LM4755TS/NOPB Equivalent & Substitute Parts

Part Overview

The LM4755TS/NOPB is a 2-channel stereo Class AB amplifier IC manufactured by Texas Instruments, housed in a DDPAK/TO-263-9 surface mount package. This device delivers 11W per channel at 4Ω load and operates across a 9V to 32V supply voltage range. The amplifier integrates mute, short-circuit, and thermal protection features, making it suitable for audio amplification applications requiring moderate power output.

The LM4755TS/NOPB is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, and long-term system support. Identifying compatible alternatives ensures access to active, supported components with equivalent or enhanced performance characteristics.

Substiute Parts

LM4755TS/NOPB

Texas InstrumentsIn Stock: 820LM4755TS/NOPB Datasheet

Current PartRFQ

TPA3110D2PWP

Texas InstrumentsIn Stock: 2738TPA3110D2PWP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM4755TS/NOPB is determined by the following critical parameters:

Functional Equivalence Criteria:

• 2-channel stereo amplifier configuration
• Surface mount technology
• Integrated protection mechanisms (short-circuit and thermal protection)
• Operating temperature range compatibility (-40°C ~ 85°C)

Performance Compatibility Criteria:

• Output power rating (minimum 11W per channel or higher)
• Supply voltage range overlap or compatibility (9V ~ 32V nominal operation)
• Electrical specifications suitable for audio amplification applications

Regulatory & Compliance Criteria:

• RoHS compliance status for new designs
• REACH and ECCN classifications alignment

The TPA3110D2PWP qualifies as a substitute based on these parameters. While it employs Class D amplification (versus the original Class AB topology), it maintains 2-channel stereo output, surface mount packaging, integrated protection features, compatible supply voltage range, and active product status with full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The LM4755TS/NOPB is obsolete, limiting availability for new production and long-term support. The TPA3110D2PWP carries active product status, ensuring ongoing availability, technical support, and manufacturing continuity.

Compliance & Regulatory Status: The LM4755TS/NOPB is RoHS non-compliant, which restricts its use in applications subject to RoHS3 regulations. The TPA3110D2PWP is ROHS3 compliant, meeting current regulatory requirements for electronics manufacturing and distribution in regulated markets.

Electrical Performance: Both devices operate within compatible temperature ranges (-40°C ~ 85°C). The TPA3110D2PWP delivers higher output power (15W x 2 @ 8Ω) compared to the LM4755TS/NOPB (11W x 2 @ 4Ω), providing performance headroom for audio applications. Supply voltage ranges overlap substantially (8V ~ 26V for TPA3110D2PWP versus 9V ~ 32V for LM4755TS/NOPB), with the substitute supporting the critical 9V to 26V operating window.

Protection & Reliability: Both devices integrate short-circuit and thermal protection. The TPA3110D2PWP adds a shutdown feature and removes the mute function. Circuit design must accommodate this functional difference.

Packaging Consideration: The TPA3110D2PWP uses 28-HTSSOP packaging versus the DDPAK/TO-263-9 of the original part. PCB layout and thermal management designs require revision to accommodate the different package footprint and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can the TPA3110D2PWP directly replace the LM4755TS/NOPB without PCB modifications?

A: No. The TPA3110D2PWP uses 28-HTSSOP packaging, while the LM4755TS/NOPB uses DDPAK/TO-263-9. PCB footprint, pinout, and thermal management designs must be revised. Pin-to-pin compatibility does not exist between these packages.

Q: What is the primary difference between Class AB and Class D amplification in this substitution?

A: The LM4755TS/NOPB uses Class AB topology, while the TPA3110D2PWP uses Class D. Class D amplifiers typically offer higher efficiency and lower heat dissipation. Circuit design, power supply filtering, and output filtering requirements differ between topologies.

Q: Does the TPA3110D2PWP support the mute function of the LM4755TS/NOPB?

A: No. The TPA3110D2PWP provides a shutdown feature instead of a dedicated mute function. Application firmware or control logic must be adapted to use the shutdown pin for audio control requirements.

Q: Are the supply voltage ranges compatible?

A: Substantially compatible. The TPA3110D2PWP operates from 8V to 26V, while the LM4755TS/NOPB operates from 9V to 32V. The overlap range is 9V to 26V. Applications requiring operation above 26V cannot use the TPA3110D2PWP.

Q: What are the moisture sensitivity implications for assembly and storage?

A: Both devices carry MSL 3 (168 Hours) ratings. Identical moisture handling, storage, and reflow procedures apply to both components. No additional precautions are required when transitioning between parts.

Q: Is the TPA3110D2PWP suitable for RoHS-regulated applications?

A: Yes. The TPA3110D2PWP is ROHS3 compliant, meeting regulatory requirements for RoHS-restricted markets. The LM4755TS/NOPB is non-compliant and unsuitable for RoHS-regulated applications.

Q: What thermal management differences exist between these packages?

A: The DDPAK/TO-263-9 and 28-HTSSOP packages have different thermal characteristics. Thermal modeling, heatsink design, and PCB copper area allocation must be recalculated for the TPA3110D2PWP to ensure adequate heat dissipation at rated power levels.