STMicroelectronics TDA7439DS13TR

Overview

TDA7439DS13TR from STMicroelectronics is a three-band digitally controlled audio processor IC for car-radio and Hi-Fi systems, integrating stereo input multiplexing (4 inputs), independent bass/mid/treble control in 2-dB steps, volume control in 1-dB steps, dual speaker attenuators with mute, and I²C serial programmability. It uses bipolar/CMOS technology to achieve 0.01% THD, 106 dB SNR, and <3 mV DC step voltage.

For engineers reviewing the TDA7439DS13TR datasheet, TDA7439DS13TR pinout, TDA7439DS13TR application, or TDA7439DS13TR equivalent, key selection criteria include its SO28 package, I²C address 0x88, ±14 dB tone range, -47 dB volume range with mute, and dual 76 dB speaker attenuation capability - all critical for automotive infotainment signal chain design.

Technical Context

The TDA7439DS13TR implements analog signal conditioning via resistor-switch networks and operational amplifiers, with tone stages (bass, mid, treble) configured using external passive components - bass/mid use internal 44 kΩ/25 kΩ feedback resistors (RB/RM), while treble uses a fixed 25 kΩ internal resistor and external capacitor for high-pass filtering. Input gain is selectable in 2-dB steps across four stereo sources.

Control is fully digital via a 2-wire I²C interface (SCL/SDA) with no internal pull-ups, supporting auto-increment addressing and sub-addressed register access (0x0–0x7). Power-on reset defaults to IN2 input, 28 dB gain, mute volume, and 0 dB tone settings - ensuring deterministic startup behavior in embedded audio systems.

Key Specifications

Pinout & Package

Package: SO28 (Small Outline, 28-pin), 18.1 mm × 10.65 mm body, 1.27 mm pitch, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7439DS13TR, TDA7313 offers reduced input count and no speaker attenuation, limiting multi-source and multi-zone flexibility; STA559BW shifts to digital domain and integrated amplification, sacrificing analog fidelity and requiring complete architecture redesign.

Availability

TDA7439DS13TR is available at Aetrix Electronics and suitable for automotive infotainment head units, aftermarket car stereo receivers, and Hi-Fi integrated amplifiers requiring stable component supply, long-lifecycle availability, and consistent electrical performance across temperature ranges.

Supply support for TDA7439DS13TR 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, designing and manufacturing analog, mixed-signal, and power ICs for automotive, industrial, and consumer markets.

The TDA7439DS13TR belongs to ST's automotive-grade audio processor product line, engineered specifically for robust, low-noise analog signal conditioning in vehicle infotainment and premium audio systems.

FAQ

What is the I²C address and required pull-up configuration for TDA7439DS13TR?

The TDA7439DS13TR uses a fixed 7-bit I²C slave address of 0x44 (0x88 in 8-bit format including R/W bit). External pull-up resistors (typically 4.7 kΩ) are mandatory on both SCL and SDA lines - the device has no internal pull-ups, and operation fails without proper external termination to VS.

How does the input multiplexer handle source selection and gain matching?

The multiplexer selects one of four stereo input pairs (IN1–IN4) via I²C sub-address 0x0; gain is independently set per selected source using sub-address 0x1 in 2-dB increments from 0 to 30 dB. This allows optimal signal-level adaptation - e.g., boosting low-output AUX sources while attenuating high-level tuner outputs - before tone processing.

Can the bass, mid, and treble filters be customized, and how?

Yes - bass and mid-range stages use internal 44 kΩ (RB) and 25 kΩ (RM) resistors with external capacitors/resistors on MOUT/BOUT pins to define center frequency, Q factor, and gain; treble stage uses internal 25 kΩ resistor with external capacitor to ground on TREBLE pins to set high-pass cutoff. Filter response equations are provided in the datasheet.

What is the purpose of the CREF pin and recommended capacitor value?

CREF connects to an external decoupling capacitor that stabilizes internal bias references during power-up and operation. The datasheet specifies 10 µF as standard; reducing to 4.7 µF shortens power-on stabilization time - useful in systems requiring rapid audio enablement after ignition, without compromising steady-state performance.