TDA2611A/N5,112

Overview

The TDA2611A/N5,112 is a monolithic 5 W audio power amplifier by NXP Semiconductors housed in a 9-lead SIL plastic package (SOT110B). It operates on a supply voltage range of 6 to 35 V with a maximum repetitive peak output current of 1.5 A. The device delivers typical output powers of 4.5 W at 18 V into an 8 Ω load and 5 W at 25 V into a 15 Ω load. It features thermal protection, a fixed integrated closed-loop gain, and simple quiescent current setting. The operating ambient temperature spans from -25 °C to +150 °C.

Feature Summary

• Single in-line construction designed for easy mounting in mains-fed apparatus
• Integrated thermal protection circuitry for enhanced reliability
• Fixed integrated closed-loop gain with simple quiescent current adjustment
• Extremely low external component count requirement

Applications

• Mains-fed audio apparatus
• Ceramic pickup amplifiers
• General-purpose audio power amplification
• Consumer electronics requiring high supply voltage operation

Procurement Notes

Verify the specific ordering suffix against the latest official NXP documentation to confirm exact package variant and compliance status. Product specifications may evolve; always consult the most recent datasheet before finalizing designs. Ensure compatibility with existing thermal management solutions given the wide operating temperature range.

Selection Notes

Select this component for applications requiring a robust, single-supply audio amplifier with minimal external parts. The high input impedance simplifies driver interface design. Consider the thermal resistance requirements carefully when designing for maximum power output, as heat dissipation is critical for maintaining performance within the specified ambient temperature limits.

Part Context

This part belongs to the TDA2611 series of audio power amplifiers. It is a legacy product originally published in November 1982. While still referenced in historical contexts, newer alternatives may offer improved efficiency or integration. It serves as a foundational solution for basic high-voltage audio amplification tasks where simplicity and ruggedness are prioritized over advanced digital features.

Replacement Considerations

No official direct replacement part numbers are provided in the source material. Designers should evaluate modern equivalents based on pin compatibility, power ratings, and thermal characteristics if discontinuation occurs.

FAQ

How can the input impedance be increased?

The input impedance can be increased by applying a capacitor and resistor between pins 5 and 9.

What is the maximum supply voltage allowed?

The maximum supply voltage (Vp) is 35 V.

Is pin 3 connected internally?

No, pin 3 is not connected internally.