CA3290BT

Overview

The CA3290BT is a BiMOS dual voltage comparator manufactured by Harris Corporation. It integrates MOSFET input stages with bipolar outputs on a single monolithic chip. The device features very high input impedance and extremely low input currents, making it suitable for high-impedance sensor applications. It operates from single or dual supplies, with the common mode input range including ground even in single-supply configurations. The output is compatible with TTL, DTL, ECL, MOS, and CMOS logic systems.

Feature Summary

• BiMOS architecture combining MOSFET inputs for high impedance with bipolar outputs for logic compatibility
• Extremely low input current drain suitable for battery operation and high source impedance sensors
• Wide common mode input voltage range that extends below the negative supply rail
• Output voltage levels compatible with various digital logic families including TTL and CMOS

Applications

• High source impedance voltage comparators
• Long time delay circuits
• Square wave generators
• A/D converters
• Window comparators

Procurement Notes

Verify the manufacturer designation as Harris Corporation or Intersil Corporation, as production rights transferred between entities. Confirm the suffix BT corresponds to the specific package type and temperature rating required for your application. Ensure the component meets the necessary environmental standards if used in regulated industries. Cross-reference the datasheet revision date to confirm parameter consistency.

Selection Notes

Select this component when high input impedance is critical to prevent loading of high-impedance signal sources. The BiMOS design offers a balance between the noise characteristics of bipolar devices and the input impedance of MOS devices. Consider the output drive capability against the load requirements of the connected logic family. Evaluate the supply voltage range to ensure compatibility with the system power rails.

Part Context

The CA3290 series belongs to the class of analog mixed-signal integrated circuits, specifically voltage comparators. Harris Corporation was a prominent manufacturer of such components before its acquisition by Intersil. These devices are part of a broader family of precision analog components designed for industrial and commercial applications requiring reliable signal comparison with minimal input bias current.

Replacement Considerations

The CA3290A and CA3290E are documented variants within the same functional family from Intersil Corporation. Verify pinout compatibility and electrical parameter tolerances before substituting. Other dual comparators with MOSFET inputs may serve as alternatives if specific Harris/Intersil parameters are not strictly required.