TDA7851

TDA7851 is a dual, automotive-grade audio power amplifier IC from STMicroelectronics. It provides two high‑power, class‑AB channels with bridge‑tied‑load (BTL) outputs, enabling direct drive of loudspeakers without output coupling capacitors. Designed for car radios and multimedia systems, it combines relatively high output with good efficiency and compact external circuitry.
Key features typically include built-in thermal and short‑circuit protection, undervoltage lockout, pop/noise suppression, and mute/standby control. External parts are minimal; gain is set via a feedback network, and inputs are fed through coupling capacitors. The device is packaged in common automotive/PCB layouts (e.g., Multiwatt-like or D²PAK/Mini modules) with heat sinking for power dissipation.
Applications include car head units, in-vehicle audio systems, and compact stereo amplifiers requiring two high‑power channels from a single IC. For exact electrical specs—power ratings, load impedance, voltage range, distortion, and protection behaviors—consult the official TDA7851 datasheet and application notes.

- Dual channel car-audio power amplifier with Bridge-Tied Load (BTL) outputs
- Designed for automotive 12 V systems (typical supply range ~6–18 V)
- Stable into common speaker loads (4 Ω and 8 Ω)
- Built-in protection: overcurrent/short-circuit, overload, overtemperature, undervoltage
- Pop-free turn-on with mute and standby control
- Easy integration with logic control for mute/standby
- Thermal management and current limiting for reliability
- Low distortion and good signal-to-noise performance
- Compact package with integrated protection features for automotive use

The TDA7851 is available in the Multiwatt-15 power package (through-hole).

- Pin count: 16 pins (16-pin package, e.g., DIP-16/Multiwatt-16).
- Function: Dual automotive audio power amplifier (two-channel, BTL outputs) for car radios. Provides two independent outputs to drive speakers, with integrated protection (mute/standby, thermal/shutdown, short-circuit protection) and is designed for automotive supply (about 12 V nominal).

Manufacturer: NXP Semiconductors (formerly Philips Semiconductors).
What kind of company: A Dutch multinational that designs and manufactures semiconductor devices and integrated circuits for automotive, consumer, industrial, and communications applications.

Primarily automotive audio. Used in in-dash head units, car radios, and infotainment systems as a built-in speaker power amplifier; also suitable for automotive stereo modules and other compact audio power stages. Can be employed in consumer audio gear that requires a robust, integrated power amplifier with protections (short‑circuit, thermal) and mute/standby capabilities.

Direct equivalents are limited. Closest members in the Philips/NXP TDA family are TDA7850, TDA7852, and TDA7854. For cross-brand replacements, look for 2-channel car-audio power amplifiers with similar specs (4–8 ohm load, about 18–25 W per channel).