STMicroelectronics TDA7438D013TR

Overview

TDA7438D013TR from STMicroelectronics is a digitally controlled 3-band audio processor IC for automotive and Hi-Fi systems, featuring stereo input multiplexing (3 sources), independent left/right speaker attenuation (0 to –79 dB in 1.0 dB steps), and tone control (bass/middle/treble ±14 dB in 2.0 dB steps), all programmable via I²C bus. It operates from 6–10.2 V supply and delivers <0.08% THD at 1 Vrms.

For engineers reviewing the TDA7438D013TR datasheet, TDA7438D013TR pinout, TDA7438D013TR application, or TDA7438D013TR equivalent, key selection criteria include I²C-compatible serial control, 28-pin SO package compatibility, mute attenuation ≥80 dB, and support for external filter tuning of bass/middle/treble center frequencies.

Technical Context

The TDA7438D013TR implements analog signal conditioning using bipolar/CMOS technology with internal resistor networks (e.g., 44 kΩ for bass, 25 kΩ for middle, 25 kΩ for treble) and external passive components to configure bandpass or high-pass filter responses. Its I²C interface supports start/stop conditions, 8-bit subaddressing, and auto-increment mode for sequential register writes.

All controls-including volume (–47 dB to 0 dB), input gain (0–30 dB), and speaker attenuation (–79 dB to 0 dB)-are implemented via digitally addressed analog switches and op-amp-based gain stages, enabling precise DC-coupled step resolution without audible zipper noise.

Key Specifications

Pinout & Package

Package: SO-28 (Small Outline, 300 mil width), RoHS-compliant, tape-and-reel format (TDA7438D013TR).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7438D013TR, the TDA7439D013TR extends functionality with headphone drive but retains full register compatibility, whereas the STA559BW replaces analog tone control with embedded DSP and lacks discrete bass/middle/treble register mapping-making it unsuitable for legacy firmware reuse.

Availability

TDA7438D013TR is available at Aetrix Electronics and suitable for car-radio head units, Hi-Fi pre-amplifiers, and aftermarket audio DSP modules requiring stable component supply and long-lifecycle support.

Supply support for TDA7438D013TR 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 analog, power, and automotive ICs with strong emphasis on reliability and industrial-grade qualification.

The TDA7438 belongs to ST's automotive audio processor product line, designed specifically for high-fidelity signal conditioning in cost-sensitive, thermally demanding environments like car cabins and consumer Hi-Fi equipment.

FAQ

What is the maximum input signal level the TDA7438D013TR can handle without clipping?

The TDA7438D013TR supports up to 2.0 Vrms input signal level at the analog inputs (INL/INR) before clipping occurs, as specified in Table 4 under "VCL Clipping Level" with THD = 0.3%. This rating applies across all input gain settings and ensures compatibility with standard line-level sources in automotive and consumer audio systems.

Does the TDA7438D013TR require external passive components for tone control?

Yes - bass, middle, and treble control require external resistors and capacitors connected to dedicated IN/OUT pins (e.g., BIN(L)/BOUT(L), MOUT(L)/MOUT(R), TREBLE(L)/TREBLE(R)) to define center frequency and Q factor. The datasheet provides design equations and example values (e.g., 18 nF + 2.7 kΩ for bass) to achieve target filter responses.

Can the TDA7438D013TR operate from a 5 V supply?

No - the absolute minimum supply voltage is 6 V, and typical operation requires 9 V (with max 10.2 V). Operating below 6 V risks functional failure, including loss of I²C communication, reduced dynamic range, and unstable biasing of internal op-amps and switch matrices.

Is the TDA7438D013TR pin-compatible with the DIP28 version of the TDA7438?

No - although both share identical register maps and electrical functionality, the SO-28 (TDA7438D013TR) and DIP28 packages have different pin numbering and physical layout. Pin 1 location, thermal pad presence, and lead pitch differ; PCB layout and footprint must be redesigned for SO-28 migration.