TDA7851L

Overview

The TDA7851L is a Class-AB audio power amplifier utilizing Multipower BCD technology and MOSFET output stages. It delivers up to 4 x 48 W into 4 Ω or 4 x 72 W into 2 Ω. Operating on a single supply from 8 V to 18 V, it features internally fixed gain of 26 dB with no external compensation required. The device includes protections for short circuits, overtemperature, load dump, and reversed battery.

Feature Summary

• Fully complementary P-Channel/N-Channel output structure enabling rail-to-rail voltage swing
• Automute function triggered by minimum supply voltage detection
• Integrated standby and mute control functions
• Comprehensive protection against output shorts, inductive loads, and thermal overload

Applications

• High-power car radio systems
• Automotive infotainment audio amplification
• Vehicle body and convenience electronics

Procurement Notes

Verify the specific suffix 'L' corresponds to the Flexiwatt-25 package variant. Confirm AEC-Q100 qualification status for automotive reliability requirements. Ensure design compatibility with the specified 25-pin through-hole mounting style and single-supply voltage range before integration.

Selection Notes

Select this component for applications requiring high output power with minimal external components. The internal fixed gain eliminates the need for external feedback networks or bootstrap capacitors. Suitable for designs prioritizing distortion performance and robust protection features in constrained automotive environments.

Part Context

Part of the STMicroelectronics TDA7851 series of quad bridge power amplifiers. Designed specifically for the automotive sector, it complements other Class-AB solutions like the TDA7851A and TDA7851F, offering distinct packaging and impedance driving capabilities tailored for vehicle audio systems.

Replacement Considerations

TDA7851A (Flexiwatt-27 package, 4 Ohm load) and TDA7851F (Flexiwatt-25 package). Verify pinout and thermal characteristics when substituting.