LM4871MM Equivalent & Substitute Parts

Part Overview

The LM4871MM is a Class AB mono amplifier IC manufactured by Texas Instruments, part of the Boomer® series. This device delivers 3W output power at 3Ohm load with a supply voltage range of 2V to 5.5V, integrated shutdown and thermal protection features, and operates across -40°C to 85°C. The LM4871MM is classified as obsolete, necessitating identification of equivalent and substitute components for new designs and production continuity.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	1-Channel (Mono)
Max Output Power	3W @ 3Ohm
Supply Voltage Range	2V ~ 5.5V
Integrated Features	Shutdown, Thermal Protection
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package Type	8-VSSOP / 8-TSSOP / 8-MSOP

Substitute Part Grouping Explanation

Substitution eligibility for the LM4871MM is determined by the following critical parameters:

Amplifier Classification: Class AB topology
Channel Configuration: Single-channel (mono) output
Supply Voltage Compatibility: Operating range must encompass or overlap with 2V ~ 5.5V
Thermal Management: Integrated thermal protection required
Package Compatibility: Surface mount 8-pin packages (VSSOP, TSSOP, MSOP variants)
Operating Temperature Range: -40°C ~ 85°C minimum

Two substitute parts meet these criteria with varying degrees of parameter alignment:

LM4871MM/NOPB (Texas Instruments): Direct equivalent with identical electrical specifications and enhanced compliance status.

TS4871IST (STMicroelectronics): Functional substitute with Class AB mono configuration; output power specification differs (1W @ 8Ohm versus 3W @ 3Ohm).

Parameter Comparison

Parameter	LM4871MM	LM4871MM/NOPB	TS4871IST
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics
Category	Linear, Amplifiers	Linear, Amplifiers	Linear, Amplifiers
Amplifier Type	Class AB	Class AB	Class AB
Output Configuration	1-Channel (Mono)	1-Channel (Mono)	1-Channel (Mono)
Max Output Power	3W @ 3Ohm	3W @ 3Ohm	1W @ 8Ohm
Supply Voltage Range	2V ~ 5.5V	2V ~ 5.5V	2.5V ~ 5.5V
Integrated Features	Shutdown, Thermal Protection	Shutdown, Thermal Protection	Depop, Standby, Thermal Protection
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Supplier Device Package	8-VSSOP	8-VSSOP	8-MiniSO
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

LM4871MM/NOPB is the primary substitute for the obsolete LM4871MM. This part maintains identical electrical specifications, supply voltage range, output power rating, and thermal operating window. The LM4871MM/NOPB carries Active product status with ROHS3 compliance, addressing regulatory requirements absent in the original LM4871MM. Packaging remains compatible (8-VSSOP). This substitution requires no circuit redesign or application modification.

TS4871IST serves as a secondary substitute for applications where output power requirements are reduced. This STMicroelectronics device operates within the same Class AB mono topology and temperature range but specifies 1W output power at 8Ohm load versus the LM4871MM's 3W at 3Ohm. The minimum supply voltage is 2.5V (versus 2V for the LM4871MM). TS4871IST includes additional integrated features (Depop, Standby) and carries ROHS3 compliance. Package type differs (8-MiniSO), requiring PCB layout evaluation. This substitution is suitable only for designs where lower output power is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LM4871MM/NOPB directly replace LM4871MM without circuit modification?

A: Yes. LM4871MM/NOPB is a direct equivalent with identical electrical specifications, supply voltage range (2V ~ 5.5V), output power (3W @ 3Ohm), operating temperature (-40°C ~ 85°C), and package type (8-VSSOP). No circuit redesign is required.

Q: What is the primary difference between LM4871MM and TS4871IST?

A: Output power specification differs. LM4871MM delivers 3W at 3Ohm load; TS4871IST delivers 1W at 8Ohm load. Both are Class AB mono amplifiers with identical operating temperature range and surface mount configuration. TS4871IST is suitable only for applications with reduced power requirements.

Q: Are there package compatibility concerns with TS4871IST?

A: Yes. TS4871IST uses 8-MiniSO package, while LM4871MM uses 8-VSSOP. Although both are 8-pin surface mount packages with 0.118" width, pinout and footprint differ. PCB layout and schematic verification are required before substitution.

Q: What is the compliance status difference between LM4871MM and its substitutes?

A: LM4871MM is RoHS non-compliant. Both LM4871MM/NOPB and TS4871IST are ROHS3 compliant. For applications subject to RoHS regulations, LM4871MM/NOPB or TS4871IST must be used.

Q: Can TS4871IST be used in all LM4871MM applications?

A: No. TS4871IST is suitable only for applications where 1W output power at 8Ohm load is sufficient. Applications requiring 3W output power at 3Ohm load must use LM4871MM/NOPB. Additionally, minimum supply voltage for TS4871IST is 2.5V; applications operating below 2.5V require LM4871MM/NOPB.

Q: What inventory status should be considered for production planning?

A: LM4871MM (26,800 pcs), LM4871MM/NOPB (27,651 pcs), and TS4871IST (23,016 pcs) are all available in stock. LM4871MM/NOPB is recommended for new designs due to Active product status and compliance certifications.

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