TDA7850H

The TDA7850H is a high-efficiency Class-AB car-audio amplifier designed to deliver four independent 50-watt audio channels using a durable Flexiwatt-25 through-hole package. Built on a MOSFET complementary P- and N-channel output stage, the device enables true rail-to-rail voltage swing, high current delivery and reduced saturation losses—ideal for modern vehicle entertainment systems requiring louder output with minimal distortion.

With Hi-Fi grade audio characteristics, low noise, a 26 dB fixed gain stage, and no external compensation requirements, this IC keeps PCB design simple and component count low. Integrated protection features, including short-circuit handling, thermal limiting, DC-offset detection, load-dump tolerance, reversed-battery protection, and open-ground safeguards, ensure long-term reliability in demanding automotive environments.

A built-in mute and standby control, plus automatic mute under low-voltage conditions, improves user power management. The amplifier supports 2-ohm and 4-ohm loads, making it an excellent choice for compact OEM car speakers requiring maximum power delivery at 12–14V supply rails.

Whether used for car radios, multi-channel speaker upgrading, infotainment amplifiers, home audio builds, or portable media systems, the TDA7850H combines high current drive, low heat buildup, and ultra-low distortion into a single automotive-rated package.

⭐ Key Technical Features (Consolidated)

• Quad-bridge Class-AB audio amplifier

• Output power capabilities:

  • 4×50 W @ 4Ω (max)

  • 4×30 W @ 4Ω @ 14.4V/1kHz/10% THD

  • 4×80 W @ 2Ω (max)

  • 4×55 W @ 2Ω @ 14.4V/1kHz/10% THD

• MOSFET complementary P/N-channel output stage

• True rail-to-rail voltage swing

• Excellent 2-ohm driving capability

• Hi-Fi class distortion and low noise architecture

• Internally fixed gain (26 dB)

• No external bootstrap capacitors required

• Integrated 0.35A high-side driver

• Mute & Standby functions

• Auto-mute at low supply voltage

• Wide 8V to ~18V operating range

• Integrated DC-offset detector

🛡️ Protection & Reliability

• Short-circuit protection (to GND, to supply, across load)

• Inductive-load tolerance

• Soft thermal limiting & temperature derating

• Load-dump ruggedness (automotive alternator spikes)

• Reversed-battery and open-ground protection

• ESD tolerance

🚗 Target Applications

• Car radio / automotive head units

• Multi-channel vehicle speaker amplifiers

• In-car infotainment upgrades

• Home theatre audio builds

• Portable or battery-driven sound systems

• DIY Hi-Fi power amplifiers
  

  Parameter	Value
  Channels	4 (Quad Bridge)
  Technology	MOSFET Class-AB
  Max Output (4Ω)	4 × 50 W
  Max Output (2Ω)	4 × 80 W
  Rated Supply Range	8V–14.4V (extended up to ~18V)
  Fixed Gain	26 dB
  Load Impedance	2Ω / 4Ω
  Quiescent Current	~180 mA
  Package	Flexiwatt-25 (Through-Hole)
  Operating Temp	–40°C to +105°C
  Storage Temp	–55°C to +150°C
  Mute / Standby	Yes
  Auto-mute	Yes
  Protections	Short-Circuit, Thermal, Offset, Reverse Battery