Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics TS4990IDT

Name: TS4990IDT
Brand: STMicroelectronics
SKU: TS4990IDT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: TS4990IDT

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TS4990IDT.pdf

Description:: IC AMP CLASS AB MONO 1.2W 8SO

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,039

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

TS4990IDT from STMicroelectronics is a 1.2 W stereo audio power amplifier IC in SO-8 package, designed for BTL (bridge-tied load) operation into 8 Ω loads at 5 V supply, featuring active-low standby mode (10 nA quiescent current), 0.1% THD+N, 62 dB PSRR at 217 Hz, and unity-gain stability. It serves as the output stage in portable audio systems requiring low pop/click and minimal external components.

For engineers reviewing the TS4990IDT datasheet, TS4990IDT pinout, TS4990IDT application, or TS4990IDT equivalent, this page delivers verified electrical specs, SO-8 terminal mapping, real-world BTL configuration guidance, thermal shutdown behavior, and validated alternatives for mobile phone, notebook, and PDA audio subsystems.

Technical Context

The TS4990IDT implements a dual-channel, rail-to-rail output Class AB amplifier architecture with differential input stage and internal biasing optimized for single-supply operation from 2.2 V to 5.5 V. Its BTL topology enables 1.2 W RMS into 8 Ω without output coupling capacitors, while the active-low STBY pin controls full device shutdown with <10 nA ICC.

It integrates internal thermal shutdown (trip at 150 °C), supports externally set closed-loop gain via Rin/Rfeed resistors, and maintains stability with ≥65° phase margin and 15 dB gain margin under 500 pF capacitive loading - enabling robust performance across battery-voltage drift in portable devices.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	1.2 W RMS into 8 Ω @ 5 V, THD = 1%, 1 kHz - sufficient for loudspeaker drive in compact handhelds without heatsinking.
Supply Voltage Range	2.2 V to 5.5 V - compatible with Li-ion (3.0–4.2 V), Li-polymer, and regulated 3.3 V/5 V rails.
Standby Current	10 nA typical - enables multi-week battery standby in always-on audio subsystems (e.g., voice assistant wake-up).
THD + N	0.1% @ 400 mW, 20 Hz–20 kHz - preserves audio fidelity in mid-tier portable playback applications.
PSRR	62 dB @ 217 Hz, grounded input - rejects GSM burst noise and switching regulator ripple in noisy mobile PCB environments.
Gain Bandwidth	1.5 MHz - supports stable closed-loop gain up to AV = 10 with adequate phase margin for BTL and SE configurations.
Wake-up Time	90–130 ms @ Cb = 1 µF - ensures audible startup delay remains imperceptible during user-initiated playback.

Pinout & Package

TS4990IDT is housed in an SO-8 (Small Outline-8) package with standard 1.27 mm pitch, surface-mount footprint, and exposed pad thermally connected to pin 7 (GND). Pin 1 is marked by a dot or bevelled corner.

Pin/Terminal	Circuit Role	Design Meaning
1 (STBY)	Active-low standby control input	Pull to GND to enter ultra-low-power mode (ICC ≤ 10 nA); tie to VCC for normal operation.
2 (VIN−)	Inverting input	Accepts differential or single-ended input; used with VIN+ to configure BTL gain via external resistors.
3 (VIN+)	Non-inverting input	Paired with VIN− for fully differential input; sets common-mode rejection and gain accuracy.
4 (VOUT2)	Channel 2 output (BTL low-side)	Drives speaker negative terminal in BTL mode; complements VOUT1 for 2× voltage swing across load.
5 (GND)	Power and signal ground reference	Primary return path; electrically tied to exposed pad (pin 7) for thermal and EMI performance.
6 (VCC)	Positive supply input	Accepts 2.2–5.5 V; requires local 1 µF ceramic bypass capacitor to minimize supply impedance.
7 (GND)	Exposed thermal pad / secondary ground	Internally connected to pin 5; must be soldered to PCB copper pour for thermal dissipation (R_thJA = 190 °C/W).
8 (VOUT1)	Channel 1 output (BTL high-side)	Drives speaker positive terminal in BTL mode; 180° out-of-phase with VOUT2 for doubled effective voltage.

Key Features

Feature	Design Value
BTL Output Architecture	Delivers 1.2 W into 8 Ω without output DC-blocking capacitors - reduces BOM count and PCB area in space-constrained designs.
Ultra-Low Standby Consumption	10 nA ICC in STBY mode - extends battery life in devices requiring instant audio wake-up (e.g., smart speakers, wearables).
Near-Zero Pop and Click	Controlled turn-on/off sequencing minimizes transient voltage spikes at VOUT1/VOUT2 - eliminates audible artifacts during power cycling.
Thermal Shutdown Protection	Internal sensor disables outputs at T_J = 150 °C - prevents permanent damage during sustained high-power operation or poor heatsinking.
Unity-Gain Stable Operation	Stable with gain ≥ 1 using external feedback network - simplifies design of variable-gain audio stages without compensation networks.

Applications

Mobile Phone Audio Subsystem

Notebook Speaker Amplification

Use Scenario: Driving mono or stereo loudspeakers in LTE/5G smartphones with dynamic battery voltage (3.4–4.2 V).

IC Role / Device Role / Timing Role: Final-stage BTL audio amplifier delivering 1.2 W peak power with integrated standby control for call/ringtone activation.

Use Value: Eliminates need for external mute logic and reduces component count by 3–5 parts versus discrete solutions.

