TS487IST Equivalent & Substitute Parts

Part Overview

The TS487IST is a Class AB stereo headphone amplifier IC manufactured by STMicroelectronics, housed in an 8-MiniSO package. This device delivers 108mW per channel at 16Ω load across a 2V to 5.5V supply range and includes integrated depop, short-circuit protection, and standby features. The TS487IST is classified as obsolete, necessitating identification of functionally equivalent active alternatives for new designs and production continuity.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	Headphones, 2-Channel (Stereo)
Max Output Power @ 16Ω	108mW x 2
Supply Voltage Range	2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package Family	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Protection Features	Depop, Short-Circuit Protection, Standby
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Class AB amplifier topology
2-Channel stereo headphone output configuration
Surface mount technology with compatible 8-pin package footprint (8-TSSOP, 8-MSOP, 8-VSSOP, or 8-HVSSOP)
Operating temperature range of -40°C to 85°C
Supply voltage range encompassing 2V to 5.5V operation
RoHS3 compliance and MSL 1 rating

Secondary Compatibility Factors:

Output power capability at specified load impedance
Integrated protection features (depop, thermal protection, short-circuit protection)
Active product status for long-term availability

Substitute parts are grouped into two categories based on output power capability relative to the TS487IST specification of 108mW @ 16Ω:

Group A (Higher Output Power): Parts exceeding 108mW @ 16Ω output capability Group B (Lower Output Power): Parts with reduced output capability but compatible electrical and mechanical parameters

Parameter Comparison

Part Number	Manufacturer	Type	Output Power @ Load	Supply Voltage	Package	Status	Inventory
TS487IST	STMicroelectronics	Class AB	108mW x 2 @ 16Ω	2V ~ 5.5V	8-MiniSO	Obsolete	890 Pcs
TPA6111A2DGN	Texas Instruments	Class AB	150mW x 2 @ 16Ω	2.5V ~ 5.5V	8-HVSSOP	Active	5740 Pcs
TPA6111A2DGNR	Texas Instruments	Class AB	150mW x 2 @ 16Ω	2.5V ~ 5.5V	8-HVSSOP	Active	3320 Pcs
LM4810MM/NOPB	Texas Instruments	Class AB	105mW x 2 @ 16Ω	2V ~ 5.5V	8-VSSOP	Active	1500 Pcs
LM4810MMX/NOPB	Texas Instruments	Class AB	105mW x 2 @ 16Ω	2V ~ 5.5V	8-VSSOP	Active	19300 Pcs
TPA122DGN	Texas Instruments	Class AB	70mW x 2 @ 8Ω	2.5V ~ 5.5V	8-HVSSOP	Active	1860 Pcs
TPA122DGNR	Texas Instruments	Class AB	70mW x 2 @ 8Ω	2.5V ~ 5.5V	8-HVSSOP	Active	17124 Pcs

Engineering Selection Recommendations

Group A Substitutes (Higher Output Power):

The TPA6111A2DGN and TPA6111A2DGNR deliver 150mW per channel at 16Ω, exceeding the TS487IST specification by 42mW per channel. Both devices are manufactured by Texas Instruments, carry active product status, and maintain RoHS3 compliance with MSL 1 rating. The TPA6111A2DGN is supplied in tube packaging, while the TPA6111A2DGNR is supplied in cut tape format. These parts are suitable for applications requiring higher output power capability within the same supply voltage envelope. The 8-HVSSOP package is mechanically compatible with the TS487IST footprint family.

Group A Substitute (Matched Output Power):

The LM4810MM/NOPB and LM4810MMX/NOPB (Boomer® series) deliver 105mW per channel at 16Ω, closely matching the TS487IST specification. Both are active products with RoHS3 compliance and MSL 1 rating. The LM4810MM/NOPB is supplied in cut tape format with 1500 units in stock, while the LM4810MMX/NOPB is supplied in tape and reel format with significantly higher inventory (19300 units). Both operate across the full 2V to 5.5V supply range and employ the 8-VSSOP package, which is mechanically compatible with the TS487IST footprint family.

Group B Substitutes (Lower Output Power):

The TPA122DGN and TPA122DGNR deliver 70mW per channel at 8Ω load impedance. These parts are active products with RoHS3 compliance and MSL 1 rating. The TPA122DGN is supplied in tube packaging (1860 units in stock), while the TPA122DGNR is supplied in tape and reel format (17124 units in stock). These substitutes are applicable only in applications where the load impedance is 8Ω or higher and reduced output power is acceptable. The minimum supply voltage for TPA122 devices is 2.5V, compared to 2V for the TS487IST.

Frequently Asked Questions (FAQ)

Q: Can the TPA6111A2DGN directly replace the TS487IST without PCB modifications?

A: The TPA6111A2DGN employs the 8-HVSSOP package, which shares the same 0.118" (3.00mm) width and pin pitch as the TS487IST 8-MiniSO package. Pin-to-pin compatibility requires verification against the specific pinout diagrams for both devices. The mechanical footprint is compatible, but electrical signal routing must be confirmed.

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

A: Both devices are electrically identical Class AB stereo headphone amplifiers with 105mW output per channel at 16Ω. The primary difference is packaging format: LM4810MM/NOPB is supplied in cut tape format, while LM4810MMX/NOPB is supplied in tape and reel format. The tape and reel variant (MMX) has significantly higher inventory availability (19300 units versus 1500 units).

Q: Why do the TPA122 devices specify output power at 8Ω instead of 16Ω?

A: The TPA122DGN and TPA122DGNR are rated for 70mW per channel at 8Ω load impedance. Output power capability varies with load impedance; lower impedance loads typically result in higher current delivery. These devices are suitable for 8Ω or higher impedance applications. Direct comparison with the TS487IST (rated at 16Ω) requires load impedance consideration in the target application.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance certification and MSL 1 (unlimited moisture sensitivity) rating, matching the TS487IST specification. All parts are suitable for applications with RoHS3 compliance requirements.

Q: What is the minimum supply voltage for each substitute?

A: The LM4810MM/NOPB and LM4810MMX/NOPB operate from 2V to 5.5V, matching the TS487IST specification. The TPA6111A2DGN, TPA6111A2DGNR, TPA122DGN, and TPA122DGNR operate from 2.5V to 5.5V, requiring a minimum 0.5V higher supply voltage than the TS487IST. Applications operating below 2.5V supply voltage must use the LM4810 series.

Q: Which substitute offers the best inventory availability?

A: The LM4810MMX/NOPB offers the highest inventory level at 19300 units in stock. This part delivers 105mW per channel at 16Ω, closely matching the TS487IST specification, and maintains full compatibility with the 2V to 5.5V supply range.

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