LM4879MM/NOPB Equivalent & Substitute Parts

Part Overview

The LM4879MM/NOPB is a Class AB audio power amplifier IC manufactured by Texas Instruments, designed for mono audio applications with 1.1W output power at 8Ω load. This device is part of the Boomer® series and features integrated depop, shutdown, and thermal protection functions. The part is classified as Obsolete in product status, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain compatibility across electrical specifications, thermal characteristics, and mounting requirements while meeting current availability and compliance standards.

Substiute Parts

LM4879MM/NOPB

Texas InstrumentsIn Stock: 1826LM4879MM/NOPB Datasheet

Current PartRFQ

LM4995SD/NOPB

National SemiconductorIn Stock: 7020LM4995SD/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM4879MM/NOPB is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Amplifier Type: Class AB topology required
• Channel Configuration: 1-Channel (Mono) output only
• Output Power Range: Minimum 1.1W at 8Ω load (equal or greater acceptable)
• Supply Voltage Compatibility: Operating range must encompass or overlap 2.2V – 5.5V
• Integrated Protection Features: Depop, Shutdown, and Thermal Protection functions must be present
• Operating Temperature Range: Must support −40°C to +85°C minimum
• Mounting Technology: Surface Mount only
• Package Footprint Compatibility: Physical dimensions and pin count must permit PCB layout substitution

The LM4995SD/NOPB qualifies as a manufacturer-recommended substitute based on full alignment with these criteria. Both devices operate within compatible voltage ranges, maintain identical temperature specifications, include all required protection features, and are available in surface-mount packages suitable for direct board-level replacement.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The LM4995SD/NOPB is a valid electrical substitute for the obsolete LM4879MM/NOPB based on functional equivalence across all critical parameters. Both devices are Class AB mono amplifiers with identical operating temperature ranges, integrated protection features, and compatible supply voltage specifications. The LM4995SD/NOPB delivers 1.25W output power, which exceeds the 1.1W requirement of the original part, providing additional performance margin.

Key Considerations:

1. Package Transition: The primary design modification required is PCB layout adaptation. The LM4879MM/NOPB uses a 10-pin VSSOP package, while the LM4995SD/NOPB uses an 8-pin WSON package with exposed pad. Pin count reduction and footprint changes necessitate schematic and layout review.

2. Supply Voltage Range: The LM4995SD/NOPB minimum supply voltage is 2.4V versus 2.2V for the original part. Applications operating below 2.4V require verification against actual circuit requirements.

3. Product Status & Availability: The LM4995SD/NOPB is Active status with 6,999 pieces in stock, ensuring long-term availability and production continuity compared to the Obsolete LM4879MM/NOPB.

4. Compliance: Both parts are ROHS3 Compliant and carry identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications, maintaining regulatory alignment.

Frequently Asked Questions (FAQ)

Q1: Can the LM4995SD/NOPB directly replace the LM4879MM/NOPB without PCB modification?

A: No. While electrically equivalent, the package types differ significantly. The LM4879MM/NOPB uses a 10-pin VSSOP package, and the LM4995SD/NOPB uses an 8-pin WSON package. PCB layout redesign is required, including footprint changes and potential trace routing modifications.

Q2: What is the impact of the LM4995SD/NOPB's higher output power (1.25W vs. 1.1W)?

A: The increased output power is a performance enhancement that maintains backward compatibility. Circuits designed for 1.1W operation will function correctly with the 1.25W device. Thermal management and power supply design should be verified to ensure they accommodate the higher output capability without adverse effects.

Q3: Is the LM4995SD/NOPB suitable for applications requiring 2.2V minimum supply voltage?

A: The LM4995SD/NOPB specifies a minimum supply voltage of 2.4V. Applications requiring operation at 2.2V must be evaluated against actual circuit performance. If 2.2V operation is critical, alternative substitutes or design modifications may be necessary.

Q4: Are there pin-compatible alternatives to avoid PCB redesign?

A: The provided substitute list contains only the LM4995SD/NOPB. For pin-compatible 10-pin VSSOP alternatives within the Boomer® family, additional research beyond the current dataset is required.

Q5: What are the thermal protection specifications for the LM4995SD/NOPB?

A: Both the LM4879MM/NOPB and LM4995SD/NOPB include integrated thermal protection. Specific thermal shutdown thresholds and hysteresis values are not provided in this reference. Consult the respective device datasheets for detailed thermal performance characteristics.

Q6: Can the LM4995SD/NOPB be used in existing inventory systems coded for LM4879MM/NOPB?

A: Component management systems must be updated to reflect the part number change. The different package type requires separate handling, storage, and assembly procedures. Inventory tracking should maintain distinct records for each part number.

Q7: Are there compliance or certification differences between the two parts?

A: Both parts are ROHS3 Compliant with identical ECCN and HTSUS classifications. No compliance barriers exist for substitution. Moisture Sensitivity Level (MSL) information is not provided for the LM4995SD/NOPB in this reference; consult the manufacturer datasheet for MSL specifications.