Linear - Comparators

Part Number	Description / PDF	Quantity
LM2903AVQPWRG4Q1 Texas Instruments	IC COMPARATOR DIFF DUAL 8TSSOP	662
LP311DR Texas Instruments	IC LP STRB DIFF COMPARATR 8-SOIC	7457
LMC7221AIM5/NOPB Texas Instruments	IC COMP TINY CMOS R-R IN SOT23-5	22317
LMC6772QMMX/NOPB Texas Instruments	IC COMP DUAL MICRPWR CMOS 8VSSOP	997
LM339PWRG4 Texas Instruments	IC QUAD DIFF COMPARATOR 14-TSSOP	633
LM339N Texas Instruments	IC QUAD DIFF COMPARATOR 14-DIP	0
LM393PWR Texas Instruments	IC DUAL DIFF COMPARATOR 8-TSSOP	430
LMC7211AIMX/NOPB Texas Instruments	IC COMPAR TNY CMOS RR IN 8SOIC	642
LMC7211AIM5X/NOPB Texas Instruments	IC COMPAR TNY CMOS RR IN SOT23-5	15192
TLV3691IDCKT Texas Instruments	IC COMPARATOR NANO-POWER SC70-5	846
LM393PWRG4 Texas Instruments	IC DUAL DIFF COMPARATOR 8-TSSOP	0
LM2903VQDRG4Q1 Texas Instruments	IC COMPARATOR DIFF DUAL 8SOIC	98
LM193DRG4 Texas Instruments	IC DUAL DIFF COMPARATOR 8-SOIC	1105
LM393APWRG4 Texas Instruments	IC DUAL DIFF COMPARATOR 8-TSSOP	0
TLC3704MDR Texas Instruments	TLC3704 QUAD, MICROPOWER, PUSH-P	12500
LM311DG4 Texas Instruments	IC DIFF COMPARATOR STROBE 8-SOIC	3049975
LMC7221AIM/NOPB Texas Instruments	IC COMP TINY R-R CMOS 8-SOIC	1709975
LM2901VQDRG4Q1 Texas Instruments	IC COMPARATOR DIFF QUAD 14SOIC	737
LM339PWR Texas Instruments	IC QUAD DIFF COMPARATOR 14-TSSOP	304
LMV7235M7X/NOPB Texas Instruments	IC COMP ULP R-R INPUT SC70-5	3705

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