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

STMicroelectronics TS4871IST

Name: TS4871IST
Brand: STMicroelectronics
SKU: TS4871IST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4871IST

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

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

Datasheet:: TS4871IST.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:6,435

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Product details

Overview

TS4871IST from STMicroelectronics is a mono rail-to-rail audio power amplifier delivering 1 W RMS into 8 Ω at 5 V supply, with 0.1% THD+N at 250 mW output, ultra-low 10 nA standby current, and 75 dB PSRR at 217 Hz - designed for portable audio output stages in space-constrained mobile handsets and notebooks.

For engineers reviewing the TS4871IST datasheet, TS4871IST pinout, TS4871IST application, or TS4871IST equivalent, this page provides verified circuit role, MiniSO-8 package mapping, thermal shutdown behavior, gain configuration method, and real-world audio performance trade-offs across 2.6–5.5 V operation.

Technical Context

The TS4871IST integrates a unity-gain-stable Class-AB output stage with internal thermal shutdown (trip at 150 °C) and external standby control via dedicated STBY pin. It operates over 2.5–5.5 V supply while maintaining stable phase margin (70°) and gain margin (20 dB) into 8 Ω loads with 500 pF capacitive load.

Its rail-to-rail output swing enables full utilization of low-voltage supplies, and its PSRR of 75 dB at 217 Hz suppresses GSM noise coupling. Gain is set externally using resistor pairs (R_in/R_feed), supporting closed-loop gains of 2× or 10× in BTL configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	1 W RMS @ 5 V, 8 Ω, THD = 1%, 1 kHz - sufficient to drive small speakers without external boost stages
THD + N	0.15% @ 250 mW, 8 Ω, 20 Hz–20 kHz - preserves audio fidelity in voice and media playback
Supply Range	2.5 V to 5.5 V - supports Li-ion, Li-poly, and dual-cell alkaline battery systems directly
Standby Current	10 nA typical - enables >1-year battery shelf life in always-on portable devices
PSRR	75 dB @ 217 Hz - rejects cellular baseband ripple without additional LDO filtering
Phase Margin	70° @ unity gain, 8 Ω + 500 pF - ensures stability with common ceramic output coupling caps
Gain Bandwidth	2 MHz - supports flat frequency response up to 20 kHz with 2× gain configuration

Pinout & Package

TS4871IST is housed in a MiniSO-8 surface-mount package (3.0 mm × 3.0 mm, 0.95 mm height, 0.65 mm pitch), optimized for compact PCB layouts in handheld audio subsystems.

Pin/Terminal	Circuit Role	Design Meaning
1 (STBY)	Standby control input	Logic-high (V_CC − 0.5 V to V_CC) disables amplifier; logic-low (GND to 0.5 V) enables operation
2 (IN+)	Non-inverting input	Accepts single-ended audio signal; referenced to GND or half-supply depending on bypass capacitor configuration
3 (IN−)	Inverting input	Connected to feedback network (R_feed) to set closed-loop gain; high-impedance node
4 (VOUT)	Amplifier output	Rail-to-rail voltage source driving speaker load directly; requires AC-coupling capacitor to speaker
5 (GND)	Analog ground reference	Common return for input, feedback, and output paths; must be low-impedance plane
6 (V_CC)	Positive supply rail	Accepts 2.5–5.5 V; requires 100 µF bulk bypass capacitor per datasheet layout guidelines
7 (BYP)	Half-supply bypass	Connects to 1 µF capacitor to generate internal virtual ground for single-supply operation
8 (NC)	No connect	Internally unused; left floating or tied to GND per PCB layout best practice

Key Features

Feature	Design Value
Rail-to-rail output	Delivers full dynamic range from 0 V to V_CC, maximizing SNR in low-voltage battery-powered systems
Ultra-low standby current	10 nA enables true "off-mode" power gating in always-listening voice interfaces
Thermal shutdown protection	Internal sensor disables output at 150 °C junction temperature, preventing permanent damage during overload
Unity-gain stable architecture	Eliminates need for external compensation components when configured for G = 1, simplifying BOM
High PSRR at 217 Hz	75 dB rejection of GSM switching noise allows direct connection to noisy shared power rails

Applications

Mobile Handset Audio

Notebook Speaker Driver

Use Scenario: Driving mono earpiece or loudspeaker in LTE/5G smartphones with single-cell Li-ion supply.

IC Role / Device Role / Timing Role: Final-stage audio power amplifier operating in single-supply mode with integrated bypass reference.

