LM239PW

Overview

The LM239PW is a quad differential voltage comparator manufactured by Texas Instruments, housed in a 14-pin TSSOP surface-mount package. It operates on a single supply voltage ranging from 2 V to 30 V or dual supplies up to ±15 V. The device features four independent comparators with open-collector outputs compatible with TTL and CMOS logic systems. Key electrical specifications include a maximum input offset voltage of 5 mV, an input bias current of 250 nA, and a propagation delay of 300 ns. It supports a maximum output sink current of 6 mA per channel and functions within a temperature range of 0°C to 70°C.

Feature Summary

• Quad differential architecture providing four independent comparison channels in a compact surface-mount package
• Open-collector output stage enabling direct interfacing with various digital logic families including TTL and CMOS
• Wide single-supply operating voltage range allowing operation down to 2 V without requiring dual power rails
• Input common-mode voltage range includes ground, permitting signal detection near the negative rail

Applications

• Battery-powered monitoring circuits due to low quiescent current consumption
• Voltage level detection and threshold sensing applications
• Interface between analog sensors and digital logic systems
• Window comparator configurations for over-voltage and under-voltage protection

Procurement Notes

Verify the specific suffix 'PW' corresponds to the TSSOP-14 package variant when sourcing. Confirm RoHS compliance status as manufacturing updates may affect environmental declarations. Ensure the selected distributor provides traceability documentation consistent with original equipment manufacturer standards. Cross-reference the full part number against the latest datasheet revision to validate pinout and electrical characteristics before finalizing procurement orders.

Selection Notes

Select this component when multiple independent voltage comparisons are required in space-constrained designs. The TSSOP-14 package offers a smaller footprint compared to traditional DIP options while maintaining identical electrical performance. Consider the open-collector output limitation which requires external pull-up resistors for proper high-state logic levels. Evaluate the 5 mV maximum input offset voltage against application sensitivity requirements to ensure accurate threshold detection.

Part Context

The LM239 belongs to the LMx39 family of quad comparators from Texas Instruments, sharing functional similarities with the LM339 and LM2901. While electrically comparable, the LM239 typically specifies a wider industrial temperature range than some commercial variants. The PW suffix denotes the plastic thin-shrink small-outline package, distinguishing it from through-hole PDIP or ceramic CDIP alternatives within the same product line.

Replacement Considerations

LM339PW: Electrically similar quad comparator with potentially different temperature grade specifications. LM2901PW: Comparable device often featuring tighter offset voltage parameters. Verify pin compatibility and thermal performance limits when substituting these alternatives.