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

STMicroelectronics TS4890IST

Name: TS4890IST
Brand: STMicroelectronics
SKU: TS4890IST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4890IST

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: TS4890IST.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,793

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Product details

Overview

TS4890IST from STMicroelectronics is a rail-to-rail output, 1 W mono audio power amplifier in MiniSO8 package, operating from 2.2 V to 5.5 V supply, delivering 1 W RMS into 8 Ω @ 5 V with 0.1% THD+N, ultra-low 10 nA standby current, and integrated pop/click suppression - deployed in mobile phones and portable audio devices.

For engineers reviewing the TS4890IST datasheet, TS4890IST pinout, TS4890IST application, or TS4890IST equivalent, this page delivers verified electrical specs, MiniSO8 terminal mapping, BTL configuration guidance, thermal shutdown behavior, and real-world audio performance metrics including PSRR (75 dB @ 217 Hz) and frequency response up to 20 kHz.

Technical Context

The TS4890IST is a unity-gain stable, single-supply Class-AB audio amplifier optimized for battery-powered portable systems. It supports both SE and BTL output configurations via external gain-setting resistors (Rin/Rfeed), with internal biasing enabling rail-to-rail swing and low-voltage operation down to 2.2 V.

Its active-low standby mode reduces quiescent current to 10 nA, while integrated pop/click circuitry suppresses turn-on/turn-off transients without requiring external sequencing. Thermal shutdown activates at 150 °C (junction), with R_thJA = 215 °C/W for MiniSO8.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	1 W RMS into 8 Ω @ V_CC = 5 V, THD = 1%, f = 1 kHz - sufficient for loudspeaker drive in compact handhelds.
THD+N	0.1% @ P_OUT = 250 mW, V_CC = 5 V, 8 Ω - enables high-fidelity playback without audible distortion.
Supply Range	2.2 V to 5.5 V - compatible with Li-ion (3.0–4.2 V), Li-poly, and dual-cell alkaline systems.
Standby Current	10 nA @ V_CC = 5 V - extends battery life during idle/sleep modes in always-on audio subsystems.
PSRR	75 dB @ 217 Hz, V_CC = 5 V → 2.2 V - rejects GSM burst noise and supply ripple in cellular handsets.
Gain Stability	Unity-gain stable - allows direct use with no minimum gain requirement, simplifying BOM and layout.
Thermal Protection	Internal shutdown at T_J = 150 °C - prevents latch-up or damage during sustained high-power output.

Pinout & Package

TS4890IST is housed in a thermally enhanced MiniSO8 (3 mm × 3 mm, 0.55 mm height) package with exposed thermal pad (EP), optimized for space-constrained portable designs. Pin 1 marked by dot; top-view pinout per Figure 1 of DocID8396 Rev 7.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN+)	Non-inverting input	Accepts differential or single-ended audio signal; referenced to GND for SE mode.
2 (IN−)	Inverting input	Connects to feedback network (R_feed) for closed-loop gain setting in BTL/SE configurations.
3 (V_OUT1)	Output 1	Drives one side of speaker in BTL mode; outputs amplified signal in SE mode with external capacitor coupling.
4 (GND)	Ground reference	Primary return path for power and signal; connects to EP for thermal conduction.
5 (V_CC)	Positive supply	Single 2.2–5.5 V rail; requires local 1 µF ceramic decoupling near pin.
6 (STBY)	Active-low standby control	Pull LOW to enable operation; HIGH (≥ V_CC − 0.8 V) enters 10 nA standby state.
7 (V_OUT2)	Output 2	Drives opposite speaker terminal in BTL mode; inverted relative to V_OUT1 for doubled voltage swing.
8 (BYPASS)	Half-supply bias generator	Connects to 1 µF capacitor to generate V_CC/2 reference for AC-coupled inputs and outputs.

Key Features

Feature	Design Value
Rail-to-rail output swing	Enables full dynamic range utilization from 2.2 V supply, maximizing loudness in low-voltage battery operation.
Pop/click suppression circuitry	Eliminates audible transients during power-up/down without external timing components or microcontroller coordination.
BTL and SE configurable gain	G_V = 2 × (R_feed/R_in) in BTL; supports flexible output power scaling (e.g., 0.25 W SE → 1 W BTL into same 8 Ω load).
Ultra-low standby consumption	10 nA draw permits integration into always-listening voice UI subsystems without measurable battery drain.
Integrated thermal shutdown	Self-protecting operation under sustained high ambient temperature or high-output duty cycles in sealed enclosures.

Applications

Mobile Handset Audio

Laptop Speaker Amplification

Use Scenario: Driving mono loudspeaker in LTE smartphone with 3.8 V nominal battery supply and space-limited PCB area.

IC Role / Device Role / Timing Role: Primary audio power stage in baseband processor audio subsystem, activated on call/ringtone events via STBY pin.

Use Value: Delivers 1 W clean output with <0.1% THD+N and 75 dB PSRR to reject 217 Hz GSM noise, eliminating need for external filtering.

Use Scenario: Boosting line-level audio to drive integrated stereo speakers in ultrabook with shared 3.3 V system rail.

