LM339APT

Overview

The LM339APT is a quad voltage comparator manufactured by STMicroelectronics, housed in a 14-SOIC surface-mount package. It operates on a single supply voltage ranging from 2 V to 32 V or dual supplies of ±1 V to ±16 V. The device features four independent precision comparators with an open-collector output type compatible with TTL, DTL, ECL, MOS, and CMOS logic families. Key electrical specifications include a maximum input offset voltage of 5 mV at 30 V, a typical input bias current of 0.25 µA at 5 V, and a maximum quiescent supply current of 2.5 mA. The unit supports an operating temperature range from 0°C to +70°C.

Feature Summary

• Integrates four independent precision-voltage comparators within a single integrated circuit
• Features an open-collector output structure ensuring compatibility with various digital logic families including TTL and CMOS
• Designed for operation from a wide single power supply range or split power supplies
• Input common-mode voltage range includes ground potential even when powered by a single supply

Applications

• General-purpose analog signal comparison circuits
• Voltage monitoring systems requiring low-power operation
• Logic level shifting between different voltage domains
• Temperature sensing interfaces using thermistor bridges

Procurement Notes

Verify the specific suffix 'APT' against official STMicroelectronics documentation to confirm exact packaging and tape-and-reel specifications. Ensure the selected variant matches the required industrial temperature range and pinout configuration for your PCB layout. Cross-reference ordering codes with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a quad comparator solution is needed with low supply current consumption and wide voltage tolerance. Consider the SOIC-14 package constraints for board space. Evaluate if the open-collector output requires external pull-up resistors suitable for the target logic voltage levels. Compare performance metrics against lower-speed alternatives if propagation delay is not critical.

Part Context

This part belongs to the LM339 family of quad comparators, widely used in industrial and consumer electronics. It serves as a standard solution for applications requiring multiple voltage threshold detections without complex external circuitry. The device is often utilized in power management units and sensor interface designs where reliability and low cost are prioritized.

Replacement Considerations

Compatible substitutes include the LM339DT and LM339ADT from STMicroelectronics, which share similar electrical characteristics and pinouts. Verify that any replacement maintains the same package dimensions and thermal performance requirements.