TDA8551T/N1,112

Overview

The TDA8551T/N1,112 is a single-channel 1 W Bridge-Tied Load (BTL) audio power amplifier manufactured by NXP Semiconductors. It integrates a digital volume control and standby/mute logic within an 8-pin SO package (SOT96-1). The device delivers 1 W output power to an 8 Ω load at THD = 10% using a 5 V supply. Key electrical parameters include a supply voltage range of 2.7 V to 5.5 V, quiescent current of 61 mA, and standby current of 10 μA. Voltage gain ranges from -60 dB to +20 dB across 64 steps, with total harmonic distortion typically at 0.15%.

Feature Summary

• Integrates a one-pin digital volume control allowing attenuation adjustment in 64 discrete steps via UP/DOWN pulses.
• Features a complementary CMOS output stage with low saturation voltage for efficient BTL operation.
• Includes internal thermal shutdown protection and short-circuit safety to ground, VP, and across the load.
• Supports CMOS-compatible standby and mute modes controlled by the MODE pin to minimize power consumption.

Applications

• Portable consumer products
• Personal computers
• Telephony

Procurement Notes

Verify the specific ordering suffix N1,112 against the latest NXP documentation to confirm package type and compliance status. Confirm that the SO8 plastic small outline package matches the design requirements. Check for any superseded data sheets or product discontinuation notices prior to finalizing procurement plans.

Selection Notes

Select this component for designs requiring a compact, single-channel audio solution with integrated digital volume control. Ensure the application supports the specified 2.7 V to 5.5 V supply range and utilizes an 8 Ω load impedance for optimal performance. Verify that the system can accommodate the required external decoupling capacitors for ripple rejection and stability.

Part Context

This part belongs to the TDA8551 series of audio amplifiers. The 'T' designation indicates the SO8 surface-mount package variant, while the base model may also be available in DIP8. It is designed for low-power audio applications where space constraints and integrated control features are prioritized over high-output power capabilities.

Replacement Considerations

Consult official NXP documentation for verified substitute part numbers. No public substitutes are confirmed in the provided source material.