LM393DT Dual-Channel Low-Power Comparator | 2 V–36 V Wide-Voltage Comparator | SO-8 | STMicroelectronics

LM393DT

A dual-channel low-power voltage comparator operating over a wide single or dual supply voltage range, with typical quiescent current ~450 µA, supply range 2 V–36 V or ±1 V–±18 V, featuring open-collector outputs compatible with TTL/CMOS, making it a robust choice for general-purpose threshold detection, level shifting, and measurement interface designs.

Product Description

Product Overview

The LM393DT is part of STMicroelectronics’ LM393 family of dual comparators, integrating two independent comparators operable from a single or dual-supply rail. The device supports a wide single-supply voltage range of 2 V–36 V or dual supplies of ±1 V to ±18 V, features an input common-mode range including ground, and uses an open-collector output structure compatible with TTL/CMOS logic.

Typical quiescent current is about 0.45 mA (per comparator), input bias current ~20 nA, input offset voltage around 1 mV typ, and response time approximately 1.3 µs (RL=5.1 kΩ, 5 V supply), making it well-suited for level detection, threshold switching and comparator triggering applications. The LM393DT comes in an SO-8 surface-mount package in tape-and-reel format, suitable for automated SMT production.

Key Features

Dual-channel comparator design
Wide supply: 2 V–36 V single or ±1 V–±18 V dual supplies
Input common-mode range includes ground even in single-supply operation
Very low quiescent current: typically ~0.45 mA per comparator
Typical input bias current ~20 nA; input offset voltage ~1 mV
Open-collector output structure, compatible with TTL/CMOS logic
Response time around 1.3 µs (RL=5.1 kΩ, 5 V)
Package: SO-8 (surface-mount)

Product Applications

Analog level detection, threshold switching, and zero-cross detection
Battery monitoring, under-voltage / over-voltage monitoring circuits
Cost-effective reset/monitor circuits and watchdog alternatives
Signal comparison, RS232/TTL level conversion, and general I/O driving
Sensor output comparison and relay driver interfaces in industrial control
General-purpose comparator functions in appliances, measurement instruments, and automotive electronics (where qualified)

Technical Specifications

Parameter	Specification
Number of Comparators	2
Single-Supply Voltage	2 V ~ 36 V
Dual-Supply Voltage	±1 V ~ ±18 V
Supply Current (typ)	0.45 mA (VCC = 5 V, no load, per comparator)
Input Bias Current	≈ 20 nA typ.
Input Offset Voltage	≈ 1 mV typ.
Response Time	≈ 1.3 µs (RL = 5.1 kΩ, VCC = 5 V)
Output Saturation Voltage	80 mV typ. (Isink = 4 mA)
Package	SO-8 (Surface-mount)
Operating Temp Range	0 °C ~ +70 °C (Standard Type)

RFQ & Support

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