Linear - Comparators

Image Part Number Description / PDF Quantity Rfq
NJM12901D1

NJM12901D1

New Japan Radio (NJR)

IC COMP QUAD SNGL-SUPPLY 14-DIP

0

NJM2407R-TE1

NJM2407R-TE1

New Japan Radio (NJR)

IC COMPARATOR DUAL 8-VSP

0

NJM12901M

NJM12901M

New Japan Radio (NJR)

IC COMP QUAD SNGL-SUPPLY 14-DMP

1408

NJM12903R-TE1

NJM12903R-TE1

New Japan Radio (NJR)

SINGLE SUPPLY DUAL COMPARATOR

0

NJU77231F-TE1

NJU77231F-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT PUSH-PULL OUT

3895

NJM2901CG-TE2

NJM2901CG-TE2

New Japan Radio (NJR)

SINGLE-SUPPLY QUAD COMPARATOR

2481

NJM12903D

NJM12903D

New Japan Radio (NJR)

IC COMP DUAL SNGL-SUPPLY 8-DIP

0

NJM12901M#

NJM12901M#

New Japan Radio (NJR)

IC COMP QUAD SNGL-SUPPLY 14-DMP

0

NJM2903CRB1-TE1

NJM2903CRB1-TE1

New Japan Radio (NJR)

SINGLE-SUPPLY DUAL COMPARATOR

0

NJM393CG-TE2

NJM393CG-TE2

New Japan Radio (NJR)

LOW POWER DUAL VOLTAGE COMPARATO

1853

NJM390AF-TE1

NJM390AF-TE1

New Japan Radio (NJR)

LOW POWER SINGLE VOLTAGE COMPARA

0

NJM2903D

NJM2903D

New Japan Radio (NJR)

IC COMP DUAL SINGLE/SUPPLY 8DIP

1727

NJM2901CV-TE1

NJM2901CV-TE1

New Japan Radio (NJR)

SINGLE-SUPPLY QUAD COMPARATOR

0

NJM12901V-TE1

NJM12901V-TE1

New Japan Radio (NJR)

SINGLE SUPPLY QUAD COMPARATOR

0

NJM391AF-TE1

NJM391AF-TE1

New Japan Radio (NJR)

LOW POWER SINGLE VOLTAGE COMPARA

2211

NJM391AF3-TE1

NJM391AF3-TE1

New Japan Radio (NJR)

LOW POWER SINGLE VOLTAGE COMPARA

0

NJM12903M

NJM12903M

New Japan Radio (NJR)

IC COMP DUAL SNGL-SUPPLY 8-DMP

0

NJU7116F-TE1

NJU7116F-TE1

New Japan Radio (NJR)

SUPER LOW OPERATING CURRENT AND

0

NJU7141F-TE1

NJU7141F-TE1

New Japan Radio (NJR)

LOW-VOLTAGE OPERATION TINY SINGL

0

NJM12903RB1-TE1

NJM12903RB1-TE1

New Japan Radio (NJR)

SINGLE SUPPLY DUAL COMPARATOR

0

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

TypeFunctional FeaturesApplication Examples
General-Purpose ComparatorsBasic voltage comparison with moderate speed and accuracySimple threshold detection in appliances
Precision ComparatorsLow offset voltage and high accuracyInstrumentation and measurement equipment
High-Speed ComparatorsSub-nanosecond response timesRF signal processing and oscilloscopes
Low-Power ComparatorsUltra-low quiescent currentBattery-powered IoT devices
Window ComparatorsDetect if input voltage falls within a defined rangePower 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

ParameterDescriptionImportance
Input Offset VoltageMaximum voltage difference required to switch outputDetermines comparison accuracy
Propagation DelayTime between input change and output responseCritical for high-speed applications
Supply Voltage RangeOperating voltage range (e.g., 2.7V-36V)Dictates system power design
Power ConsumptionQuiescent current under active/idle conditionsBattery life optimization
HysteresisVoltage margin to prevent oscillation near thresholdsImproves 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

ManufacturerRepresentative ProductKey Features
TI (Texas Instruments)LM393Dual comparator, 2.0V-36V supply, 1.3 A quiescent current
STMicroelectronicsTLV32011.8V supply, 40ns propagation delay
Analog DevicesAD8561Single-supply, 7ns response time
ON SemiconductorNCS2250Zero-drift architecture, 10 V offset

7. Selection Guidelines

  1. Speed Requirements: Match propagation delay to system clock rates
  2. Accuracy Needs: Select offset voltage <1mV for precision sensing
  3. Power Constraints: Choose nano-power variants for portable devices
  4. Environmental Factors: Consider temperature-rated parts (-40 C to +125 C)
  5. 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
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