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

STMicroelectronics TS4900ID

Name: TS4900ID
Brand: STMicroelectronics
SKU: TS4900ID
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4900ID

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

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

Datasheet:: TS4900ID.pdf

Description:: IC AMP CLASS AB MONO 700MW 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TS4900ID from STMicroelectronics is a mono BTL audio power amplifier IC delivering 0.7W RMS into 8Ω at 5V supply with 0.1% THD+N at 200mW, ultra-low 10nA standby current, and 75dB PSRR at 217Hz - deployed in mobile handsets and portable audio devices for efficient loudspeaker drive with pop/click suppression.

For engineers reviewing the TS4900ID datasheet, TS4900ID pinout, TS4900ID application, or TS4900ID equivalent, this page provides verified circuit role (BTL Class-AB audio amplifier), exact package (SO8), thermal resistance (150°C/W), gain configuration method (external R_in/R_feed), and real-world load compatibility (4–32Ω).

Technical Context

The TS4900ID operates in bridge-tied-load (BTL) mode, generating differential output (V_OUT1, V_OUT2) with 2× voltage swing across the load - enabling 4× output power versus single-ended topology at same V_CC. It uses external resistive feedback (R_in, R_feed) to set closed-loop gain (G_v = 2 × R_feed/R_in) and supports BTL gain of 2 or 10.

It features unity-gain stability with 70° phase margin and 20dB gain margin at 8Ω/500pF load, 2MHz GBP, and internal thermal shutdown triggered at 150°C. Standby mode is active-high (V_STB ≥ V_CC − 0.5V), achieving <10nA quiescent current and <1µs wake-up response.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.5V to 5.5V - supports Li-ion battery (3.3V nominal) and USB-powered (5V) portable systems without LDO pre-regulation.
Output Power	0.7W @ 5V/8Ω/1kHz/THD=1% - sufficient for 25mm–30mm loudspeakers in smartphones and PDAs.
THD + N	0.1% @ 200mW/8Ω/20Hz–20kHz - ensures high-fidelity playback with minimal harmonic artifacts.
PSRR	75dB @ 217Hz - rejects GSM burst noise and switching regulator ripple without additional filtering.
Standby Current	10nA max - enables multi-week battery standby in always-on audio subsystems.
Thermal Resistance	150°C/W (SO8) - requires minimum 100mm² copper pour under exposed pad for full 0.7W operation at +85°C ambient.
Gain Bandwidth	2MHz - supports stable 20kHz audio bandwidth with 2× or 10× BTL gain configurations.

Pinout & Package

TS4900ID is housed in an 8-pin Small Outline (SO8) package with standard 1.27mm pitch, gull-wing leads, and no exposed thermal pad. Pin 1 is marked by notch or dot; top-view pin numbering follows counter-clockwise order.

Pin/Terminal	Circuit Role	Design Meaning
1 (STBY)	Standby control input	Active-high logic: tie to V_CC for shutdown (I_Q < 10nA); tie to GND for normal operation.
2 (BYP)	Bias voltage bypass	Connect 1µF capacitor to GND to stabilize internal half-supply reference and improve low-frequency PSRR.
3 (V_IN+)	Non-inverting input	Accepts AC-coupled audio signal; high-impedance node (typ. >1MΩ) for direct connection to codec line-out.
4 (V_IN−)	Inverting input	Connected externally to R_in and R_feed to set closed-loop gain; forms feedback network with V_OUT2.
5 (V_OUT1)	BTL output 1	Drives one side of speaker; swings ±(V_CC/2) in BTL mode - must be AC-coupled or DC-blocked before speaker.
6 (GND)	Power and signal ground	Common return for V_CC, inputs, bypass caps, and speaker - requires low-impedance PCB plane routing.
7 (V_CC)	Positive supply	Accepts 2.5–5.5V; requires 100µF bulk + 100nF ceramic bypass capacitor close to pin for THD/N performance.
8 (V_OUT2)	BTL output 2	Drives opposite speaker terminal with inverted phase; differential voltage (V_OUT2 − V_OUT1) delivers full power to load.

Key Features

Feature	Design Value
BTL output architecture	Delivers 4× more power than SE amplifiers at same V_CC; eliminates output coupling capacitor and reduces system BOM cost.
Ultra-low standby current	10nA maximum - extends battery life in voice-assistant wake-on-voice or alarm-clock applications requiring persistent audio readiness.
Pop & click suppression	Internal soft-start and controlled turn-on sequencing minimize audible transients during power-up, standby entry, and gain changes.
Unity-gain stable design	Operates reliably with external gain-setting resistors (no compensation capacitor needed) - simplifies layout and reduces component count.
Thermal shutdown protection	Auto-shutdown at 150°C junction temperature with hysteresis; resumes operation after cooldown - prevents permanent damage under overload or poor heatsinking.

Applications

Mobile Handset Audio

Portable Media Player

Use Scenario: Driving 8Ω mono loudspeaker in GSM/UMTS smartphone during voice call or ringtone playback.

IC Role / Device Role / Timing Role: BTL audio power amplifier providing 0.7W peak output with 75dB PSRR to reject 217Hz TDMA noise bursts.

Use Value: Eliminates need for external boost converter or dual-rail supply while maintaining SNR >85dB and THD+N <0.15% at rated power.

