LM4863M/NOPB Equivalent & Substitute Parts

Part Overview

The LM4863M/NOPB is a Class AB stereo amplifier IC manufactured by Texas Instruments, designed for 2-channel audio applications with stereo headphone output capability. This device delivers 3.2W per channel at 3Ω load impedance and operates across a 2V to 5.5V supply voltage range. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for ongoing production and design requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4863M/NOPB
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Type	Class AB
Output Type	2-Channel (Stereo) with Stereo Headphones
Max Output Power @ 3Ω	3.2W x 2
Max Output Power @ 8Ω	440mW x 2
Voltage - Supply	2V ~ 5.5V
Features	Depop, Shutdown, Thermal Protection
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)

Substitute Part Grouping Explanation

Substitution of the LM4863M/NOPB is determined by the following critical parameters:

Functional Equivalence Criteria:

Class AB amplifier topology
2-Channel (Stereo) output configuration with stereo headphone capability
Output power delivery at standard load impedances (3Ω and 8Ω)
Supply voltage range compatibility
Thermal protection and shutdown features

Electrical Compatibility Requirements:

Output power specifications must meet or exceed the original device at specified load impedances
Supply voltage operating range must encompass the original range or be compatible with target application voltage
Operating temperature range must match or exceed the original specification

Physical and Compliance Considerations:

Surface mount technology maintained
RoHS3 compliance required
REACH compliance status maintained

The TPA6011A4PWP qualifies as a substitute based on matching Class AB topology, stereo 2-channel output configuration, comparable output power specifications, overlapping supply voltage range (4V ~ 5.5V subset of 2V ~ 5.5V), identical operating temperature range, and equivalent compliance certifications. The substitute device is currently in active production status, addressing the obsolescence of the original part.

Parameter Comparison

Parameter	LM4863M/NOPB	TPA6011A4PWP	Compatibility Notes
Manufacturer	Texas Instruments	Texas Instruments	Same manufacturer
Category	Linear, Amplifiers	Linear, Amplifiers	Identical category
Type	Class AB	Class AB	Identical amplifier class
Output Type	2-Channel (Stereo) with Stereo Headphones	2-Channel (Stereo) with Stereo Headphones	Identical output configuration
Max Output Power @ 3Ω	3.2W x 2	3W x 2	TPA6011A4PWP: 93.75% of original specification
Voltage - Supply	2V ~ 5.5V	4V ~ 5.5V	TPA6011A4PWP has narrower range; compatible for 4V ~ 5.5V applications
Features	Depop, Shutdown, Thermal Protection	Depop, Differential Inputs, Input Multiplexer, Mute, Shutdown, Thermal Protection, Volume Control	TPA6011A4PWP includes additional features
Mounting Type	Surface Mount	Surface Mount	Identical mounting technology
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Identical temperature range
Package / Case	16-SOIC (0.295", 7.50mm Width)	24-PowerTSSOP (0.173", 4.40mm Width)	Different package; PCB layout modification required
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical compliance
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2 (1 Year)	TPA6011A4PWP has improved moisture handling

Engineering Selection Recommendations

Substitution Feasibility:

The TPA6011A4PWP is a valid substitute for the LM4863M/NOPB in applications where the following conditions are met:

Supply Voltage Compatibility: The application supply voltage must operate within the 4V to 5.5V range. Applications requiring operation below 4V cannot use the TPA6011A4PWP without additional voltage regulation.
Output Power Requirements: The 3W output power at 3Ω load of the TPA6011A4PWP is acceptable for applications where the original 3.2W specification is not a hard requirement. The power differential is approximately 6.25% below the original specification.
Package Transition: The change from 16-SOIC to 24-PowerTSSOP packaging requires PCB layout redesign. The TPA6011A4PWP features a smaller physical footprint (0.173" versus 0.295" width) and increased pin count, necessitating schematic and layout modifications.
Feature Utilization: The TPA6011A4PWP includes differential inputs, input multiplexer, mute, and volume control functions not present in the LM4863M/NOPB. These additional features do not create incompatibility but may require firmware or control circuit adjustments if the original design does not utilize them.
Compliance Status: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence for production and distribution.
Active Production Status: The TPA6011A4PWP is in active production, eliminating obsolescence risk associated with the LM4863M/NOPB.

Frequently Asked Questions (FAQ)

Q: Can the TPA6011A4PWP directly replace the LM4863M/NOPB without PCB modifications?

A: No. The TPA6011A4PWP uses a 24-PowerTSSOP package compared to the 16-SOIC package of the LM4863M/NOPB. Pin count, spacing, and physical dimensions differ, requiring PCB layout redesign and schematic updates.

Q: What is the impact of the narrower supply voltage range (4V ~ 5.5V) of the TPA6011A4PWP?

A: The TPA6011A4PWP cannot operate below 4V. If the original application requires operation at 2V to 3.9V, the TPA6011A4PWP is not suitable. For applications operating at 4V and above, the voltage range is compatible.

Q: Is the 3W output power of the TPA6011A4PWP sufficient to replace the 3.2W specification?

A: The TPA6011A4PWP delivers 93.75% of the original output power at 3Ω load. Suitability depends on application requirements. If the design margin accommodates a 6.25% power reduction, substitution is acceptable. If the 3.2W specification is a hard requirement, alternative parts must be evaluated.

Q: What are the advantages of the TPA6011A4PWP over the LM4863M/NOPB?

A: The TPA6011A4PWP offers active production status (eliminating obsolescence), improved moisture sensitivity level (2 versus 2A, with 1-year shelf life versus 4 weeks), and additional integrated features including differential inputs, input multiplexer, mute function, and volume control.

Q: Are there pin-to-pin compatible alternatives to the LM4863M/NOPB?

A: Based on the provided substitute list, no pin-to-pin compatible alternatives are identified. The TPA6011A4PWP is the recommended substitute but requires PCB redesign due to package differences.

Q: Do both devices require the same external component values?

A: External component requirements may differ between the LM4863M/NOPB and TPA6011A4PWP due to different internal architectures and feature sets. Detailed schematic review and datasheet comparison are necessary to determine component value adjustments.

Q: What is the thermal protection feature present in both devices?

A: Both the LM4863M/NOPB and TPA6011A4PWP include integrated thermal protection that automatically limits or disables output when junction temperature exceeds safe operating limits, protecting the device from thermal damage.

Q: Can the additional features of the TPA6011A4PWP (differential inputs, multiplexer, volume control) be left unused?

A: Yes. The additional features of the TPA6011A4PWP can remain unused in the circuit design. However, proper biasing and configuration of unused pins must follow datasheet guidelines to ensure stable operation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message