Linear - Comparators

Image Part Number Description / PDF Quantity Rfq
NJM2901CAV-TE1

NJM2901CAV-TE1

New Japan Radio (NJR)

SINGLE-SUPPLY QUAD COMPARATOR

0

NJU77240F-TE1

NJU77240F-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT OPEN-DRAIN OU

0

NJU77242RB1-TE1

NJU77242RB1-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT OPEN-DRAIN OU

0

NJU77241F-TE1

NJU77241F-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT OPEN-DRAIN OU

0

NJU77230F-TE1

NJU77230F-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT PUSH-PULL OUT

0

NJM2903CM-TE2

NJM2903CM-TE2

New Japan Radio (NJR)

SINGLE-SUPPLY DUAL COMPARATOR

0

NJU77232RB1-TE1

NJU77232RB1-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT PUSH-PULL OUT

0

NJM2406F-TE1

NJM2406F-TE1

New Japan Radio (NJR)

IC COMP SNGL SUPPLY SOT23-5 MTP5

994

NJU77241F3-TE1

NJU77241F3-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT OPEN-DRAIN OU

3419

NJM8191F-TE1

NJM8191F-TE1

New Japan Radio (NJR)

SINGLE CHANNEL LOW POWER COMPARA

2878

NJM339CV-TE1

NJM339CV-TE1

New Japan Radio (NJR)

LOW POWER QUAD VOLTAGE COMPARATO

0

NJM2903CG-TE2

NJM2903CG-TE2

New Japan Radio (NJR)

SINGLE-SUPPLY DUAL COMPARATOR

5091

NJU7108F3-TE1

NJU7108F3-TE1

New Japan Radio (NJR)

LOW POWER AND LOW OFFSET VOLTAGE

0

NJM339CG-TE2

NJM339CG-TE2

New Japan Radio (NJR)

LOW POWER QUAD VOLTAGE COMPARATO

1260

NJM393CV-TE1

NJM393CV-TE1

New Japan Radio (NJR)

LOW POWER DUAL VOLTAGE COMPARATO

0

NJU77240F3-TE1

NJU77240F3-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT OPEN-DRAIN OU

0

NJM2903CAV-TE1

NJM2903CAV-TE1

New Japan Radio (NJR)

SINGLE-SUPPLY DUAL COMPARATOR

0

NJM390AF3-TE1

NJM390AF3-TE1

New Japan Radio (NJR)

LOW POWER SINGLE VOLTAGE COMPARA

0

NJU77230F3-TE1

NJU77230F3-TE1

New Japan Radio (NJR)

RAIL-TO-RAIL INPUT PUSH-PULL OUT

0

NJM12903V-TE1

NJM12903V-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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