TDA7850A

Overview

The TDA7850A is a Class-AB MOSFET quad bridge power amplifier designed for high-power car radio applications. It features a fully complementary P-Channel/N-Channel output structure enabling rail-to-rail voltage swing. Key electrical parameters include a maximum supply voltage of 18V, operating temperature range from -55°C to +150°C, and fixed internal gain of 26 dB. Output capabilities reach up to 4 x 50 W into 4 Ω or 4 x 85 W into 2 Ω. The device integrates DC offset detection, standby/mute functions, and comprehensive protection against short circuits, overtemperature, and load dump.

Feature Summary

• MOSFET output stage with complementary P-Channel/N-Channel architecture for high efficiency and low saturation losses
• Integrated DC offset detector for precise audio performance monitoring
• Built-in protections including output short circuit, thermal limiting, and reversed battery handling
• Automotive-grade qualification compliant with AEC-Q100 standards

Applications

• High-power automotive radio systems
• Car audio amplification
• Vehicle infotainment sound processing

Procurement Notes

Verify the specific suffix (e.g., AH, AS) to confirm package orientation and pinout compatibility before integration. Confirm RoHS3 compliance status for current production batches. Ensure the selected variant matches the required Flexiwatt package type (25 or 27 pins). Validate that the design supports the necessary heat dissipation for the through-hole mounting style.

Selection Notes

Select this component for designs requiring high output power in a single-chip solution. The fixed 26 dB gain eliminates external compensation requirements. Consider the 2 Ω driving capability if lower impedance speakers are used. Verify that the system can handle the 18 V maximum supply voltage and that the PCB layout accommodates the large thermal mass of the Flexiwatt package.

Part Context

Part of the TDA7850 series of automotive audio amplifiers. This series utilizes advanced MOSFET technology to deliver superior distortion performance compared to traditional bipolar designs. The family includes variants with different diagnostic interfaces and package options, all targeting the demanding environment of modern vehicle audio systems.

Replacement Considerations

TDA7850H: Similar quad bridge amplifier but may differ in specific package dimensions or thermal characteristics. TDA7851A: Comparable 4-channel Class-AB amplifier with similar power ratings but potentially different gain or protection thresholds. Verify pin-to-pin compatibility and thermal resistance values when substituting.