LM393DR2G is a dual-channel precision voltage comparator chip produced by ON Semiconductor. The chip features two independent comparators, capable of single or split supply operation, and features low offset voltage.

LM393DR2G is a dual-channel low-power comparator, which is a type of integrated circuit. The main function of LM393DR2G is to compare input signals and output corresponding logic levels for logic control or judgment in electronic systems. It has a wide range of applications in voltage comparison, switch control, voltage monitoring, etc. LM393DR2G is widely used in various electronic devices and systems.

Ⅰ.Specification parameters of LM393DR2G

•Number of components:2
•Number of circuits:2
•Number of channels:2
•Number of pins:8
•Width:4 mm
•Height:1.5 mm
•Reference voltage:Yes
•Technology:Bipolar
•Response time:1.5 us
•Package/Case:SOIC-8
•Product Category:Analog Comparator
•Installation style:SMD/SMT
•Number of channels:2 Channel
•Supply voltage-minimum:2 V
•Supply voltage-maximum:36 V
•Operating power supply current:1 mA
•Minimum operating temperature: 0℃
•Maximum operating temperature:+70℃
•Ib-input bias current:250 nA
•Vos-input bias voltage:5 mV
•Output current per channel:16 mA
•Output type:Open Collector
•Comparator type:General Purpose
•Shutdown:No Shutdown
•Subcategory:Amplifier ICs
•Power supply type:Single, Dual
•Minimum dual supply voltage:1 V
•Maximum dual supply voltage:+/- 18 V
•Pd-Power dissipation:570 mW
•Product:Analog Comparators
•Output type:open set, rail-to-rail
•Voltage gain dB:106.02 dB
•Type:Low Offset Comparator
•Current-Quiescent (maximum):2.5mA
•Current-Output (Typical):16mA @ 5V
•Voltage-input compensation (max):5mV @ 30V
•Voltage-power supply, single/dual (±):2V ~ 36V, ±1V ~ 18V
•Operating power supply voltage:3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V
•Dual supply voltage:+/- 3 V, +/- 5 V, +/- 9 V, +/- 12 V, +/- 15 V

Ⅱ.Features of LM393DR2G

•Low Input Bias Current: 25 nA

•Low Input Offset Current: 5.0 nA

•Split−Supply Range: ±1.0 Vdc to ±18 Vdc

•Wide Single-Supply Range: 2.0 Vdc to 36 Vdc

•Low Input Offset Voltage: 5.0 mV (max) LM293/393

•Very Low Current Drain Independent of Supply Voltage: 0.4 mA

•Input Common Mode Range to Ground Level

•Differential Input Voltage Range Equal to Power Supply Voltage

•These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

•ESD Clamps on the Inputs Increase the Ruggedness of the Device without Affecting Performance

•Output Voltage Compatible with DTL, ECL, TTL, MOS, and CMOS Logic Levels

•NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable

Ⅲ.Working principle of LM393DR2G

LM393DR2G is a dual-channel precision voltage comparator. Its working principle is based on comparing the magnitude of two input voltages and outputting corresponding level signals based on the comparison results. It has two independent comparators, each with two inputs and one output.

When the voltage at the positive input terminal is higher than the voltage at the negative input terminal, the output terminal of the comparator will output a high level (usually the power supply voltage or a level close to the power supply voltage); when the voltage at the positive input terminal is lower than the voltage at the negative input terminal, The output of the comparator outputs a low level (usually zero level or a level close to zero level). This comparison operation is real-time and can respond quickly when the input voltage changes.

The comparison operation of LM393DR2G is based on the working principle of its internal differential amplifier. A differential amplifier is an amplifier that amplifies the difference between two input signals. It generates an output signal by comparing the magnitude of the two input signals. In the LM393DR2G, a differential amplifier is used to compare the voltages at the positive input terminal and the negative input terminal and generate the corresponding output signal.

