TS488IST Equivalent & Substitute Parts

Part Overview

The TS488IST is a Class AB stereo headphone amplifier IC manufactured by STMicroelectronics in an 8-MiniSO surface mount package. This device delivers 130mW per channel at 16Ω load and operates across a 2.2V to 5.5V supply voltage range. The TS488IST is classified as obsolete, necessitating identification of equivalent substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across output power, supply voltage, thermal operating range, and package form factor specifications.

Substiute Parts

TS488IST

STMicroelectronicsIn Stock: 3478TS488IST Datasheet

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LM4809MM/NOPB

National SemiconductorIn Stock: 4542LM4809MM/NOPB Datasheet

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LM4809MMX/NOPB

Texas InstrumentsIn Stock: 5918LM4809MMX/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TS488IST are identified based on strict equivalence across the following critical parameters:

Functional Compatibility Criteria:

• Output configuration: 2-Channel (Stereo) headphone amplifier
• Amplifier topology: Class AB
• Package form factor: 8-pin surface mount (8-TSSOP, 8-MSOP, 0.118" width, 3.00mm)
• Operating temperature range: -40°C ~ 85°C (TA)
• Supply voltage range: Minimum 2.0V to maximum 5.5V
• Mounting type: Surface Mount

Acceptable Parameter Variations:

• Output power per channel may be equal to or greater than 105mW at 16Ω load
• Protective features may differ (thermal protection, shutdown, depop) provided core functionality is maintained
• Packaging format (Bulk or Tape & Reel) does not affect electrical substitution
• Manufacturer origin does not restrict substitution when all electrical and mechanical parameters align

The LM4809MM/NOPB and LM4809MMX/NOPB satisfy these criteria as direct substitutes, with output power of 105mW per channel representing a minor reduction from the TS488IST specification while maintaining full functional compatibility within typical headphone amplifier applications.

Parameter Comparison

Engineering Selection Recommendations

LM4809MMX/NOPB (Recommended Primary Substitute)

The LM4809MMX/NOPB is the preferred substitute for the obsolete TS488IST. This part is manufactured by Texas Instruments and maintains active product status, ensuring long-term availability and supply chain stability. The device carries ROHS3 compliance and MSL Level 1 certification, matching the environmental and regulatory requirements of the original TS488IST. The Tape & Reel packaging format aligns with the original part's distribution method. Output power specification of 105mW per channel at 16Ω load is sufficient for headphone amplifier applications within the TS488IST's intended use case.

LM4809MM/NOPB (Secondary Substitute)

The LM4809MM/NOPB, manufactured by National Semiconductor, provides equivalent electrical functionality and identical package specifications. This part is also in active production status. The primary distinction is Bulk packaging format rather than Tape & Reel, which may affect procurement and assembly processes depending on production volume requirements. MSL and RoHS compliance information is not specified for this variant.

Both substitute parts operate across the full -40°C to 85°C temperature range and support the 2V to 5.5V supply voltage specification, with the LM4809 series supporting operation down to 2.0V compared to the TS488IST minimum of 2.2V. Protective features differ slightly, with the LM4809 series incorporating thermal protection and shutdown functionality in place of the TS488IST's short-circuit protection, though both feature depop circuitry.

Frequently Asked Questions (FAQ)

Q: Can the LM4809MMX/NOPB directly replace the TS488IST in existing PCB designs?

A: Yes. Both devices use identical 8-pin surface mount packages (8-TSSOP, 8-MSOP, 0.118" width, 3.00mm) with compatible pinouts for stereo headphone amplifier applications. No PCB layout modifications are required.

Q: What is the significance of the 25mW output power difference between the TS488IST (130mW) and LM4809 series (105mW)?

A: The output power specification represents maximum rated capability at 16Ω load impedance. For typical headphone applications operating at lower impedance loads or reduced volume levels, the 105mW specification of the LM4809 series is functionally equivalent. Applications requiring the full 130mW output capability must evaluate load impedance and desired sound pressure level independently.

Q: Are there packaging format differences between LM4809MM/NOPB and LM4809MMX/NOPB?

A: The primary difference is packaging format. The LM4809MMX/NOPB is supplied in Tape & Reel (TR) format, matching the TS488IST distribution method. The LM4809MM/NOPB is supplied in Bulk format. Electrical specifications and device performance are identical between these two part numbers.

Q: Does the supply voltage range difference (TS488IST: 2.2V minimum vs. LM4809: 2.0V minimum) affect substitution?

A: No. The LM4809 series supports a wider supply voltage range, including operation at 2.0V. Designs operating at or above 2.2V experience no functional difference. Designs operating between 2.0V and 2.2V benefit from the extended range of the LM4809 series.

Q: What protective features should be considered when substituting the TS488IST?

A: The TS488IST includes short-circuit protection and standby functionality. The LM4809 series includes thermal protection and shutdown functionality. Both include depop circuitry. Thermal protection in the LM4809 series provides automatic current limiting at elevated junction temperatures, while the TS488IST's short-circuit protection responds to output load conditions. For most headphone amplifier applications, these feature sets are functionally equivalent.

Q: Is the LM4809MM/NOPB suitable for new production designs?

A: Yes. The LM4809MM/NOPB is in active production status and meets all electrical and mechanical substitution criteria. Selection between LM4809MM/NOPB and LM4809MMX/NOPB should be based on packaging format requirements (Bulk vs. Tape & Reel) and procurement volume specifications.

Q: Are there compliance or certification differences between the substitute parts?

A: The LM4809MMX/NOPB carries explicit ROHS3 compliance and MSL Level 1 certification, matching the TS488IST. The LM4809MM/NOPB compliance status is not specified in available documentation. For applications with strict regulatory requirements, the LM4809MMX/NOPB is the recommended choice.