KA2904

Overview

The KA2904 is a dual operational amplifier manufactured by Fairchild Semiconductor. It consists of two independent, high-gain amplifiers with internal frequency compensation. The device operates from a single power supply over a wide voltage range, featuring low supply current that remains essentially independent of the supply voltage magnitude. Key electrical characteristics include a large DC voltage gain of 100 dB, a unity-gain bandwidth of 1.1 MHz, and a low input bias current of 20 nA. The input common-mode voltage range includes the negative rail, allowing ground-level operation in single-supply systems.

Feature Summary

• Internal frequency compensation eliminates external component requirements
• Wide single-supply voltage operation capability
• Low power supply drain independent of voltage magnitude
• Input common-mode voltage range extends to the negative rail

Applications

• Transducer amplifiers
• DC gain blocks
• Electronic interfaces for logic systems

Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or its successor entities, given corporate acquisitions. Confirm the specific suffix indicates the correct package type and temperature grade. Ensure the datasheet revision matches the required specifications for your design. Check for RoHS compliance status if environmental regulations apply to your project.

Selection Notes

Select this component when a low-power, dual-channel solution is required for single-supply applications. The inclusion of the negative rail in the common-mode range makes it suitable for interfacing with ground-referenced signals without additional biasing networks. Consider the 1.1 MHz bandwidth for general-purpose signal conditioning tasks where high speed is not critical.

Part Context

This part belongs to the family of low-power dual operational amplifiers designed for automotive and industrial control systems. It serves as a cost-effective alternative to higher-speed op-amps in applications where power consumption and simplicity are prioritized over bandwidth. The internal compensation simplifies circuit layout and reduces bill-of-materials complexity.