LM4819M/NOPB Equivalent & Substitute Parts

Part Overview

The LM4819M/NOPB is a Class AB mono audio amplifier IC manufactured by Texas Instruments, part of the Boomer® series. This device delivers 350mW output power at 16Ohm load in a compact 8-SOIC surface mount package. The LM4819M/NOPB is classified as obsolete, necessitating identification of active substitute components for new designs and production continuity. Substitute parts maintain functional compatibility through equivalent electrical specifications and identical mechanical packaging while offering enhanced features or higher output power ratings.

Key Parameters

Parameter	LM4819M/NOPB
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Amplifier Type	Class AB
Output Configuration	1-Channel (Mono)
Max Output Power @ Load	350mW @ 16Ohm
Supply Voltage Range	2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM4819M/NOPB are selected based on the following critical parameters:

Electrical Compatibility Criteria:

Amplifier Type: Class AB (maintained across all substitutes)
Output Configuration: 1-Channel (Mono) (maintained across all substitutes)
Operating Temperature Range: -40°C ~ 85°C (maintained across all substitutes)
Supply Voltage Range: Minimum 2.5V (all substitutes support this or higher)
Package Type: 8-SOIC form factor (identical across all substitutes)

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount (maintained across all substitutes)
Package Dimensions: 8-SOIC (0.154", 3.90mm Width) (identical across all substitutes)
MSL Rating: 1 (Unlimited) (maintained across all substitutes)

Regulatory Compliance:

RoHS3 Compliant (maintained across all substitutes)
REACH Unaffected (maintained across all substitutes)
ECCN: EAR99 (maintained across all substitutes)

Substitutes are grouped by output power capability and feature set. The TPA301 and TPA701 series provide 700mW output power at 8Ohm load. The TPA321 series adds differential input capability. The TPA4861 series delivers enhanced 1.1W output power. The TPA721 series includes depop functionality. All substitutes maintain active product status except TPA731DR, which is Last Time Buy.

Parameter Comparison

Part Number	Manufacturer	Type	Output Power @ Load	Supply Voltage	Package	Status	Features
LM4819M/NOPB	Texas Instruments	Class AB Mono	350mW @ 16Ohm	2V ~ 5.5V	8-SOIC	Obsolete	Depop, Differential Inputs, Shutdown
TPA301D	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Active	Short-Circuit and Thermal Protection, Shutdown
TPA301DR	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Active	Short-Circuit and Thermal Protection, Shutdown
TPA321D	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Active	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
TPA321DR	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Active	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
TPA4861D	Texas Instruments	Class AB Mono	1.1W @ 8Ohm	2.7V ~ 5.5V	8-SOIC	Active	Short-Circuit and Thermal Protection, Shutdown
TPA4861DR	Texas Instruments	Class AB Mono	1.1W @ 8Ohm	2.7V ~ 5.5V	8-SOIC	Active	Short-Circuit and Thermal Protection, Shutdown
TPA701D	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Active	Short-Circuit and Thermal Protection, Shutdown
TPA701DR	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Active	Short-Circuit and Thermal Protection, Shutdown
TPA721DR	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Active	Depop, Short-Circuit and Thermal Protection, Shutdown
TPA731DR	Texas Instruments	Class AB Mono	700mW @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Last Time Buy	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown

Engineering Selection Recommendations

For Direct Replacement (Lowest Risk): Select TPA721DR when depop functionality is required. This part maintains the depop feature present in the LM4819M/NOPB while offering active product status and enhanced thermal protection. TPA721DR is available in Tape & Reel packaging with 3,355 units in stock.

For Standard Applications: TPA701DR or TPA701D provide 700mW output power with active product status and comprehensive short-circuit and thermal protection. TPA701DR (Cut Tape & Digi-Reel) has 20,400 units in stock. TPA701D (Tube) has 1,600 units in stock. Both support the full -40°C ~ 85°C operating temperature range.

