75-W 2.1-MHz Digital Input 4-Channel Automotive Class-D Audio Amplifier



The TAS6424-Q1 device is a Four-channel digital-input Class-D audio amplifier that implements a 2.1 MHz PWM switching frequency that enables a cost-optimized solution in a very small PCB size, full operation down to 4.5 V for start/stop events, and exceptional sound quality with up to 40 kHz audio bandwidth

The TAS6424-Q1 Class-D audio amplifier is designed for use in automotive head units and external amplifier modules. The device provides four channels at 27 W into 4 Ω at 10% THD+N and 45 W into 2 Ω at 10% THD+N from a 14.4-V supply and 75 W into 4 Ω at 10% THD+N from a 25-V supply. The Class-D topology dramatically improves efficiency over traditional linear amplifier solutions. The output switching frequency can be set either above the AM band, which eliminates the AM-band interference and reduces output filter size and cost, or below AM band to optimize efficiency.

For a pin compatible two-channel amplifier, see the TAS6422-Q1

The device is offered in a 56-pin HSSOP PowerPAD™ package with the exposed thermal pad up.


  • Advanced Load Diagnostics
    • Runs without Input Clocks
    • AC Diagnostic for Tweeter Detection with Impedance and Phase Response
  • Easy to meet CISPR25-L5 EMC Specification
  • Qualified for Automotive Applications
  • Audio Inputs
    • 4 Channel I2S or 4/8-Channel TDM Input
    • Input Sample Rates: 44.1 kHz, 48 kHz, 96 kHz
    • Input Formats: 16-bit to 32-bit I2S, and TDM
  • Audio Outputs
    • Four-Channel Bridge-Tied Load (BTL), With Option of Parallel BTL (PBTL)
    • Up to 2.1-MHz Output Switching Frequency
    • 75 W, 10% THD Into 4 Ω at 25 V
    • 45 W, 10% THD Into 2 Ω at 14.4 V
    • 150 W, 10% THD Into 2 Ω at 25 V PBTL
  • Audio Performance Into 4 Ω at 14.4 V
    • THD+N < 0.03% at 1 W
    • 42-µVRMS Output Noise
    • –90-dB Crosstalk
  • Load Diagnostics
    • Output Open and Shorted Load
    • Output-to-Battery or Ground Shorts
    • Line Output Detection Up to 6 kΩ
    • Host-Independent Operation
    • Programmability for Flexible Production Line Testing
  • Protection
    • Output Current Limiting
    • Output Short Protection
    • 40-V Load Dump
    • Open Ground and Power Tolerant
    • DC Offset
    • Overtemperature
    • Undervoltage and Overvoltage
  • General Operation
    • 4.5-V to 26.4-V Supply voltage
    • I2C Control With 4 Address Options
    • Clip Detection and Thermal Warning

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Parametrics Compare all products in Digital I2S Input Class-D

Speaker Channels (Max)
Power to Bridge Tied Load (Max) (W)
Power to Parallel Bridge Tied Load (Max) (W)
Supported Bridge Tied Load (Min) (Ohms)
Closed/Open Loop
Control Interface
Analog Supply (V) (Min)
Analog Supply (V) (Max)
Power Stage Supply (Max) (V)
Audio Input Type
Sampling Rate (Max) (kHz)
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
TAS6424-Q1 TAS6422-Q1 TAS6424L-Q1
4    2    4   
75    75    27   
150    150    70   
2    2    2   
Closed    Closed    Closed   
I2C    I2C    I2C   
4.5    4.5    4.5   
26.4    26.4    18.0   
26.4    26.4    18.0   
Digital    Digital    Digital   
96    96    96   
-40 to 125    -40 to 125    -40 to 125   
Automotive    Automotive    Automotive   
56HSSOP: 191 mm2: 10.35 x 18.42(HSSOP)    56HSSOP: 191 mm2: 10.35 x 18.42(HSSOP)    56HSSOP: 191 mm2: 10.35 x 18.42(HSSOP)