LM4860MX Equivalent & Substitute Parts

Part Overview

The LM4860MX is a Class AB audio power amplifier IC manufactured by Texas Instruments, designed for mono audio applications with 1.15W output power at 8Ω load impedance. This device operates across a 2.7V to 5.5V supply voltage range and includes integrated shutdown and thermal protection features. The LM4860MX is classified as obsolete, necessitating identification of equivalent and substitute components for new designs or production continuity. Substitute parts must maintain electrical compatibility across supply voltage, output power specifications, and thermal operating range while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Class AB	—
Output Configuration	1-Channel (Mono)	—
Max Output Power @ 8Ω	1.15W	W
Supply Voltage Range	2.7V ~ 5.5V	V
Operating Temperature Range	-20°C ~ 85°C	°C
Package Type	16-SOIC	—
Mounting Type	Surface Mount	—
Protection Features	Shutdown, Thermal Protection	—

Substitute Part Grouping Explanation

Substitute parts for the LM4860MX are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Amplifier topology: Class AB configuration
Output channels: Single-channel (mono) operation
Output power specification: Minimum 1.1W at 8Ω load
Supply voltage compatibility: 2.7V to 5.5V operating range
Package format: 16-SOIC surface mount
Protection features: Thermal protection and shutdown capability

Acceptable Variation Parameters:

Operating temperature range: Substitute parts may extend the lower temperature limit beyond -20°C
Output power: Substitute parts may deliver equal or greater output power within the same load impedance
Protection features: Substitute parts may include additional protection mechanisms (mute, short-circuit protection) beyond the minimum requirement

The LM4860MX/NOPB and TPA4860DR meet these criteria and are classified as direct substitutes.

Parameter Comparison

Parameter	LM4860MX	LM4860MX/NOPB	TPA4860DR
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments
Product Status	Obsolete	Active	Active
Amplifier Type	Class AB	Class AB	Class AB
Output Configuration	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)
Max Output Power @ 8Ω	1.15W	1.15W	1.1W
Supply Voltage Range	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V
Operating Temperature Range	-20°C ~ 85°C	-20°C ~ 85°C	-40°C ~ 85°C
Package Type	16-SOIC	16-SOIC	16-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Protection Features	Shutdown, Thermal Protection	Shutdown, Thermal Protection	Mute, Short-Circuit and Thermal Protection, Shutdown
RoHS Status	Non-compliant	Not specified	ROHS3 Compliant
Packaging Format	—	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

LM4860MX/NOPB Selection Criteria: The LM4860MX/NOPB is a direct equivalent with identical electrical specifications and operating temperature range. This part maintains active product status and is available in bulk packaging. Selection of this substitute is appropriate for applications requiring exact parameter matching with the original LM4860MX. The part is manufactured by National Semiconductor and carries the same Boomer® series designation.

TPA4860DR Selection Criteria: The TPA4860DR is a manufacturer-recommended substitute from Texas Instruments with extended operating temperature range (-40°C to 85°C) and enhanced protection features including mute and short-circuit protection. Output power specification is 1.1W at 8Ω, which meets minimum substitution requirements. This part is ROHS3 compliant and supplied in Tape & Reel format, suitable for high-volume production environments. The TPA4860DR is recommended for new designs requiring improved environmental performance and regulatory compliance.

Compliance Considerations: The LM4860MX is RoHS non-compliant. The TPA4860DR provides ROHS3 compliance for applications subject to environmental regulations. Both substitute parts maintain EAR99 export classification and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the LM4860MX/NOPB be used as a direct replacement for the LM4860MX?

A: Yes. The LM4860MX/NOPB is electrically and mechanically identical to the LM4860MX. Both parts deliver 1.15W output power at 8Ω, operate across 2.7V to 5.5V supply voltage, and use the 16-SOIC package. The primary difference is product status: LM4860MX/NOPB is active while LM4860MX is obsolete.

Q: What is the difference between the LM4860MX and TPA4860DR?

A: The TPA4860DR differs in three areas: (1) Operating temperature range extends to -40°C minimum versus -20°C for the LM4860MX; (2) Output power is specified as 1.1W at 8Ω versus 1.15W; (3) Protection features include mute and short-circuit protection in addition to thermal protection and shutdown. All other electrical parameters and the 16-SOIC package remain identical.

Q: Are all three parts pin-compatible?

A: Yes. The LM4860MX, LM4860MX/NOPB, and TPA4860DR all use the 16-SOIC package with identical pinout and footprint dimensions (0.154" width, 3.90mm).

Q: Which substitute should be selected for new production?

A: Selection depends on application requirements. For exact parameter matching and bulk supply, use LM4860MX/NOPB. For extended temperature range, enhanced protection features, and RoHS3 compliance, use TPA4860DR.

Q: Is the output power difference between LM4860MX (1.15W) and TPA4860DR (1.1W) significant?

A: The 0.05W difference represents approximately 4% variation. Both parts meet the Class AB mono amplifier specification for 8Ω loads. Compatibility depends on application power requirements; verify that 1.1W output satisfies system design specifications.

Q: What packaging formats are available for these substitutes?

A: LM4860MX/NOPB is supplied in bulk packaging. TPA4860DR is supplied in Tape & Reel (TR) format, standard for automated assembly processes.

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