Texas Instruments

LM4871MX/NOPB - 3W Mono Class-AB Audio Amp | Texas Instruments

Name: LM4871MX/NOPB
Brand: Texas Instruments
Price: 0.42 USD
Availability: InStock

MPN: LM4871MX/NOPB ✓ Active

In Stock Ships in 1-3 business days

2V to 5.5V Vdss 6.5mA Id SOIC-8 (D) Package

From $0.42 USD / Unit

MOQ: 1 |

Price updated: 2026-08-24

Volume Pricing

Qty	Unit Price	Extended
1	$0.85	$0.85
10	$0.75	$7.50
100	$0.6	$60.00
500	$0.5	$250.00
1,000	$0.42	$420.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for LM4871MX/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

LM4871M/NOPB

✅ Drop-In

📦 SOIC-8

Same die, tube packaging instead of tape and reel

📋 Reference alternative (not in catalog)

LM4991

✅ Drop-In

📦 SOIC-8

Higher output power (3.1W into 3Ω), similar pinout

📋 Reference alternative (not in catalog)

TPA2011D1

✅ Drop-In

📦 SOIC-8

Class-D amplifier, higher efficiency, pin-compatible

📋 Reference alternative (not in catalog)

SSM2211SZ

✅ Drop-In

📦 SOIC-8

Cross-brand, similar specs, pin-compatible

📋 Reference alternative (not in catalog)

ℹ️ 1 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

LM4871MX/NOPB Maximum Ratings & Electrical Characteristics

Output Power	3W into 3Ω at 5V, 10% THD
Supply Voltage Range	2V to 5.5V
Quiescent Current	6.5mA
Amplifier Type	Class-AB
Number of Channels	1 (Mono)
Load Impedance	3Ω (min)
THD+N	10% (max at rated power)
Shutdown Current	0.7µA (typical)
Operating Temperature Range	-40°C to 85°C
Package	SOIC-8 (D)
Mounting Type	Surface Mount
RoHS	Compliant
Lead-Free	Yes (NOPB)
Input Type	Analog
Output Type	Differential

LM4871MX/NOPB Pin Configuration

Pin 1	SHUTDOWN — Shutdown control input, active low
Pin 2	BYPASS — Bypass capacitor connection
Pin 3	VOUT- — Negative output
Pin 4	GND — Ground
Pin 5	VOUT+ — Positive output
Pin 6	VDD — Power supply
Pin 7	VIN- — Inverting input
Pin 8	VIN+ — Non-inverting input

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

LM4871MX/NOPB is suitable for 6 applications: Portable Speakers, Mobile Phones, MP3 Players, Laptop Speakers, GPS Navigation Devices, Toy and Gaming Devices.

🔧

Portable Speakers

The LM4871MX/NOPB is ideal for portable Bluetooth speakers, delivering 3W into 3Ω speakers from a 5V supply. Its low quiescent current (6.5mA) and shutdown mode (0.7µA) extend battery life. The bridged output eliminates coupling capacitors, reducing board space. With a supply range of 2V-5.5V, it works with single-cell Li-ion batteries. The SOIC-8 package is compact, and the thermal shutdown protects the device during prolonged high-power output.

Recommended

TPA2011D1 (Higher efficiency Class-D alternative) LM4991 (Higher power alternative)

📱

Mobile Phones

In mobile phones, the LM4871MX/NOPB provides loudspeaker amplification for ringtones and media playback. Its 2V-5.5V supply range accommodates battery voltage variations. The shutdown mode reduces power consumption when audio is not in use, crucial for battery life. The small SOIC-8 package fits tight PCB layouts. The differential output drives the speaker directly without DC blocking capacitors, simplifying the design and improving low-frequency response.

Recommended

LM4871M/NOPB (Tube packaging variant)

🎧

MP3 Players

The LM4871MX/NOPB is well-suited for MP3 players, delivering clean audio to headphones or small speakers. Its low quiescent current (6.5mA) and shutdown mode (0.7µA) are critical for battery-powered devices. The wide supply range (2V-5.5V) ensures operation from a single Li-ion cell. The bridged output provides twice the voltage swing, maximizing output power without increasing supply voltage. The device's small footprint and minimal external components make it ideal for compact designs.

Recommended

TPA2011D1 (Class-D alternative for higher efficiency)

🖥️

Laptop Speakers

The LM4871MX/NOPB can drive internal laptop speakers, providing up to 3W into 3Ω. Its 5V supply is readily available in laptops. The shutdown mode helps save power when audio is muted. The SOIC-8 package is easy to place on the motherboard. The device's thermal shutdown protects against overheating in confined spaces. The differential output reduces noise pickup, improving audio quality.

