TS4900ID Equivalent & Substitute Parts

Part Overview

The TS4900ID is a Class AB mono audio amplifier IC manufactured by STMicroelectronics, housed in an 8-SOIC surface mount package. This component delivers 700mW output power at 8 ohms and operates across a 2.5V to 5.5V supply voltage range. The TS4900ID is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute components must maintain functional compatibility in Class AB mono amplification applications while meeting the same mechanical and electrical interface requirements.

Key Parameters

Parameter	TS4900ID Value	Criticality for Substitution
Category	Linear, Amplifiers	Primary
Type	Class AB	Primary
Output Type	1-Channel (Mono)	Primary
Max Output Power @ Load	700mW @ 8Ohm	Primary
Voltage Supply Range	2.5V ~ 5.5V	Primary
Package / Case	8-SOIC (0.154", 3.90mm Width)	Primary
Mounting Type	Surface Mount	Primary
Operating Temperature	-40°C ~ 85°C (TA)	Secondary
Features	Depop, Standby, Thermal Protection	Secondary

Substitute Part Grouping Explanation

Substitution logic for the TS4900ID is based on the following criteria:

Primary Compatibility Requirements:

Class AB amplifier topology
1-Channel (Mono) output configuration
8-SOIC surface mount package with identical 0.154" (3.90mm) width
Output power rating at 8 ohm load equal to or exceeding 700mW
Supply voltage range encompassing or overlapping 2.5V ~ 5.5V

Secondary Compatibility Factors:

Operating temperature range of -40°C to 85°C
Presence of thermal protection and depop features
RoHS compliance status and moisture sensitivity level

Substitute parts are grouped into two categories based on output power capability: parts meeting or exceeding the 700mW specification at 8 ohms, and parts with lower output power that require application-level verification of suitability.

Parameter Comparison

Part Number	Manufacturer	Type	Output Power @ 8Ohm	Supply Voltage	Package	Product Status	RoHS Status
TS4900ID	STMicroelectronics	Class AB Mono	700mW	2.5V ~ 5.5V	8-SOIC	Obsolete	Non-compliant
LM4864M/NOPB	Texas Instruments	Class AB Mono	675mW	2.7V ~ 5.5V	8-SOIC	Active	ROHS3 Compliant
LM4864MX/NOPB	Texas Instruments	Class AB Mono	675mW	2.7V ~ 5.5V	8-SOIC	Active	ROHS3 Compliant
LM4862MX/NOPB	National Semiconductor	Class AB Mono	825mW	2.7V ~ 5.5V	8-SOIC	Active	Not specified
LM4862M/NOPB	National Semiconductor	Class AB Mono	825mW	2.7V ~ 5.5V	8-SOIC	Active	Not specified
LM4862M	National Semiconductor	Class AB Mono	825mW	2.7V ~ 5.5V	8-SOIC	Active	Not specified
LM4861MX/NOPB	Texas Instruments	Class AB Mono	1.5W	2V ~ 5.5V	8-SOIC	Active	ROHS3 Compliant
LM4861MX	National Semiconductor	Class AB Mono	1.5W	2V ~ 5.5V	8-SOIC	Active	Not specified
LM4861M/NOPB	Texas Instruments	Class AB Mono	1.5W	2V ~ 5.5V	8-SOIC	Active	ROHS3 Compliant
LM4861M	Texas Instruments	Class AB Mono	1.5W	2V ~ 5.5V	8-SOIC	Active	ROHS3 Compliant
LM4819MX/NOPB	Texas Instruments	Class AB Mono	350mW	2V ~ 5.5V	8-SOIC	Active	ROHS3 Compliant
LM4818MX/NOPB	Texas Instruments	Class AB Mono	350mW @ 16Ohm	2V ~ 5.5V	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Equivalent or Higher Output Power):

The LM4864M/NOPB and LM4864MX/NOPB from Texas Instruments are the closest functional equivalents. Both deliver 675mW at 8 ohms, operate within a 2.7V to 5.5V supply range, and are housed in identical 8-SOIC packages. These parts are active products with ROHS3 compliance, providing long-term availability and regulatory alignment. The minimum supply voltage of 2.7V represents a 0.2V offset from the TS4900ID specification; applications operating below 2.7V require verification.

The LM4862 series (LM4862M, LM4862M/NOPB, LM4862MX/NOPB) from National Semiconductor provides higher output power at 825mW, exceeding the TS4900ID specification. These parts operate from 2.7V to 5.5V and include thermal protection and shutdown features. Higher output power allows for design margin in power-limited applications.

The LM4861 series (LM4861M, LM4861M/NOPB, LM4861MX/NOPB) delivers 1.5W output power with an extended lower supply voltage limit of 2V. These parts are suitable for applications requiring higher power delivery or lower minimum supply voltage operation.

Lower Power Alternatives:

The LM4818MX/NOPB and LM4819MX/NOPB deliver 350mW output power, representing a 50% reduction from the TS4900ID specification. These parts are suitable only for applications where the lower power output is acceptable or where the TS4900ID was over-specified for the original design.

Compliance and Availability:

All recommended substitutes are active products with established supply chains. Texas Instruments parts carry ROHS3 compliance certification. National Semiconductor parts do not specify RoHS status in the provided data. Applications requiring RoHS compliance should prioritize Texas Instruments alternatives.

Frequently Asked Questions (FAQ)

Q: Can the LM4864M/NOPB directly replace the TS4900ID without circuit modifications?

A: The LM4864M/NOPB is mechanically and functionally compatible, sharing the 8-SOIC package and Class AB mono topology. The 675mW output power is within 96% of the TS4900ID specification. The supply voltage range shift from 2.5V minimum to 2.7V minimum requires verification that the application does not operate below 2.7V. Pin-level compatibility must be confirmed against device datasheets.

Q: What is the difference between LM4861M and LM4861MX variants?

A: Both variants deliver identical electrical performance at 1.5W output power with 2V to 5.5V supply operation. The primary difference is packaging format: LM4861M is supplied in Tube packaging, while LM4861MX/NOPB is supplied in Cut Tape (CT) and Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why do LM4818MX/NOPB and LM4819MX/NOPB have lower output power ratings?

A: The LM4818 and LM4819 are designed for lower-power audio applications. The LM4819MX/NOPB includes differential inputs, providing additional functionality for specific signal conditioning requirements. These parts are suitable only for applications where 350mW output power meets the design specification.

Q: Are there supply voltage compatibility issues with substitute parts?

A: The TS4900ID operates from 2.5V to 5.5V. The LM4864 series minimum is 2.7V, and the LM4862 series minimum is also 2.7V. The LM4861 and LM4818/LM4819 series extend to 2V minimum. Applications operating between 2.5V and 2.7V require parts from the LM4861 or LM4818/LM4819 families. The upper 5.5V limit is consistent across all substitutes.

Q: What thermal protection features are included in substitute parts?

A: The TS4900ID includes thermal protection. The LM4864, LM4862, and LM4861 series all include thermal protection. The LM4818 and LM4819 include shutdown functionality but thermal protection status is not specified in the provided data. Thermal management design should not rely on protection features as a primary design criterion.

Q: Is the 8-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use the 8-SOIC package with 0.154" (3.90mm) width, providing mechanical compatibility with existing PCB layouts designed for the TS4900ID.

Q: Which substitute offers the best long-term availability?

A: The LM4861M/NOPB and LM4861MX/NOPB from Texas Instruments show the highest inventory levels (29,714 and 29,814 units respectively) and active product status with ROHS3 compliance, indicating strong long-term support and supply continuity.

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