LM139APT

Overview

The LM139APT is a quad precision voltage comparator from STMicroelectronics, featuring four independent comparators in a TSSOP-14 package. It operates on a single supply of +2V to +36V or dual supplies of ±1V to ±18V. Key electrical parameters include a typical supply current of 1.1mA, input bias current of 25nA, and input offset voltage of ±1mV typ (±2mV max for A-grade). The device offers a response time of 1.3μs, output saturation voltage of 250mV at 4mA sink, and supports TTL, DTL, ECL, MOS, and CMOS compatible outputs.

Feature Summary

• Four independent precision-voltage comparators designed for single or split power supply operation
• Input common-mode voltage range includes ground potential
• Outputs are compatible with various logic families including TTL, DTL, ECL, MOS, and CMOS
• Low power consumption with supply current largely independent of the supply voltage

Applications

• Precision voltage monitoring circuits
• Analog-to-digital conversion interfaces
• Level shifting and logic interface applications

Procurement Notes

Verify the specific suffix 'APT' against the manufacturer's official datasheet to confirm the exact temperature grade, package tolerance, and tape-and-reel specifications. Ensure the ordering code matches the required industrial or commercial operating temperature range and that the TSSOP-14 pinout aligns with the target PCB footprint design.

Selection Notes

Select this component when high precision is required alongside low power consumption in single-supply systems. The inclusion of ground in the common-mode input range simplifies circuit design for signals near zero volts. Consider the 1.3μs propagation delay for timing-sensitive applications and verify that the open-collector output configuration meets the load requirements of the downstream logic family.

Part Context

The LM139 series belongs to a long-standing family of quad comparators known for their versatility in analog signal processing. The LM139APT variant specifically denotes the commercial grade version packaged in a thin-shrink small-outline package, providing a compact solution for space-constrained designs while maintaining the robust performance characteristics of the broader LM139 family.

Replacement Considerations

Cross-reference with LM239APT for industrial temperature grades or LM339APT for tighter offset voltage specifications. Verify pin compatibility and electrical parameter overlaps before substituting.