TDA8571J/N2,112

Overview

The TDA8571J/N2,112 is a quad bridge-tied load (BTL) car radio power amplifier featuring four Class-B output amplifiers in a 23-lead DBS23P package. It delivers 4 × 40 W into 4 Ω loads with a fixed closed-loop voltage gain of 34 dB. Operating supply voltage ranges from 6 V to 18 V, with a maximum non-repetitive peak output current of 10 A and repetitive peak current of 7.5 A. The device includes comprehensive diagnostic capabilities via an open-collector VDIAG pin for distortion, short-circuit, and thermal pre-warning detection.

Feature Summary

• Integrated dynamic distortion detector, short-circuit protection, and temperature pre-warning diagnostics accessible through a single open-collector output pin.
• Fixed 34 dB voltage gain with mode select functionality supporting operating, mute, and standby states to minimize quiescent current consumption.
• Robust protection against load dump, reverse polarity, and electrostatic discharge, ensuring safe operation under harsh automotive electrical conditions.

Applications

• Quad channel car radio power amplification
• Automotive audio system integration
• Bridge-tied load speaker driving

Procurement Notes

Verify component authenticity and datasheet revision status before design implementation. Confirm that the N2 suffix denotes the specific package variant within the TDA8571J family. Check for end-of-life or obsolescence notices as this specification dates to 2002. Ensure compatibility with existing PCB layouts due to the specific DBS23P lead configuration.

Selection Notes

Select this component for applications requiring high output power with minimal external components. The fixed gain simplifies circuit design compared to programmable amplifiers. Consider thermal management requirements given the 60 W total power dissipation rating. Verify that the 23-lead SIL package fits the mechanical constraints of the target enclosure.

Part Context

The TDA8571J belongs to NXP's legacy line of automotive audio power amplifiers designed for robust performance in vehicle environments. It serves as a direct replacement for earlier Philips Semiconductors designs, maintaining pin compatibility with certain predecessors while offering enhanced diagnostic features. This series supports the transition from analog to more integrated infotainment architectures.

Replacement Considerations

The datasheet notes pin compatibility with the TDA8568Q, except for gain differences. Designers should verify if the fixed gain difference impacts system performance when substituting these parts.