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LM139J/PB

TILM139J/PB

Texas Instruments
Comparator Standard (General Purpose) Open-Collector, Open-Drain 14-CDIP
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Overview

The LM139J/PB is a high-performance quad independent voltage comparator designed to operate over a wide range of supply voltages from 2V to 36V. This specific variant is housed in a 14-pin Ceramic Dual-In-Line Package (CDIP) and is rated for extreme temperatures from -55C to 125C, making it suitable for high-reliability applications. The open-collector output architecture allows for easy level shifting and logical wired-OR connections in multi-channel monitoring systems.

Why Choose This Part

The device features a low input bias current of 0.1uA and a maximum quiescent current of 2.5mA, which minimizes loading on high-impedance signal sources. Its wide common-mode input voltage range includes ground, allowing for direct sensing near 0V even when operating from a single supply. The ceramic CDIP packaging provides superior thermal stability and hermetic sealing for harsh environments.

Applications

Limit Threshold Detection
Utilizing the four independent channels to monitor multiple voltage rails against a common reference in power sequencing.
Zero-Crossing Detectors
Converting sine waves or AC signals into square waves for timing and frequency measurement in industrial controls.
Oscillators and Pulse Generators
Building stable multivibrators or PWM generators where precision and wide supply range are required.
Level Shifting
Interfacing between different logic families (e.g., 12V CMOS to 5V TTL) using the open-collector output stage.

Key Specifications

Type Standard (General Purpose)
Output Type Open-Collector, Open-Drain
Mounting Type Through Hole
Package / Case 14-CDIP (0.300", 7.62mm)
Number of Elements 4
Operating Temperature -55degC ~ 125degC
Current - Output (Typ) 16mA @ 5V
Supplier Device Package 14-CDIP
Current - Quiescent (Max) 2.5mA
Current - Input Bias (Max) 0.1uA @ 5V
Voltage - Input Offset (Max) 5mV @ 30V
Voltage - Supply, Single/Dual (+/-) 2V ~ 36V, +/-1V ~ 18V

Getting Started

When designing with the LM139J/PB, ensure a pull-up resistor is selected for the open-collector output based on the desired logic level and the 16mA output current capability. For prototyping, the 14-pin CDIP package is compatible with standard 0.300-inch wide DIP sockets or breadboards. Decouple the VCC pin with a 0.1uF ceramic capacitor close to the device to prevent oscillations during high-speed transitions.

Also Consider

LP339N TITexas Instruments - A low-power version of the quad comparator family for battery-constrained designs needing significantly lower supply current.

Categories

Analog ICs > Comparators Analog ICs Aerospace & Defense > Mil-Spec Components