TPA751DGNRG4 Equivalent & Substitute Parts

Part Overview

The TPA751DGNRG4 is a Class AB mono audio amplifier IC manufactured by Texas Instruments, designed for 700mW output power at 8Ohm load impedance. This component operates across a 2.5V to 5.5V supply voltage range and integrates differential inputs with short-circuit and thermal protection features. The device is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain functional compatibility while meeting the same electrical specifications and environmental operating conditions.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	1-Channel (Mono)
Max Output Power @ 8Ohm	700mW
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package Type	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TPA751DGNRG4 is determined by the following critical parameters:

Primary Compatibility Criteria:

Amplifier topology: Class AB configuration
Output channels: 1-Channel (Mono) only
Supply voltage range: Must encompass or match 2.5V ~ 5.5V
Operating temperature: Must support -40°C ~ 85°C range
Package footprint: 8-pin surface mount variants (8-TSSOP, 8-MSOP, 8-VSSOP, 8-MiniSO)
Compliance: ROHS3 and MSL Level 1 minimum

Secondary Compatibility Factors:

Output power capability at specified load impedance
Presence of differential inputs
Protection features (thermal, short-circuit)
Product status (active preferred for long-term availability)

The substitute parts listed below satisfy these criteria with variations in output power ratings and specific protection feature implementations.

Parameter Comparison

Parameter	TPA751DGNRG4	LM4819MM/NOPB	LM4819MMX/NOPB	LM4902MM/NOPB	TS4994IST
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active
Amplifier Type	Class AB	Class AB	Class AB	Class AB	Class AB
Output Channels	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)
Max Output Power @ 8Ohm	700mW	N/A (350mW @ 16Ohm)	N/A (350mW @ 16Ohm)	675mW	1W
Supply Voltage Range	2.5V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-HVSSOP	8-VSSOP	8-VSSOP	8-VSSOP	8-MiniSO
Differential Inputs	Yes	Yes	Yes	No	Yes
Short-Circuit Protection	Yes	No	No	No	Yes
Thermal Protection	Yes	No	No	Yes	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Power Output Replacement (700mW @ 8Ohm):

The LM4902MM/NOPB provides the closest output power specification at 675mW @ 8Ohm, operating within the same supply voltage range (2V ~ 5.5V) and temperature envelope. This part is manufactured by Texas Instruments with active product status, ensuring long-term availability and supply chain stability. The 8-VSSOP package is footprint-compatible with the original TPA751DGNRG4. Thermal protection is integrated. Note that differential inputs are not present on this variant.

For Maximum Power Capability:

The TS4994IST from STMicroelectronics delivers 1W output power @ 8Ohm, exceeding the original specification. This device maintains the 2.5V ~ 5.5V supply range, includes both differential inputs and short-circuit protection, and operates across the required temperature range. The 8-MiniSO package requires PCB layout verification for footprint compatibility. Active product status supports production continuity.

For Conservative Substitution with Differential Inputs:

The LM4819MM/NOPB and LM4819MMX/NOPB (differentiated by packaging format: Cut Tape vs. Tape & Reel) maintain differential input capability and operate within the extended supply range (2V ~ 5.5V). Output power is specified at 350mW @ 16Ohm, representing reduced power capability. These parts are suitable for applications where lower impedance loads are not required. Both variants are active products from Texas Instruments.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the original component's environmental and regulatory status. REACH and ECCN classifications remain consistent across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can the LM4819MM/NOPB directly replace the TPA751DGNRG4 in all applications?

A: The LM4819MM/NOPB is electrically compatible for Class AB mono amplification with differential inputs. However, output power is specified at 350mW @ 16Ohm, not 700mW @ 8Ohm. Substitution is valid only for applications where the lower power output and higher impedance load specification meet system requirements.

Q: What is the primary difference between LM4819MM/NOPB and LM4819MMX/NOPB?

A: Both parts are electrically identical. The difference is packaging format: LM4819MM/NOPB is supplied in Cut Tape (CT) & Digi-Reel format, while LM4819MMX/NOPB is supplied in Tape & Reel (TR) format. Selection depends on procurement and assembly process requirements.

Q: Is the TS4994IST from STMicroelectronics a suitable replacement?

A: The TS4994IST is functionally compatible as a Class AB mono amplifier with 1W output power @ 8Ohm, exceeding the original 700mW specification. It includes differential inputs, short-circuit protection, and thermal protection. The 8-MiniSO package requires verification of PCB footprint compatibility with the original 8-HVSSOP layout. Active product status ensures availability.

Q: Why does the LM4902MM/NOPB lack differential inputs?

A: The LM4902MM/NOPB is configured with single-ended inputs rather than differential inputs. This design choice affects signal conditioning requirements in the application circuit. Substitution is valid only if the system design accommodates single-ended input architecture.

Q: Are all substitute parts available in the same 8-pin surface mount package?

A: All substitute parts use 8-pin surface mount packages (8-VSSOP or 8-MiniSO), which are footprint-compatible with the original 8-HVSSOP package. However, PCB layout verification is recommended due to minor dimensional variations between package variants.

Q: What is the supply voltage compatibility range across all parts?

A: The TPA751DGNRG4 operates at 2.5V ~ 5.5V. The LM4819 and LM4902 variants support 2V ~ 5.5V (extended lower limit). The TS4994IST matches the original 2.5V ~ 5.5V range. All parts are compatible with standard 3.3V and 5V supply systems.

Q: Do all substitute parts include thermal protection?

A: Thermal protection is present on the TPA751DGNRG4, LM4902MM/NOPB, and TS4994IST. The LM4819 variants (MM/NOPB and MMX/NOPB) do not include thermal protection. Application thermal management design must account for this difference.

Q: What is the inventory status for each substitute part?

A: LM4819MM/NOPB: 2,804 pcs; LM4819MMX/NOPB: 1,900 pcs; LM4902MM/NOPB: 17,778 pcs; TS4994IST: 3,343 pcs. All parts are in active stock as new original components.

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