In addition, LM393DR2G also has some special designs, such as low offset voltage and low input bias current, to improve its comparison accuracy and stability. These characteristics make LM393DR2G widely used in application scenarios that require high-precision comparison, such as power management, voltage monitoring, current detection, voltage reference, etc.

Ⅳ.Maximum Ratings of LM393DR2G

Ⅴ.Electrical Characteristics of LM393DR2G (VCC = 5.0 Vdc, Tlow ≤ TA ≤ Thigh, unless otherwise noted.)

Ⅵ.Application fields of LM393DR2G

1.Signal processing: In analog signal processing circuits, LM393DR2G can be used for signal comparison, level conversion and other functions, helping to achieve various signal processing tasks.

•Signal comparison:
(1). Comparator circuit: LM393DR2G can be used as a comparator to compare the relative sizes of two analog signals and output a logic level to indicate which signal is larger or smaller.
(2) Threshold detection: LM393DR2G can be used to detect whether the input signal exceeds or falls below a set threshold. This is useful for detecting specific events or changes in a signal, such as detecting the start or end of a pulse signal.

•Noise suppression and signal shaping:
(1). Signal filtering: Through comparator configuration, the noise in the input signal can be filtered out and useful signal features can be extracted.
(2). Waveform shaping: Comparators can be used to convert analog signals into simpler waveforms, such as converting sine waves into square waves or pulse signals.

•Level conversion:
(1) Analog level detection: This comparator can be used to detect whether the level of the analog signal is within a specific range, and generate a corresponding digital output signal accordingly. This is useful for signal preprocessing before the analog-to-digital converter (ADC).
(2). Interface between digital signals and analog signals: LM393DR2G can compare or convert digital logic signals (such as output from a microcontroller) with analog signals to achieve the interface between digital and analog systems.

•Control applications: In analog control systems, comparators can be used in feedback loops to compare actual output with desired output to adjust system parameters to achieve more precise control.

•Signal demodulation:
(1). Amplitude demodulation: The comparator can also be used for amplitude demodulation to restore the amplitude modulated signal to the original information.
(2). Frequency demodulation: In communication systems, LM393DR2G can be used for frequency demodulation to convert frequency modulated signals into changes in voltage or current.

2.Sensor interface: Since LM393DR2G has a dual-channel comparator, it is suitable for interfacing with many types of sensors, such as photoelectric sensors, temperature sensors, pressure sensors, etc.

•Photoelectric sensor: Use a photoelectric sensor to detect light intensity and convert it into a voltage signal. The LM393DR2G can compare this voltage signal to a reference voltage to determine whether the light intensity exceeds or falls below a certain threshold.

•Temperature Sensor: A temperature sensor (such as a thermistor or thermocouple) produces an analog signal related to temperature. The LM393DR2G can compare this signal to a preset threshold to determine if the temperature is outside a safe range. In applications where the temperature at two different points needs to be compared, the LM393DR2G can receive signals from two temperature sensors simultaneously and output which temperature is higher or lower.

•Pressure sensor: The pressure sensor outputs an analog signal indicating the size of the pressure. LM393DR2G can be used to detect whether this signal is within a preset safe range.

•Other sensors: The LM393DR2G can be used to process signals from position sensors, such as potentiometers or Hall effect sensors, for detecting the position or angle of an object.

3.Power management: In the power management system, LM393DR2G can be used for battery voltage monitoring, overvoltage protection, undervoltage protection and other functions. By comparing the battery voltage with a preset threshold, the battery charging and discharging process can be controlled to protect the battery from overvoltage or undervoltage damage.

•Battery voltage monitoring: LM393DR2G can be used to continuously monitor battery voltage. By comparing the battery voltage to a preset reference voltage, the current voltage level of the battery can be determined. This is useful for understanding battery status, predicting remaining usage time, and preventing battery over-discharge.

•Charge and discharge control: By comparing the battery voltage with a preset threshold, the LM393DR2G can also be used to control the battery's charge and discharge process. For example, when charging, an upper limit voltage can be set. When the battery voltage reaches this value, the comparator outputs a signal to shut down the charger. Similarly, during the discharge process, a lower limit voltage can be set. When the battery voltage drops to this value, the system can take measures to protect the battery.

