TFA9842J/N1,112

Overview

The TFA9842J/N1,112 is a two-channel audio power amplifier manufactured by NXP USA Inc. It operates on a supply voltage of 9V to 26V and delivers up to 7.5W per channel in Single-Ended (SE) mode or 15W in Bridge-Tied Load (BTL) mode at THD=10%. The device features fixed gains of 26dB for SE and 32dB for BTL configurations. It utilizes a 9-pin DBS9P package with an exposed die pad for thermal management.

Feature Summary

• Supports both Single-Ended and Bridge-Tied Load output configurations
• Includes built-in short-circuit and thermal protection circuits
• Features standby and mute modes with low standby current consumption
• Eliminates switching plops during power-on and power-off transitions

Applications

• Television sets
• PC speakers
• Boom boxes
• Mini and micro audio receivers

Procurement Notes

Verify the component status as discontinued before procurement planning. Confirm that the 9-DBSP through-hole package aligns with existing PCB footprints. Ensure design compatibility with the fixed gain specifications and required supply voltage range for the target application environment.

Selection Notes

Select this amplifier for applications requiring dual-channel audio amplification without external volume control circuitry. The fixed gain settings simplify design complexity. Consider the thermal resistance characteristics when designing heatsinking solutions for high-power operation scenarios.

Part Context

This component belongs to the TFA984 series of audio amplifiers. It is pin-compatible with the TFA9841J and TFA9843J variants. The primary distinction lies in the functionality of specific pins, such as mode selection versus volume control capabilities found in other family members.

Replacement Considerations

Pin-compatible substitutes include TFA9841J and TFA9843J. Verify functional differences regarding pin assignments and gain configurations before substitution.