LM4874MH/NOPB Equivalent & Substitute Parts

Part Overview

The LM4874MH/NOPB is a Class AB stereo amplifier IC manufactured by Texas Instruments, designed for 2-channel audio applications. This device delivers 2.6W per channel at 3Ohm load impedance and operates across a 3V to 5.5V supply voltage range. The part is classified as obsolete, necessitating identification of active alternative components that maintain functional and electrical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	2-Channel (Stereo)
Max Output Power per Channel @ 3Ohm	2.6W
Supply Voltage Range	3V ~ 5.5V
Package Type	20-PowerTSSOP (0.173", 4.40mm Width)
Operating Temperature Range	-40°C ~ 85°C
Key Features	Depop, Differential Inputs, Shutdown, Thermal Protection
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the LM4874MH/NOPB is determined by the following criteria:

Primary Compatibility Requirements:

Amplifier topology: Class AB
Output configuration: 2-Channel (Stereo)
Package footprint: 20-HTSSOP or compatible 20-pin TSSOP variant
Operating temperature range: -40°C ~ 85°C minimum
Surface mount capability

Secondary Compatibility Factors:

Supply voltage range overlap with 3V ~ 5.5V specification
Output power capability at specified load impedance
Presence of core protection features (Depop, Shutdown)

The identified substitute parts maintain the same package footprint and core amplifier architecture. Variations in maximum output power and minimum supply voltage represent acceptable trade-offs for applications where the LM4874MH/NOPB is no longer available. All substitute parts are active products with current manufacturing status.

Parameter Comparison

Parameter	LM4874MH/NOPB	TPA6017A2PWPR	TPA6017A2PWP	BD7836EFV-E2
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Rohm Semiconductor
Product Status	Obsolete	Active	Active	Active
Amplifier Type	Class AB	Class AB	Class AB	Class AB
Output Configuration	2-Channel (Stereo)	2-Channel (Stereo)	2-Channel (Stereo)	2-Channel (Stereo)
Max Output Power @ Load	2.6W x 2 @ 3Ohm	2W x 2 @ 3Ohm	2W x 2 @ 3Ohm	1.9W x 2 @ 4Ohm
Supply Voltage Range	3V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Package Type	20-PowerTSSOP	20-PowerTSSOP	20-PowerTSSOP	20-VSSOP Exposed Pad
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	2 (1 Year)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

TPA6017A2PWPR and TPA6017A2PWP (Texas Instruments)

Both TPA6017A2 variants are active products from the original manufacturer, providing direct design continuity. These parts maintain identical package geometry and pinout compatibility with the LM4874MH/NOPB. The output power specification of 2W per channel at 3Ohm represents a 23% reduction from the original part; however, this remains suitable for applications not requiring maximum power output. The minimum supply voltage increases to 4.5V, eliminating compatibility with 3V-only systems. Both variants include Depop, Differential Inputs, and Shutdown features. The primary distinction is packaging: TPA6017A2PWPR is supplied in Cut Tape and Digi-Reel format, while TPA6017A2PWP is supplied in Tube format. Moisture sensitivity level is rated at 2 (1 Year), requiring standard handling protocols.

BD7836EFV-E2 (Rohm Semiconductor)

The BD7836EFV-E2 provides an alternative from a different manufacturer with active product status. This part uses a 20-VSSOP package variant with exposed pad, maintaining the same 0.173" width and 4.40mm footprint. Output power is specified at 1.9W per channel at 4Ohm load, representing the lowest power rating among substitutes. The supply voltage range matches the TPA6017A2 variants at 4.5V ~ 5.5V. Core features include Depop and Short-Circuit Protection; Differential Inputs and Shutdown are not listed. Moisture sensitivity level is rated at 3 (168 Hours), requiring more stringent moisture control during storage and handling. Selection of this part is appropriate for applications prioritizing multi-source availability and where the reduced feature set is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the TPA6017A2PWPR directly replace the LM4874MH/NOPB without PCB modifications?

A: Yes, for applications operating at 4.5V or higher. Both parts use identical 20-PowerTSSOP package geometry and pinout. Applications requiring 3V operation cannot use this substitute, as the TPA6017A2PWPR minimum supply voltage is 4.5V.

Q: What is the impact of reduced output power (2W vs. 2.6W) when using TPA6017A2 substitutes?

A: Output power reduction of 0.6W per channel represents approximately 23% decrease. This affects maximum acoustic output capability. Applications with fixed load impedance and fixed supply voltage will experience proportional reduction in available power. Verify that the reduced power specification meets application requirements before selection.

Q: Why does the BD7836EFV-E2 use a different package designation (20-VSSOP vs. 20-PowerTSSOP)?

A: Both packages maintain identical external dimensions (0.173" width, 4.40mm) and pin pitch, ensuring PCB footprint compatibility. The VSSOP variant includes an exposed pad for enhanced thermal dissipation. The package designation difference reflects internal construction; electrical and mechanical compatibility is maintained.

Q: Are there supply voltage compatibility issues when substituting the LM4874MH/NOPB?

A: Yes. The original part operates from 3V ~ 5.5V. All three substitute parts require minimum 4.5V supply voltage. Applications using 3V or 3.3V supplies cannot use these substitutes without supply voltage modification.

Q: What are the moisture sensitivity implications for long-term storage?

A: The LM4874MH/NOPB carries MSL 1 (Unlimited), allowing indefinite storage without moisture control. TPA6017A2 variants carry MSL 2 (1 Year), requiring dry storage conditions for up to one year. BD7836EFV-E2 carries MSL 3 (168 Hours), requiring moisture control for shorter periods. Verify storage conditions and shelf life requirements for your application timeline.

Q: Do all substitute parts include thermal protection like the original LM4874MH/NOPB?

A: Thermal protection is not explicitly listed in the provided specifications for any substitute part. The original LM4874MH/NOPB includes Thermal Protection as a documented feature. Verify thermal management requirements independently for your application.

Q: Which substitute part is recommended for new designs?

A: TPA6017A2PWPR is recommended for new designs due to active product status from the original manufacturer, identical feature set (Depop, Differential Inputs, Shutdown), and standard MSL 2 rating. This part provides the most direct functional replacement with established supply chain availability.

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