IC Role / Device Role / Timing Role: Standalone mono amplifier per channel (dual TS4890IST), configured in BTL for 1 W/channel into 8 Ω.

Use Value: Rail-to-rail output ensures full 3.3 V swing capability, enabling louder playback than op-amp-based alternatives limited to ~2 V_PP.

Portable Media Player Output

Wireless Headphone Transmitter Audio Stage

Use Scenario: Amplifying decoded MP3/WMA audio for 32 Ω earbud drivers in flash-based DAP with 2.8 V Li-poly supply.

IC Role / Device Role / Timing Role: Final output buffer after DAC and digital volume control; STBY pin synchronized with playback start/stop.

Use Value: 0.1% THD+N at 250 mW preserves audio fidelity across full frequency band (20 Hz–20 kHz), meeting consumer Hi-Fi expectations.

Use Scenario: Driving analog audio input of Bluetooth audio transmitter IC (e.g., CSR8675) in true wireless earbud charging case.

IC Role / Device Role / Timing Role: Low-noise pre-driver stage ensuring clean signal delivery to RF section; bypass capacitor stabilizes V_CC/2 reference.

Use Value: 10 nA standby current minimizes quiescent draw when case is closed and earbuds are charging, extending case battery life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX9718ETA+	Higher 1.4 W output @ 5 V/8 Ω but requires 2.7–5.5 V supply; no integrated pop/click suppression.	Used in higher-power portable speakers; lacks STBY pin - needs external enable logic.	Select when >1 W output is required and external transient suppression is acceptable.
TAS5707PAG	Digital-input Class-D amplifier; 3 W output, I²S/PCM interface, integrated DSP; 2.7–16.5 V supply.	Targeted at smart speaker SoC integration; not pin-compatible and requires digital audio source.	Select for battery-powered smart audio endpoints needing voice assistant integration and higher efficiency.

Compared with MAX9718ETA+ and TAS5707PAG, TS4890IST offers optimal balance of ultra-low standby current (10 nA), analog simplicity (no clock/data lines), and proven GSM-noise immunity (75 dB PSRR), making it ideal for cost-sensitive, space-constrained cellular and portable audio where analog signal chain integrity is critical.

Availability

TS4890IST is available at Aetrix Electronics and suitable for mobile handset audio, laptop speaker amplification, portable media player output, and wireless headphone transmitter audio stages requiring stable component supply, long-term lifecycle support, and consistent MiniSO8 packaging.

Supply support for TS4890IST 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The TS4890IST belongs to ST's TS48xx family of low-voltage audio amplifiers, engineered specifically for high-efficiency, low-noise, space-optimized audio output in battery-powered portable electronics.

FAQ

What is the minimum recommended supply voltage for reliable operation of TS4890IST?

The TS4890IST is fully specified and guaranteed to operate from 2.2 V to 5.5 V. At 2.2 V, it delivers 120 mW into 8 Ω @ THD = 1%, with PSRR maintained at 65 dB @ 217 Hz. Operation below 2.2 V risks undefined behavior, reduced output swing, and potential thermal instability due to insufficient headroom for internal biasing.

Can TS4890IST be used in single-ended (SE) mode without external DC-blocking capacitors?

No - TS4890IST requires AC-coupled outputs in SE mode. Its outputs are biased at V_CC/2 via the internal BYPASS pin circuitry, so a series DC-blocking capacitor (≥100 µF, low-ESR) must be placed between each output and the speaker to prevent destructive DC current flow through the load.

How does the STBY pin behave during power-up, and what pull-up/pull-down is required?

The STBY pin is active-low and internally weakly pulled up. To ensure defined startup, connect a 100 kΩ pull-up to V_CC for immediate enable, or a 100 kΩ pull-down for default standby. During power ramp, STBY must settle ≥100 ns before V_CC reaches 1.8 V to avoid glitch-induced pop; no external RC delay is needed if controlled by a GPIO with synchronized reset.

Is thermal pad (EP) connection mandatory, and how should it be routed on PCB?

Yes - the exposed thermal pad (EP) on the MiniSO8 package must be soldered to a dedicated copper pour tied to GND. ST recommends ≥4 thermal vias (0.3 mm diameter) connecting EP to inner ground plane, with ≥200 mm² total copper area. Omitting EP connection increases R_thJA beyond 215 °C/W, risking premature thermal shutdown at P_OUT > 400 mW.

TS4890IST Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

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-MiniSO

TS4890IST FAQ

1.How can I place an order for TS4890IST through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4890IST 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 TS4890IST reliable?

The price and inventory of TS4890IST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4890IST is usually 5 days.

3.What payment methods are accepted for TS4890IST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4890IST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4890IST?

TS4890IST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4890IST 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 TS4890IST?

For technical support, including TS4890IST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4890IST requirements.

6.How does Aetrix verify that TS4890IST is sourced from the original manufacturer or authorized distributors?

All TS4890IST 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 TS4890IST meets industry standards.

7.What is the process for return or replacement of TS4890IST?

All TS4890IST units undergo pre-shipment inspection (PSI). If there is an issue with TS4890IST, 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 TS4890IST part is unused and in its original packaging.

Return procedure for TS4890IST:

1.Submit a request within 90 days.

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

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