TS421ID Equivalent & Substitute Parts

Part Overview

The TS421ID is a Class AB mono audio power amplifier IC manufactured by STMicroelectronics, housed in an 8-SOIC surface mount package. This device delivers 367mW output power at 16Ohm load impedance and operates across a 2V to 5.5V supply voltage range. The TS421ID is classified as obsolete, making identification of functionally equivalent active alternatives essential for ongoing design support and production continuity.

Substiute Parts

TS421ID

STMicroelectronicsIn Stock: 866TS421ID Datasheet

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LM4889MA/NOPB

National SemiconductorIn Stock: 1301LM4889MA/NOPB Datasheet

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LM4889MAX/NOPB

Texas InstrumentsIn Stock: 32130LM4889MAX/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TS421ID is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Package type: 8-SOIC form factor with identical 0.154" (3.90mm) width
• Amplifier topology: Class AB mono configuration
• Supply voltage range: Minimum 2V operation with maximum 5.5V tolerance
• Operating temperature range: -40°C to 85°C
• Mounting technology: Surface mount compatibility
• Output power capability: Minimum 367mW at specified load impedance

The substitute parts LM4889MA/NOPB and LM4889MAX/NOPB satisfy these criteria through identical package geometry, matching amplifier class and channel configuration, compatible supply voltage specifications, and equivalent thermal operating range. Both substitutes deliver 1W output power at 8Ohm load, exceeding the TS421ID performance envelope while maintaining electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

LM4889MAX/NOPB (Recommended Primary Substitute)

The LM4889MAX/NOPB is the preferred substitute for TS421ID applications. This device is manufactured by Texas Instruments and maintains active product status, ensuring long-term availability and supply chain stability. The LM4889MAX/NOPB carries ROHS3 compliance certification matching the original part and features Moisture Sensitivity Level 1 (unlimited), providing superior handling characteristics compared to the TS421ID MSL 3 rating. Inventory availability of 32,044 units supports immediate procurement. The part is supplied in Cut Tape and Digi-Reel packaging formats, facilitating both prototype and production-volume applications.

LM4889MA/NOPB (Secondary Substitute)

The LM4889MA/NOPB, manufactured by National Semiconductor, provides an alternative substitute with active product status. This variant is supplied in bulk packaging and maintains identical electrical specifications and package geometry. Inventory of 1,245 units is available. RoHS compliance status is not specified for this variant, requiring verification if ROHS3 certification is a design requirement.

Both substitutes exceed the TS421ID output power specification (1W versus 367mW) while maintaining identical package form factor, amplifier topology, and operating temperature range. The minimum supply voltage specification increases from 2V to 2.2V; designs operating below 2.2V require retention of TS421ID inventory or circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can LM4889MAX/NOPB and LM4889MA/NOPB be used interchangeably with TS421ID?

A: Both LM4889 variants are electrically and mechanically compatible with TS421ID in applications where the minimum supply voltage of 2.2V is acceptable. The identical 8-SOIC package geometry permits direct PCB footprint compatibility. Output power capability of 1W at 8Ohm exceeds TS421ID performance at 367mW at 16Ohm.

Q: What is the primary difference between LM4889MAX/NOPB and LM4889MA/NOPB?

A: Both parts share identical electrical specifications and package type. Differences include manufacturer (Texas Instruments versus National Semiconductor), product status (both active), packaging format (Cut Tape/Digi-Reel versus bulk), and moisture sensitivity rating (MSL 1 versus unspecified). LM4889MAX/NOPB offers superior supply chain documentation through Texas Instruments.

Q: Does the increased output power of LM4889 variants affect circuit design?

A: The LM4889 series delivers higher output power (1W at 8Ohm) compared to TS421ID (367mW at 16Ohm). Existing circuit designs require thermal and power dissipation analysis to confirm component and PCB thermal management adequacy. Load impedance specifications must be verified against application requirements.

Q: Are there supply voltage compatibility concerns?

A: TS421ID operates from 2V minimum supply voltage, while both LM4889 variants require 2.2V minimum. Applications operating below 2.2V cannot use LM4889 substitutes without circuit modification or TS421ID inventory retention.

Q: What compliance certifications apply to these substitutes?

A: LM4889MAX/NOPB carries ROHS3 compliance matching TS421ID. LM4889MA/NOPB RoHS status is not specified. Both parts carry EAR99 export classification and HTSUS code 8542.33.0001. REACH status is unaffected for all three parts.

Q: How does package moisture sensitivity affect handling?

A: TS421ID carries MSL 3 (168 hours), requiring controlled storage and handling procedures. LM4889MAX/NOPB carries MSL 1 (unlimited), eliminating moisture sensitivity constraints. LM4889MA/NOPB MSL rating is not specified. MSL 1 rated components provide superior shelf-life and handling flexibility.