LM4809MM Equivalent & Substitute Parts

Part Overview

The LM4809MM is a Class AB stereo headphone amplifier IC manufactured by Texas Instruments, designed for dual-channel audio applications with 105mW output power per channel at 16Ω load impedance. The device operates across a 2V to 5.5V supply voltage range and integrates protection features including depop, shutdown, and thermal protection functionality.

The LM4809MM carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this component.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	Headphones, 2-Channel (Stereo)
Max Output Power per Channel @ 16Ω	105mW
Supply Voltage Range	2V ~ 5.5V
Integrated Features	Depop, Shutdown, Thermal Protection
Mounting Type	Surface Mount
Package Type	8-VSSOP (8-TSSOP, 8-MSOP)
Operating Temperature Range	-40°C ~ 85°C (TA)
Series	Boomer®

Substitute Part Grouping Explanation

Substitution eligibility for the LM4809MM is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

Amplifier topology: Class AB configuration
Output stage: Dual-channel stereo headphone amplifier
Output power specification: 105mW per channel at 16Ω load
Supply voltage compatibility: 2V ~ 5.5V operating range
Integrated protection features: Depop, shutdown, and thermal protection
Package form factor: 8-VSSOP (8-TSSOP, 8-MSOP) surface mount
Operating temperature range: -40°C ~ 85°C

The LM4809MM/NOPB qualifies as a direct substitute based on complete parameter alignment across all electrical and mechanical specifications. The primary distinction between the main part and substitute relates to product status and packaging designation.

Parameter Comparison

Parameter	LM4809MM	LM4809MM/NOPB
Manufacturer	Texas Instruments	National Semiconductor
Product Status	Obsolete	Active
Amplifier Type	Class AB	Class AB
Output Configuration	Headphones, 2-Channel (Stereo)	Headphones, 2-Channel (Stereo)
Max Output Power @ 16Ω	105mW x 2	105mW x 2
Supply Voltage Range	2V ~ 5.5V	2V ~ 5.5V
Integrated Features	Depop, Shutdown, Thermal Protection	Depop, Shutdown, Thermal Protection
Mounting Type	Surface Mount	Surface Mount
Package Type	8-VSSOP	8-VSSOP
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Series	Boomer®	Boomer®
Packaging Type	Tube	Bulk
ECCN Classification	EAR99	EAR99
HTSUS Code	8542.33.0001	8542.33.0001

Engineering Selection Recommendations

LM4809MM/NOPB as Primary Substitute:

The LM4809MM/NOPB is the direct functional equivalent of the LM4809MM. Selection of this substitute is supported by:

Product Status Alignment: The LM4809MM/NOPB maintains Active product status, ensuring ongoing manufacturer support, documentation availability, and supply chain continuity compared to the Obsolete status of the original part.
Electrical Equivalence: All electrical parameters—amplifier class, output power, supply voltage range, and integrated protection features—are identical between the main part and substitute.
Mechanical Compatibility: Both parts utilize the 8-VSSOP package form factor with identical pin configuration and thermal characteristics, enabling direct PCB layout compatibility without redesign.
Regulatory Compliance: Both parts share identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications, maintaining consistent export and tariff treatment.
Packaging Consideration: The LM4809MM/NOPB is supplied in Bulk packaging, whereas the original LM4809MM uses Tube packaging. Bulk packaging is standard for active production components and does not affect electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can the LM4809MM/NOPB be used as a direct replacement for the LM4809MM in existing designs?

A: Yes. The LM4809MM/NOPB is electrically and mechanically equivalent to the LM4809MM. All electrical specifications, package dimensions, pin assignments, and operating characteristics are identical. No circuit modifications or PCB redesign are required.

Q: What is the significance of the "/NOPB" suffix in the part number?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging designation. This denotes RoHS compliance in the manufacturing process. The electrical and functional performance of the device is not affected by this designation.

Q: Why is the LM4809MM listed as Obsolete?

A: Obsolete status indicates that the manufacturer has discontinued active production and support for this specific part number variant. The LM4809MM/NOPB, as an active equivalent, provides continued access to the same functional performance with ongoing manufacturer support.

Q: Are there any differences in thermal performance between the LM4809MM and LM4809MM/NOPB?

A: No. Both parts utilize the identical 8-VSSOP package with the same thermal characteristics. Operating temperature range (-40°C ~ 85°C) and thermal protection features are equivalent.

Q: What is the impact of Bulk versus Tube packaging on component selection?

A: Packaging format (Bulk versus Tube) affects logistics, handling, and storage procedures but does not impact electrical performance, reliability, or functionality. Component selection should be based on electrical and mechanical parameters; packaging format is a supply chain consideration.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both the LM4809MM and LM4809MM/NOPB share identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications, ensuring consistent regulatory treatment for export, import, and tariff purposes.

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