LM4903MM/NOPB Equivalent & Substitute Parts

Part Overview

The LM4903MM/NOPB is a Class AB audio amplifier IC manufactured by Texas Instruments, designed for mono audio applications with 1.07W output power at 8Ω load. This device is part of the Boomer® amplifier series and operates across a 2V to 5.5V supply voltage range. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Substitute parts must maintain functional equivalence in audio amplification performance while meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Series	Boomer®
Amplifier Type	Class AB
Output Configuration	1-Channel (Mono)
Max Output Power @ 8Ω	1.07W
Supply Voltage Range	2V ~ 5.5V
Features	Depop, Shutdown, Thermal Protection
Mounting Type	Surface Mount
Package Type	8-VSSOP (8-TSSOP, 8-MSOP)
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM4903MM/NOPB is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

Amplifier topology: Class AB configuration
Output channels: 1-Channel (Mono) only
Supply voltage range: Must support 2V ~ 5.5V minimum
Output power capability: Minimum 1W at 8Ω load
Integrated protection features: Depop, Shutdown, and Thermal Protection

Mechanical & Package Requirements:

Mounting: Surface Mount only
Package: 8-VSSOP (8-TSSOP, 8-MSOP with 0.118" width, 3.00mm)
Pin count and footprint: 8-pin configuration

Compliance & Regulatory Requirements:

RoHS3 compliance mandatory
MSL rating: 1 (Unlimited moisture sensitivity)
REACH unaffected status

The LM4889MM/NOPB qualifies as a substitute based on full alignment with these parameters. Both devices share identical package specifications, feature sets, operating temperature ranges, and regulatory compliance status.

Parameter Comparison

Parameter	LM4903MM/NOPB (Main Part)	LM4889MM/NOPB (Substitute)
Manufacturer	Texas Instruments	Texas Instruments
Series	Boomer®	Boomer®
Amplifier Type	Class AB	Class AB
Output Configuration	1-Channel (Mono)	1-Channel (Mono)
Max Output Power @ 8Ω	1.07W	1W
Supply Voltage Range	2V ~ 5.5V	2.2V ~ 5.5V
Features	Depop, Shutdown, Thermal Protection	Depop, Shutdown, Thermal Protection
Mounting Type	Surface Mount	Surface Mount
Package Type	8-VSSOP	8-VSSOP
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: LM4889MM/NOPB

The LM4889MM/NOPB is the recommended substitute for the obsolete LM4903MM/NOPB. Selection is based on the following engineering criteria:

Product Status Alignment: The LM4889MM/NOPB maintains active product status with Texas Instruments, ensuring continued availability, technical support, and manufacturing consistency. The LM4903MM/NOPB obsolete status necessitates transition to an active equivalent.

Electrical Equivalence: Both devices operate as Class AB mono amplifiers with identical feature sets (Depop, Shutdown, Thermal Protection). The LM4889MM/NOPB delivers 1W output power at 8Ω, which is within 0.07W of the main part's 1.07W specification. The minimum supply voltage for the substitute is 2.2V compared to 2V for the main part; this represents a marginal difference suitable for most applications operating above 2.2V.

Package & Mechanical Compatibility: Identical 8-VSSOP packaging ensures direct footprint compatibility on existing PCB designs without layout modifications.

Regulatory & Compliance Alignment: Both parts maintain ROHS3 compliance, MSL rating 1 (Unlimited), and REACH unaffected status, ensuring no regulatory barriers to substitution.

Availability: The LM4889MM/NOPB is available in high inventory quantities (16,927 Pcs), supporting production continuity and cost-effective procurement.

Frequently Asked Questions (FAQ)

Q1: Can the LM4889MM/NOPB directly replace the LM4903MM/NOPB without PCB modifications?

A: Yes. Both devices use identical 8-VSSOP packaging with matching pin configurations and footprints. No PCB layout changes are required for direct substitution.

Q2: What is the output power difference between these two amplifiers?

A: The LM4903MM/NOPB provides 1.07W at 8Ω load, while the LM4889MM/NOPB provides 1W at 8Ω load. This 0.07W difference (approximately 6.5%) is negligible for most audio applications and falls within typical component tolerance ranges.

Q3: Is there a minimum supply voltage difference that affects circuit design?

A: The LM4903MM/NOPB operates from 2V minimum, while the LM4889MM/NOPB requires 2.2V minimum. If your application operates below 2.2V, the substitute is not suitable. For applications at or above 2.2V, both devices are equivalent.

Q4: Are the protection features identical between the two parts?

A: Yes. Both the LM4903MM/NOPB and LM4889MM/NOPB include Depop, Shutdown, and Thermal Protection features with identical functionality.

Q5: Why is the LM4903MM/NOPB classified as obsolete?

A: Product obsolescence is determined by the manufacturer based on market demand and product lifecycle management. The LM4889MM/NOPB represents the active continuation of this amplifier family within the Boomer® series.

Q6: Are there any compliance or certification differences between these parts?

A: No. Both devices maintain identical RoHS3 compliance, MSL rating 1 (Unlimited), and REACH unaffected status. No additional certifications or compliance documentation is required for substitution.

Q7: What packaging options are available for the LM4889MM/NOPB?

A: The LM4889MM/NOPB is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for both manual assembly and automated production environments.

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