LM4667MM Class D Mono Amplifier IC Equivalent & Substitute Parts

Part Overview

The LM4667MM is a Class D mono amplifier IC manufactured by Texas Instruments, designed for low-power audio applications requiring high efficiency and minimal component count. This device delivers 1.3W output power at 8Ω load with a supply voltage range of 2.7V to 5.5V, making it suitable for portable and battery-powered audio systems.

The LM4667MM is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term production requirements for legacy systems or new designs requiring compatible specifications.

Key Parameters

Parameter	Value
Amplifier Type	Class D
Output Configuration	1-Channel (Mono)
Max Output Power @ 8Ω	1.3W
Supply Voltage Range	2.7V ~ 5.5V
Package Type	10-VSSOP (10-TFSOP, 10-MSOP)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Key Features	Depop, Differential Inputs, Short-Circuit Protection, Shutdown

Substitute Part Grouping Explanation

Substitution eligibility for the LM4667MM is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

Amplifier topology: Class D architecture
Output configuration: Single-channel (mono) operation
Output power specification: 1.3W at 8Ω load
Supply voltage range: 2.7V to 5.5V
Package form factor: 10-VSSOP (10-TFSOP, 10-MSOP)
Operating temperature range: -40°C to 85°C
Feature set: Depop, differential inputs, short-circuit protection, shutdown functionality

The LM4667MM/NOPB qualifies as a direct substitute because it maintains identical electrical specifications, package dimensions, and functional feature set. The primary distinction is product status: the LM4667MM/NOPB is classified as active, whereas the base LM4667MM is obsolete.

Parameter Comparison

Parameter	LM4667MM	LM4667MM/NOPB
Manufacturer	Texas Instruments	National Semiconductor
Product Status	Obsolete	Active
Amplifier Type	Class D	Class D
Output Configuration	1-Channel (Mono)	1-Channel (Mono)
Max Output Power @ 8Ω	1.3W	1.3W
Supply Voltage Range	2.7V ~ 5.5V	2.7V ~ 5.5V
Package Type	10-VSSOP	10-VSSOP
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Features	Depop, Differential Inputs, Short-Circuit Protection, Shutdown	Depop, Differential Inputs, Short-Circuit Protection, Shutdown
ECCN Classification	EAR99	EAR99
HTSUS Code	8542.33.0001	8542.33.0001

Engineering Selection Recommendations

For Obsolete Product Replacement: The LM4667MM/NOPB is the appropriate substitute for the obsolete LM4667MM. Both parts share identical electrical and mechanical specifications, ensuring direct pin-for-pin and functional compatibility. The LM4667MM/NOPB maintains active product status with confirmed inventory availability, eliminating supply chain risk associated with obsolete components.

Compliance Considerations: Both the LM4667MM and LM4667MM/NOPB carry identical export control classifications (ECCN: EAR99) and harmonized tariff codes (HTSUS: 8542.33.0001). The LM4667MM is RoHS non-compliant, while compliance status for the LM4667MM/NOPB is not specified in the provided data. Design teams must verify RoHS compliance requirements against applicable regulatory standards before final component selection.

Moisture Sensitivity: The LM4667MM carries MSL Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can the LM4667MM/NOPB be used as a direct replacement for the LM4667MM in existing designs?

A: Yes. The LM4667MM/NOPB is electrically and mechanically equivalent to the LM4667MM. Both devices feature identical output power (1.3W @ 8Ω), supply voltage range (2.7V–5.5V), package form factor (10-VSSOP), and feature set (depop, differential inputs, short-circuit protection, shutdown). No circuit modifications are required for substitution.

Q: What is the primary reason to transition from LM4667MM to LM4667MM/NOPB?

A: The LM4667MM is classified as obsolete, creating long-term supply chain risk. The LM4667MM/NOPB maintains active product status with higher inventory availability, ensuring reliable component sourcing for ongoing production and future designs.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the 10-VSSOP package (10-TFSOP, 10-MSOP with 0.118" width and 3.00mm height). Pinout and package dimensions are identical, enabling direct PCB compatibility without layout modifications.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by matching Class D topology, 1-channel (mono) output configuration, 1.3W output power at 8Ω load, 2.7V–5.5V supply voltage range, and -40°C to 85°C operating temperature. All substitute parts must maintain these specifications without deviation.

Q: Is RoHS compliance a factor in selecting between these parts?

A: The LM4667MM is explicitly RoHS non-compliant. RoHS compliance status for the LM4667MM/NOPB is not provided in available documentation. Design teams must verify compliance requirements against applicable regulations (EU Directive 2011/65/EU or equivalent) and confirm substitute part status with the manufacturer or authorized distributor before final selection.

Q: What is the difference between LM4667MM and LM4667MM/NOPB designations?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging. This designation reflects manufacturing process differences but does not affect electrical performance or functional compatibility. Both parts are surface-mount Class D amplifiers with identical specifications.

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