Linear - Comparators

Part Number	Description / PDF	Quantity
LM393PT STMicroelectronics	IC VOLT COMPARATOR DUAL 8-TSSOP	8127
TS3704CDT STMicroelectronics	IC COMP QUAD CMOS MCRPWR 14SOIC	15793
LM2903ST STMicroelectronics	ANALOG COMPARATORS STANDARD PROD	7722
TS884IDT STMicroelectronics	IC COMPARATOR R-R 1.1V 14SOIC	0
TS3702CDT STMicroelectronics	IC COMPARATOR DUAL MCRPWR 8-SOIC	4445
TS339IDT STMicroelectronics	IC COMP MICROPWR QUAD V 14 SOIC	3497
LM139ADT STMicroelectronics	IC COMP QUAD LOW PWR SO-14	104
LMV339IPT STMicroelectronics	IC COMP QUAD LOW VOLT 14TSSOP	9308
TS391ILT STMicroelectronics	IC COMP LO PWR SGL V SOT 23-5L	20857
TS372CDT STMicroelectronics	IC COMPARATOR DUAL LO PWR 8-SOIC	127
TS7221BILT STMicroelectronics	IC COMPARATOR UPOWER R-R SOT23-5	0
TS3011IYLT STMicroelectronics	IC COMPARATOR R-R HS SOT23-5	6314
TSX3702IDT STMicroelectronics	IC OP AMP COMP DUAL 16V 8SOIC	4832
TS3011IYQ3T STMicroelectronics	RAIL-TO-RAIL HIGH-SPEED COMPARAT	1009
LM2903YPT STMicroelectronics	IC VOLT COMPARATOR DUAL 8-TSSOP	386
TSX3704IDT STMicroelectronics	IC COMP VOLT CMOS QUAD 14SO	0
LMV393IDT STMicroelectronics	IC COMP QUAD LOW VOLT 8SOIC	0
TS861ILT STMicroelectronics	IC COMPARATOR R-R MCRPWR SOT23-5	0
TS864IDT STMicroelectronics	IC COMPARATOR R-R MCRPWR 14-SOIC	0
TS391RIYLT STMicroelectronics	LOW POWER, SINGLE VOLTAGE COMPAR	966

Linear - Comparators

1. Overview

Linear comparators are analog integrated circuits designed to compare two voltage signals and output a digital signal indicating which voltage is higher. They serve as fundamental components in electronic systems, enabling decision-making processes in applications ranging from voltage level detection to waveform shaping. Their importance spans industries such as industrial automation, consumer electronics, automotive systems, and medical devices, where precise signal comparison is critical.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
General-Purpose Comparators	Basic voltage comparison with moderate speed and accuracy	Simple threshold detection in appliances
Precision Comparators	Low offset voltage and high accuracy	Instrumentation and measurement equipment
High-Speed Comparators	Sub-nanosecond response times	RF signal processing and oscilloscopes
Low-Power Comparators	Ultra-low quiescent current	Battery-powered IoT devices
Window Comparators	Detect if input voltage falls within a defined range	Power supply monitoring systems

3. Structure and Composition

A linear comparator typically consists of:

Differential Amplifier Stage: Amplifies the voltage difference between inputs
Reference Voltage Circuit: Provides stable threshold voltages
Output Stage: Generates rail-to-rail digital output (e.g., CMOS, TTL-compatible)
Protection Circuits: ESD protection and overvoltage tolerance

Common package types include SOIC, SOT-23, and TSSOP. Advanced designs integrate hysteresis circuits or voltage references.

4. Key Technical Specifications

Parameter	Description	Importance
Input Offset Voltage	Maximum voltage difference required to switch output	Determines comparison accuracy
Propagation Delay	Time between input change and output response	Critical for high-speed applications
Supply Voltage Range	Operating voltage range (e.g., 2.7V-36V)	Dictates system power design
Power Consumption	Quiescent current under active/idle conditions	Battery life optimization
Hysteresis	Voltage margin to prevent oscillation near thresholds	Improves noise immunity

5. Application Areas

Industrial: PLC input modules, motor control systems
Consumer: Smartphone battery level indicators
Automotive: Battery management in EVs, sensor signal conditioning
Medical: ECG signal analysis equipment
Telecommunications: Optical receiver signal detection

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TI (Texas Instruments)	LM393	Dual comparator, 2.0V-36V supply, 1.3 A quiescent current
STMicroelectronics	TLV3201	1.8V supply, 40ns propagation delay
Analog Devices	AD8561	Single-supply, 7ns response time
ON Semiconductor	NCS2250	Zero-drift architecture, 10 V offset

7. Selection Guidelines

Speed Requirements: Match propagation delay to system clock rates
Accuracy Needs: Select offset voltage <1mV for precision sensing
Power Constraints: Choose nano-power variants for portable devices
Environmental Factors: Consider temperature-rated parts (-40 C to +125 C)
Integration Level: Opt for devices with built-in references/hysteresis

8. Industry Trends

Miniaturization: WLCSP packages enabling wearable device integration
Energy Efficiency: Sub-1 A quiescent current devices for always-on systems
Higher Integration: Comparators with ADC interfaces and digital calibration
Broadband Operation: GHz-range comparators for 5G infrastructure
Smart Sensing: Embedded AI for adaptive threshold control