TDA7850

Overview

The TDA7850 is a four-channel Class-AB MOSFET quad bridge power amplifier designed for automotive audio applications. It delivers up to 50 W per channel into 4 Ω loads and supports low impedance driving down to 2 Ω. The device operates within an 8 V to 18 V supply range and features internally fixed gain of 26 dB, eliminating the need for external compensation or bootstrap capacitors. Integrated protections include short circuit, thermal limiting, DC offset detection, and load dump handling.

Feature Summary

• MOSFET output power stage with excellent low impedance driving capability
• Integrated protection against short circuits, overtemperature, and reversed battery conditions
• Low external component count due to internally fixed gain and no required bootstrap capacitors
• Supports standby and mute functions with automute at minimum supply voltage detection

Applications

• Automotive speaker amplification systems
• High-fidelity car audio multi-channel setups
• Vehicle infotainment audio processing units

Procurement Notes

Verify the specific package variant (Flexiwatt-25 vertical vs. horizontal) and suffix codes when sourcing. Confirm AEC-Q100 qualification status if automotive reliability is required. Check datasheet revisions for pinout consistency across production batches. Ensure compatibility with existing PCB footprints before procurement.

Selection Notes

Select this component for high-power automotive audio requiring robust drive capability into low-impedance speakers. The integrated MOSFET stage and comprehensive protection suite simplify design compared to discrete solutions. Consider the Flexiwatt-25 package for through-hole mounting requirements in vehicle chassis environments.

Part Context

Part of the STMicroelectronics TDA7850 series of automotive audio amplifiers. Designed to meet modern engine start-stop and hybrid standards. Offers a compact single-chip solution replacing multiple discrete components while maintaining high audio fidelity and system reliability in harsh automotive electrical environments.

Replacement Considerations

TDA7850H is a documented variant within the same product family offering equivalent functional specifications.