LM339FJ-E2

Overview

The LM339FJ-E2 is a quad analog comparator manufactured by ROHM Semiconductor, designed for general-purpose applications. It features four independent channels within a single TSSOP-B14 package. The device supports a wide operating supply voltage range from 3 V to 32 V and operates with low power consumption of approximately 1.2 mA. Key electrical specifications include a maximum input offset voltage of 4.5 mV, an input bias current of 50 nA, and a typical response time of 1 µs. It utilizes open-collector outputs capable of sinking up to 16 mA per channel.

Feature Summary

• Ground-sensed input and output capability allowing operation down to zero volts
• Wide operating supply voltage range suitable for diverse power environments
• Low offset voltage ensuring accurate signal comparison
• Open collector output configuration for flexible interfacing

Applications

• General purpose voltage monitoring circuits
• Temperature sensing systems using thermistors or sensors
• Over-voltage protection circuits
• Logic level translation between different voltage domains

Procurement Notes

Verify the specific suffix 'E2' against the manufacturer's latest documentation to confirm pinout compatibility and RoHS status. Confirm that the TSSOP-B14 package dimensions match your PCB footprint requirements. Check the current lifecycle status as this series may be subject to obsolescence notices; ensure availability aligns with production timelines before finalizing procurement plans.

Selection Notes

Select this component when a quad comparator with ground-referenced inputs is required. The low input bias current makes it suitable for high-impedance sensor interfaces. Ensure the application does not exceed the maximum supply voltage of 32 V. Consider thermal dissipation limits if multiple channels are driven near their maximum output current capacity simultaneously in enclosed environments.

Part Context

This part belongs to the LM339 family of quad comparators produced by ROHM Semiconductor. It shares functional similarities with industry-standard equivalents but offers specific packaging and electrical characteristics tailored for surface-mount assembly. The device is categorized under analog comparators and amplifier ICs, serving as a fundamental building block for linear circuit design requiring voltage threshold detection.

Replacement Considerations

Direct substitutes include other quad comparators with similar pinouts and electrical specs, such as the LM339N or LM339DR. Verify that any replacement maintains the same open-collector output structure and supply voltage range. Cross-reference datasheets for differences in input offset voltage and response time to ensure performance parity.