Use Scenario: Amplifying line-level audio from DAC in battery-powered MP3 player with 3.3V Li-Po supply.

IC Role / Device Role / Timing Role: Single-supply BTL amplifier delivering 300mW into 8Ω at 3.3V with 0.1% THD+N across 20Hz–20kHz.

Use Value: Enables >15-hour playback on 500mAh battery due to 5.5mA quiescent current and 10nA standby draw during pause mode.

PDA Speaker Interface

Bluetooth Speaker Baseband

Use Scenario: Driving compact 4Ω speaker in handheld PDA with space-constrained PCB and shared 3.3V rail.

IC Role / Device Role / Timing Role: Low-voltage audio amplifier supporting 4–32Ω loads, configured for G_v=2 via 22kΩ R_in/R_feed resistors.

Use Value: Delivers 0.4W into 4Ω at 3.3V with <0.2% THD+N and 70° phase margin - avoids oscillation with small ceramic output capacitors.

Use Scenario: Final-stage amplification in Class 2 Bluetooth speaker using 5V USB input and 8Ω full-range driver.

IC Role / Device Role / Timing Role: Standby-controllable BTL amplifier synchronized to BT module's enable signal for zero-power idle state.

Use Value: Reduces system standby power by 99.9% vs. always-on amplifier; wake-up latency <1µs ensures seamless audio resumption.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX9718ETA+	Higher 1.4W output @ 5V/8Ω but requires 1.8V logic interface; 25µA standby vs. TS4900ID's 10nA.	Targeted at higher-power portable speakers; lacks integrated thermal shutdown flag output.	Select when >0.7W output is required and logic-level compatibility with 1.8V host MCU is critical.
TAS5706PAG	Digital-input (I²S) Class-D amplifier; 3.3W output @ 5V/8Ω; 1.2mA quiescent current; no analog input support.	Designed for DSP-based audio systems; incompatible with analog line-in sources without external ADC.	Select only for fully digital audio pipelines; not a drop-in replacement for analog-input use cases.

Compared with MAX9718ETA+ and TAS5706PAG, TS4900ID offers the lowest standby current and simplest analog interface, making it optimal for cost-sensitive, battery-limited designs where 0.3–0.7W output suffices and thermal autonomy is essential.

Availability

TS4900ID is available at Aetrix Electronics and suitable for mobile handset audio, portable media players, PDA speaker interfaces, and Bluetooth speaker baseband circuits requiring stable component supply and long-term obsolescence management.

Supply support for TS4900ID 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 automotive, industrial, and consumer markets.

TS4900ID belongs to ST's audio power amplifier product line, engineered specifically for low-voltage, low-quiescent-current portable audio applications where BTL efficiency, pop/click suppression, and robust PSRR are mandatory.

FAQ

What is the recommended bypass capacitor for the BYP pin?

A 1µF X5R ceramic capacitor placed between BYP (pin 2) and GND is required to stabilize the internal bias voltage reference. This improves low-frequency PSRR and reduces THD+N below 1kHz. Using <1µF increases distortion at bass frequencies; >1µF yields no measurable benefit and risks instability if ESR is too low.

Can TS4900ID drive a 4Ω speaker at 5V?

Yes - TS4900ID supports 4–32Ω loads. At 5V/4Ω, it delivers up to 1.2W (THD=10%) or ~0.9W (THD=1%), but power dissipation rises significantly. Thermal derating must be applied: with SO8 package (150°C/W), continuous 0.9W requires ambient ≤55°C and ≥200mm² copper area under the IC to avoid thermal shutdown.

Is the TS4900ID pin-compatible with TS4900IS (MiniSO8)?

No - TS4900ID (SO8) and TS4900IS (MiniSO8) share identical pin functions and electrical behavior, but differ in physical dimensions and thermal characteristics. MiniSO8 has higher thermal resistance (190°C/W), limiting max continuous power to ~0.5W at +85°C ambient, whereas SO8 supports 0.7W under same conditions.

How does the standby function interact with thermal shutdown?

Standby mode (STBY = high) forces the amplifier into ultra-low-power state (<10nA), disabling all internal bias currents - including thermal sensor circuitry. Therefore, thermal shutdown is inactive during standby. Upon exit from standby (STBY = low), full functionality resumes, and thermal protection becomes immediately active.

TS4900ID Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Type:: Class AB

Output Type:: 1-Channel (Mono)

Max Output Power x Channels @ Load:: 700mW 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

TS4900ID FAQ

1.How can I place an order for TS4900ID through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4900ID 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 TS4900ID reliable?

The price and inventory of TS4900ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4900ID is usually 5 days.

3.What payment methods are accepted for TS4900ID?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4900ID transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4900ID?

TS4900ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4900ID 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 TS4900ID?

For technical support, including TS4900ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4900ID requirements.

6.How does Aetrix verify that TS4900ID is sourced from the original manufacturer or authorized distributors?

All TS4900ID 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 TS4900ID meets industry standards.

7.What is the process for return or replacement of TS4900ID?

All TS4900ID units undergo pre-shipment inspection (PSI). If there is an issue with TS4900ID, 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 TS4900ID part is unused and in its original packaging.

Return procedure for TS4900ID:

1.Submit a request within 90 days.

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

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