KA339

Overview

The KA339 is a quad analog comparator manufactured by onsemi, designed for general-purpose voltage comparison applications. It features four independent channels within a single integrated circuit package. The device operates with an open collector output configuration, allowing flexible interfacing with various logic families including DTL, MOS, and TTL. It supports a wide supply voltage range from 2V to 36V or ±1V to ±18V. Key electrical characteristics include a maximum input offset voltage of 9mV and a typical response time of 1.3 microseconds. The component is available in through-hole DIP-14 packaging and functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Integrates four independent high-gain comparators for multi-channel signal processing
• Features open-collector outputs compatible with multiple logic standards
• Supports wide single or dual power supply voltage ranges
• Designed for commercial temperature operation environments

Applications

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

Procurement Notes

Verify the specific suffix designation when sourcing replacements, as package type and availability vary significantly between variants such as the through-hole KA339A and surface-mount KA339AD. Confirm RoHS compliance status and check current lifecycle status, as several versions are marked as obsolete or end-of-life. Ensure the selected substitute matches the required channel count and output configuration.

Selection Notes

Select this component when a cost-effective quad comparator solution is required for standard commercial applications. Consider the physical package constraints, choosing between DIP-14 for through-hole mounting or SOP-14 for surface mount technologies. Evaluate the need for low input bias current and ensure the operating temperature range aligns with the intended environmental conditions. Verify that the open-collector output interface meets the downstream logic requirements.

Part Context

The KA339 belongs to the broader family of quad analog comparators produced by onsemi. It shares functional similarities with industry-standard devices like the LM339 series but may exhibit differences in specific electrical parameters such as input offset voltage and supply current. This component represents a legacy part number often used in established designs requiring multiple comparison functions in a compact footprint.

Replacement Considerations

LM339DR2G is listed as a similar replacement option by onsemi.