KA393

Overview

The KA393 is a dual differential comparator manufactured by Fairchild Semiconductor, designed for operation from a single power supply over a wide voltage range. It features two independent comparators within an 8-pin package, available in DIP and SOIC formats. The device operates with a supply voltage between 2V and 36V, or ±1V to ±18V for dual supplies. Key electrical characteristics include a maximum input offset voltage of 5mV at 5V, a maximum input bias current of 0.25µA, and a typical output current capability of 18mA. The standard operating temperature range is 0°C to 70°C.

Feature Summary

• Dual independent voltage comparators integrated into a single compact package
• Wide single-supply operating voltage range supporting diverse system requirements
• Open-collector output configuration allowing flexible interfacing with various logic families

Applications

• General-purpose voltage monitoring circuits
• Threshold detection systems
• Simple analog-to-digital conversion interfaces

Procurement Notes

Verify the specific package variant (DIP or SOIC) required for your PCB layout before ordering. Confirm that the open-collector output type aligns with your downstream logic level requirements. Check current availability status as this component may be subject to lifecycle changes or discontinuation by the manufacturer. Ensure supply voltage limits are respected during design validation.

Selection Notes

Select the KA393 when a cost-effective dual comparator solution is needed for low-speed applications. Consider the open-collector output nature, which requires external pull-up resistors for proper high-state voltage levels. Evaluate the 5mV offset voltage specification against your signal precision needs. Compare performance metrics with modern equivalents if higher speed or lower power consumption is critical for the target application.

Part Context

The KA393 belongs to the broader family of dual differential comparators, functionally similar to industry-standard parts like the LM393. It serves as a fundamental building block for analog signal processing tasks where precise voltage comparison is necessary. Fairchild Semiconductor developed this component to provide reliable performance in commercial electronic devices requiring simple threshold detection capabilities.

Replacement Considerations

The LM393 is a widely recognized pin-compatible alternative offering similar electrical specifications. Verify that any substitute maintains the same 8-pin package footprint and open-collector output structure. Ensure the replacement part supports the required supply voltage range and operating temperature conditions specified in the original design.