Recommended

LM4991 (Higher power option)

🚗

GPS Navigation Devices

In GPS devices, the LM4871MX/NOPB amplifies voice prompts and alerts. Its low power consumption (6.5mA quiescent) is essential for battery-operated units. The 2V-5.5V supply range matches typical battery voltages. The shutdown mode extends battery life during idle periods. The compact SOIC-8 package fits space-constrained designs. The bridged output drives small speakers efficiently, ensuring clear audio in noisy environments.

Recommended

LM4871M/NOPB (Tube packaging variant)

🧩

Toy and Gaming Devices

The LM4871MX/NOPB is used in toys and handheld gaming devices to produce sound effects and music. Its low cost and small size make it ideal for high-volume consumer products. The wide supply range (2V-5.5V) accommodates various battery configurations. The shutdown mode preserves battery life when the device is not in use. The device's robustness and thermal shutdown ensure reliable operation in demanding environments.

Recommended

TPA2011D1 (Class-D alternative for longer battery life)

Recommended Products Summary

TPA2011D1 Higher efficiency Class-D alternative Used in: Portable Speakers, MP3 Players, Toy and Gaming Devices LM4991 Higher power alternative Used in: Portable Speakers, Laptop Speakers LM4871M/NOPB Tube packaging variant Used in: Mobile Phones, GPS Navigation Devices

What is the output power of LM4871MX/NOPB?

The LM4871MX/NOPB delivers 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V supply. According to the TI datasheet, this is achieved using a bridged-tied load configuration. For 8Ω loads, it delivers 1.5W at 10% THD.

What is the supply voltage range of LM4871MX/NOPB?

The LM4871MX/NOPB operates from a supply voltage range of 2V to 5.5V. This wide range makes it suitable for battery-powered devices, such as portable speakers and mobile phones, where supply voltage can vary with battery charge. The quiescent current is 6.5mA typical.

Where can I buy LM4871MX/NOPB?

LM4871MX/NOPB is available from major distributors including DigiKey, Mouser, and LCSC. As of 2026-08-25, LCSC lists it at $0.3689 with 14,463 units in stock. DigiKey and Mouser also carry it with various quantity breaks. Check current availability and pricing on their websites.

What is the price of LM4871MX/NOPB?

As of 2026-08-25, the price of LM4871MX/NOPB varies by distributor and quantity. LCSC lists it at $0.3689 for single-unit purchases. DigiKey and Mouser offer tiered pricing, with lower per-unit costs at higher quantities. For example, at 1000 units, the price may drop to around $0.42.

What is the lead time for LM4871MX/NOPB?

The lead time for LM4871MX/NOPB depends on distributor stock. As of 2026-08-25, LCSC shows 14,463 units in stock, indicating immediate availability. DigiKey and Mouser typically have stock as well. For large orders, lead time may be 4-6 weeks. Contact the distributor for current lead times.

Is LM4871MX/NOPB in stock?

Yes, LM4871MX/NOPB is in stock at major distributors. As of 2026-08-25, LCSC reports 14,463 units available. DigiKey and Mouser also list it as active and in stock. For real-time inventory, check the distributor websites.

LM4871MX/NOPB vs LM4871M/NOPB - what is the difference?

The LM4871MX/NOPB and LM4871M/NOPB are functionally identical, both being 3W mono Class-AB amplifiers in SOIC-8. The difference is packaging: LM4871MX/NOPB is supplied in tape and reel, while LM4871M/NOPB is in a tube. They are pin-compatible and can be used interchangeably in most designs.

When should I choose LM4871MX/NOPB over TPA6211A1?

Choose LM4871MX/NOPB when you need a simple, low-cost mono amplifier with a wide supply range (2V-5.5V) and 3W output into 3Ω. TPA6211A1 offers higher output power (3.1W into 3Ω) and better efficiency, but may be overkill for basic portable audio. LM4871 is ideal for cost-sensitive, battery-powered designs.

What is the best drop-in replacement for LM4871MX/NOPB?

The best drop-in replacement for LM4871MX/NOPB is the LM4871M/NOPB, which is the same die in the same SOIC-8 package, differing only in packaging (tube vs tape and reel). Other pin-compatible alternatives include LM4991 and TPA2011D1, but verify pinout and parameters for your specific application.

Can LM4871MX/NOPB replace SSM2211SZ?

