TS489IST Equivalent & Substitute Parts

Part Overview

The TS489IST is a Class AB stereo headphone amplifier IC manufactured by STMicroelectronics in an 8-MiniSO package. This device delivers 130mW per channel at 16Ohm load and operates across a 2.2V to 5.5V supply range. The TS489IST is classified as obsolete, necessitating identification of functionally equivalent active alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the stereo headphone amplification application while meeting the electrical and mechanical constraints of the original specification.

Substiute Parts

TS489IST

STMicroelectronicsIn Stock: 4461TS489IST Datasheet

Current PartRFQ

LM4810MM/NOPB

Texas InstrumentsIn Stock: 1580LM4810MM/NOPB Datasheet

SimilarRFQ

LM4810MMX/NOPB

Texas InstrumentsIn Stock: 19407LM4810MMX/NOPB Datasheet

SimilarRFQ

TPA122DGN

Texas InstrumentsIn Stock: 1922TPA122DGN Datasheet

SimilarRFQ

TPA122DGNR

Texas InstrumentsIn Stock: 17160TPA122DGNR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TS489IST is determined by the following critical parameters: amplifier topology (Class AB), output configuration (stereo headphone), supply voltage compatibility, operating temperature range, surface mount capability, and regulatory compliance (RoHS3, REACH Unaffected). All substitute parts must support 2-Channel stereo headphone amplification with surface mount packaging and identical temperature operating range.

The substitute parts are grouped into two categories based on output power capability:

Group 1 (Higher Power Output): LM4810MM/NOPB and LM4810MMX/NOPB deliver 105mW per channel at 16Ohm, representing a 19% reduction from the TS489IST specification. Both maintain the 2V to 5.5V supply range (encompassing the TS489IST range), identical operating temperature, and equivalent protection features (Depop, Thermal Protection, Shutdown). These parts are manufactured by Texas Instruments under the Boomer® series and carry Active product status.

Group 2 (Lower Power Output): TPA122DGN and TPA122DGNR deliver 70mW per channel at 8Ohm load, representing a 46% reduction from the TS489IST specification. These parts operate across 2.5V to 5.5V supply range and include enhanced protection (Depop, Short-Circuit and Thermal Protection, Shutdown). Both are manufactured by Texas Instruments and carry Active product status.

Parameter Comparison

Engineering Selection Recommendations

LM4810MM/NOPB and LM4810MMX/NOPB Selection: These Texas Instruments Boomer® series amplifiers are recommended as primary substitutes for applications where output power reduction from 130mW to 105mW per channel is acceptable. Both parts maintain Active product status, ensuring long-term availability and supply chain stability. The LM4810MMX/NOPB variant in Tape & Reel packaging offers higher inventory availability (19,300 units) compared to the cut tape variant. Both parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the TS489IST.

TPA122DGN and TPA122DGNR Selection: These Texas Instruments amplifiers are suitable for applications with lower power requirements (70mW per channel at 8Ohm). The TPA122DGNR variant in Tape & Reel packaging provides higher inventory availability (17,124 units). Both parts carry Active product status and full regulatory compliance. The minimum supply voltage specification of 2.5V (versus 2.2V for TS489IST) must be verified against circuit design requirements.

All substitute parts maintain identical operating temperature range (-40°C to 85°C), surface mount capability, and MSL 1 moisture sensitivity classification. Package footprints are mechanically compatible with the original TS489IST specification.

Frequently Asked Questions (FAQ)

Q: Can the LM4810 series directly replace the TS489IST without circuit modification?

A: The LM4810MM/NOPB and LM4810MMX/NOPB are pin-compatible and functionally equivalent for stereo headphone amplification. However, the output power specification is reduced from 130mW to 105mW per channel at 16Ohm load. Circuit design must accommodate this power reduction. The supply voltage range of 2V to 5.5V encompasses the TS489IST specification of 2.2V to 5.5V.

Q: What is the difference between LM4810MM/NOPB and LM4810MMX/NOPB?

A: Both parts are electrically identical with identical electrical specifications. The primary difference is packaging format: LM4810MM/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format, while LM4810MMX/NOPB is supplied in Tape & Reel (TR) format. The Tape & Reel variant offers higher inventory availability and is suitable for automated assembly processes.

Q: Are the TPA122 series parts suitable for all TS489IST applications?

A: The TPA122DGN and TPA122DGNR are suitable for applications where the output power specification of 70mW per channel at 8Ohm load is acceptable. The minimum supply voltage of 2.5V (compared to 2.2V for TS489IST) must be verified. These parts include enhanced protection features (Short-Circuit and Thermal Protection) and are recommended for designs prioritizing thermal management and fault tolerance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts (LM4810MM/NOPB, LM4810MMX/NOPB, TPA122DGN, and TPA122DGNR) are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the TS489IST.

Q: What is the package compatibility between TS489IST and substitute parts?

A: All substitute parts use 8-TSSOP or 8-MSOP packages with 0.118" (3.00mm) width, maintaining mechanical compatibility with the TS489IST footprint. The TPA122 series includes an exposed pad variant, which may provide improved thermal performance in high-power applications.

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

A: The LM4810MMX/NOPB (Tape & Reel format) and TPA122DGNR (Tape & Reel format) both carry Active product status and demonstrate high inventory levels (19,300 and 17,124 units respectively), indicating strong long-term supply chain support from Texas Instruments.