What is the Additional Feature ?

Name: LM397MFX
Brand: Texas Instruments
SKU: LM397MFX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Texas Instruments LM397MFX

Part No.:: LM397MFX

Manufacturer:: Texas Instruments

Package:: SC-74A, SOT-753

Datasheet:: LM397MFX.pdf

Description:: IC COMPARATOR VOLT SGL SOT23-5

In Stock:: 3872

Quantity:: Add To Cart

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LM397MFX Specifications

Package/Case:
SC-74A, SOT-753
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
Series:
-
ProductStatus:
Obsolete
Type:
General Purpose
NumberofElements:
1
OutputType:
CMOS, Open-Collector, TTL
Voltage-SupplySingle/Dual(±):
5V ~ 30V, ±2.5V ~ 15V
Voltage-InputOffset(Max):
7mV @ 30V
Current-InputBias(Max):
0.25µA @ 5V
Current-Output(Typ):
13mA @ 5V
Current-Quiescent(Max):
2mA
CMRRPSRR(Typ):
-
PropagationDelay(Max):
940µs
Hysteresis:
-
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Surface Mount

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LM397MFX information

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LM397MFX Typical application Circuitry

LM397MFX

LM397MFX is a single voltage comparator designed for precision voltage comparison applications. It is commonly used in electronic circuits that require a decision-making element based on the comparison of two voltages, such as threshold detection, signal conditioning, and simple analog-to-digital conversion interfaces.

Application Scenarios

A typical application for the LM397MFX is in overvoltage protection circuits, where it can monitor the voltage level of a power supply and trigger a protective mechanism if the voltage exceeds a predefined safe threshold.

Parameter Features

- Single Input Voltage Comparator: The LM397MFX specializes in comparing a single pair of voltages, making it straightforward and effective for many comparison tasks.

- Low Input Offset Voltage: Ensures high accuracy in voltage comparison, which is crucial for sensitive applications.

- Wide Supply Voltage Range: Offers flexibility in various design voltages, accommodating a broad spectrum of application requirements.

- Open-Collector Output: Provides versatile output interfacing options, allowing for direct connection to a variety of loads or digital logic levels.

Circuit Connection Example: Overvoltage Protection Circuit

Designing an overvoltage protection circuit with the LM397MFX involves critical considerations to ensure reliable operation:

- Power Supply Connection: Connect the VCC pin of the LM397MFX (pin 5) to the power supply that is being monitored, ensuring that the supply voltage is within the IC's operational range.

- Ground Connection: Attach the GND pin (pin 2) to the system's ground to establish a common reference for voltage comparison.

- Reference Voltage Setup: Apply a fixed reference voltage, representing the maximum safe threshold, to the non-inverting input (pin 3). This can be derived from a stable voltage reference source or a precisely calculated voltage divider network.

- Voltage Monitoring: Connect the power supply voltage, which needs monitoring, to the inverting input (pin 4) of the LM397MFX.

- Protective Mechanism Activation: Utilize the open-collector output (pin 1) to control a relay or a transistor that can disconnect the load or trigger an alarm in case of an overvoltage condition. An external pull-up resistor may be required to set the proper logic level when the comparator output is inactive.

Design Considerations

When implementing a circuit with the LM397MFX, it's essential to ensure the accuracy of the reference voltage, as it determines the overvoltage threshold. The power supply for the LM397MFX should be stable and free from noise to avoid false triggering. Additionally, the output configuration, especially the choice of the pull-up resistor and the load it drives, must be carefully considered to match the circuit requirements. It's also crucial to account for the transient response and any potential delays in the protective mechanism to ensure timely intervention.

In summary, the LM397MFX serves as a reliable component in overvoltage protection circuits, providing a simple yet effective solution for monitoring voltage levels and safeguarding electronic systems. By meticulously addressing reference voltage accuracy, power supply stability, output configuration, and transient response considerations, designers can effectively leverage the LM397MFX for enhanced system protection.

LM397MFX FAQ

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6. What is the process for return or replacement of LM397MFX?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the LM397MFX we delivered, we will accept the replacement or return of the LM397MFX only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of LM397MFX.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations