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

STMicroelectronics TS4890IDT

Name: TS4890IDT
Brand: STMicroelectronics
SKU: TS4890IDT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4890IDT

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

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

Datasheet:: TS4890IDT.pdf

Description:: IC AMP CLASS AB MONO 1W 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:4,550

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Product details

Overview

TS4890IDT from STMicroelectronics is a rail-to-rail output 1 W audio power amplifier in SO8 package, designed for single-supply portable audio systems. It delivers 1 W RMS into 8 Ω at 5 V with 0.1% THD+N, operates from 2.2–5.5 V, and features active-low standby mode drawing only 10 nA. Used in mobile phones and notebook computers for speaker drive.

For engineers reviewing the TS4890IDT datasheet, TS4890IDT pinout, TS4890IDT application, or TS4890IDT equivalent, key selection criteria include low-voltage operation (2.2 V), ultra-low standby current, rail-to-rail output swing, pop/click suppression, and unity-gain stability with external gain-setting resistors.

Technical Context

The TS4890IDT is a Class-AB audio amplifier with internal thermal shutdown protection and integrated pop-and-click reduction circuitry. Its BTL-capable architecture supports both single-ended and bridge-tied-load configurations, enabling flexible output power scaling without external bootstrap components.

It uses an internal bias network to maintain stable quiescent current across supply voltages from 2.2 V to 5.5 V, and its PSSR of 75 dB at 217 Hz ensures robust immunity to GSM noise in cellular handsets. Gain is set externally via Rin and Rfeed, supporting closed-loop gains from 1 to 10.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	1 W RMS into 8 Ω @ 5 V, THD = 1%, f = 1 kHz - sufficient for loudspeaker drive in compact portable devices
Supply Voltage Range	2.2 V to 5.5 V - enables direct battery operation from single Li-ion or dual alkaline cells
THD+N	0.1% @ Pout = 250 mW, VCC = 5 V - preserves audio fidelity in mid-power playback scenarios
Standby Current	10 nA max with active-low STBY pin asserted - extends battery life during idle periods
PSSR	75 dB @ 217 Hz, VCC = 5 V → 2.2 V - suppresses power supply ripple and RF-induced noise in mobile applications
Gain Stability	Unity-gain stable - allows use with minimal external components and avoids oscillation risk in low-gain designs
Thermal Protection	Internal shutdown at 150 °C junction temperature - prevents damage under sustained overload or poor PCB heatsinking

Pinout & Package

TS4890IDT is housed in an SO8 (Small Outline 8-pin) package with standard 1.27 mm pitch, suitable for automated assembly and moderate power dissipation. Thermal resistance junction-to-ambient is 175 °C/W.

Pin	Circuit Role	Design Meaning
1 (IN+)	Non-inverting input	Accepts audio signal source; referenced to ground in SE configuration or half-supply in BTL
2 (IN−)	Inverting input	Connected to feedback network (Rin/Rfeed); sets closed-loop gain and DC bias point
3 (STBY)	Standby control input	Active-low enable: drives <10 nA when pulled low; high-impedance when floating or high
4 (GND)	Ground reference	Primary return path for input, output, and bias currents; must be low-impedance plane
5 (VOUT)	Amplifier output	Rail-to-rail capable output stage; drives speaker directly in SE mode or one side of BTL load
6 (VCC)	Positive supply	Single supply input (2.2–5.5 V); bypass capacitor (Cs) required between VCC and GND
7 (BYPASS)	Half-supply decoupling	Connects to 0.1 µF capacitor to GND to stabilize internal bias node for rail-to-rail operation
8 (OUT)	Secondary output (BTL mode)	Used only in bridge-tied-load configuration; inverted copy of Pin 5 output for doubled voltage swing

Key Features

Feature	Design Value
Rail-to-rail output swing	Enables full dynamic range utilization at low supply voltages (e.g., 2.2 V), maximizing loudness per watt
Pop-and-click suppression	Reduces audible transients during power-up/down and standby transitions-critical for user-facing audio systems
Ultra-low standby current (10 nA)	Extends battery runtime in always-on or intermittently used portable devices without requiring external power gating
75 dB PSRR at 217 Hz	Rejects GSM burst noise and switching regulator ripple, eliminating audible artifacts in cellular handset environments
Unity-gain stable architecture	Eliminates need for compensation capacitors; simplifies layout and reduces BOM count in gain-flexible designs

Applications

Mobile Handset Audio

Notebook Speaker Drive

Use Scenario: Driving mono loudspeaker in 4G/5G smartphone with single-cell Li-ion battery (3.0–4.2 V).

IC Role / Device Role / Timing Role: Single-ended audio power amplifier delivering 800 mW RMS into 8 Ω with <0.15% THD+N at 1 kHz.

Use Value: Eliminates need for boost converter by operating down to 2.2 V, preserving battery capacity while maintaining loudness.

Use Scenario: Driving stereo speakers in ultrabook using shared 3.3 V system rail.