•Under-voltage protection: Similarly, when the battery voltage is too low, it may cause the battery to fail to work properly, or even cause irreversible damage. The LM393DR2G monitors battery voltage and signals when the voltage drops below a safe threshold. This allows the system to take appropriate actions, such as shutting down unnecessary loads, switching to backup power, or alerting the user to charge, thereby preventing battery over-discharge.

•Overvoltage protection: When the battery voltage is too high, it may cause damage to the battery itself or the circuit to which it is connected. The LM393DR2G can be used to detect this situation and initiate overvoltage protection measures through the comparator output signal. This may include turning off the power supply, cutting off the charging path, or reducing the load current to protect the battery and associated circuitry from excessive voltage damage.

•System integration and flexibility: The dual-channel feature of the LM393DR2G allows it to monitor the voltage of two batteries or different points simultaneously on the same chip, thus simplifying the design of power management systems. In addition, due to its high accuracy and fast response characteristics, it is ideally suited for power management applications that require fast response and precise control.

•Charge and discharge control: By comparing the battery voltage with a preset threshold, the LM393DR2G can also be used to control the battery's charge and discharge process. For example, when charging, you can set an upper limit voltage. When the battery voltage reaches this value, the comparator outputs a signal to shut down the charger. Similarly, during the discharge process, a lower limit voltage can be set. When the battery voltage drops to this value, the system can take measures to protect the battery.

4.Switch control: Because LM393DR2G can compare the input signal with the reference voltage and output the corresponding logic level, it is often used in switch control circuits. For example, it can be used as a comparison element for a switch to turn the switch on or off when the input signal reaches or exceeds a certain threshold.

•Temperature control switch: In temperature control systems, LM393DR2G can be used to monitor the output of the temperature sensor.

•Threshold detection switch: When the input signal (such as the signal from the sensor) reaches or exceeds the preset threshold, the output state of the LM393DR2G will change (such as from low level to high level).

•Photosensitive switch: In light control systems, such as fluorescent lamp control systems, LM393DR2G can be used to detect ambient light intensity.

•Liquid level control switch: In liquid level control systems, such as water tanks or pools, the LM393DR2G can be used to detect the output of the liquid level sensor.

5.Industrial electronic products: In industrial automation, measurement and control systems, LM393DR2G can be used for processing and comparison of various sensor signals. These systems often require high accuracy and fast response, and the LM393DR2G meets these needs.

•Sensor signal processing: In industrial environments, sensors are devices used to monitor various physical quantities (such as temperature, pressure, light, position, etc.). These sensors typically produce analog signals that need to be converted into digital signals or logic levels for further processing and control. The comparator function of LM393DR2G allows it to compare the analog signal generated by the sensor with the reference voltage and output the corresponding logic level.

•Various industrial automation applications: LM393DR2G is widely used in industrial automation. For example, in a PLC (Programmable Logic Controller), it can be used to detect the status of input signals and control the output according to a preset logic program. In motor control systems, it can be used to monitor the operating status of the motor and adjust the speed or direction of the motor as needed. In addition, LM393DR2G also plays an important role in quality inspection and safety monitoring on the production line.

•High accuracy and fast response: In industrial applications, accuracy and response speed are very important. The LM393DR2G stands out for its high accuracy and fast response characteristics. It can accurately compare sensor signals with reference voltages and quickly output results, ensuring that the system can make real-time and accurate decisions.

•Measurement and control system: In the measurement and control system, LM393DR2G also plays a key role. It can be used to compare the actual measured value with the set value, and adjust the control parameters of the system based on the comparison results. This comparison and adjustment process is critical to ensuring stable system operation, improving productivity, and preventing potential safety risks.

6.Current detection: By combining appropriate resistors, LM393DR2G can be used to detect the current value in the circuit. This detection function is very useful in overcurrent protection, load monitoring and other scenarios, and can help prevent circuit damage or equipment overheating.

