STMicroelectronics TDA7318D013TR

Overview

TDA7318D013TR from STMicroelectronics is a digital-controlled stereo audio processor IC for automotive and Hi-Fi systems, integrating 4-channel stereo input multiplexing, I²C-programmable volume (1.25 dB steps), bass/treble (±14 dB, 2 dB steps), balance/fader (1.25 dB steps), and four independent speaker attenuators with mute. It operates from 6–10 V supply and delivers 106 dB signal-to-noise ratio with <0.1% THD at 1 kHz.

For engineers reviewing the TDA7318D013TR datasheet, TDA7318D013TR pinout, TDA7318D013TR application, or TDA7318D013TR equivalent, key selection criteria include I²C controllability, 4-input gain selectability (0–18.75 dB), speaker-level fader/balance resolution, mute attenuation (>100 dB), and SO28 thermal resistance (85 °C/W).

Technical Context

The TDA7318D013TR implements analog signal conditioning using bipolar/CMOS technology with resistor-switch networks and op-amps, enabling low distortion (0.01% typ.), low noise (2.5 µV), and minimal DC stepping (<20 mV). Its architecture supports simultaneous control of volume, tone, balance, fader, and speaker attenuation via a single I²C bus (100 kbit/s max).

All audio paths are fully differential-capable with 103 dB channel separation and 100 dB input isolation. Input gain selection (6.25 dB steps) adapts to varying source levels, while external equalizer/noise reduction interfaces are supported via dedicated IN/OUT pins for left/right channels.

Key Specifications

Pinout & Package

SO28 surface-mount package (18.1 × 10.65 mm, 1.27 mm pitch), thermally rated at 85 °C/W junction-to-pins. Designed for reflow soldering in compact automotive audio modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDA7318D013TR, TDA7377 integrates power amplification but sacrifices programmable speaker-level fader control, while CS4272-CQZ offers higher-resolution digital audio processing but omits analog input multiplexing and independent speaker attenuation-making TDA7318D013TR uniquely suited for mixed-source, multi-speaker analog audio routing.

Availability

TDA7318D013TR is available at Aetrix Electronics and suitable for automotive infotainment systems, aftermarket stereo receivers, and multi-zone home audio controllers requiring stable component supply, long-lifecycle support, and SO28-compatible reflow assembly.

Supply support for TDA7318D013TR 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, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The TDA7318 belongs to ST's automotive-grade audio processor product line, engineered specifically for robust, low-noise analog signal conditioning in vibration-prone, temperature-variable vehicle environments.

FAQ

What is the maximum input signal level the TDA7318D013TR can handle without clipping?

The TDA7318D013TR supports up to 2 Vrms input signal level (VCL specification) across all four stereo inputs. This is verified under standard test conditions (VS = 9 V, RL = 10 kΩ) and ensures linear operation even with high-output sources like professional line drivers or DACs with active output stages.

Does the TDA7318D013TR require external passive components for tone control?

Yes-the bass and treble response center frequency and Q factor depend on external RC networks connected to pins BASS, TREBLE, BIN(L/R), and BOUT(L/R). The datasheet provides standard values (e.g., 5.6 kΩ + 100 nF for bass) to achieve ±14 dB shelving response; alternative values allow custom EQ curves.

Can the TDA7318D013TR drive headphones directly?

No-it is not designed for headphone driving. Its outputs (pins 7, 17, 19, 20, 21, 23) are line-level (2 Vrms max, 75 Ω output impedance) intended for connection to power amplifiers or active speakers. Direct headphone connection would result in insufficient current drive and potential distortion.

Is the TDA7318D013TR pin-compatible with earlier TDA7318 variants?

Yes-TDA7318D013TR uses the SO28 package and shares identical pinout, electrical characteristics, and register map with TDA7318D (no suffix) and TDA7318N (DIP28 version). All share the same I²C address (0x40) and command structure, enabling drop-in replacement in existing designs.