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TPA3251

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

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Data sheet

TPA3251

ACTIVE
Data sheet Order now

Product details

Audio input type Analog Input Architecture Class-D Speaker channels (max) 4 Control interface Hardware Output power (W) 175 Power stage supply (max) (V) 36 Power stage supply (min) (V) 12 RDS(on) (Ω) 0.06 THD + N at 1 kHz (%) 0.005 Load (min) (Ω) 1.5 Analog supply voltage (min) (V) 10.8 Analog supply voltage (max) (V) 13.2 Rating Catalog Operating temperature range (°C) 0 to 70
Audio input type Analog Input Architecture Class-D Speaker channels (max) 4 Control interface Hardware Output power (W) 175 Power stage supply (max) (V) 36 Power stage supply (min) (V) 12 RDS(on) (Ω) 0.06 THD + N at 1 kHz (%) 0.005 Load (min) (Ω) 1.5 Analog supply voltage (min) (V) 10.8 Analog supply voltage (max) (V) 13.2 Rating Catalog Operating temperature range (°C) 0 to 70
HTSSOP (DDV) 44 113.4 mm² 14 x 8.1
  • Differential Analog Inputs
  • 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 Feedback Design with High-
    speed Gate Driver Error Correction
    (PurePath Ultra-HD)
    • Signal Bandwidth up to 100 kHz for High
      Frequency Content From HD Sources
    • Ultra Low 0.005% THD+N at 1 W into 4 Ω and
      <0.01% THD+N to Clipping
    • 60 dB PSRR (BTL, No Input Signal)
    • <60 µV (A-Weighted) Output Noise
    • >111 dB (A Weighted) SNR
  • Multiple Configurations Possible:
    • Stereo, Mono, 2.1 and 4xSE
  • Click and Pop Free Startup and Stop
  • 90% Efficient Class-D Operation (4 Ω)
  • Wide 12-V to 36-V Supply Voltage Operation
  • Self-Protection Design (Including Undervoltage,
    Overtemperature, Clipping, and Short Circuit
    Protection) With Error Reporting
  • EMI Compliant When Used With Recommended
    System Design
  • Differential Analog Inputs
  • 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 Feedback Design with High-
    speed Gate Driver Error Correction
    (PurePath Ultra-HD)
    • Signal Bandwidth up to 100 kHz for High
      Frequency Content From HD Sources
    • Ultra Low 0.005% THD+N at 1 W into 4 Ω and
      <0.01% THD+N to Clipping
    • 60 dB PSRR (BTL, No Input Signal)
    • <60 µV (A-Weighted) Output Noise
    • >111 dB (A Weighted) SNR
  • Multiple Configurations Possible:
    • Stereo, Mono, 2.1 and 4xSE
  • Click and Pop Free Startup and Stop
  • 90% Efficient Class-D Operation (4 Ω)
  • Wide 12-V to 36-V Supply Voltage Operation
  • Self-Protection Design (Including Undervoltage,
    Overtemperature, Clipping, and Short Circuit
    Protection) With Error Reporting
  • EMI Compliant When Used With Recommended
    System Design

TPA3251 is a high performance class-D power amplifier that enables true premium sound quality with class-D efficiency. It features an advanced integrated feedback design and proprietary high-speed gate driver error correction (PurePath™ Ultra-HD). This technology allows ultra low distortion across the audio band and superior audio quality. The device can drive up to 2 x 175 W into 4-Ω load and 2 x 220 W into 3-Ω load and features a 2 VRMS analog input interface that works seamlessly with high performance DACs such as TI’s PCM5242. In addition to excellent audio performance, TPA3251 achieves both high power efficiency and very low power stage idle losses below 1 W. This is achieved through the use of 60 mΩ MOSFETs and an optimized gate driver scheme that achieves significantly lower idle losses than typical discrete implementations.

TPA3251 is a high performance class-D power amplifier that enables true premium sound quality with class-D efficiency. It features an advanced integrated feedback design and proprietary high-speed gate driver error correction (PurePath™ Ultra-HD). This technology allows ultra low distortion across the audio band and superior audio quality. The device can drive up to 2 x 175 W into 4-Ω load and 2 x 220 W into 3-Ω load and features a 2 VRMS analog input interface that works seamlessly with high performance DACs such as TI’s PCM5242. In addition to excellent audio performance, TPA3251 achieves both high power efficiency and very low power stage idle losses below 1 W. This is achieved through the use of 60 mΩ MOSFETs and an optimized gate driver scheme that achieves significantly lower idle losses than typical discrete implementations.
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Technical documentation

