Linear - Comparators

Part Number	Description / PDF	Quantity
LM2901AQT14-13 Zetex Semiconductors (Diodes Inc.)	IC COMP DUAL DIFF 14TSSOP	10000
AS339GTR-G1 Zetex Semiconductors (Diodes Inc.)	IC COMP LOW PWR/OFFSET V 14TSSOP	0
AZV3002S-13 Zetex Semiconductors (Diodes Inc.)	IC COMP PUSH PULL 8SO	0
LM2901QS14-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR QUAD DIFF SO-14	15000
AZV393GTR-G1 Zetex Semiconductors (Diodes Inc.)	IC OP AMP GP DUAL 8-TSSOP	0
LM2903QS-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR DUAL DIFF SO-8	291927500
AS393GTR-G1 Zetex Semiconductors (Diodes Inc.)	IC COMP LOW PWR/OFFSET V 8TSSOP	0
APX339TSG-13 Zetex Semiconductors (Diodes Inc.)	IC OP AMP R-R QUAD 14-TSSOP	0
LM2903QM8-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR DUAL DIFF MSOP-8	17500
LM2901AS14-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR QUAD SO-14	5000
LM2903TH-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR DUAL DIFF 8TSSOP	1729
AZV393MTR-G1 Zetex Semiconductors (Diodes Inc.)	IC COMP OPEN COLLECTOR 8SOIC	3892
LM2901S14-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR QUAD SO-14	12500
LMV393S-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR TINY LV 8-SO	12500
AS331KTR-G1 Zetex Semiconductors (Diodes Inc.)	IC COMP LOW PWR/OFFSET V SOT23-5	0
LM2903AQTH-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR DUAL DIFF TSSOP-8	5000
AP393AM8G-13 Zetex Semiconductors (Diodes Inc.)	IC COMP DUAL LOW POWER 8-MSOP	52500
LM2903QTH-13 Zetex Semiconductors (Diodes Inc.)	IC COMPARATOR DUAL DIFF TSSOP-8	125000
AZV393MMTR-E1 Zetex Semiconductors (Diodes Inc.)	IC OP AMP GP DUAL 8-MSOP	0
AS339MTR-G1 Zetex Semiconductors (Diodes Inc.)	IC COMP LOW PWR/OFFSET V 14SOIC	316000

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