LM4873MTX Equivalent & Substitute Parts

Part Overview

The LM4873MTX 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 LM4873MTX is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain identical electrical performance, thermal characteristics, and functional feature sets while offering current market availability.

Substiute Parts

LM4873MTX

Texas InstrumentsIn Stock: 2950LM4873MTX Datasheet

Current PartRFQ

LM4873MTEX/NOPB

Texas InstrumentsIn Stock: 2470LM4873MTEX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM4873MTX is determined by strict equivalence across the following critical parameters:

Electrical Performance Criteria:

• Class AB amplifier topology
• 2-channel stereo output configuration with headphone drive capability
• Output power specifications: 3W @ 3Ohm and 440mW @ 8Ohm per channel
• Supply voltage range: 2V to 5.5V
• Integrated feature set: Depop, Input Multiplexer, Shutdown, Thermal Protection

Environmental & Compliance Criteria:

• Operating temperature range: -40°C to 85°C
• RoHS3 compliance status
• MSL 1 rating
• REACH unaffected status

Packaging Criteria:

• Surface mount technology
• 20-pin TSSOP or equivalent thermal TSSOP package variants
• Pin-compatible package footprints

The LM4873MTEX/NOPB qualifies as a direct substitute based on identical electrical specifications, feature set, and compliance certifications. The primary distinction is packaging format (Tape & Reel versus bulk) and product status transition from obsolete to active.

Parameter Comparison

Engineering Selection Recommendations

The LM4873MTEX/NOPB is the direct substitute for the obsolete LM4873MTX. Selection is based on the following engineering criteria:

Product Status: The LM4873MTX is classified as obsolete, while the LM4873MTEX/NOPB maintains active product status with current manufacturing support from Texas Instruments.

Electrical Equivalence: Both parts share identical electrical specifications, output power ratings, supply voltage range, and integrated feature sets. No functional differences exist in amplifier performance or thermal characteristics.

Compliance & Certifications: Both parts maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status, ensuring regulatory compatibility across manufacturing environments.

Package Compatibility: The LM4873MTEX/NOPB uses a 20-PowerTSSOP (20-HTSSOP) package variant with identical pin configuration and footprint dimensions (0.173" x 4.40mm width) to the original 20-TSSOP package. PCB layouts and thermal management designs require no modification.

Packaging Format: The primary distinction is delivery format. The LM4873MTEX/NOPB is supplied in Tape & Reel format, standard for production environments. Bulk packaging availability should be confirmed with the supplier for specific procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM4873MTEX/NOPB be used as a direct replacement for the LM4873MTX in existing designs?

A: Yes. The LM4873MTEX/NOPB is electrically and functionally identical to the LM4873MTX. No circuit modifications, PCB layout changes, or firmware updates are required. Both parts operate identically across the 2V to 5.5V supply range and deliver identical output power specifications at 3Ohm and 8Ohm loads.

Q: Are there package compatibility concerns between the 20-TSSOP and 20-PowerTSSOP variants?

A: No. Both packages maintain identical pin configurations, footprint dimensions (0.173" x 4.40mm width), and thermal characteristics. PCB designs, solder reflow profiles, and thermal management strategies require no modification.

Q: What is the significance of the product status change from obsolete to active?

A: The LM4873MTX is no longer manufactured by Texas Instruments. The LM4873MTEX/NOPB is the active equivalent with ongoing production support, ensuring long-term availability, consistent quality, and access to technical documentation and support resources.

Q: Does the Tape & Reel packaging format affect component performance?

A: No. Tape & Reel is a standard production packaging format that does not affect electrical performance, thermal characteristics, or reliability. It is the standard delivery method for high-volume manufacturing environments.

Q: Are there any thermal or reliability differences between these parts?

A: No. Both parts share identical thermal protection features, operating temperature ranges (-40°C to 85°C), and MSL 1 ratings. Thermal management and reliability characteristics are equivalent.

Q: What compliance certifications apply to both parts?

A: Both the LM4873MTX and LM4873MTEX/NOPB are ROHS3 compliant, REACH unaffected, and carry MSL 1 moisture sensitivity ratings. No compliance differences exist between the two parts.