•Overcurrent protection: Overcurrent protection is a very important safety mechanism in electronic equipment. When the current in the circuit exceeds the rating of the equipment, it may cause equipment damage, overheating, or even fire and other dangerous situations. LM393DR2G can monitor the current in the circuit in real time. Once it detects that the current exceeds the preset safety threshold, it will respond quickly to cut off or adjust the circuit to prevent equipment damage.

•With appropriate resistors: In order to achieve the current detection function, it is usually necessary to use LM393DR2G with appropriate resistors. Resistor selection depends on the required current sensing range and accuracy. By properly selecting and configuring resistors, accurate measurement and monitoring of current in a circuit can be achieved.

•Load monitoring: Load monitoring refers to the real-time detection and analysis of the load status in the circuit. This helps you understand the operating status of your equipment, predict potential problems, and make adjustments accordingly. The LM393DR2G can accurately detect the current value in the circuit, thereby providing real-time feedback on the load status. This is very helpful in ensuring stable operation of the equipment, optimizing performance and preventing potential problems.

7.Automotive electronic products: In the automotive field, LM393DR2G can be used in battery management systems, body control systems, etc. By monitoring and comparing voltage and current values at critical circuit nodes, the normal operation and safety of automotive systems can be ensured.

•Battery management system: The battery management system is one of the core components of modern electric and hybrid vehicles. It is responsible for monitoring the status of the battery, including voltage, current, temperature and other key parameters to ensure the safe and efficient operation of the battery. The LM393DR2G accurately monitors voltage and current values in battery circuits and compares them with preset safety thresholds. Once an abnormal situation is detected, such as battery overcharge, over-discharge, excessive temperature or excessive current, it will respond quickly to cut off the circuit or sound an alarm, thereby preventing battery damage or potential safety risks.

•System integration and reliability: In automotive electronics, system integration and reliability are crucial. The LM393DR2G's compact package and easy integration make it easy to integrate into automotive system designs. At the same time, its high reliability and stability ensure that LM393DR2G can maintain excellent performance in harsh automotive operating environments, providing a solid guarantee for the normal operation of automotive systems.

•Body control system: The body control system is responsible for managing and coordinating various electrical systems and functions inside the car, such as lighting, air conditioning, door locks, etc. LM393DR2G plays an important role in body control systems. It can monitor the voltage and current values of key circuit nodes to ensure the normal operation of each electrical system. At the same time, it can also compare input signals from different sensors and switches to control the status and behavior of various vehicle body components. This precise monitoring and comparison capability allows the body control system to respond to the driver's instructions and changes in the external environment in real time, providing a comfortable and safe driving experience.

8.Voltage monitoring: LM393DR2G can be used to monitor the voltage values of key points in the circuit to ensure normal operation of the circuit. For example, in a microprocessor or digital logic circuit, the power supply voltage or the voltage of internal key nodes can be monitored to ensure the stability and reliability of the circuit.

•Power supply voltage monitoring: In microprocessors or digital logic circuits, the stability of the power supply voltage is crucial. Fluctuations in the power supply voltage can cause device performance degradation, logic errors, or even device damage. The LM393DR2G can be used to monitor the supply voltage to ensure it is within the specified range. By comparing with the preset threshold, once it detects that the power supply voltage exceeds the safe range, the LM393DR2G can respond quickly to issue an alarm or trigger the corresponding protection mechanism to ensure the stable operation of the device.

•Internal key node voltage monitoring: In addition to the power supply voltage, LM393DR2G can also be used to monitor key node voltages inside the circuit. In complex circuits, the voltage values of certain key nodes are critical to the normal operation of the circuit. By monitoring the voltage of these nodes in real time, abnormal conditions can be discovered and dealt with in time to prevent circuit failures. The high precision and fast response characteristics of LM393DR2G enable it to accurately capture voltage changes, ensuring the stability and reliability of the circuit.

