LM4819M Equivalent & Substitute Parts

Part Overview

The LM4819M is a Class AB mono amplifier IC manufactured by Texas Instruments, designed for audio amplification applications with 350mW output power at 16Ohm load impedance. The device operates across a 2V to 5.5V supply voltage range and features depop functionality, differential inputs, and shutdown capability in an 8-SOIC surface mount package.

The LM4819M is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production and legacy system support.

Key Parameters

Parameter	LM4819M Value
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Type	Class AB
Output Type	1-Channel (Mono)
Max Output Power @ Load	350mW @ 16Ohm
Voltage - Supply	2V ~ 5.5V
Features	Depop, Differential Inputs, Shutdown
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM4819M is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Amplifier type: Class AB mono (1-channel)
Package: 8-SOIC form factor with identical 0.154" (3.90mm) width
Mounting: Surface mount technology
Operating temperature range: -40°C to 85°C
Supply voltage overlap: Minimum 2V to 5.5V range

Output Power Considerations: The LM4819M delivers 350mW at 16Ohm load. Substitute parts are grouped by output power capability at 8Ohm load impedance, which represents a different load condition. Parts with equal or greater output power at 8Ohm load are electrically compatible for applications requiring the original 350mW specification at 16Ohm.

Feature Matching: Substitute parts must retain core functionality including shutdown capability. Differential inputs and depop features are present in select substitute options but are not mandatory for basic substitution.

Compliance Status: All active substitute parts are RoHS3 compliant, representing an improvement over the obsolete, non-compliant LM4819M.

Parameter Comparison

Part Number	Manufacturer	Type	Output Power @ Load	Supply Voltage	Features	Package	Operating Temp	Product Status	RoHS Status
LM4819M	Texas Instruments	Class AB	350mW @ 16Ohm	2V ~ 5.5V	Depop, Differential Inputs, Shutdown	8-SOIC	-40°C ~ 85°C	Obsolete	RoHS non-compliant
TPA301D	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA301DR	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA321D	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA321DR	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA4861D	Texas Instruments	Class AB	1.1W @ 8Ohm	2.7V ~ 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA4861DR	Texas Instruments	Class AB	1.1W @ 8Ohm	2.7V ~ 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA701D	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA701DR	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA721DR	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Depop, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Active	ROHS3 Compliant
TPA731DR	Texas Instruments	Class AB	700mW @ 8Ohm	2.5V ~ 5.5V	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown	8-SOIC	-40°C ~ 85°C	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes for Active Production:

The TPA301DR, TPA701DR, and TPA4861DR are recommended as primary substitutes due to active product status and RoHS3 compliance. These parts are available in high inventory quantities and support long-term design continuity.

Feature-Matched Substitutes:

For applications requiring differential inputs and depop functionality matching the LM4819M feature set, the TPA321DR and TPA731DR provide equivalent feature parity. TPA321DR is preferred for new designs due to active status; TPA731DR is available but classified as Last Time Buy.

Higher Output Power Option:

The TPA4861D and TPA4861DR deliver 1.1W output power at 8Ohm load, providing increased headroom for power-demanding applications. These parts require a minimum 2.7V supply voltage compared to the LM4819M's 2V minimum.

Packaging Considerations:

All substitute parts are available in multiple packaging formats (Tube, Cut Tape & Digi-Reel, Tape & Reel). Selection depends on procurement volume and assembly requirements. The "DR" suffix indicates Tape & Reel packaging suitable for high-volume automated assembly.

Compliance Status:

All active substitute parts meet ROHS3 compliance requirements, addressing the non-compliant status of the obsolete LM4819M. This compliance improvement is mandatory for new product designs and many regulated markets.

Frequently Asked Questions (FAQ)

Q: Can the TPA301DR directly replace the LM4819M in existing designs?

A: The TPA301DR is electrically compatible within the 8-SOIC package footprint. The supply voltage range shifts from 2V minimum to 2.5V minimum. Designs operating below 2.5V require alternative substitutes. Output power specifications differ by load impedance; verify load conditions in your application.

Q: What is the difference between TPA321D and TPA321DR?

A: Both parts are identical in electrical specifications and features. The difference is packaging format: TPA321D is supplied in Tube packaging, while TPA321DR is supplied in Tape & Reel format. Selection depends on procurement volume and assembly process requirements.

Q: Why do substitute parts specify output power at 8Ohm instead of 16Ohm?

A: Output power ratings are standardized at 8Ohm load impedance across the substitute part family. The LM4819M's 350mW at 16Ohm represents a different load condition. Verify your application's actual load impedance to ensure adequate power delivery.

Q: Is the TPA4861DR suitable for all LM4819M applications?

A: The TPA4861DR provides higher output power (1.1W at 8Ohm) and is compatible with the 8-SOIC package. However, the minimum supply voltage is 2.7V, which may not be compatible with designs requiring 2V operation. Confirm supply voltage requirements before substitution.

Q: Which substitute part best matches the LM4819M feature set?

A: The TPA321DR provides the closest feature match, including differential inputs and depop functionality. It is available in active status with RoHS3 compliance. The TPA731DR offers identical features but is classified as Last Time Buy, making it less suitable for new long-term designs.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are RoHS3 compliant. The obsolete LM4819M is RoHS non-compliant. Compliance status is a critical consideration for new product designs and regulated markets.

Q: What inventory levels are available for substitute parts?

A: Inventory quantities vary by part number and packaging format. TPA701DR has the highest inventory at 20,400 pieces. TPA4861DR has 31,110 pieces available. Verify current inventory status with your supplier for procurement planning.

Q: Can I use TPA701D instead of TPA701DR?

A: Both parts have identical electrical specifications. TPA701D is supplied in Tube packaging (1,600 pieces in stock), while TPA701DR is supplied in Tape & Reel format (20,400 pieces in stock). Choose based on your assembly process and volume requirements.

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