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

STMicroelectronics TDA7498

Name: TDA7498
Brand: STMicroelectronics
SKU: TDA7498
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA7498

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 36-PowerFSOP (0.295", 7.50mm Width)

Datasheet:: TDA7498.pdf

Description:: IC AMP D STEREO 100W POWERSSO36

Quantity:: RFQ Add To RFQ list

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Inventory:4,259

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Product details

Overview

TDA7498 from STMicroelectronics is a dual-channel BTL Class-D audio amplifier IC designed for high-power active speaker and home audio systems. It delivers 100 W + 100 W into 6 Ω at 10% THD with 36 V supply, operates from a single 14–39 V rail, achieves 90% efficiency, and supports four fixed gain settings (25.6–37.6 dB) via digital inputs GAIN0/GAIN1.

For engineers reviewing the TDA7498 datasheet, TDA7498 pinout, TDA7498 application, or TDA7498 equivalent, key selection considerations include differential input noise immunity, thermal/overcurrent protection behavior, external clock synchronization capability via SYNCLK, and PowerSSO-36 EPU package heatsinking requirements for sustained 200 W output.

Technical Context

The TDA7498 integrates two identical fully protected Class-D amplifier channels with independent PWM modulators, differential input stages, and internal 3.3 V regulators (VDDPW, VDDS, VSS). Each channel uses a fixed-frequency oscillator (290–330 kHz) configurable via ROSC or externally synchronized through SYNCLK for multi-amplifier phase coherence.

Protection logic includes overvoltage (42 V), undervoltage (8 V), overcurrent (7 A), and thermal shutdown (150 °C), with diagnostic feedback via open-drain DIAG pin. Gain is set digitally using two pins (GAIN0/GAIN1), and mode control (standby/mute/play) is implemented via STBY/MUTE logic levels per Table 6.

Key Specifications

Parameter	Value and Actual Design Meaning
Output power	100 W + 100 W @ THD = 10%, RL = 6 Ω, VCC = 36 V - enables compact high-fidelity stereo speaker designs without forced-air cooling
Supply range	14–39 V single supply - compatible with unregulated 24 V/36 V industrial and automotive audio rails
Efficiency	90% @ Po = 100 W + 100 W - reduces thermal load and heatsink size vs. Class-AB equivalents
Gain settings	25.6 / 31.6 / 35.1 / 37.6 dB - selectable via two logic inputs, eliminating external gain-setting resistors
THD+N	0.1% @ 1 W output - ensures low distortion in mid-to-high volume listening ranges
Switching frequency	290–330 kHz internal; 250–400 kHz externally synchronized - allows LC filter optimization for EMI compliance
Input resistance	60 kΩ differential - simplifies line-level interface design with standard consumer/pro-audio sources
Thermal resistance	2 °C/W junction-to-case - mandates direct thermal coupling of exposed pad to heatsink for full-power operation

Pinout & Package

Package: PowerSSO-36 with exposed pad up (EPU), requiring mechanical mounting to an external heatsink. Exposed pad (EP) must be connected to ground for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
OUTPA / OUTPB	Positive PWM output (left/right)	Drives high-side of BTL bridge; requires LC filter before speaker
OUTNA / OUTNB	Negative PWM output (left/right)	Drives low-side of BTL bridge; complements OUTPA/OUTPB for differential drive
PGNDA / PGNDB / PGND	Power stage ground	High-current return path for output stage; must be routed separately from signal ground
PVCCA / PVCCB	Power supply for left/right channel	Accepts 14–39 V; decoupling required close to pins to suppress switching noise
INPA / INNA / INPB / INNB	Differential analog inputs	Rejects common-mode noise; 60 kΩ input impedance sets RC high-pass cutoff with external Ci
STBY / MUTE	Digital mode control inputs	Logic-controlled sequencing: STBY=L → standby (10 µA); MUTE=L + STBY=H → mute (70 dB attenuation)
GAIN0 / GAIN1	Digital gain select inputs	Set closed-loop gain (25.6–37.6 dB); no pull-up/down needed - driven directly by MCU GPIO
ROSC / SYNCLK	Oscillator configuration	ROSC sets internal fSW (290–330 kHz); SYNCLK = output (master) or input (slave) for multi-device sync
DIAG	Open-drain fault indicator	Pulled high externally; goes high-Z during OVP/UVP/OCP/OTP - enables system-level fault logging
VDDPW / VDDS / VSS / SVCC / SGND	Internal regulator outputs/inputs	VDDPW powers gate drivers; VDDS/SVCC power signal blocks; all require local 1 µF ceramic decoupling

Key Features

Feature	Design Value
Dual BTL Class-D architecture	Delivers 200 W total output with <0.1% THD+N at 1 W and 90% efficiency - eliminates need for bulky heat sinks in space-constrained enclosures
Differential input stage	60 kΩ input impedance + common-mode rejection - enables robust connection to unbalanced line sources via simple RC coupling without noise pickup
Four-pin-selectable gain	25.6–37.6 dB in 6 dB steps - replaces manual resistor networks and supports firmware-configurable sensitivity across product SKUs
Multi-device clock synchronization	SYNCLK pin supports master/slave topology - ensures identical switching frequencies across multiple TDA7498s to prevent beat frequencies and EMI summation
Comprehensive protection suite	Integrated OVP (42 V), UVP (8 V), OCP (7 A), OTP (150 °C), plus diagnostic open-drain output - reduces external protection component count and BOM cost
Exposed-pad PowerSSO-36 package	Rth j-case = 2 °C/W - enables direct thermal interface to heatsink for continuous 100 W/channel operation without derating

Applications

Active Stereo Speaker

Home Theater Soundbar

Use Scenario: Compact 2.0-channel powered speaker with integrated DSP and Bluetooth receiver.