For Differential Input Requirements: TPA321DR or TPA321D maintain differential input capability equivalent to the LM4819M/NOPB. TPA321DR (Tape & Reel) has 3,344 units in stock. TPA321D (Tube) has 1,123 units in stock. Both deliver 700mW output power with active product status.

For Enhanced Power Output: TPA4861DR or TPA4861D deliver 1.1W output power at 8Ohm load, providing 3.1x power increase over the original part. TPA4861DR (Cut Tape & Digi-Reel) has 31,110 units in stock. TPA4861D (Tube) has 1,503 units in stock. Minimum supply voltage is 2.7V.

Packaging Considerations:

Tape & Reel (TR) packaging: TPA321DR, TPA721DR, TPA731DR (suitable for automated assembly)
Cut Tape & Digi-Reel (CT): TPA301DR, TPA4861DR, TPA701DR (suitable for mixed-volume production)
Tube packaging: TPA301D, TPA321D, TPA4861D, TPA701D (suitable for lower-volume applications)

All substitutes maintain ROHS3 compliance, MSL 1 rating, and identical 8-SOIC package dimensions.

Frequently Asked Questions (FAQ)

Q: Can TPA301DR directly replace LM4819M/NOPB without circuit modifications?

A: TPA301DR is electrically compatible in Class AB mono amplifier applications. Both devices operate across overlapping supply voltage ranges (2.5V ~ 5.5V for TPA301DR versus 2V ~ 5.5V for LM4819M/NOPB) and share identical 8-SOIC packaging. However, TPA301DR delivers 700mW at 8Ohm load compared to 350mW at 16Ohm for the original part. Load impedance and power requirements must be verified for your specific application.

Q: What is the difference between TPA701D and TPA701DR?

A: TPA701D and TPA701DR are functionally identical Class AB mono amplifiers with 700mW output power at 8Ohm load. The difference is packaging format: TPA701D is supplied in Tube packaging, while TPA701DR is supplied in Cut Tape & Digi-Reel format. Selection depends on production volume and assembly equipment compatibility. TPA701DR has significantly higher inventory (20,400 units) compared to TPA701D (1,600 units).

Q: Why does TPA4861 have a higher minimum supply voltage (2.7V) than other substitutes?

A: TPA4861 delivers enhanced output power of 1.1W at 8Ohm load, requiring higher minimum supply voltage of 2.7V to maintain performance specifications. If your application operates below 2.7V, select TPA301, TPA321, TPA701, or TPA721 series, which support 2.5V minimum supply voltage.

Q: Is TPA731DR suitable for new production designs?

A: TPA731DR is classified as Last Time Buy product status, indicating Texas Instruments has announced end-of-life. While currently available (1,640 units in stock), this part is not recommended for new production designs. Select active status alternatives: TPA321DR for differential input applications or TPA721DR for depop functionality.

Q: What is the significance of differential inputs in TPA321 and TPA731 series?

A: Differential input capability allows these amplifiers to accept balanced audio signals, reducing common-mode noise and improving signal integrity in audio applications. The LM4819M/NOPB includes differential inputs. TPA321 and TPA731 series maintain this feature. TPA301 and TPA701 series do not include differential inputs and are suitable for single-ended input applications only.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (TPA301, TPA321, TPA4861, TPA701, TPA721, TPA731) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the LM4819M/NOPB specifications.

Q: What is the depop feature in TPA721DR?

A: Depop (de-pop) functionality reduces audible clicking or popping sounds during power-on and power-off transitions. The LM4819M/NOPB includes depop capability. TPA721DR maintains this feature among the substitute options. If depop functionality is not required, TPA701DR offers equivalent performance at lower cost.

Q: Can I use TPA4861 in applications designed for LM4819M/NOPB?

A: TPA4861 is electrically compatible as a Class AB mono amplifier in 8-SOIC packaging. The primary difference is enhanced output power (1.1W at 8Ohm versus 350mW at 16Ohm). Verify that your load impedance and power requirements are compatible. Minimum supply voltage for TPA4861 is 2.7V; confirm your power supply meets this requirement.

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