LM239APT

Overview

The LM239APT is a quad low-power voltage comparator manufactured by STMicroelectronics, housed in a 14-pin TSSOP surface-mount package. It features four independent precision comparators designed for single or split power supply operation. Key electrical parameters include a supply voltage range of 2 V to 36 V (single) or ±1 V to ±18 V (dual), and a typical quiescent supply current of 1.1 mA to 2 mA. The device offers a maximum input offset voltage of 2 mV, an input bias current of 100 nA, and a typical response time of 1.3 µs. Outputs are compatible with TTL, DTL, ECL, MOS, and CMOS logic families.

Feature Summary

• Four independent precision-voltage comparators integrated into a single low-power package
• Input common-mode voltage range includes ground when operated from a single supply
• Open-collector outputs compatible with various digital logic families including TTL and CMOS
• Wide operating temperature range suitable for industrial applications

Applications

• Precision voltage monitoring and threshold detection circuits
• Level shifting and digital interface buffering
• On-off temperature control systems
• Supply voltage supervision and monitoring

Procurement Notes

Verify the specific suffix 'APT' corresponds to the TSSOP-14 package and tape-and-reel orientation required for your assembly line. Confirm RoHS compliance status and moisture sensitivity level (MSL) ratings prior to soldering. Ensure the ordering quantity matches the manufacturer's standard packaging multiples to avoid additional handling fees or cut-tape premiums.

Selection Notes

Select this component when a quad comparator configuration is required with low static power consumption. The open-collector output allows flexible pull-up voltage selection for interfacing with different logic levels. Consider the 1.3 µs response time for speed requirements and the 2 mV max offset voltage for accuracy needs. Verify that the 14-TSSOP footprint fits within the available PCB area constraints.

Part Context

This part belongs to the LM139/LM239/LM339 family of analog comparators. The 'LM239' designation indicates commercial/industrial grade performance compared to the military-grade LM139 or the tighter tolerance LM339A variants. The 'APT' suffix specifically denotes the TSSOP surface-mount package type, distinguishing it from through-hole PDIP or plastic DIP alternatives.

Replacement Considerations

LM239PT: Pin-compatible alternative in a TSSOP package. LM239ADT: Similar quad comparator in a SOIC-14 package requiring layout adaptation. LM339AP: Higher precision variant with lower offset voltage specifications.