LM4873IBL Equivalent & Substitute Parts

Part Overview

The LM4873IBL is a Class AB stereo amplifier IC manufactured by Texas Instruments, designed for 2-channel stereo headphone applications. This device delivers 3W per channel at 3Ohm load and 440mW per channel at 8Ohm load, operating across a 2V to 5.5V supply voltage range. The LM4873IBL is classified as Obsolete product status, making identification of compatible substitute components essential for ongoing design support, production continuity, and system maintenance. The part integrates depop circuitry, input multiplexer, shutdown functionality, and thermal protection within a compact 20-DSBGA surface mount package.

Substiute Parts

LM4873IBL

Texas InstrumentsIn Stock: 2231LM4873IBL Datasheet

Current PartRFQ

LM49200TL/NOPB

Texas InstrumentsIn Stock: 1259LM49200TL/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM4873IBL is determined by the following critical parameters:

Primary Compatibility Criteria:

• Identical output configuration: 2-Channel (Stereo) with Stereo Headphones
• Identical amplifier class: Class AB topology
• Compatible supply voltage range: Must support the 2V ~ 5.5V operating window
• Identical mounting type: Surface Mount
• Compatible package footprint: 20-DSBGA or equivalent BGA variant
• Matching operating temperature range: -40°C ~ 85°C

Secondary Alignment Factors:

• Manufacturer: Texas Instruments (same product family ecosystem)
• Series: Boomer® (same product line)
• Compliance certifications: ROHS3, REACH Unaffected, EAR99 classification
• Moisture sensitivity level: MSL 1 or better

The LM49200TL/NOPB qualifies as a manufacturer-recommended substitute based on alignment across these parameters, despite differences in maximum output power specifications and feature set.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The LM49200TL/NOPB is designated as the manufacturer-recommended substitute for the obsolete LM4873IBL. Both devices share identical core architectural specifications: Class AB amplifier topology, 2-channel stereo headphone output configuration, surface mount delivery, and 20-pin BGA packaging. Compliance certifications align across ROHS3, REACH, and export control classifications.

Critical Design Considerations:

1. Supply Voltage Compatibility: The LM49200TL/NOPB specifies a minimum supply voltage of 2.7V, compared to the LM4873IBL's 2V minimum. Designs operating below 2.7V require verification that the substitute meets performance specifications at the intended operating point.

2. Output Power Differential: The LM49200TL/NOPB delivers 1.25W per channel at 8Ohm load, exceeding the LM4873IBL's 440mW specification. This increased output capability is compatible with existing load impedances and does not introduce incompatibility; however, thermal management and power dissipation characteristics may differ.

3. Product Status: The LM4873IBL is obsolete; the LM49200TL/NOPB is in active production. Substitution ensures long-term component availability and manufacturing support.

4. Package Footprint: Both devices use 20-pin BGA packages (DSBGA/TFBGA for LM4873IBL; DSBGA/UFBGA for LM49200TL/NOPB). PCB layout compatibility requires verification of ball grid array pitch and placement specifications.

Frequently Asked Questions (FAQ)

Q: Can the LM49200TL/NOPB directly replace the LM4873IBL without PCB modifications?

A: The LM49200TL/NOPB uses a 20-pin BGA package compatible with the LM4873IBL footprint. However, verification of ball grid array pitch and placement is required. Consult the respective datasheets for exact package dimensions and ball positions before finalizing PCB layout.

Q: What is the impact of the 2.7V minimum supply voltage on the LM49200TL/NOPB compared to the LM4873IBL's 2V minimum?

A: Designs operating at supply voltages between 2V and 2.7V cannot use the LM49200TL/NOPB without circuit modification. If your application requires operation below 2.7V, the substitute is not compatible. Verify your system's supply voltage specification before selection.

Q: Does the higher output power of the LM49200TL/NOPB (1.25W @ 8Ohm vs. 440mW @ 8Ohm) create compatibility issues?

A: No. Higher output power is compatible with existing load impedances. The substitute will deliver increased power to the same load without creating electrical incompatibility. Thermal dissipation and power supply current draw will increase; verify that the power supply and thermal design accommodate the higher power delivery.

Q: Are there feature differences between the LM4873IBL and LM49200TL/NOPB?

A: The LM49200TL/NOPB includes additional features: Differential Inputs, I2C interface, and Volume Control. The LM4873IBL includes Input Multiplexer. Both devices include Depop, Shutdown, and Thermal Protection. Designs utilizing the Input Multiplexer function of the LM4873IBL require circuit redesign to accommodate the LM49200TL/NOPB's feature set.

Q: What is the significance of the LM4873IBL's obsolete status?

A: Obsolete status indicates that Texas Instruments has discontinued production and support for this component. The LM49200TL/NOPB, classified as Active, ensures ongoing availability, manufacturing support, and compliance with current regulatory standards. Substitution is recommended for new designs and production continuity.

Q: Are compliance certifications identical between the two parts?

A: Yes. Both the LM4873IBL and LM49200TL/NOPB are ROHS3 Compliant, REACH Unaffected, and classified as EAR99 for export control purposes. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for both devices.