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Product Detailed Parameters
- Description：IC AMP AB MONO 367MW 8MINISO
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Class AB
- Output Type：1-Channel (Mono)
- Max Output Power x Channels @ Load：367mW x 1 @ 16Ohm
- Voltage - Supply：2V ~ 5.5V
- Features：Differential Inputs, Short-Circuit Protection, Standby
- Mounting Type：Surface Mount
- Supplier Device Package：8-MiniSO
- Package / Case：8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Operating Temperature：-40°C ~ 85°C (TA)
- Grade：-
- Qualification：-
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Overview
The TS421IST is a monaural audio power amplifier manufactured by STMicroelectronics, housed in an 8-MiniSO package. It operates from a supply voltage of 2V to 5.5V and features an active low standby mode that reduces current consumption to 10nA typical. The device delivers up to 367mW into a 16Ω load at 5V with 10% THD+N, or 295mW at 5V and 110mW at 3.3V with 1% THD+N. It includes short-circuit limitation, ON/OFF click reduction circuitry, and a high signal-to-noise ratio of 95dB(A) at 5V.
Feature Summary
- Operates in BTL mode to drive 16 or 32 ohm earpiece or receiver speakers without bulky output capacitors.
- Features externally controlled standby mode for significant power savings.
- Includes ON/OFF click reduction circuitry to minimize audible switching noise.
- Configurable via external gain-setting resistors or available in fixed gain versions.
Applications
- 16/32 ohms earpiece or receiver speaker driver
- Mobile and cordless phones (analog / digital)
- PDAs & computers
- Portable appliances
Procurement Notes
Verify the specific MiniSO8 package configuration and tape-and-reel availability when sourcing this component. Confirm that the active low standby logic aligns with system control requirements, as the TS419 variant uses active high standby. Ensure compatibility with existing PCB footprints designed for the 8-MiniSO form factor.
Selection Notes
Select the TS421IST for applications requiring low-voltage operation down to 2V and minimal quiescent current. Choose this model over the TS419 when an active low standby signal is preferred. Consider the MiniSO8 package size constraints against thermal dissipation needs, as the junction-to-ambient thermal resistance differs from larger packages.
Part Context
The TS421IST belongs to the TS419/TS421 family of 360mW mono amplifiers. While the TS419 utilizes an active high standby mode, the TS421 specifically employs an active low standby mode. Both share identical electrical characteristics regarding power output, efficiency, and protection features, differing primarily in standby control polarity.
Replacement Considerations
Public confirmed substitute part numbers include LM4889MA/NOPB and LM4889MAX/NOPB from Texas Instruments.
FAQ
How does the standby mode function differ between TS419 and TS421?
The TS421 enters standby mode when the standby pin is pulled low (active low), whereas the TS419 enters standby when the pin is pulled high (active high).
What is the maximum output power capability of the TS421IST?
The device can deliver up to 367mW into a 16Ω load at 5V with a maximum THD+N of 10%, or 295mW at 5V with 1% THD+N.
