized package, it provides a ready-to-integrate platform for demanding home audio and active speaker designs. Its versatility, strong electrical characteristics, and industry-standard power package make it a wise choice for product selection engineers and procurement specialists seeking reliable, scalable audio output solutions.