IC Role / Device Role / Timing Role: Dual-channel implementation (two TS4890IDT) driving 4 Ω speakers in BTL mode for 1.6 W total output.

Use Value: Internal pop/click suppression prevents audible artifacts during OS-level audio resume after sleep.

PDA Media Playback

Portable Bluetooth Speaker

Use Scenario: Audio output stage in legacy PDA with 2.6 V alkaline supply and 8 Ω ceramic speaker.

IC Role / Device Role / Timing Role: Low-quiescent-current amplifier enabling >100 hr playback on two AA cells.

Use Value: 10 nA standby current minimizes self-discharge during pause modes, extending usable session time.

Use Scenario: Compact mono speaker module powered by 5 V USB-C input with integrated LiPo charging.

IC Role / Device Role / Timing Role: Primary output stage configured in BTL for 1.8 W into 4 Ω, with STBY controlled by MCU GPIO.

Use Value: 75 dB PSRR rejects noise from shared USB power rail and switching charger ICs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TAS5707RTAT	Class-D, 3 W into 8 Ω, I²S input, integrated DSP - requires digital audio interface and external inductors	Higher efficiency (>90%) but larger solution size; suited for battery-powered streaming speakers	Select if system uses digital audio source and prioritizes efficiency over analog simplicity
TPA2013D1YZFT	Class-D, 3.2 W into 4 Ω, 2.5–5.5 V, integrated boost - includes adaptive DRC and thermal foldback	Higher output power and built-in protection, but lacks rail-to-rail analog input compatibility	Select if loudness and long-term reliability under variable load are critical, and digital control is available

Compared with TAS5707RTAT and TPA2013D1YZFT, the TS4890IDT offers superior analog input transparency, minimal external component count, and guaranteed rail-to-rail operation below 2.5 V-making it optimal for cost-sensitive, space-constrained analog audio paths.

Availability

TS4890IDT is available at Aetrix Electronics and suitable for mobile handsets, notebook computers, PDAs, and portable Bluetooth speakers requiring stable component supply across extended production lifecycles.

Supply support for TS4890IDT 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.

The TS4890 belongs to ST's low-voltage audio amplifier product line, engineered specifically for battery-powered consumer electronics where efficiency, small footprint, and acoustic quality at low supply voltages are essential.

FAQ

What is the minimum recommended bypass capacitor value on the BYPASS pin?

The BYPASS pin requires a 0.1 µF ceramic capacitor connected to ground to stabilize the internal bias node. This value is specified in ST's application schematic (Figure 2) and ensures proper rail-to-rail output swing across the full 2.2–5.5 V supply range. Larger values (e.g., 1 µF) do not improve performance and may slow startup transient response.

Can TS4890IDT drive a 4 Ω speaker in single-ended mode?

Yes, but with derated output power and increased thermal stress. At 5 V, maximum safe continuous output into 4 Ω is 600 mW RMS (per Figure 20), limited by junction temperature rise. For full 1 W capability, use BTL configuration or 8 Ω load. Thermal shutdown activates at 150 °C junction temperature.

How does the STBY pin behave when left unconnected?

The STBY pin has an internal pull-down resistor (Rstb ≈ 10 MΩ per Table 2), so it defaults to active-low standby mode when floating, drawing <10 nA. To enable normal operation, STBY must be driven logic-high (≥0.7 × VCC) via MCU GPIO or external pull-up. No external pull-up is required unless fast wake-up timing is needed.

Is the TS4890IDT unity-gain stable with capacitive loads?

Yes, the amplifier is unity-gain stable with purely resistive feedback, but capacitive loads >100 pF on the output require series isolation resistor (typically 1–10 Ω) to prevent peaking or oscillation. This is confirmed in ST's "Decoupling of the circuit" section (5.5) and Figure 25–26 stability curves.

TS4890IDT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Class AB

Output Type:: 1-Channel (Mono)

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

Voltage - Supply:: 2.5V ~ 5.5V

Features:: Depop, Standby, Thermal Protection

Mounting Type:: Surface Mount

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

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

TS4890IDT FAQ

1.How can I place an order for TS4890IDT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4890IDT 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 TS4890IDT reliable?

The price and inventory of TS4890IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4890IDT is usually 5 days.

3.What payment methods are accepted for TS4890IDT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4890IDT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4890IDT?

TS4890IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4890IDT 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 TS4890IDT?

For technical support, including TS4890IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4890IDT requirements.

6.How does Aetrix verify that TS4890IDT is sourced from the original manufacturer or authorized distributors?

All TS4890IDT 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 TS4890IDT meets industry standards.

7.What is the process for return or replacement of TS4890IDT?

All TS4890IDT units undergo pre-shipment inspection (PSI). If there is an issue with TS4890IDT, 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 TS4890IDT part is unused and in its original packaging.

Return procedure for TS4890IDT:

1.Submit a request within 90 days.

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

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