TDA8944AJ/N2,112

Overview

The TDA8944AJ is a dual-channel audio power amplifier featuring Bridge-Tied Load (BTL) architecture with an all-NPN output stage. It delivers 2 x 7 W into an 8 Ω load at 12 V supply. The device includes DC gain control via pin GC, adjustable from +30 dB to -50 dB. It operates within a 4.5 V to 18 V range and features standby/mute logic. Protection circuits include short-circuit and thermal shutdown. The component is housed in a 17-pin DBS power package.

Feature Summary

• DC gain control for volume adjustment or preset gain
• Soft clipping and low standby current operation
• Integrated short-circuit and thermal protection mechanisms
• No on/off switching plops during power transitions

Applications

• Mains fed applications such as TV sound systems
• PC audio subsystems
• Portable audio equipment

Procurement Notes

Verify the specific ordering suffix and manufacturer status before procurement. Confirm that the component meets current environmental compliance standards required for the target application. Check for availability of the original Philips Semiconductors documentation versus updated NXP specifications.

Selection Notes

Select this amplifier for designs requiring precise DC voltage-based gain adjustment. Ensure the PCB layout accommodates the 17-pin DBS package and provides adequate thermal dissipation for the mounting base. Verify input coupling capacitor values to maintain desired low-frequency response characteristics.

Part Context

This component belongs to the TDA8944 series of audio amplifiers. It is pin-compatible with the TDA8944J variant. The datasheet indicates compatibility with the TDA8946AJ and TDA8580J for printed-circuit board design purposes, allowing for potential layout reuse across these specific family members.

Replacement Considerations

The TDA8944J is officially confirmed as a pin-compatible alternative. Designers may consider the TDA8946AJ and TDA8580J for PCB layout compatibility, though functional equivalence requires verification against specific application requirements.

FAQ

How is the operating mode selected?

The MODE pin selects between standby, mute, and operating modes based on the applied DC voltage level relative to the supply voltage.

What protects the outputs from short circuits?

The device uses missing current detection for ground/supply shorts and absolute-current measurement for load shorts, switching the stage to standby if thresholds are exceeded.