LM4871LDX/NOPB Equivalent & Substitute Parts

Part Overview

The LM4871LDX/NOPB is a Class AB mono audio amplifier IC manufactured by Texas Instruments, part of the Boomer® series. This device delivers 3W output power at 3Ohm load with a supply voltage range of 2V to 5.5V, integrated shutdown and thermal protection features, and is housed in an 8-WSON (4x4) surface mount package.

The LM4871LDX/NOPB is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this amplifier IC.

Substiute Parts

LM4871LDX/NOPB

Texas InstrumentsIn Stock: 10128LM4871LDX/NOPB Datasheet

Current PartRFQ

LM4991LDX/NOPB

Texas InstrumentsIn Stock: 2267LM4991LDX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM4871LDX/NOPB is determined by strict alignment of the following critical parameters:

Electrical Compatibility Criteria:

• Amplifier type: Class AB mono configuration
• Output power rating: 3W at 3Ohm load
• Supply voltage range: Must encompass or match the original 2V ~ 5.5V specification
• Operating temperature range: -40°C ~ 85°C (TA)
• Protection features: Shutdown and thermal protection

Mechanical Compatibility Criteria:

• Package type: 8-WDFN Exposed Pad (8-WSON 4x4)
• Mounting type: Surface Mount
• Pin configuration: Identical to original device

Compliance Criteria:

• RoHS3 compliance
• MSL rating: 3 (168 Hours)

The LM4991LDX/NOPB qualifies as a direct substitute based on matching all electrical output specifications, identical package geometry, equivalent protection features, and identical compliance certifications. The substitute part maintains full functional and mechanical interchangeability with the original LM4871LDX/NOPB.

Parameter Comparison

Engineering Selection Recommendations

LM4991LDX/NOPB as Primary Substitute:

The LM4991LDX/NOPB is the manufacturer-recommended substitute for the obsolete LM4871LDX/NOPB. This substitution is supported by:

• Identical electrical output specifications (3W @ 3Ohm, Class AB mono)
• Matching supply voltage range (2.2V ~ 5.5V encompasses the original 2V ~ 5.5V specification)
• Identical package geometry and pin configuration (8-WDFN Exposed Pad, 8-WSON 4x4)
• Equivalent thermal and shutdown protection features
• Additional depop feature in the substitute part
• Identical operating temperature range (-40°C ~ 85°C)
• Equivalent RoHS3 compliance and MSL rating
• Active product status ensuring ongoing availability and supply chain support

The LM4991LDX/NOPB is available in Tape & Reel (TR) packaging format with 2200 units in current inventory stock.

Frequently Asked Questions (FAQ)

Q: Can the LM4991LDX/NOPB directly replace the LM4871LDX/NOPB in existing designs?

A: Yes. The LM4991LDX/NOPB is electrically and mechanically compatible with the LM4871LDX/NOPB. Both devices share identical output power ratings, package geometry, pin configuration, and operating specifications. No circuit modifications are required for substitution.

Q: What is the difference in supply voltage range between these parts?

A: The LM4871LDX/NOPB operates from 2V to 5.5V, while the LM4991LDX/NOPB operates from 2.2V to 5.5V. The substitute part's minimum supply voltage is 0.2V higher. For applications operating above 2.2V, this difference is not a limiting factor. For applications requiring operation below 2.2V, the original specification must be verified against actual circuit requirements.

Q: Are the package and mounting specifications identical?

A: Yes. Both the LM4871LDX/NOPB and LM4991LDX/NOPB use the 8-WDFN Exposed Pad package in 8-WSON (4x4) configuration with surface mount mounting type. PCB footprints and assembly processes remain unchanged.

Q: What additional features does the LM4991LDX/NOPB include?

A: The LM4991LDX/NOPB includes a depop feature in addition to the shutdown and thermal protection features present in the LM4871LDX/NOPB. The depop function reduces audible artifacts during power-on and power-off transitions.

Q: Why is the LM4871LDX/NOPB classified as obsolete?

A: The LM4871LDX/NOPB has reached end-of-life status. The LM4991LDX/NOPB is the active replacement part, ensuring continued product support and supply availability for new designs and legacy product maintenance.

Q: Are compliance certifications equivalent between these parts?

A: Yes. Both parts maintain ROHS3 compliance, identical MSL rating of 3 (168 Hours), REACH Unaffected status, and identical ECCN and HTSUS classifications.