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LM393AP

Dual voltage comparator, open-collector, 2-36V, 1mV offset, 8-PDIP

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Manufacturer Part：

LM393AP

Package：

8-PDIP

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Description

Product Overview

The LM393AP from Texas Instruments is a dual general-purpose voltage comparator with improved specifications over the standard LM393. Operating from single 2-36V or dual +/-1-18V supply, it features open-collector outputs for flexible logic interfacing. Packaged in 8-PDIP.

Key Specifications

Channels 2 (independent)
Supply Voltage 2V to 36V (single) or +/-1V to +/-18V
Input Offset Voltage 1mV (typ, improved grade)
Response Time 1.3us (typ, small signal)
Output Type Open-collector
Output Sink Current 16mA (max)
Input Bias Current 25nA (typ)
Package 8-PDIP
Operating Temperature -40 to +85 C

Features

  • Dual independent comparators
  • Open-collector outputs for wired-OR
  • 1mV typical input offset (A grade)
  • 2-36V wide supply range
  • Input common-mode includes ground
  • Pin-compatible with LM393, LM2903, LM193

Applications

  • Voltage threshold detection
  • Window comparators
  • Zero-crossing detectors
  • Oscillator and timing circuits

The LM393AP from Texas Instruments is the improved-grade dual voltage comparator, featuring 1mV typical input offset voltage compared to 2mV for the standard LM393. Two independent comparators with open-collector outputs can sink up to 16mA each, allowing direct connection to logic gates, LEDs, or relay drivers through pull-up resistors. The open-collector outputs support wired-OR connections where multiple comparator outputs share a single pull-up resistor. Operating from 2V to 36V single supply (or +/-1V to +/-18V dual supply), the LM393AP covers virtually all common supply voltages. The input common-mode range includes ground, enabling single-supply operation with ground-referenced signals. The 1.3us response time supports applications up to several hundred kHz. The LM393AP is pin-compatible with the LM393, LM2903 (automotive), and LM193 (military) versions.

The LM393AP comparator continuously compares the voltage at its non-inverting input (+) to the voltage at its inverting input (-). When V+ > V-, the output transistor turns off and the open-collector output floats HIGH (via external pull-up resistor). When V+ < V-, the output transistor turns on and pulls the output LOW. Unlike op-amps, comparators have no internal compensation capacitor, providing much faster response (1.3us vs microseconds for op-amps). However, the lack of compensation means the LM393 cannot be used with negative feedback (it would oscillate). Positive feedback (hysteresis) can be added with a resistor from output to non-inverting input to prevent oscillation near the switching threshold. The open-collector output requires an external pull-up resistor to a voltage that can be different from the comparator supply, enabling level translation.

Pin Name Function
1 1OUT Comparator 1 output (open-collector)
2 1IN- Comparator 1 inverting input
3 1IN+ Comparator 1 non-inverting input
4 GND Ground / negative supply
5 2IN+ Comparator 2 non-inverting input
6 2IN- Comparator 2 inverting input
7 2OUT Comparator 2 output (open-collector)
8 VCC Positive supply (2-36V)
  • Voltage threshold detection with 1mV precision and open-collector logic output
  • Window comparator using two channels for over/undervoltage monitoring
  • Zero-crossing detector for AC signal synchronization
  • Relaxation oscillator using open-collector with positive feedback hysteresis
Model Manufacturer Key Difference
LM393N TI Standard grade, 2mV offset, lower cost
LM2903N TI Automotive grade, -40 to 125C
LM339N TI Quad comparator, 4 channels, 14-pin
TLC3702CP TI CMOS push-pull output, no pull-up needed
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