Use Value: 1 W output at 5 V eliminates need for external DC-DC boost, reducing bill-of-materials and board area.

Use Scenario: Amplifying stereo channel (per-channel TS4871IST) in ultraportable laptops with 3.3 V system rail.

IC Role / Device Role / Timing Role: Low-quiescent-current audio driver enabling >10-hour battery life during media playback.

Use Value: 0.15% THD+N at 250 mW ensures clear voice and music reproduction without audible distortion.

PDA Media Playback

Portable Bluetooth Speaker

Use Scenario: Audio output in legacy PDAs with 2.6–3.3 V battery operation and space-limited PCB.

IC Role / Device Role / Timing Role: Single-chip mono amplifier with standby control synchronized to UI sleep/wake events.

Use Value: 260 mW output at 2.6 V meets loudness requirements while maintaining <10 nA off-state leakage.

Use Scenario: Compact mono speaker module powered by dual AA/AAA batteries or USB 5 V input.

IC Role / Device Role / Timing Role: High-efficiency Class-AB output stage with rail-to-rail swing minimizing headroom loss.

Use Value: 75 dB PSRR prevents audible GSM-like buzz during wireless transmission bursts.

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, but 1.2 µA standby current - 120× higher than TS4871IST	Better for high-volume speaker apps; unsuitable for multi-year battery life designs	Select when peak output >1 W is required and standby current is secondary
TFA9894UK/N1	Digital-input Class-D amplifier with I²S interface; no analog input pins or external gain resistors	Requires digital audio source; incompatible with analog line-out or DAC outputs	Select only for new designs with digital audio path and strict efficiency targets

Compared with MAX9718ETA+ and TFA9894UK/N1, the TS4871IST uniquely balances ultra-low standby consumption, analog flexibility, and rail-to-rail output in a MiniSO-8 footprint - making it optimal for cost-sensitive, battery-constrained portable audio where analog signal chain integration is mandatory.

Availability

TS4871IST is available at Aetrix Electronics and suitable for mobile handset audio, notebook speaker drivers, PDA media playback, and portable Bluetooth speaker designs requiring stable component supply across long production lifecycles.

Supply support for TS4871IST 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The TS4871IST belongs to ST's audio power amplifier product line, engineered specifically for low-voltage portable electronics where minimal quiescent power, small footprint, and robust GSM noise immunity are critical design constraints.

FAQ

What is the minimum recommended supply voltage for stable operation?

The TS4871IST guarantees full specification compliance down to 2.5 V supply. At 2.6 V, it delivers 260 mW into 8 Ω at 1% THD; operation below 2.5 V risks output clipping, reduced PSRR, and potential instability due to insufficient headroom for internal biasing circuits.

Can the TS4871IST drive a 4 Ω speaker load?

Yes - the datasheet specifies operation with 4–32 Ω loads. At 5 V, it delivers 1.4 W into 4 Ω (THD = 1%, 1 kHz), but thermal derating must be applied: maximum ambient temperature drops to ~65 °C per Figure 21 due to higher power dissipation.

How is gain configured, and what resistor values are recommended for G = 2?

Gain is set by external R_in (inverting input to GND) and R_feed (output to inverting input). For G = 2, use R_in = R_feed = 22 kΩ (per Table 6); tolerance ≤1% is recommended to minimize gain error and maintain THD performance.

Does the TS4871IST require an output coupling capacitor?

Yes - the output is DC-coupled internally but must be AC-coupled to the speaker via a series capacitor (typically 220–470 µF) to block residual offset voltage (5–20 mV) and prevent speaker coil damage or audible pop during power-up.

TS4871IST 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

TS4871IST FAQ

1.How can I place an order for TS4871IST through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4871IST 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 TS4871IST reliable?

The price and inventory of TS4871IST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4871IST is usually 5 days.

3.What payment methods are accepted for TS4871IST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4871IST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4871IST?

TS4871IST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4871IST 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 TS4871IST?

For technical support, including TS4871IST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4871IST requirements.

6.How does Aetrix verify that TS4871IST is sourced from the original manufacturer or authorized distributors?

All TS4871IST 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 TS4871IST meets industry standards.

7.What is the process for return or replacement of TS4871IST?

All TS4871IST units undergo pre-shipment inspection (PSI). If there is an issue with TS4871IST, 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 TS4871IST part is unused and in its original packaging.

Return procedure for TS4871IST:

1.Submit a request within 90 days.

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

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