TS4871IDT Equivalent & Substitute Parts

Part Overview

The TS4871IDT is a Class AB mono audio amplifier IC manufactured by STMicroelectronics, housed in an 8-SOIC surface mount package. This device delivers 1W output power at 8Ohm load with integrated depop, standby, and thermal protection features. The TS4871IDT is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts are selected based on matching electrical specifications, package compatibility, and functional feature sets.

Key Parameters

Parameter	TS4871IDT Specification
Amplifier Type	Class AB
Output Configuration	1-Channel (Mono)
Max Output Power @ 8Ohm	1W
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are organized into two categories based on electrical and mechanical compatibility with the TS4871IDT:

Direct Substitutes maintain identical or superior electrical performance within the same package footprint and supply voltage range. These parts are pin-compatible and functionally interchangeable for the TS4871IDT application.

Similar Substitutes provide equivalent mono Class AB amplification in the same 8-SOIC package with compatible supply voltage and operating temperature ranges, but with variations in output power ratings or feature sets.

Substitution eligibility is determined by the following parameters:

Amplifier Type: Class AB
Output Configuration: 1-Channel (Mono)
Package: 8-SOIC (0.154", 3.90mm Width)
Supply Voltage Range: Minimum 2.5V support
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount

Parameter Comparison

Part Number	Manufacturer	Type	Output Power @ Load	Supply Voltage	Package	Product Status	Features
TS4871IDT	STMicroelectronics	Class AB	1W @ 8Ohm	2.5V ~ 5.5V	8-SOIC	Obsolete	Depop, Standby, Thermal Protection
TS4990IDT	STMicroelectronics	Class AB	1.2W @ 8Ohm	2.2V ~ 5.5V	8-SOIC	Active	Depop, Differential Inputs, Standby, Thermal Protection
LM4861M	Texas Instruments	Class AB	1.5W @ 8Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection
LM4861M/NOPB	Texas Instruments	Class AB	1.5W @ 8Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection
LM4861MX	National Semiconductor	Class AB	1.5W @ 8Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection
LM4861MX/NOPB	Texas Instruments	Class AB	1.5W @ 8Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection
LM4871M	National Semiconductor	Class AB	3W @ 3Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection
LM4871M/NOPB	Texas Instruments	Class AB	3W @ 3Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection
LM4871MX	National Semiconductor	Class AB	3W @ 3Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection
LM4871MX/NOPB	National Semiconductor	Class AB	3W @ 3Ohm	2V ~ 5.5V	8-SOIC	Active	Shutdown, Thermal Protection

Engineering Selection Recommendations

Primary Substitute: TS4990IDT

The TS4990IDT from STMicroelectronics is the recommended direct substitute for the obsolete TS4871IDT. Both devices share the same manufacturer, package footprint, and operating temperature range. The TS4990IDT provides enhanced output power (1.2W versus 1W at 8Ohm), extended supply voltage support (2.2V minimum), and additional differential input capability. The TS4990IDT maintains ROHS3 compliance and unlimited moisture sensitivity rating. This part is currently in active production status with substantial inventory availability.

Secondary Substitutes: LM4861 Series

The LM4861M, LM4861M/NOPB, LM4861MX, and LM4861MX/NOPB devices from Texas Instruments and National Semiconductor provide functional equivalence with increased output power (1.5W at 8Ohm). These parts maintain identical 8-SOIC packaging, -40°C to 85°C operating temperature range, and ROHS3 compliance. The LM4861 series operates across 2V to 5.5V supply range, supporting the TS4871IDT minimum voltage requirement. All variants are in active production with high inventory levels.

Higher Power Alternatives: LM4871 Series

The LM4871M, LM4871M/NOPB, LM4871MX, and LM4871MX/NOPB devices deliver 3W output power at 3Ohm load within the same 8-SOIC package. These parts are suitable for applications requiring increased power delivery while maintaining compatibility with the TS4871IDT supply voltage and temperature specifications. All LM4871 variants are active production components with robust inventory availability.

All substitute parts maintain surface mount compatibility and thermal protection features. Selection between substitutes depends on specific application power requirements and load impedance specifications.

Frequently Asked Questions (FAQ)

Q: Can the TS4990IDT directly replace the TS4871IDT without PCB modifications?

A: Yes. The TS4990IDT shares identical 8-SOIC package dimensions (0.154", 3.90mm width) and pin configuration with the TS4871IDT. No PCB layout changes are required for mechanical or electrical compatibility.

Q: What is the primary difference between TS4990IDT and LM4861 series substitutes?

A: The TS4990IDT is manufactured by STMicroelectronics and includes differential input capability. The LM4861 series from Texas Instruments and National Semiconductor provides higher output power (1.5W at 8Ohm) with single-ended input configuration. Both maintain identical package and operating temperature specifications.

Q: Are the LM4871 series parts suitable replacements for the TS4871IDT?

A: The LM4871 series provides functional substitution with significantly higher output power (3W at 3Ohm). These parts maintain the same 8-SOIC package and operating temperature range. Selection depends on whether the application requires the additional power capability. The LM4871 series is not pin-for-pin compatible if the TS4871IDT is specified for 8Ohm load operation.

Q: Do all substitute parts maintain RoHS3 compliance?

A: The TS4990IDT, LM4861M/NOPB, LM4861MX/NOPB, LM4871M/NOPB, and LM4871MX/NOPB variants are explicitly ROHS3 compliant. Compliance status for LM4861M, LM4861MX, LM4871M, and LM4871MX should be verified with the respective manufacturer or distributor.

Q: What is the moisture sensitivity level for substitute parts?

A: The TS4990IDT maintains MSL 1 (Unlimited) rating. The LM4861 and LM4871 series variants with /NOPB designation are rated MSL 1 (Unlimited). MSL ratings for non-/NOPB variants should be confirmed with the manufacturer.

Q: Can substitute parts operate at the TS4871IDT minimum supply voltage of 2.5V?

A: The TS4990IDT supports 2.2V minimum, meeting the 2.5V requirement. The LM4861 and LM4871 series support 2V minimum supply voltage, providing margin below the TS4871IDT specification. All substitutes are compatible with the 2.5V to 5.5V operating range.

Q: What packaging options are available for substitute parts?

A: The TS4990IDT is available in Cut Tape (CT) and Digi-Reel packaging. The LM4861M/NOPB and LM4861MX/NOPB are supplied in Tube and Cut Tape formats respectively. The LM4871M/NOPB is available in Tube packaging. Packaging selection depends on production volume and assembly requirements.

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