KA393A

Overview

The KA393A is a dual voltage comparator from onsemi, part of the KA393 series. It features two independent comparators designed for single power supply operation over a wide voltage range. Key electrical parameters include a maximum input offset voltage of 4 mV to 5 mV and an input bias current of 250 nA. The device supports a supply voltage range of 2 V to 36 V (single) or ±1 V to ±18 V (dual). It offers an open collector output with a typical sink current of 18 mA and a response time of 1.4 µs. The quiescent supply current is typically 1 mA to 2.5 mA.

Feature Summary

• Dual independent voltage comparators integrated into a single package
• Wide single-supply operating voltage range from 2 V to 36 V
• Open collector outputs capable of sinking up to 18 mA
• Low input bias current for high-impedance signal compatibility

Applications

• General-purpose voltage monitoring circuits
• Threshold detection systems
• Power supply control logic
• Over-voltage protection circuits

Procurement Notes

Verify component authenticity through authorized onsemi distributors. Confirm package type (SOIC-8 or DIP-8) matches design requirements. Check RoHS compliance status as specifications may vary by manufacturing lot. Ensure storage conditions adhere to semiconductor handling guidelines to prevent moisture sensitivity damage prior to assembly.

Selection Notes

Select this component when dual comparator functionality is required in a compact form factor. Consider the open-collector output structure for interfacing with various logic families. Evaluate the 1.4 µs response time against system speed requirements. Verify that the 18 mA output drive capability meets load demands without external buffering.

Part Context

The KA393A belongs to the KA393/KA393A/KA2903 family of dual comparators. This series is widely used in industrial and consumer electronics for analog signal processing. The device is manufactured by onsemi, formerly Fairchild Semiconductor, leveraging established bipolar comparator technology for reliable performance across temperature ranges.

Replacement Considerations

Compatible substitutes include the LM393 and TL393. These parts share similar pinouts and electrical characteristics. Verify pin compatibility and output stage specifications before substitution. Ensure thermal and voltage ratings meet or exceed original design constraints.