STMicroelectronics TDA7419

Overview

TDA7419 from STMicroelectronics is a dedicated 3-band car audio signal processor IC with integrated analog audio filters, I²C digital control, and 4 stereo inputs. It delivers soft-step volume control, independent bass/middle/treble adjustment (±15 dB), loudness compensation, subwoofer LPF (72–176 Hz), and 7-band spectrum analyzer output. Used in OEM automotive head units for real-time tone shaping and speaker management.

For engineers reviewing the TDA7419 datasheet, TDA7419 pinout, TDA7419 application, or TDA7419 equivalent, key selection considerations include its SO-28 package, BICMOS low-noise architecture (12 µV output noise), programmable filter center frequencies (e.g., bass f_C = 60/80/100/200 Hz), soft-mute attenuation (80–100 dB), and I²C-controlled 0.5–1.5 dB step resolution across all gain/attenuation stages.

Technical Context

The TDA7419 implements a fully analog audio signal path with digitally programmable filter coefficients via I²C, enabling runtime reconfiguration of bass (4 center frequencies, Q = 0.9–2.2), middle (4 center frequencies, Q = 0.45–1.4), and treble (4 center frequencies up to 21 kHz) sections. Its AutoZero circuit reduces input offset to ≤0.5 mV, while quasi-differential inputs support common-mode rejection ≥46 dB at 1 kHz.

It integrates four independent speaker outputs (front/rear left/right), a dedicated subwoofer output with configurable 3rd-order LPF (f_LP = 80/120/160 Hz), and a 7-band spectrum analyzer with center frequencies from 62 Hz to 17.6 kHz. All analog outputs feature 1.8–2 VRMS clipping level and 30–100 Ω output impedance.

Key Specifications

Pinout & Package

SO-28 surface-mount package (15.4 mm × 7.6 mm, 1.27 mm pitch), thermally optimized with exposed thermal pad (R_{th j-pins} = 85 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar car audio processor applications.

Compared with TDA7419, TDA7313 omits critical diagnostics (spectrum analyzer) and precision features (AutoZero, soft-step), while STA559BW shifts architecture to digital-first with no native analog input support-making TDA7419 uniquely suited for analog-signal-focused automotive head units requiring real-time tuning visibility and low-noise analog fidelity.

Availability

TDA7419 is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket stereo receivers, car audio calibration tools, and diagnostic analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TDA7419 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, specializing in automotive-grade analog, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing.

The TDA7419 belongs to ST's automotive audio processor product line, engineered specifically for cost-effective, high-SNR signal conditioning in 12 V vehicle environments-prioritizing ESD robustness (±1750 V HBM), thermal stability, and seamless I²C integration with host MCUs.

FAQ

What is the maximum clock frequency supported on the I²C bus for TDA7419 configuration?

The TDA7419 supports standard-mode I²C operation up to 100 kHz, as specified in Section 5 of the datasheet. It does not support fast-mode (400 kHz) or higher speeds. The internal timing ensures reliable register writes even with typical PCB trace capacitance (<400 pF), and no external pull-up adjustments beyond the recommended 4.7 kΩ are required for compliance.

Does TDA7419 require external capacitors for the CREF pin, and what value is specified?

Yes, a 100 nF ceramic capacitor must be placed between CREF (Pin 14) and GND to stabilize the internal reference voltage. This capacitor is mandatory for proper AutoZero operation and filter coefficient accuracy; omission causes audible distortion and unstable gain settings. The datasheet specifies X7R dielectric and placement within 5 mm of the pin.

Can the spectrum analyzer outputs (SAOUT) drive LEDs directly, or is buffering required?

SAOUT (Pin 26) provides 0–3.3 V analog voltage per band but has limited current drive (≤1 mA). Direct LED driving is not recommended due to voltage drop and non-linear response; a rail-to-rail op-amp buffer (e.g., TS912) or comparator stage is required for reliable LED bar-graph implementation per band.

How does the "soft-mute" function behave electrically, and what is its attenuation range?

Soft-mute attenuates audio output gradually over three timed phases (T1 ≈ 1 ms, T2 ≈ 2 ms, T3 ≈ 123 ms), achieving 80–100 dB total suppression. It is triggered by logic-low on the MUTE pin (Pin 21) and uses internal ramp generators-no external RC network needed. The final attenuation exceeds mechanical relay mute performance while eliminating thump artifacts.