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LM393DR

Dual comparator, open-collector, 2-36V, 1.3µs, SOIC-8

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Manufacturer Part：

LM393DR

Package：

SOIC-8 (4.9 x 3.91 x 1.58mm, 1.27mm pitch)

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Integrated Circuits ICs

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Description

Product Overview

The LM393DR is a dual differential comparator from Texas Instruments with open-collector outputs, low offset voltage, and single/dual supply operation in an SOIC-8 package.

Key Specifications

Number of Comparators	2 (dual)
Supply Voltage Range	2V to 36V (single) or ±1V to ±18V (dual)
Input Offset Voltage	1mV typical, 5mV max
Input Bias Current	25nA typical
Input Common-Mode Range	0V to VCC-1.5V
Output Type	Open-collector (requires pull-up resistor)
Output Sink Current	16mA typical
Response Time	1.3µs typical (5mV overdrive)
Supply Current	0.4mA typical (both comparators)
Operating Temperature	0°C to +70°C
Package	SOIC-8 (4.9 x 3.91mm)

Features

Dual independent comparators in single 8-pin package
Open-collector outputs for wire-OR and level shifting
Wide supply range: 2V to 36V single supply
Low input offset voltage: 1mV typical
Input common-mode range includes ground
1.3µs response time at 5mV overdrive
Low 0.4mA total supply current
Output compatible with TTL, MOS, and CMOS

Applications

Voltage threshold detection
Zero-crossing detection
Window comparators
Oscillator and timing circuits
Level shifting and interface

Product Introduction:LM393DR Product Introduction

The LM393DR from Texas Instruments contains two independent voltage comparators in an 8-pin SOIC package. Each comparator compares the voltage at its non-inverting input (+) against the voltage at its inverting input (-) and drives an open-collector output LOW when the + input is below the – input, and HIGH (floating/open) when the + input exceeds the – input. The open-collector output requires an external pull-up resistor and can be wire-ORed with other LM393 outputs or connected to a different voltage rail for level shifting. The device operates from a single 2V to 36V supply or dual ±1V to ±18V supplies, with only 0.4mA total quiescent current. The input common-mode range extends from ground to VCC-1.5V, allowing ground-referenced sensing. The 1.3µs response time at 5mV overdrive is suitable for moderate-speed applications. The DR suffix denotes the SOIC-8 package with tape-and-reel packaging.

Working Principle:LM393DR Working Principle

Each of the two comparators in the LM393DR continuously monitors the voltage difference between its non-inverting (+) and inverting (-) inputs. When V+ > V-, the output transistor is OFF and the open-collector output floats (pulled HIGH by the external pull-up resistor). When V+ < V-, the output transistor turns ON and sinks current to ground, pulling the output LOW. The open-collector configuration provides several advantages: (1) multiple outputs can be wire-ORed by connecting them together with a single pull-up resistor, creating a logical AND function (any comparator pulling LOW pulls the entire line LOW); (2) the pull-up voltage can be different from the comparator supply voltage, enabling level shifting from a 5V comparator output to a 3.3V or 12V logic input; (3) the output can directly drive relay coils or LEDs with the pull-up connected to the load supply. The 1mV typical input offset voltage means the switching threshold is accurate to within 1mV of the actual comparison point. The 1.3µs response time at 5mV overdrive indicates the time from the input crossing the threshold to the output reaching 50% of its final value.

Pin Description:LM393DR Pin Definition and Functions

Pin	Name	Type	Description
1	1OUT	Output	Comparator 1 output (open-collector)
2	1IN-	Input	Comparator 1 inverting input
3	1IN+	Input	Comparator 1 non-inverting input
4	GND	Power	Ground / negative supply
5	2IN+	Input	Comparator 2 non-inverting input
6	2IN-	Input	Comparator 2 inverting input
7	2OUT	Output	Comparator 2 output (open-collector)
8	VCC	Power	Positive supply (2V to 36V)

LM393DR uses the SOIC-8 (D) surface-mount package with standard dual comparator pinout: Pin 1 = Output A (open-collector), Pin 2 = Inverting Input A (-), Pin 3 = Non-inverting Input A (+), Pin 4 = GND, Pin 5 = Non-inverting Input B (+), Pin 6 = Inverting Input B (-), Pin 7 = Output B (open-collector), Pin 8 = VCC. The DR suffix denotes SOIC-8 tape-and-reel from TI. Open-collector outputs require external pull-up resistors. The SOIC-8 pinout is identical to the PDIP-8 version (LM393N), enabling seamless PCB layout migration between through-hole and surface-mount. Operating voltage range is 2V-36V single supply or ±1V-±18V dual supply.

Application Scenarios:In which products and applications isLM393DR used

Threshold Detect: Compare sensor voltage against a reference; open-collector directly drives MCU interrupt or LED indicator
Window Comparator: Two comparators + 3 resistors create an in-range/out-of-range detector for voltage monitoring
Zero-Cross: Compare AC signal against ground reference for synchronization in TRIAC dimmer circuits
Level Shift: Pull-up to different voltage (e.g., 3.3V) while comparator runs on 12V supply
Wire-OR: Multiple comparators share one pull-up; any threshold violation pulls the line LOW for fault aggregation

Alternative Models:What chips are recommended as replacements for LM393DR

Model	Manufacturer	Key Difference	Package	Specs
LM393AN	TI	Improved version with lower 2mV max offset voltage for precision threshold detection circuits	DIP-8	1.3µs/2-36V
LM2903N	TI	Automotive-grade -40 to +125C version for under-hood and industrial comparator applications	DIP-8	1.3µs/-40-125C
LM339N	TI	Quad comparator version (4 channels) in DIP-14 for multi-channel threshold detection	DIP-14	1.3µs/4-ch
TLV3202AIDR	TI	High-speed 40ns dual comparator with push-pull output for fast signal detection	SOIC-8	40ns/2.7-5.5V
LTC6702IS8	ADI	Micro-power 18-bit configurable comparator with 200nA supply for battery monitoring	SOIC-8	18-bit/200nA

LM393 is the industry-standard dual voltage comparator with open-drain output and 2-36V supply range. The 1.3µs response time suits general-purpose threshold detection. LM393AN offers lower offset voltage. LM339 provides 4 comparators in DIP-14. For high-speed applications, TLV3202 offers 40ns response with push-pull output at 2.7-5.5V supply.