TAS6421-Q1 75-W, 2-MHz digital input 1-channel automotive Class-D Burr-Brown audio amplifier | TI.com

TAS6421-Q1 (PREVIEW) 75-W, 2-MHz digital input 1-channel automotive Class-D Burr-Brown audio amplifier


More Information and Sample Availability

Full data sheet and other information are available. Request now

Prototype samples are available (PTAS6421QDKQRQ1). Request Now

Recommended alternative devices

For a pin-to-pin compatible 4-channel alternative, see TAS6424-Q1.

For a pin-to-pin compatible 2-channel alternative, see TAS6422-Q1.


TAS6421-Q1 device is a mono-channel digital-input Class-D audio amplifier that implements a 2.1 MHz PWM switching frequency enabling a cost-optimized solution for 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 TAS6421-Q1 is footprint and pin-compatible with TAS642x-Q1 family devices to allow for the flexibility to easily support multiple system configurations with minimal redesign effort.

The output switching frequency can be set either above the AM band, which eliminates AM-band interferences and reduces output filtering and cost, or below the AM band to optimize efficiency.

The device has a built-in load diagnostic function for detecting and diagnosing misconnected outputs as well as detection of AC-coupled tweeters to help to reduce test time during the manufacturing process.

The TAS6421-Q1 mono-channel Class-D audio amplifier is designed for use in automotive audio applications. The device provides one channel at 27 W into 4 Ω at 10% THD+N, 45 W into 2 Ω at 10% THD+N from a 14.4 V supply or 75 W into 4 Ω at 10% THD+N from a 25 V supply.

For pin compatible two- and four-channel devices see the TAS6422-Q1, TAS6424L-Q1, TAS6424M-Q1 and TAS6424-Q1.


  • AEC-Q100 Qualified for automotive applications
    • Temperature grade: –40°C to +125°C
  • Advanced load diagnostics
    • DC Diagnostics run without input clocks
    • AC Diagnostic for tweeter detection with impedance and phase response
  • Easily meet CISPR25-L5 EMC specification
  • Audio inputs
    • 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
    • Single-channel bridge-tied load (BTL)
    • Up to 2.1 MHz output switching frequency
    • 27 W, 10% THD Into 4 Ω at 14.4 V BTL
    • 45 W, 10% THD Into 2 Ω at 14.4 V BTL
  • Audio performance Into 4 Ω at 14.4 V BTL
    • THD+N < 0.02% at 1 W
    • 42 µVRMS Output Noise
    • –90 dB Crosstalk
  • Load diagnostics with Host-independent operation
    • Output open and shorted load
    • Output-to-battery or ground shorts
    • Line output detection Up to 6 kΩ
  • Protection
    • Output current limiting and short protection
    • 40 V Load dump
    • Open ground and power tolerant
    • Overtemperature warning and shutdown
    • Undervoltage and overvoltage, DC Offset
  • General operation
    • 4.5 V to 26.4 V supply voltage
    • I2C control with 4 address options
    • Clip detection (latching or non-latching)

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Part number Order Audio input type Architecture Speaker channels (Max) Power stage supply (Min) (V) Power stage supply (Max) (V) Output power (W) Load (Min) (ohms) THD + N @ 1 kHz (%) Iq (Typ) (mA) Control interface Closed/open loop Analog supply (Min) (V) Analog supply (Max) (V) Power to parallel bridge tied load (Max) (W) Sampling rate (Max) (kHz) PSRR (dB) Operating temperature range (C) Rating
TAS6421-Q1 Order now Digital Input     Class-D     Mono     4.5     26.4     75     2     0.02     47     I2C     Closed     4.5     26.4       96     75     -40 to 125     Automotive    
TAS6422-Q1 Samples not available Digital Input     Class-D     Stereo     4.5     26.4     75     2     0.03     120     I2C     Closed     4.5     26.4     150     96     75     -40 to 125     Automotive    
TAS6424-Q1 Order now Digital Input     Class-D     4     4.5     26.4     75     1     0.02     165     I2C     Closed     4.5     26.4     150     96     75     -40 to 125     Automotive    
TAS6424L-Q1 Order now Digital Input     Class-D     4     4.5     18     75     2     0.03     165     I2C     Closed     4.5     18     70     96     70     -40 to 125     Automotive    
TAS6424M-Q1 Order now Digital Input     Class-D     4     4.5     18     45     1     0.02     165     I2C