TDF8554J/N3,112

Overview

The TDF8554J/N3,112 is an I2C-bus controlled quad bridge-tied load (BTL) audio power amplifier designed for automotive applications. It integrates multiple voltage regulators and two power switches within a Silicon-On-Insulator (SOI)-based BCD process. The device features a complementary DMOS output stage capable of delivering 4x45W into 2 or 4 ohm loads. It operates at battery voltages as low as 6V, supporting stop/start-car functionality without audible disturbance during engine start.

Feature Summary

• Complementary DMOS output stage ensures high power output signal with perfect sound quality
• Full I2C-bus controlled diagnostics including speaker fault detection and start-up diagnostics
• Integrated multiple voltage regulators comprising four programmable regulators, one standby regulator, and two power switches
• Robust construction via SOI-based BCD process prevents latch-up and ensures channel isolation

Applications

• Automotive audio systems requiring I2C control
• Stop/start-car operation environments
• Applications demanding robust latch-up protection

Procurement Notes

Verify the specific suffix N3,112 against official NXP documentation to confirm package type and marking details. Confirm current lifecycle status as distribution availability varies by region. Ensure compatibility with existing 3.3V and 5V I2C bus levels in the target design.

Selection Notes

Select this component for designs requiring integrated diagnostics and voltage regulation in a single package. It serves as a hardware and software downwards-compatible replacement for the predecessor TDA8589XJ series. Consider its suitability for low-voltage automotive environments where engine start stability is critical.

Part Context

This part belongs to the TDF85xx family of automotive audio amplifiers from NXP Semiconductors. It represents a generation of amplifiers combining high-power output with comprehensive digital control capabilities. The family targets modern vehicle infotainment systems needing efficient power management and diagnostic feedback.

Replacement Considerations

The TDF8554J is documented as being soft- and hardware downwards-compatible with the TDA8589XJ series. Verify pinout and register mapping when migrating from older TDA8589XJ components to ensure functional equivalence in the existing system architecture.