LM4889MM Equivalent & Substitute Parts

Part Overview

The LM4889MM is a Class AB mono amplifier IC manufactured by Texas Instruments, part of the Boomer® series. It delivers 1W output power at 8Ω load in a compact 8-VSSOP surface mount package. The device operates across a 2.2V to 5.5V supply range and includes integrated depop, shutdown, and thermal protection features.

The LM4889MM is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this amplifier topology.

Substiute Parts

LM4889MM

Texas InstrumentsIn Stock: 4839LM4889MM Datasheet

Current PartRFQ

LM4889MM/NOPB

Texas InstrumentsIn Stock: 16999LM4889MM/NOPB Datasheet

DirectRFQ

TS4990IST

STMicroelectronicsIn Stock: 36641TS4990IST Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM4889MM is determined by the following criteria:

Primary Compatibility Parameters:

• Amplifier topology: Class AB
• Output configuration: 1-Channel (Mono)
• Supply voltage range: 2.2V ~ 5.5V (minimum requirement)
• Operating temperature range: -40°C ~ 85°C (minimum requirement)
• Mounting type: Surface Mount
• Package compatibility: 8-pin configurations (8-VSSOP, 8-TSSOP, 8-MSOP, 8-MiniSO)

Secondary Consideration:

• Output power at 8Ω load: Equal to or greater than 1W

Substitute parts must satisfy all primary parameters. Output power equal to or exceeding 1W at 8Ω ensures functional equivalence or improvement in the target application. Parts meeting these criteria are classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

LM4889MM/NOPB (Direct Substitute - Recommended)

The LM4889MM/NOPB is the primary substitute for the obsolete LM4889MM. Both parts share identical electrical specifications, including 1W output power at 8Ω, 2.2V to 5.5V supply range, and -40°C to 85°C operating temperature. The LM4889MM/NOPB maintains the same 8-VSSOP package and integrated feature set (depop, shutdown, thermal protection).

The critical distinction is product status: LM4889MM/NOPB is active with significantly higher inventory availability (16927 units versus 4762 units). Additionally, LM4889MM/NOPB carries ROHS3 compliance, whereas the original LM4889MM is non-compliant. This substitute is suitable for direct replacement without circuit modification.

TS4990IST (Functional Substitute - Alternative)

The TS4990IST from STMicroelectronics meets all primary substitution criteria. It operates at identical supply voltage (2.2V ~ 5.5V) and temperature range (-40°C ~ 85°C) with the same Class AB mono topology. Output power is 1.2W at 8Ω, exceeding the 1W requirement.

The TS4990IST uses an 8-MiniSO package rather than 8-VSSOP. While both are 8-pin surface mount packages with compatible pinout functionality, PCB layout modification is required. The device includes differential inputs and standby mode in addition to depop and thermal protection. TS4990IST carries ROHS3 compliance and has the highest inventory availability (36573 units).

Selection between LM4889MM/NOPB and TS4990IST depends on PCB layout constraints. LM4889MM/NOPB requires no layout changes; TS4990IST requires package footprint modification but offers higher output power and greater supply availability.

Frequently Asked Questions (FAQ)

Q: Can LM4889MM/NOPB replace LM4889MM without circuit modification?

A: Yes. LM4889MM/NOPB is electrically and functionally identical to LM4889MM. Both share the same 8-VSSOP package, 1W output power at 8Ω, 2.2V to 5.5V supply range, and integrated protection features. No circuit or PCB layout changes are required.

Q: What is the difference between LM4889MM and LM4889MM/NOPB?

A: The primary differences are product status and compliance. LM4889MM is obsolete and RoHS non-compliant; LM4889MM/NOPB is active and ROHS3 compliant. Electrical specifications and package are identical. The "/NOPB" suffix indicates lead-free, halogen-free packaging.

Q: Can TS4990IST replace LM4889MM in existing designs?

A: TS4990IST is functionally compatible but requires PCB layout modification. The device uses an 8-MiniSO package instead of 8-VSSOP, necessitating footprint redesign. Electrical parameters are compatible: identical supply voltage range, operating temperature, and Class AB topology. Output power is 1.2W at 8Ω, exceeding the 1W specification. Pinout functionality is equivalent.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution is determined by: Class AB amplifier topology, 1-channel mono output, 2.2V to 5.5V supply voltage range, -40°C to 85°C operating temperature, surface mount mounting type, and 8-pin package configuration. Output power must equal or exceed 1W at 8Ω load.

Q: Is the TS4990IST package compatible with LM4889MM PCB layouts?

A: No. TS4990IST uses 8-MiniSO packaging; LM4889MM uses 8-VSSOP. While both are 8-pin surface mount packages, the physical footprints differ. PCB layout modification is required for TS4990IST implementation.

Q: Which substitute has better supply availability?

A: TS4990IST has the highest inventory availability at 36573 units. LM4889MM/NOPB has 16927 units in stock. The original LM4889MM has 4762 units remaining.

Q: Are both substitutes RoHS compliant?

A: Yes. Both LM4889MM/NOPB and TS4990IST are ROHS3 compliant. The original LM4889MM is RoHS non-compliant.