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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics TDA749313TR

Name: TDA749313TR
Brand: STMicroelectronics
SKU: TDA749313TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA749313TR

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: TDA749313TR.pdf

Description:: IC AMP CLASS D STER 3W 24HTSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TDA749313TR from STMicroelectronics is a dual-channel 3 W + 3 W filterless Class-D audio amplifier in HTSSOP24-EPD package, operating from 3.0 V to 5.5 V single supply, delivering 83% efficiency and fixed gain options (6/12/15.6/18 dB) for LCD TV and compact speaker systems.

For engineers reviewing the TDA749313TR datasheet, TDA749313TR pinout, TDA749313TR application, or TDA749313TR equivalent, this device supports differential input noise rejection, standby control, thermal/short-circuit protection, and external clock synchronization - critical for EMI-sensitive consumer audio designs.

Technical Context

The TDA749313TR implements unipolar PWM modulation per BTL channel, enabling filterless operation by shifting differential output between 0/+VCC or 0/−VCC - doubling effective switching frequency to ~315 kHz while minimizing audible artifacts. Its internal oscillator (set via ROSC pin) or external sync (via SYNCLK) ensures multi-device timing coherence.

Differential inputs (INPL/INNL, INPR/INNR) with 60 kΩ input resistance suppress common-mode noise; gain is digitally selected via GAIN0/GAIN1 logic pins (6–18 dB), and standby mode reduces quiescent current to 1 µA while enabling pop-noise suppression during power transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	3.0 W + 3.0 W @ 4 Ω, THD = 10%, 5 V, filterless - sufficient for stereo desktop speakers without LC filters
Supply Voltage	3.0 V to 5.5 V single supply - compatible with USB-powered and battery-backed consumer devices
Efficiency	83% @ 2.8 W + 2.8 W - minimizes thermal dissipation, eliminating need for external heatsink
Gain Options	6 dB / 12 dB / 15.6 dB / 18 dB - selectable via two logic pins, enabling system-level signal chain optimization
THD+N	0.05% @ 0.5 W, 1 kHz - meets fidelity requirements for mid-tier multimedia audio
Switching Frequency	315 kHz typical (internal oscillator) - places PWM energy beyond audible range and simplifies EMI filtering
Crosstalk	−60 dB @ 1 kHz - ensures channel isolation in compact dual-mono layouts

Pinout & Package

HTSSOP24 package with exposed pad down (EPD), thermally connected to ground - enables high-power dissipation without external heatsink. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
INPL / INNL INPR / INNR	Differential audio inputs (L/R)	Rejects common-mode noise; requires no DC biasing - simplifies analog front-end design
OUTPL / OUTNL OUTPR / OUTNR	BTL PWM outputs (L/R)	Drive speaker directly in filterless mode; unipolar scheme reduces EMI vs bipolar PWM
STANDBY	Digital enable control	Active-low logic input; internal pull-down ensures safe default state and enables pop-free startup
GAIN0 / GAIN1	Gain selection inputs	Two-pin binary encoding selects closed-loop gain; internal pull-down sets default to 6 dB
ROSC	Oscillator frequency setting	Resistor-to-ground sets internal clock (250–400 kHz); <60 kΩ required in master mode
SYNCLK	External clock I/O	Configurable as output (master) or input (slave) for synchronized multi-amplifier systems
PVCCPL / PVCCNL PVCCPR / PVCCNR	Power stage supplies	Separate positive/negative rail pins per channel - improve PSRR and reduce cross-talk
PGNDPL / PGNDNL PGNDPR / PGNDNR	Power stage grounds	Dedicated low-impedance return paths minimize ground bounce in high-current PWM switching

Key Features

Feature	Design Value
Filterless operation	Eliminates external LC filters - reduces BOM count, PCB area, and cost in space-constrained LCD TV cradles
Differential input architecture	60 kΩ input resistance with inherent CMRR - rejects noise from shared digital supply rails
Thermal & short-circuit protection	Auto-shutdown at 150 °C junction temp or load short - prevents failure during fault conditions
Standby mode with pop suppression	1 µA quiescent current + pre-charge/mute states - enables always-on UI responsiveness without speaker click
Externally synchronizable clock	SYNCLK pin supports master/slave daisy-chaining - essential for multi-amplifier systems avoiding beat frequencies

Applications

LCD Television Audio Output

Compact Desktop Speaker Systems

Use Scenario: Integrated stereo audio amplification in slim-profile LCD TVs with space-limited chassis.

IC Role / Device Role / Timing Role: Dual BTL Class-D amplifier driving 4 Ω speakers directly without LC filters; synchronized via internal oscillator.

Use Value: Reduces component count by eliminating four inductors/capacitors per channel, lowering assembly cost and board area by >30%.

Use Scenario: Battery- or USB-powered stereo speaker docks with minimal footprint.

