LM139N

Overview

The LM139N is a quad precision voltage comparator manufactured by STMicroelectronics, housed in an 8-pin PDIP package. It operates from a single power supply ranging from 2 V to 36 V or dual supplies of ±1 V to ±18 V. The device features four independent channels with a typical response time of 1.3 µs and a maximum input offset voltage of 5 mV. It draws a typical supply current of 1.1 mA and supports output compatibility with TTL, DTL, ECL, MOS, and CMOS logic families.

Feature Summary

• Four independent precision-voltage comparators designed for single-supply operation
• Input common-mode voltage range includes ground potential
• Outputs are compatible with various digital logic families including TTL and CMOS
• Low power consumption with supply current independent of voltage level

Applications

• Precision voltage monitoring circuits
• Level detection systems
• Peak hold circuits
• Simple time delay generation

Procurement Notes

Verify the specific suffix 'N' corresponds to the PDIP-8 through-hole package variant rather than surface-mount options like 'DT'. Confirm RoHS compliance status and check for any lead-free manufacturing updates on the official datasheet before finalizing procurement specifications.

Selection Notes

Select this component when a quad comparator configuration is required with single-supply capability and ground-referenced inputs. It is suitable for applications needing low power consumption and broad logic output compatibility without requiring high-speed switching performance exceeding 1.3 µs response times.

Part Context

This part belongs to the LM139/LM239/LM339 family of analog comparators. While sharing core architecture, the 'LM139' designation typically indicates military-grade temperature ranges (-55°C to +125°C) compared to commercial variants. The 'N' suffix specifically denotes the plastic dual-in-line package format.

Replacement Considerations

Compatible substitutes include LM339N and LM239N. Verify that alternative parts match the required operating temperature range and pinout compatibility before integration into existing designs.