IC Role / Device Role / Timing Role: Dual-channel Class-D output stage driving 6 Ω woofers/tweeters; synchronized via SYNCLK to avoid inter-channel beat tones.

Use Value: 100 W/channel output enables high-SPL playback from small enclosures; 90% efficiency minimizes internal temperature rise during extended use.

Use Scenario: Slim-profile soundbar with front-firing left/right channels and passive radiators.

IC Role / Device Role / Timing Role: Primary audio power stage; differential inputs reject noise from adjacent digital subsystems; STBY/MUTE enable silent power-on/off sequencing.

Use Value: Single 36 V supply simplifies AC/DC adapter design; thermal protection prevents shutdown during bass-heavy content.

Multi-Room Audio Amplifier

Professional Monitor Controller

Use Scenario: Rack-mounted 4-zone amplifier with centralized clock distribution.

IC Role / Device Role / Timing Role: One TDA7498 per zone operating in slave mode, locked to master SYNCLK - ensures zero-phase jitter between zones.

Use Value: Eliminates audible heterodyne artifacts when zones play identical content; ROSC pins left floating to enforce slave configuration.

Use Scenario: Studio monitor controller with analog input switching, level trimming, and relay-based speaker protection.

IC Role / Device Role / Timing Role: Final output stage; DIAG pin feeds microcontroller to trigger relay disconnect on fault; GAIN0/GAIN1 set calibration-matched sensitivity.

Use Value: Open-drain DIAG provides fail-safe speaker disconnect signaling; 0.1% THD+N preserves critical audio fidelity for mixing applications.

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
TAS5634	Higher peak power (220 W/ch), but requires dual ±15 V supplies and larger PCB area; no integrated 3.3 V regulators	Better suited for high-end pro audio where discrete power supplies and layout control are available	Select TAS5634 only if >200 W/channel and lowest possible THD (<0.05%) are mandatory; TDA7498 offers simpler single-supply integration
TPA3255	Lower max output (150 W/ch @ 6 Ω), higher THD (0.04% typ), but includes integrated DSP and I²S interface	Ideal for digitally controlled smart speakers needing EQ, limiting, and multi-format input support	Choose TPA3255 when digital audio processing and flexible input routing outweigh raw analog output power; TDA7498 excels in analog-source-focused designs

Compared with TAS5634 and TPA3255, the TDA7498 uniquely balances high analog output power (100 W × 2), single-supply simplicity (14–39 V), and minimal external component count - making it optimal for cost-sensitive, thermally constrained active speaker platforms where analog inputs dominate.

Availability

TDA7498 is available at Aetrix Electronics and suitable for active speaker systems, home theater soundbars, multi-room audio amplifiers, and professional monitor controllers requiring stable component supply and long-term production continuity.

Supply support for TDA7498 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 analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The TDA7498 belongs to ST's high-efficiency audio power amplifier product line, engineered specifically for compact, high-output active speaker and home audio applications demanding thermal resilience and analog signal integrity.

FAQ

What is the minimum recommended supply voltage for continuous 100 W/channel operation?

The TDA7498 requires ≥34 V supply to deliver 80 W + 80 W into 8 Ω at 10% THD, and ≥36 V for 100 W + 100 W into 6 Ω. At 34 V, maximum output into 6 Ω drops to ~90 W/channel. Operation below 14 V is prohibited per absolute maximum ratings and will trigger undervoltage protection.

How is thermal protection triggered, and what happens after activation?

Thermal protection activates in two stages: at ~145 °C junction temperature, the device enters mute mode (50% PWM duty cycle); at 150 °C, it shuts down completely and forces outputs to high-impedance. Recovery occurs automatically once Tj falls below 140 °C, provided STBY remains high and supply voltage is valid.

Can the TDA7498 drive 4 Ω loads, and what derating applies?

Driving 4 Ω loads is not characterized in the datasheet and violates recommended operating conditions. The device is specified only for 6 Ω and 8 Ω loads. Attempting 4 Ω operation increases current stress beyond the 7 A overcurrent threshold and risks premature thermal shutdown or damage due to excessive power dissipation in the output stage.

Is external LC filtering mandatory, and what are the critical design constraints?

Yes - external LC filtering is mandatory to suppress EMI from the 290–330 kHz switching frequency. Cutoff must exceed 22 kHz but remain ≤1/10th of fSW (i.e., ≤30 kHz). For 6 Ω loads, typical values are 22 µH inductors and 470 nF capacitors; for 8 Ω, use 22 µH and 680 nF. Inductor saturation current must exceed 7 A peak.

TDA7498 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerFSOP (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Type:: Class D

Output Type:: 2-Channel (Stereo)

Max Output Power x Channels @ Load:: 100W x 2 @ 6Ohm

Voltage - Supply:: 14V ~ 39V

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

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: PowerSSO-36 EPU

TDA7498 FAQ

1.How can I place an order for TDA7498 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA7498 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 TDA7498 reliable?

The price and inventory of TDA7498 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7498 is usually 5 days.

3.What payment methods are accepted for TDA7498?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7498 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA7498?

TDA7498 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA7498 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 TDA7498?

For technical support, including TDA7498 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7498 requirements.

6.How does Aetrix verify that TDA7498 is sourced from the original manufacturer or authorized distributors?

All TDA7498 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 TDA7498 meets industry standards.

7.What is the process for return or replacement of TDA7498?

All TDA7498 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7498, 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 TDA7498 part is unused and in its original packaging.

Return procedure for TDA7498:

1.Submit a request within 90 days.

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

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