LM139DT

Overview

The LM139DT is a quad precision-voltage comparator manufactured by STMicroelectronics, housed in a 14-SOIC surface-mount package. It operates from 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 channels with an open-collector output compatible with TTL, DTL, ECL, MOS, and CMOS logic families. Key electrical specifications include a maximum input offset voltage of 5 mV, a typical supply current of 1.1 mA, and a response time of 1.3 µs. It supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Four independent precision-voltage comparators designed for single or split power supply operation
• Input common-mode voltage range includes ground potential even when powered by a single supply
• Open-collector outputs provide compatibility with various digital logic families including TTL and CMOS
• Low supply current consumption that remains largely independent of the supply voltage level

Applications

• Precision voltage monitoring circuits
• Level detection systems
• Logic interface adapters between analog signals and digital processors
• Window comparator configurations

Procurement Notes

Verify the specific suffix against the manufacturer datasheet to confirm package type and tape-and-reel specifications. Ensure the ordering code matches the required industrial temperature grade and RoHS compliance status. Cross-reference the distributor part number with the official STMicroelectronics catalog to avoid substitution errors during procurement.

Selection Notes

Select this component when multiple independent comparison functions are required within a compact surface-mount footprint. Consider the wide single-supply voltage range and ground-referenced input capability for battery-powered or low-voltage applications. Evaluate the open-collector output structure to determine if external pull-up resistors are necessary for the target logic family voltage levels.

Part Context

This device belongs to the LM139/LM239/LM339 family of quad comparators. While sharing core architecture, variations exist in offset voltage specifications and temperature ranges across the family members. The DT suffix specifically denotes the 14-SOIC surface-mount package variant, distinguishing it from through-hole DIP options available in the same product line.

Replacement Considerations

LM239DT

FAQ

Can the LM139DT operate with a single-ended power supply?

Yes, the device is specifically designed to operate from a single power supply voltage ranging from 2 V to 32 V.

What is the output configuration of the LM139DT?

The outputs are open-collector type, allowing them to drive loads at different voltage levels than the supply voltage.