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Type Title Date
* Data sheet TPA3251 175-W Stereo, 350-W Mono PurePath™ Ultra-HD Analog-Input Class-D Amplifier datasheet (Rev. D) PDF | HTML 20 Apr 2016
Application note Class-D Amplifier External Load Diagnostics (Rev. A) PDF | HTML 17 Jul 2025
Application note TPA324x and TPA325x Post-Filter Feedback (Rev. A) 07 Mar 2018
More literature High-Power Audio Amplifiers TPA322x/4x/5x 01 Dec 2017
User guide TPA3251 Evaluation Module User's Guide 02 Nov 2017
Application note Multi-Device Configuration for TPA32xx Amplifiers 27 Sep 2017
Technical article Get loud with a 700W automotive audio amplifier for infotainment systems PDF | HTML 15 Jun 2017
Technical article Professional audio equipment made the most noise at the 2017 NAMM Show PDF | HTML 14 Mar 2017
More literature TI Automotive External Amplifiers (Rev. A) 03 Feb 2017
More literature TI Powered Speakers (Rev. A) 31 Jan 2017
Application note LC Filter Design (Rev. A) 09 Nov 2016
Application note TPA32xx Analog Input Grounding for Single Ended Inputs PDF | HTML 26 Aug 2016
More literature High-Power Audio Amplifiers 14 Jul 2016
Technical article How to select an audio amplifier for products with internal or external speakers PDF | HTML 29 Feb 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

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Not available on TI.com
Evaluation board

SIDEGIG-PROTOEVM — Prototype Audio Plug-in Module

The TI Prototype Audio Plug-in Module turns TI Audio Class-D amplifier EVM’s into your sandbox. Need to prototype a pre-amplifier circuit or test an opamp with TI Class-D EVMs, then start with the DIY Audio Plug-in Module.

Start your prototype on the included breadboard or solder directly to the (...)
User guide: PDF
Not available on TI.com
Evaluation board

SIDEGIG-XOVEREVM — Analog, Active Crossover Audio Plug-in Module

The TI Analog, Active Crossover Audio Plug-in Module turns TI Audio Class-D amplifier EVM’s into a high quality, two-way speaker amplifier.  The plug-in module makes it easy to remove the large and expensive passive crossover found in passive loudspeakers and create a biamped, two-way (...)
User guide: PDF
Not available on TI.com
Evaluation board

TPA3251EVM — TPA3251 175W Stereo / 350W Mono Ultra-HD, Analog-In Class-D Module

The TPA3251EVM Ultra-HD evaluation module demonstrates the TPA3251 integrated circuit from Texas Instruments. The TPA3251 is a high-performance Class-D amplifier that enables true premium sound quality with high efficiency Class-D technology. It features an advanced integrated feedback design and (...)

User guide: PDF
Not available on TI.com
Design tool

SLAC732 — TPA3251 Setup Guide & Configuration Tool

Supported products & hardware

Supported products & hardware

Products
Speaker, TV & soundbar audio amplifiers
  • TPA3251 — 175-W stereo, 350-W mono, 12- to 38-V supply, analog input Class-D Smart Audio Amplifier
Hardware development
Evaluation board
  • TPA3251EVM — TPA3251 175W Stereo / 350W Mono Ultra-HD, Analog-In Class-D Module
Download
Design tool

SLAC736 — TPA3251 Inductor Study

Supported products & hardware

Supported products & hardware

Products
Speaker, TV & soundbar audio amplifiers
  • TPA3251 — 175-W stereo, 350-W mono, 12- to 38-V supply, analog input Class-D Smart Audio Amplifier
Software
Design tool
Download
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Reference designs

TIDA-00874 — High Fidelity 175-W Class-D Audio Amplifier with Digital Inputs and Processing Reference Design

This design turns the extremely high performance analog input TPA3251 Class-D amplifier into a digital input system with audio processing using the highly versatile PCM5242 differential output DAC. Now the full performance of TPA3251 amplifier can be realized with a variety of digital input (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP11769 — 700-W Automotive External Audio Amplifier Reference Design

This reference design contains a boost converter that provides 36.0-V @ 10.0-A continuous / 20.0-A peak from an input voltage of 9 to 16 V. It contains two premium Class-D audio amplifiers which provide 2x 175-W @ 4-Ω load (left and right channel) and 1x 350-W @ 2-Ω (subwoofer). (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10215 — Universal Input to 3.3V, 12V, 36V, 200W Continuous PSU for Class-D Amplifier Reference Design

This power module generates all voltages to supply a class-D audio amplifier. The main output voltage is 36V and delivers 200W continuously and 840W peak. The first stage is a power-factor corrected Boost. A Flyback converter supplies 12V on primary side as well as 12V@300mA and 3.3V@200mA on (...)
Test report: PDF
Schematic: PDF
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HTSSOP (DDV) 44 Ultra Librarian
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