9.Consumer electronics: Due to its low power consumption and high precision, LM393DR2G is very suitable for use in consumer electronics, such as mobile phones, tablets, TVs, etc. Among these products, LM393DR2G can be used for battery management, charging control, power monitoring and other functions.

•Mobile phones and tablets: In mobile devices such as mobile phones and tablets, battery life and charging speed are key factors. LM393DR2G can be used in battery management systems to accurately monitor battery status, including voltage, current and temperature, to ensure that the battery works safely and efficiently. In addition, it can be used for charging control to accurately detect voltage and current changes during charging, thereby preventing overcharging and battery damage.

•Integration and compatibility: The design and production of consumer electronics products require components with high integration and good compatibility. The LM393DR2G's compact package and ease of integration make it an ideal choice for these products. In addition, its wide input voltage range and flexible output configuration enable it to easily adapt to different application scenarios and circuit requirements.

•TVs and other home appliances: In household electronics such as TVs, audio systems, and air conditioners, power monitoring and management are equally important. LM393DR2G can be used to monitor the voltage and current of the main power supply and internal key circuits to ensure that the equipment is operating within the normal operating range. In addition, it can help achieve energy conservation and environmental protection goals by precisely controlling power usage and reducing unnecessary power consumption.

10.Voltage reference: LM393DR2G can also be used as a voltage reference, forming an accurate voltage reference together with other circuit components. This is very important for applications that require high-precision voltage control, such as analog circuits, ADCs (analog-to-digital converters), and DACs (digital-to-analog converters).

•Analog circuits: In analog circuits, voltage stability is crucial to ensure circuit performance. LM393DR2G can be used as a voltage reference to provide an accurate and stable voltage reference for the circuit. This allows other components in the circuit to operate relative to this reference, thereby improving the performance and reliability of the overall circuit.

•ADC and DAC: Analog-to-digital converters (ADC) and digital-to-analog converters (DAC) are key components for conversion between digital and analog signals. To ensure conversion accuracy, a high-precision voltage reference is required. The voltage reference function of LM393DR2G can provide an accurate voltage reference for ADC and DAC, thus improving the accuracy and stability of conversion.

Ⅶ.Special functions of LM393DR2G

1.Low input bias current: LM393DR2G has a lower input bias current, allowing it to provide more accurate comparison results under high impedance input conditions and reduce the impact on external circuits.

2.Low power consumption design: LM393DR2G adopts a low power consumption design, which consumes less power when working, which helps to extend battery life and reduce system power consumption. It is suitable for applications that require long-term operation or have higher power consumption requirements. High application.

3.Open-drain output: The output of LM393DR2G has an open-drain structure and can directly drive external loads, such as transistors, relays, etc., allowing it to be directly connected to various types of external devices to facilitate system integration and control.

4.Wide temperature range: LM393DR2G is generally able to operate normally within a wide operating temperature range, including industrial-grade temperature ranges, and is suitable for applications under various environmental conditions.

5.Wide voltage operating range: LM393DR2G has a wide range of power supply operating voltage. It can usually work in single power supply or dual power supply mode, and can adapt to different power supply environments, providing greater design flexibility.

6.Dual-channel comparator: LM393DR2G integrates two independent comparator channels, allowing it to process two different input signals at the same time, or perform different comparison tasks, improving the flexibility and functionality of the system.

Ⅷ.Alternate model of LM393DR2G

•LM393D
•KIA393F
•LM393DRE4
•LM393DR
•LM393DG4
•LM393M/NOPB

Frequently Asked Questions

1.How does LM393DR2G operate in different temperature environments?
LM393DR2G typically operates over a wide temperature range, making it suitable for industrial and automotive applications.

2.What is the purpose of LM393DR2G in a voltage monitoring circuit?
LM393DR2G can be used to compare a reference voltage with the monitored voltage and generate an output signal based on the comparison result, indicating whether the voltage exceeds a predefined threshold.

3.How does LM393DR2G handle input signals with different voltage levels?
LM393DR2G compares the input signals with a reference voltage and produces a logic-level output based on the comparison results, regardless of the input signal levels.