IC Role / Device Role / Timing Role: Low-quiescent-current audio driver with standby mode and differential inputs to reject USB noise.

Use Value: 83% efficiency extends battery life; 1 µA standby current enables instant wake-up without power switch.

Monitor-Mounted Speaker Cradles

Smart Display Audio Modules

Use Scenario: Embedded audio in monitor stands where heat dissipation and EMI are constrained.

IC Role / Device Role / Timing Role: Filterless Class-D amplifier with exposed-pad thermal path - no heatsink needed despite 3 W/channel output.

Use Value: Enables silent passive cooling in sealed enclosures; unipolar PWM lowers radiated emissions vs bipolar alternatives.

Use Scenario: Voice-enabled smart displays requiring clean audio output alongside RF modules.

IC Role / Device Role / Timing Role: Synchronized dual-channel amplifier using external clock (SYNCLK) to avoid interference with Wi-Fi/Bluetooth bands.

Use Value: Clock synchronization eliminates heterodyne tones; −60 dB crosstalk preserves stereo imaging in voice+music playback.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel Class-D audio amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TAS5102DAP	Higher 5 W + 5 W output but requires external LC filter; 32-pin HTSSOP vs 24-pin	Needs larger PCB area and higher BOM cost due to mandatory filter components	Select when higher output power justifies added complexity and thermal margin is available
MAX9718ETE+	Lower 1.4 W + 1.4 W output; 16-pin TQFN; no differential inputs or external sync capability	Limited noise immunity and no multi-device synchronization - unsuitable for EMI-sensitive or multi-amp systems	Choose only for ultra-low-cost, low-power mono/stereo applications without stringent noise or timing requirements

Compared with TAS5102DAP and MAX9718ETE+, the TDA749313TR uniquely balances filterless operation, differential input noise rejection, and external clock sync in a compact 24-pin EPD package - making it optimal for cost- and space-constrained consumer displays requiring robust audio performance.

Availability

TDA749313TR is available at Aetrix Electronics and suitable for LCD television audio subsystems, compact speaker cradles, monitor-integrated soundbars, and smart display modules requiring stable component supply across production lifecycles.

Supply support for TDA749313TR 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, designing and manufacturing analog, mixed-signal, and power ICs for automotive, industrial, and consumer markets.

The TDA749313TR belongs to ST's Class-D audio amplifier product line, engineered specifically for space- and efficiency-constrained consumer displays and compact audio systems requiring integrated protection and low-EMI operation.

FAQ

What is the minimum recommended PCB copper area for thermal management?

The datasheet specifies a 9 cm² copper area with via holes on FR4 for thermal resistance of 37 °C/W junction-to-ambient. The exposed pad must be soldered directly to this ground plane; insufficient copper or missing vias will cause thermal shutdown above 2.5 W/channel continuous output.

Can TDA749313TR drive 8 Ω speakers in filterless mode?

No - filterless operation is validated only for ≤50 cm cable length and 4 Ω loads per channel. For 8 Ω speakers, an external LC low-pass filter (e.g., 33 µH + 0.47 µF) is required to suppress EMI and ensure stability, as specified in Figure 9 of the datasheet.

How does the standby mode prevent speaker pop noise?

Standby activation triggers internal pre-charge and mute states before full power-up, ramping bias points and muting outputs to avoid DC transients. This sequence - combined with differential inputs and internal pull-downs on STANDBY/GAIN pins - eliminates audible clicks during power cycling.

Is external clock synchronization mandatory for multi-device designs?

No, but strongly recommended: unsynchronized TDA749313TR units may generate beat frequencies causing audible heterodyne tones. Using one device as master (ROSC-connected) and others as slaves (SYNCLK-input, ROSC floating) ensures identical switching frequencies and eliminates interference.

TDA749313TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Class D

Output Type:: 2-Channel (Stereo)

Max Output Power x Channels @ Load:: 3W x 2 @ 4Ohm

Voltage - Supply:: 3V ~ 5.5V

Features:: Differential Inputs, Short-Circuit and Thermal Protection, Standby

Mounting Type:: Surface Mount

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: 24-HTSSOP

TDA749313TR FAQ

1.How can I place an order for TDA749313TR through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA749313TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TDA749313TR reliable?

The price and inventory of TDA749313TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA749313TR is usually 5 days.

3.What payment methods are accepted for TDA749313TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA749313TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA749313TR?

TDA749313TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA749313TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TDA749313TR?

For technical support, including TDA749313TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA749313TR requirements.

6.How does Aetrix verify that TDA749313TR is sourced from the original manufacturer or authorized distributors?

All TDA749313TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA749313TR meets industry standards.

7.What is the process for return or replacement of TDA749313TR?

All TDA749313TR units undergo pre-shipment inspection (PSI). If there is an issue with TDA749313TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TDA749313TR part is unused and in its original packaging.

Return procedure for TDA749313TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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