LM4891MM/NOPB Equivalent & Substitute Parts

Part Overview

The LM4891MM/NOPB is a Class AB mono audio amplifier IC manufactured by Texas Instruments, part of the Boomer® series. This device delivers 1W output power at 8Ohm load with integrated depop, shutdown, and thermal protection features in an 8-VSSOP surface mount package. The LM4891MM/NOPB is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the original electrical specifications, mechanical form factor, and functional feature set.

Substiute Parts

LM4891MM/NOPB

Texas InstrumentsIn Stock: 817LM4891MM/NOPB Datasheet

Current PartRFQ

LM4889MM/NOPB

Texas InstrumentsIn Stock: 16999LM4889MM/NOPB Datasheet

MFR RecommendedRFQ

TPA6211A1DGN

Texas InstrumentsIn Stock: 1458TPA6211A1DGN Datasheet

MFR RecommendedRFQ

TPA6211A1DGNR

Texas InstrumentsIn Stock: 45310TPA6211A1DGNR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM4891MM/NOPB are selected based on strict electrical and mechanical compatibility criteria. The primary substitution logic follows these parameters:

Core Compatibility Requirements:

• Amplifier Type: Class AB
• Output Configuration: 1-Channel (Mono)
• Supply Voltage Range: Must encompass or match 2.2V ~ 5.5V
• Package Type: 8-VSSOP, 8-TSSOP, or 8-MSOP form factor
• Integrated Features: Depop and Shutdown functionality
• Operating Temperature: -40°C ~ 85°C
• Surface Mount capability
• RoHS3 Compliance

Substitution Categories:

Category 1 - Direct Replacement (Manufacturer Recommended): LM4889MM/NOPB maintains identical electrical specifications, output power (1W @ 8Ohm), supply voltage range (2.2V ~ 5.5V), and package form factor. This part is active status and directly replaces the obsolete LM4891MM/NOPB with no design modifications required.

Category 2 - Enhanced Performance Substitutes: TPA6211A1DGN and TPA6211A1DGNR provide increased output power capability (3.1W @ 3Ohm) while maintaining Class AB topology, mono output, compatible supply voltage (2.5V ~ 5.5V), and required protection features. These parts feature differential inputs and exposed pad packaging. Both are active status. Packaging differs (Tube for TPA6211A1DGN; Cut Tape & Digi-Reel® for TPA6211A1DGNR).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes): Select LM4889MM/NOPB. This part is manufacturer-recommended, maintains active product status, and provides identical electrical and mechanical specifications to the obsolete LM4891MM/NOPB. The LM4889MM/NOPB is available in both Cut Tape and Digi-Reel® packaging formats with substantial inventory (16927 Pcs).

For Enhanced Performance Applications: Select TPA6211A1DGNR for new designs requiring higher output power capability. This part delivers 3.1W @ 3Ohm compared to 1W @ 8Ohm, includes differential input capability, and maintains active product status. The TPA6211A1DGNR is available in Cut Tape and Digi-Reel® formats with the highest inventory level (45300 Pcs). The 8-HVSSOP package with exposed pad provides improved thermal performance.

For Tube Packaging Requirements: Select TPA6211A1DGN if tube packaging is specified. This part is functionally identical to TPA6211A1DGNR with enhanced performance specifications and active status.

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can LM4889MM/NOPB directly replace LM4891MM/NOPB without PCB modifications?

A: Yes. The LM4889MM/NOPB is the manufacturer-recommended direct replacement. Both parts share identical electrical specifications (1W @ 8Ohm, 2.2V ~ 5.5V supply), integrated features (Depop, Shutdown, Thermal Protection), and 8-VSSOP package form factor. No design changes are required.

Q: What is the key difference between LM4889MM/NOPB and TPA6211A1 series substitutes?

A: The LM4889MM/NOPB maintains the original 1W @ 8Ohm output power specification. The TPA6211A1DGN and TPA6211A1DGNR deliver higher output power (3.1W @ 3Ohm) and include differential input capability. The TPA6211A1 series uses 8-HVSSOP packaging with exposed pad for improved thermal management. Supply voltage range is 2.5V ~ 5.5V (versus 2.2V ~ 5.5V for LM4889MM/NOPB).

Q: Are there package compatibility considerations when substituting with TPA6211A1 parts?

A: Yes. The TPA6211A1 series uses 8-HVSSOP package with exposed pad, while the LM4891MM/NOPB and LM4889MM/NOPB use 8-VSSOP package. Both are 8-pin surface mount packages with 0.118" width and 3.00mm pitch, but the exposed pad on TPA6211A1 requires PCB layout modifications for thermal connection. Verify PCB footprint compatibility before substitution.

Q: Which substitute part has the best inventory availability?

A: TPA6211A1DGNR has the highest inventory level at 45300 Pcs. LM4889MM/NOPB has 16927 Pcs available. Both are active products with reliable supply status.

Q: Do all substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate across -40°C ~ 85°C (TA), matching the original LM4891MM/NOPB specification.

Q: Are there supply voltage compatibility issues when substituting?

A: The LM4889MM/NOPB maintains the original 2.2V ~ 5.5V range. The TPA6211A1 series operates at 2.5V ~ 5.5V. If your design operates below 2.5V, the LM4889MM/NOPB is required. For applications at 2.5V and above, both options are compatible.

Q: What is the significance of differential inputs on TPA6211A1 parts?

A: The TPA6211A1 series includes differential input capability, providing improved noise rejection and signal integrity compared to single-ended inputs. This feature is beneficial for audio applications requiring higher signal fidelity, but is not required for direct replacement of the LM4891MM/NOPB.