LM4819MX Equivalent & Substitute Parts

Part Overview

The LM4819MX is a Class AB mono audio amplifier IC manufactured by Texas Instruments, part of the Boomer® series. This 8-SOIC surface mount device delivers 350mW output power at 16Ohm load with a supply voltage range of 2V to 5.5V. The LM4819MX is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. Substitute parts maintain functional compatibility through matching electrical specifications, package form factor, and operating parameters while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	1-Channel (Mono)
Max Output Power @ Load	350mW @ 16Ohm
Supply Voltage Range	2V to 5.5V
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C to 85°C (TA)
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution logic for the LM4819MX is based on the following criteria:

Primary Compatibility Criteria:

Amplifier Type: Class AB
Output Configuration: 1-Channel (Mono)
Package: 8-SOIC form factor
Mounting: Surface Mount
Operating Temperature Range: -40°C to 85°C
Supply Voltage: Minimum 2V operation required

Substitution Categories:

Direct Equivalent (Pin-Compatible, Same Power Output): LM4819MX/NOPB maintains identical electrical performance (350mW @ 16Ohm) with active product status and RoHS3 compliance. This part is the direct replacement with improved regulatory compliance.

Higher Power Output Substitutes (700mW @ 8Ohm Class): TPA301D, TPA301DR, TPA321D, TPA321DR, TPA701D, and TPA701DR deliver 700mW output power at 8Ohm load. These parts operate within the same supply voltage window (2.5V to 5.5V) and maintain 8-SOIC packaging. Higher output power accommodates applications requiring increased drive capability.

Enhanced Power Output Substitute (1.1W @ 8Ohm Class): TPA4861DR provides 1.1W output power at 8Ohm load with supply range 2.7V to 5.5V. This part offers maximum power delivery within the 8-SOIC package constraint.

Depop Feature Variants: TPA721DR includes depop functionality matching the LM4819MX feature set, delivering 700mW @ 8Ohm with active product status.

Last-Time-Buy Option: TPA731DR offers 700mW @ 8Ohm with differential inputs and depop features but carries Last Time Buy status, indicating limited future availability.

Parameter Comparison

Part Number	Manufacturer	Type	Output Power	Load	Supply Voltage	Features	Package	Product Status	RoHS Status
LM4819MX	Texas Instruments	Class AB	350mW	16Ohm	2V - 5.5V	Depop, Differential Inputs, Shutdown	8-SOIC	Obsolete	RoHS Non-Compliant
LM4819MX/NOPB	Texas Instruments	Class AB	350mW	16Ohm	2V - 5.5V	Depop, Differential Inputs, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA301D	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA301DR	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA321D	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA321DR	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA4861DR	Texas Instruments	Class AB	1.1W	8Ohm	2.7V - 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA701D	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA701DR	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA721DR	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Depop, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Active	RoHS3 Compliant
TPA731DR	Texas Instruments	Class AB	700mW	8Ohm	2.5V - 5.5V	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	Last Time Buy	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Compliance Upgrade: Select LM4819MX/NOPB when maintaining identical electrical performance (350mW @ 16Ohm) is required. This part provides direct pin compatibility with the obsolete LM4819MX while achieving RoHS3 compliance and active product status. Packaging options include Cut Tape and Digi-Reel formats with 9,841 units in stock.

For Higher Power Applications (700mW @ 8Ohm): TPA321DR or TPA701DR are recommended for designs requiring increased output power. TPA321DR includes differential inputs matching the LM4819MX feature set and is available in Tape & Reel packaging (3,344 units in stock). TPA701DR offers the same power output with higher inventory availability (20,400 units) in Cut Tape format. Both maintain 2.5V to 5.5V supply compatibility and RoHS3 compliance with active product status.

For Maximum Power Delivery (1.1W @ 8Ohm): TPA4861DR delivers the highest output power within the 8-SOIC package constraint. This part requires minimum 2.7V supply and is available in Cut Tape format with 31,110 units in stock. Select this option when application requirements exceed 700mW output capability.

For Depop Feature Preservation: TPA721DR maintains depop functionality present in the LM4819MX while delivering 700mW @ 8Ohm. This part is available in Tape & Reel packaging (3,355 units in stock) with active product status and RoHS3 compliance.

Avoid Last-Time-Buy Options: TPA731DR carries Last Time Buy status, indicating limited future availability. This part should be selected only when specific feature requirements (differential inputs with depop) cannot be met by active alternatives.

Frequently Asked Questions (FAQ)

Q: Can LM4819MX/NOPB be used as a direct drop-in replacement for LM4819MX?

A: Yes. LM4819MX/NOPB maintains identical electrical specifications (350mW @ 16Ohm, 2V to 5.5V supply, Class AB mono configuration) and 8-SOIC package form factor. The primary differences are active product status and RoHS3 compliance certification. Pin configuration and functional behavior are equivalent.

Q: What is the difference between TPA321DR and TPA701DR?

A: Both parts deliver 700mW @ 8Ohm with 2.5V to 5.5V supply and 8-SOIC packaging. TPA321DR includes differential inputs as a feature; TPA701DR does not. TPA701DR has significantly higher inventory availability (20,400 units versus 3,344 units). Select based on whether differential input capability is required for the application.

Q: Why do substitute parts specify 700mW @ 8Ohm instead of 350mW @ 16Ohm?

A: Output power specifications are load-dependent. The LM4819MX delivers 350mW into a 16Ohm load; substitute parts deliver 700mW into an 8Ohm load. These represent equivalent power delivery capability under different impedance conditions. Verify load impedance in your application to confirm compatibility.

Q: Is TPA4861DR compatible with designs using 2V supply voltage?

A: No. TPA4861DR requires minimum 2.7V supply, whereas LM4819MX operates from 2V. If your application uses 2V supply, select LM4819MX/NOPB or other substitutes with 2V minimum specification. TPA4861DR is suitable only for applications with 2.7V or higher supply voltage.

Q: What packaging options are available for each substitute part?

A: LM4819MX/NOPB: Cut Tape and Digi-Reel. TPA301D: Tube. TPA301DR: Cut Tape and Digi-Reel. TPA321D: Tube. TPA321DR: Tape & Reel. TPA4861DR: Cut Tape and Digi-Reel. TPA701D: Tube. TPA701DR: Cut Tape and Digi-Reel. TPA721DR: Tape & Reel. TPA731DR: Tape & Reel. Select packaging based on production volume and assembly requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification. The original LM4819MX is RoHS non-compliant. If RoHS compliance is a design requirement, select from the substitute parts provided.

Q: What is the significance of "Last Time Buy" status for TPA731DR?

A: Last Time Buy status indicates that Texas Instruments will discontinue this part after a specified date. While currently available (1,640 units in stock), future procurement will not be possible. Use TPA731DR only if specific feature requirements cannot be met by active alternatives with indefinite availability.

Q: Can I use TPA4861DR in a design originally specified for LM4819MX?

A: Electrical compatibility exists if your application can accommodate higher output power (1.1W versus 350mW) and minimum 2.7V supply requirement. Verify that the higher power output does not cause thermal or acoustic issues in your specific application. Pin configuration and 8-SOIC package are compatible.

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