STMicroelectronics TDA7375V

Overview

TDA7375V from STMicroelectronics is a Class AB quad-channel automotive audio power amplifier capable of dual-bridge (2×40W @4Ω) or quad single-ended (4×12W @2Ω) operation at 14.4V, with internally fixed 26dB BTL gain, CMOS-compatible ST-BY control, and integrated diagnostics for clipping, thermal proximity, and output shorts. It targets car radio mainboard amplification with minimal external components.

For engineers reviewing the TDA7375V datasheet, TDA7375V pinout, TDA7375V application, or TDA7375V equivalent, key selection criteria include bridge vs. SE configuration flexibility, built-in short-circuit diagnostics on Pin 10, rail-to-rail output swing without bootstrap capacitors, and ESD/inductive load robustness per automotive environment requirements.

Technical Context

The TDA7375V implements a fully complementary output stage using ST's proprietary ICV PNP transistors, enabling rail-to-rail swing without bootstrap capacitors and eliminating Boucherot cells. Its loop gain is intrinsically stabilized via local feedback, ensuring oscillation-free operation even at low closed-loop gain.

Diagnostics are consolidated on open-drain Pin 10: current sinking indicates clipping (short pulse), output fault (longer pulse), or thermal shutdown proximity (~10°C before trip). Stand-by activation uses CMOS-level input on Pin 7 with ≤5mA drive capability and mandatory 100nF S-GND decoupling to prevent pop noise.

Key Specifications

Pinout & Package

MULTIWATT15 (Vertical) package: 15-pin vertical through-hole with integrated heatsink tab (Pin 15), dual ground separation (P-GND Pins 3 & 13, S-GND Pin 1), and dedicated diagnostics output (Pin 10).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel automotive audio amplifier applications.

Compared with TDA7375V, TDA7377 delivers higher peak power but sacrifices integration (no internal gain, no diagnostics), while TPA5560QPHPRQ1 achieves superior efficiency and power density at the cost of added system complexity for fault monitoring and EMI filtering.

Availability

TDA7375V is available at Aetrix Electronics and suitable for automotive infotainment systems, OEM car radio designs, and aftermarket head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TDA7375V includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing and qualification capabilities.

The TDA7375V belongs to ST's automotive audio amplifier product line, engineered specifically for cost-sensitive, high-reliability car radio applications demanding integrated diagnostics, minimal external components, and robust short-circuit protection.

FAQ

What is the function of Pin 10 on the TDA7375V?

Pin 10 is an open-collector diagnostics output that sinks current to indicate three distinct conditions: clipping (short-duration pulse), output fault (longer pulse), or thermal shutdown proximity (~10°C before trip). Pulse width differentiation allows microcontroller firmware to isolate fault types without additional hardware.

Can the TDA7375V operate in both bridge and single-ended modes simultaneously?

No - the device must be configured entirely in either dual-bridge (2 channels) or quad single-ended (4 channels) mode per PCB layout. Bridge mode requires shorting IN+ to OUT− for each pair; mixing configurations on one die is not supported due to shared bias and thermal design constraints.

Why does the TDA7375V require separate P-GND and S-GND connections?

Separate power and signal grounds prevent high-current output return paths from modulating input reference voltage. P-GND (Pins 3,13) handles output and supply currents; S-GND (Pin 1) references inputs, ST-BY, and SVR. They must join at a single low-impedance point near the main supply capacitor to avoid ground loops and noise coupling.

What is the minimum recommended heatsink thermal resistance for continuous 2×25W operation?

For continuous 2×25W output at 14.4V, junction temperature must stay below 150°C. With 1.8°C/W j-case resistance and 85°C case limit, total system thermal resistance (heatsink + interface) must be ≤36°C/W. A 25°C/W extruded aluminum heatsink with thermal pad is the practical minimum for enclosed automotive environments.