LM4891ITP/NOPB Equivalent & Substitute Parts

Part Overview

The LM4891ITP/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 8Ω load and operates across a 2.2V to 5.5V supply voltage range. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain functional compatibility while meeting current component availability and compliance requirements.

Substiute Parts

LM4891ITP/NOPB

Texas InstrumentsIn Stock: 1039LM4891ITP/NOPB Datasheet

Current PartRFQ

LM4990ITLX/NOPB

Texas InstrumentsIn Stock: 7214LM4990ITLX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM4891ITP/NOPB is determined by the following critical parameters:

Functional Compatibility Criteria:

• Amplifier topology: Class AB mono configuration
• Supply voltage range: 2.2V ~ 5.5V (must be compatible)
• Output power capability: Minimum 1W at specified load impedance
• Integrated protection features: Depop and Shutdown functionality
• Thermal management: Operating temperature range -40°C ~ 85°C

Physical & Compliance Criteria:

• Surface mount packaging (BGA family)
• RoHS3 compliance
• MSL Level 1 rating
• Boomer® series alignment

The LM4990ITLX/NOPB qualifies as a manufacturer-recommended substitute based on these parameters. While it offers enhanced output power (2W @ 4Ω) and active product status, it maintains core functional compatibility through identical supply voltage range, Class AB topology, mono output configuration, and equivalent protection features.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement:

The LM4891ITP/NOPB is classified as obsolete. The LM4990ITLX/NOPB is the manufacturer-recommended substitute and carries active product status, ensuring long-term availability and supply chain continuity. Both devices maintain identical supply voltage specifications (2.2V ~ 5.5V) and Class AB mono amplifier topology, supporting direct functional substitution in most applications.

Compliance & Certification:

Both parts are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 ratings. No additional compliance barriers exist for substitution. Both devices are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Package Consideration:

The LM4990ITLX/NOPB uses a 9-WFBGA package versus the 8-UFBGA of the original part. PCB layout modifications are required to accommodate the different pin count and package footprint. Design validation is necessary prior to production implementation.

Output Power Differential:

The LM4990ITLX/NOPB delivers 2W @ 4Ω compared to 1W @ 8Ω for the LM4891ITP/NOPB. This enhanced capability does not create backward compatibility issues and provides design margin for power-demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the LM4990ITLX/NOPB directly replace the LM4891ITP/NOPB without circuit modifications?

A: Functional substitution is supported due to identical supply voltage range and Class AB mono topology. However, package differences (8-UFBGA vs. 9-WFBGA) require PCB layout redesign. Schematic compatibility is maintained.

Q: What is the primary reason for substitution?

A: The LM4891ITP/NOPB is obsolete. The LM4990ITLX/NOPB is the active equivalent from Texas Instruments, ensuring component availability and supply chain reliability.

Q: Are there thermal protection differences between these parts?

A: The LM4891ITP/NOPB includes thermal protection as a listed feature. The LM4990ITLX/NOPB specifications do not explicitly list thermal protection in the provided data. Detailed datasheets should be consulted for thermal management architecture differences.

Q: Do both parts support the same operating temperature range?

A: Yes. Both devices operate across -40°C to 85°C (TA), supporting equivalent thermal performance in target applications.

Q: What packaging formats are available for the LM4990ITLX/NOPB?

A: The LM4990ITLX/NOPB is supplied in Cut Tape (CT) and Digi-Reel® formats, with Tape & Reel (TR) packaging available. The original LM4891ITP/NOPB packaging format is not specified in the provided data.

Q: Are both parts RoHS compliant?

A: Yes. Both the LM4891ITP/NOPB and LM4990ITLX/NOPB are ROHS3 compliant with MSL Level 1 ratings, supporting equivalent environmental and regulatory requirements.