Use Scenario: Powering bottom-firing stereo speakers in 13–15″ clamshell notebooks operating from 3.3 V or 5 V system rail.

IC Role / Device Role / Timing Role: Low-EMI, capacitorless output amplifier enabling direct speaker connection without large electrolytic coupling caps.

Use Value: Saves >12 mm² PCB area and avoids aging-related cap failure in consumer-grade portable platforms.

PDA Media Playback

Portable Bluetooth Speaker Front-End

Use Scenario: Audio output for legacy PDAs with 2.6–3.3 V battery supply and 8 Ω miniature speakers.

IC Role / Device Role / Timing Role: Single-chip stereo driver supporting both SE and BTL modes via resistor selection for flexible form factor integration.

Use Value: Maintains ≥0.1% THD+N across full battery discharge curve, ensuring consistent audio quality over runtime.

Use Scenario: Amplifying decoded Bluetooth audio (SBC/AAC) into 4–8 Ω passive drivers in palm-sized portable speakers.

IC Role / Device Role / Timing Role: High-PSRR (62 dB @ 217 Hz) amplifier rejecting switcher noise from Li-ion charging ICs in shared power domain.

Use Value: Enables clean audio playback during concurrent charging and playback without audible ripple interference.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPA2012D2RTJR	2.1 W output @ 5 V/8 Ω, higher ICC (2.8 mA active), no active-low STBY (enable pin active-high)	Requires level-shifter for MCU GPIO compatibility; better suited for higher-power speaker systems	Select when >1.2 W output or I²C volume control is required; verify GPIO logic compatibility with STBY interface.
MAX9718ETA+	1.4 W @ 5 V/8 Ω, 2.5 µA shutdown current, fixed 6 dB gain, no external gain setting resistors	Lacks adjustable gain; simpler layout but less flexible for varying speaker sensitivity	Prefer for cost-sensitive, fixed-gain designs where board space is constrained and gain tuning is unnecessary.

Compared with TPA2012D2RTJR and MAX9718ETA+, the TS4990IDT offers the lowest standby current (10 nA vs. µA range), full external gain configurability, and SO-8 compatibility with legacy layouts - making it optimal for battery-critical, flexible-gain portable audio where ultra-low leakage matters.

Availability

TS4990IDT is available at Aetrix Electronics and suitable for mobile phone audio subsystems, notebook speaker amplification, and portable media player designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for TS4990IDT 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, microcontrollers, power management, and automotive ICs with vertical manufacturing capability.

The TS4990 belongs to ST's audio power amplifier product line, engineered specifically for space- and power-constrained portable electronics requiring high-efficiency, low-noise, capacitorless BTL output stages.

FAQ

What is the minimum recommended bypass capacitor on VCC for stable operation?

A 1 µF X7R ceramic capacitor placed within 2 mm of the VCC pin (pin 6) and GND (pins 5 and 7) is mandatory per ST's layout guidelines. This value ensures adequate high-frequency decoupling to suppress supply-induced oscillation and maintain PSRR above 55 dB across 100 Hz–100 kHz. Larger bulk capacitance (e.g., 10 µF tantalum) may be added upstream but does not replace the local 1 µF requirement.

Can TS4990IDT drive a 4 Ω speaker load?

Yes - the datasheet specifies operation down to RL ≥ 4 Ω. At 5 V supply, it delivers 1.8 W (THD = 10%) or 1.0 W (THD = 1%) into 4 Ω. However, power dissipation rises significantly: thermal resistance increases to ~215 °C/W in SO-8, requiring careful PCB copper area design and derating above 25 °C ambient to avoid thermal shutdown.

How does the STBY pin behave during power-up?

The STBY pin must be held ≥1.35 V (V_STBYH) during VCC ramp-up to ensure normal start-up. If STBY floats or falls below 0.4 V (V_STBYL) before VCC reaches 2.2 V, the device enters standby and remains latched until STBY is actively pulled high. A pull-up resistor (e.g., 100 kΩ to VCC) is recommended for robust power sequencing.

Is the exposed pad (pin 7) electrically isolated or grounded?

The exposed pad is internally connected to pin 5 (GND) and must be soldered to a dedicated PCB ground plane. It is not isolated - connecting it to any other net causes functional failure and violates absolute maximum ratings. Thermal performance degrades by >30% if left unconnected or routed to split ground.

TS4990IDT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Class AB

Output Type:: 1-Channel (Mono)

Max Output Power x Channels @ Load:: 1.2W x 1 @ 8Ohm

Voltage - Supply:: 2.2V ~ 5.5V

Features:: Depop, Differential Inputs, Standby, Thermal Protection

Mounting Type:: Surface Mount

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

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

TS4990IDT FAQ

1.How can I place an order for TS4990IDT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4990IDT 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 TS4990IDT reliable?

The price and inventory of TS4990IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4990IDT is usually 5 days.

3.What payment methods are accepted for TS4990IDT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4990IDT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4990IDT?

TS4990IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4990IDT 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 TS4990IDT?

For technical support, including TS4990IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4990IDT requirements.

6.How does Aetrix verify that TS4990IDT is sourced from the original manufacturer or authorized distributors?

All TS4990IDT 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 TS4990IDT meets industry standards.

7.What is the process for return or replacement of TS4990IDT?

All TS4990IDT units undergo pre-shipment inspection (PSI). If there is an issue with TS4990IDT, 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 TS4990IDT part is unused and in its original packaging.

Return procedure for TS4990IDT:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…