Yes, according to TI E2E forum, LM4871 is a TI alternative for ADI's SSM2211SZ. Both are mono Class-AB amplifiers in SOIC-8, but verify pin compatibility and electrical specs. LM4871 operates from 2V-5.5V and delivers 3W into 3Ω, while SSM2211 has similar specs. Check the datasheets for exact pinout.

Where can I download the LM4871MX/NOPB datasheet PDF?

The LM4871MX/NOPB datasheet is available from Texas Instruments at https://www.ti.com/lit/ds/symlink/lm4871.pdf. It is also hosted on datasheets.com and alldatasheet.com. The datasheet provides full specifications, pinout, and application circuits.

Where can I find the LM4871MX/NOPB pinout?

The LM4871MX/NOPB pinout is detailed in the datasheet, available from TI at https://www.ti.com/lit/ds/symlink/lm4871.pdf. The SOIC-8 package has pins for supply, ground, shutdown, and differential outputs. Refer to the datasheet for the exact pin assignments.

What are the key specifications of LM4871MX/NOPB that engineers should know?

Engineers should know that LM4871MX/NOPB is a 3W mono Class-AB amplifier with a supply range of 2V-5.5V, quiescent current of 6.5mA, and shutdown current of 0.7µA. It operates from -40°C to 85°C and comes in an SOIC-8 package. It delivers 3W into 3Ω at 10% THD and 1.5W into 8Ω.

Is LM4871MX/NOPB the same as LM4871MM/NOPB?

No, LM4871MX/NOPB is in an SOIC-8 package, while LM4871MM/NOPB is in a VSSOP-8 package. They are electrically similar but have different footprints, so they are not drop-in replacements. Choose the package that matches your PCB layout.

What is the best TI equivalent for LM4871MX/NOPB?

The best TI equivalent for LM4871MX/NOPB is the LM4871M/NOPB, which is identical except for packaging (tube vs tape and reel). Other TI alternatives include LM4991 and TPA2011D1, but they may have different pinouts or packages. Verify compatibility before substitution.

Engineering reference data for LM4871MX/NOPB — comparison, design guidance, and compliance information.

Selection Guide

Choose the LM4871MX/NOPB when you need a cost-effective, simple mono audio amplifier for battery-powered devices with a supply voltage between 2V and 5.5V. It delivers 3W into 3Ω, making it suitable for portable speakers and toys. If you require higher efficiency for extended battery life, consider the TPA2011D1 (Class-D) or LM4991 for slightly higher output power. For applications needing a smaller footprint, the LM4871MM/NOPB in VSSOP-8 is an option, but it is not pin-compatible. The SSM2211SZ from Analog Devices is a cross-brand alternative with lower output power but similar pinout. Evaluate your specific power, efficiency, and package requirements to select the best fit.

Comparison with Alternatives

Parameter	This Product	LM4871M/NOPB	LM4991	TPA2011D1	SSM2211SZ
Package	SOIC-8	SOIC-8	SOIC-8	SOIC-8	SOIC-8
Brand	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices
Output Power (3Ω)	3W	3W	3.1W	3.2W	1W
Supply Voltage Range	2V-5.5V	2V-5.5V	2V-5.5V	2.5V-5.5V	2.7V-5.5V
Quiescent Current	6.5mA	6.5mA	6.5mA	1.7mA	4mA
Amplifier Class	Class-AB	Class-AB	Class-AB	Class-D	Class-AB
Shutdown Current	0.7µA	0.7µA	0.1µA	0.5µA	10nA
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C

Key Differentiators

Wide supply voltage range (2V-5.5V) (vs SSM2211SZ)
Higher output power into 3Ω (vs SSM2211SZ)
Lower quiescent current than TPA2011D1 (vs TPA2011D1)

Design Notes

Place a 1µF bypass capacitor close to the BYPASS pin (pin 2) and a 10µF or larger capacitor on VDD (pin 6) to ensure stability and reduce power supply noise. Use a solid ground plane to minimize ground loops and improve thermal performance. Keep input traces short and shielded to avoid noise pickup.

The LM4871MX/NOPB can dissipate significant power when driving 3Ω loads at high output. At 3W output, power dissipation is approximately 1W. The SOIC-8 package has a thermal resistance of about 100°C/W, so ensure adequate copper area on the PCB for heat sinking. For continuous high-power operation, consider adding thermal vias or a heatsink.

Do not exceed the absolute maximum supply voltage of 5.5V. Ensure the shutdown pin is not left floating; tie it to VDD for normal operation or to GND for shutdown. The differential output must not be shorted to ground or to each other. Use proper ESD protection on the input pins, as the device is sensitive to electrostatic discharge.