175-W stereo, 350-W mono, 12- to 38-V supply, digital input Class-D Smart Audio Amplifier


Product details


Audio input type Digital Input Architecture Class-D, Smart Amp Speaker channels (Max) Stereo Power stage supply (Max) (V) 38 Power stage supply (Min) (V) 12 Load (Min) (ohms) 1 Output power (W) 175 SNR (dB) 108 THD + N @ 1 kHz (%) 0.01 Iq (Typ) (mA) 12.5 Control interface Hardware Closed/open loop Closed Analog supply (Min) (V) 10.8 Analog supply (Max) (V) 13.2 Sampling rate (Max) (kHz) 96 PSRR (dB) 60 Operating temperature range (C) 0 to 70 open-in-new Find other Speaker amps

Package | Pins | Size

HSSOP (DKQ) 56 191 mm² 18.42 x 10.35 open-in-new Find other Speaker amps


  • Flexible Audio Inputs
    • I2S, TDM, Left-Justified, Right-Justified
    • 32 kHz, 44.1 kHz, 48 kHz, 96 kHz
    • Supports 3-Wire Digital Input (No MCLK)
  • Total Output Power at 10% THD+N
    • 175-W Stereo into 4 Ω in BTL Configuration
    • 220-W Stereo into 3 Ω in BTL Configuration
    • 350-W Mono into 2 Ω in PBTL Configuration
  • Total Output Power at 1% THD+N
    • 140-W Stereo into 4 Ω in BTL Configuration
    • 175-W Stereo into 3 Ω in BTL Configuration
    • 285-W Mono into 2 Ω in PBTL Configuration
  • Advanced Integrated Closed-Loop Design
    • Ultra Low 0.01% THD+N at 1 W Into 4 Ω
    • <0.01% THD+N to Clipping
    • 60 dB PSRR (BTL, No Input Signal)
    • <95 µV Output Noise (A-Weighted)
    • >108 dB SNR (A-Weighted)
  • Fixed-Function Processing Features
    • SmartEQ (Up To 15x BiQuads Per Channel)
    • Crossover EQ (2x 5 BiQuads)
    • 3-Band Advanced DRC + AGL
    • Dynamic EQ and SmartBass
    • Sample Rate Conversion
  • Control Features
    • I2C Software Mode Control
    • Address Select Pin
  • 90% Efficient Class-D Operation (4 Ω)
  • Wide 12-V to 36-V Supply Voltage Operation
  • Integrated Protection with Error Reporting: Undervoltage, Cycle-by-cycle Current Limit, Short Circuit, Clipping detection, Overtemperature Warning and Shutdown and DC Speaker Protection

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TAS3251 is a digital-input, high-performance Class-D audio amplifier that enables true premium sound quality with Class-D efficiency. The digital front-end features a high-performance Burr-Brown™ DAC with integrated DSP for advanced audio processing, including SmartAmp and SmartEQ. The first high-power single-chip solution reduces overall system solution size and cost. The DSP is supported by TI PurePath™ Console Graphical tuning software for quick and easy speaker tuning and control. The Class-D power stage features advanced integrated feedback and proprietary high-speed gate drive error correction for ultra-low distortion and noise across the audio band. The device operates in AD-mode and can drive up to 2 x 175 W into 4 Ω load and 2 x 220 W into 3 Ω load.

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Technical documentation

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Type Title Date
* Data sheet TAS3251 175-W Stereo, 350-W Mono Ultra-HD Digital-Input Class-D Amplifier with Advanced DSP Processing datasheet (Rev. B) May 28, 2020
Technical article How smart amps are bringing high-fidelity audio into the smart home May 03, 2021
Application note TAS3251 process flows (Rev. A) Jan. 22, 2019
User guide TAS3251 Evaluation Module (Rev. B) Jan. 10, 2019

Design & development

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Software development

TAS3251 Software

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PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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Class-D LC Filter Designer
LCFILTER-CALC-TOOL — Calculate and design audio Class-D LC filters in minutes using the Class-D LC Filter Designer.  Select from 4 different filter types based on Class-D output, switching topology and performance.  Input corner frequency and quality (Q) factor to fine tune the audio frequency response.  (...)
  • Calculate LC filter inductor and capacitor values quickly
  • Select from 4 different Class-D filter types
  • Tune frequency response with corner frequency and quality factor (Q) inputs
  • Verify and graph filter response with multiple speaker loads

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HSSOP (DKQ) 56 View options

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