TDA1557Q/N2,112

Overview

The TDA1557Q/N2,112 is a monolithic integrated class-B output amplifier in a 13-lead single-in-line plastic power package. It contains two 22 W amplifiers in BTL configuration primarily developed for car radio applications. The device features a fixed gain of 46 dB and operates within a positive supply voltage range of 6.0 to 18 V. Key electrical parameters include a total quiescent current of 80 mA typical, an input impedance of 25 kΩ, and a supply voltage ripple rejection of 45 dB. It provides AC and DC short-circuit safety, load dump protection up to 45 V, and reverse polarity safety.

Feature Summary

• Integrated loudspeaker protection circuit that limits DC voltage across the speaker to 1 V during ground shorts.
• Mute and stand-by switch functionality with low switching current requirements.
• Bridge-tied-load (BTL) architecture delivering high output power with minimal external components.
• Robust protection against electrostatic discharge, thermal overload, and load dump conditions.

Applications

• Stereo car radio power amplification
• Automotive audio systems requiring bridge-tied-load configurations

Procurement Notes

Verify the specific ordering suffix N2,112 against the manufacturer's latest documentation to confirm pinout and packaging details. Ensure compatibility with the 13-lead DIL plastic SOT141R package dimensions. Confirm that the component meets the required automotive environmental standards for your specific application environment.

Selection Notes

Select this component for applications requiring a dual-channel BTL amplifier with built-in speaker protection. Consider the fixed 46 dB gain and 13-lead SIL package constraints. Evaluate the thermal resistance characteristics for adequate heat dissipation in the target enclosure design without excessive external cooling.

Part Context

The TDA1557Q belongs to the Philips Semiconductors (now NXP) TDA series of audio power amplifiers designed for automotive use. It is part of a family including variants like the TDA1551Q and TDA1552Q, which share similar BTL architectures but may differ in diagnostic features or exact power ratings. This specific model emphasizes robust protection and simplicity for standard car radio implementations.

Replacement Considerations

Check datasheets for TDA1551Q and TDA1552Q as potential functional equivalents within the same product family. Verify pin compatibility and thermal performance before substitution.