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Name: LM311N
Brand: STMicroelectronics
SKU: LM311N
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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STMicroelectronics LM311N

Part No.:: LM311N

Manufacturer:: STMicroelectronics

Package:: 8-DIP (0.300, 7.62mm)

Datasheet:: LM311N.pdf

Description:: IC VOLTAGE COMPARATOR 8-DIP

In Stock:: 2259

Quantity:: Add To Cart

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LM311N Specifications

Package/Case:
8-DIP (0.300, 7.62mm)
Packaging:
Tube
Series:
-
ProductStatus:
Obsolete
Type:
General Purpose
NumberofElements:
1
OutputType:
DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
Voltage-SupplySingle/Dual(±):
5V ~ 30V, ±2.5V ~ 15V
Voltage-InputOffset(Max):
7.5mV @ ±15V
Current-InputBias(Max):
0.25µA @ ±15V
Current-Output(Typ):
50mA
Current-Quiescent(Max):
7.5mA
CMRRPSRR(Typ):
-
PropagationDelay(Max):
-
Hysteresis:
-
OperatingTemperature:
0°C ~ 70°C
MountingType:
Through Hole

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LM311N information

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LM311N Typical application Circuitry

LM311N

High-speed voltage comparator LM311N is renowned for its dependable performance across a variety of applications. It is designed to operate from single or dual power supplies and is capable of driving various forms of loads, including TTL, MOS, or relay coils. This versatility makes the LM311N suitable for a variety of applications where precise voltage comparisons are required.

Application Scenarios for LM311N

- Voltage Level Detection: Ideal for sensing and comparing different voltage levels in power supply circuits, battery chargers, and voltage monitors.

- Window Comparator: Used in applications requiring a specific voltage range detection, such as signal conditioning circuits.

- Pulse Generators: Can be used to generate precise timing pulses in synchronization circuits or timing applications.

- Motor Control: In motor driver circuits, LM311N can be used to provide overcurrent protection or to sense motor stall conditions.

Parameter Features of LM311N

- Wide Supply Voltage Range: Can operate with a wide range of supply voltages, from single supply configurations to dual supplies, accommodating various circuit designs.

- Output Compatibility: The open-collector output of LM311N allows for direct interfacing with different logic levels and types, including TTL and CMOS.

- Fast Response Time: Designed for high-speed operation, providing quick and accurate voltage comparisons.

- Differential Input Voltage Range: Capable of handling a wide range of differential input voltages, making it suitable for a broad spectrum of signal levels.

Application Example: Overvoltage Protection Circuit

Designing an Overvoltage Protection Circuit Using LM311N

To design an overvoltage protection circuit that triggers a relay to disconnect the load when the input voltage exceeds a set threshold, follow these detailed instructions focusing on key pin connections and design considerations:

- Power Supply Connections: Connect the positive supply voltage to pin 8 (Vcc) of the LM311N and the negative supply to pin 1 (GND). This comparator can function with various supply voltages, so select a voltage that matches your system requirements.

- Voltage Threshold Setting: Employ a voltage divider by connecting two resistors in series from ground to Vcc. Connect the midpoint to the inverting input (pin 2) of LM311N. This sets your reference threshold voltage.

- Input Voltage Sensing: Connect the non-inverting input (pin 3) of LM311N to the point in the circuit where the voltage needs to be monitored.The output of the LM311N will go high when the detected voltage reaches the voltage divider's threshold.

- Output Configuration: Connect the output (pin 7) of LM311N to the base of an NPN transistor through a current-limiting resistor. The transistor's emitter is grounded, and its collector is linked to one relay coil terminal while the other terminal is connected to Vcc. A diode should be placed in parallel with the relay coil to protect against voltage spikes when the relay is deactivated.

- Feedback for Hysteresis: Connect a resistor between the output (pin 7) and the non-inverting input (pin 3) to introduce hysteresis, preventing relay chatter around the threshold voltage.

Design Considerations for LM311N

When designing circuits with LM311N, consider the following:

- Input Biasing: Ensure that the input signals are within the operating range of LM311N. Proper biasing is crucial in single-supply operations to keep the inputs within the comparator's common-mode range.

- Output Load: Be mindful of the load connected to the LM311N output. The open-collector output requires an external pull-up resistor if not driving a transistor or relay directly.

- Supply Decoupling: Use a decoupling capacitor close to the LM311N power supply pins to stabilize the supply voltage and reduce noise.

- Temperature Effects: Consider the temperature coefficients of components in the threshold-setting voltage divider, as temperature variations can affect the accuracy of the voltage threshold.

By following these guidelines, the LM311N can be effectively utilized in an overvoltage protection circuit, providing a reliable and responsive protection mechanism for sensitive electronic devices.

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6. What is the process for return or replacement of LM311N?

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 LM311N we delivered, we will accept the replacement or return of the LM311N 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 LM311N.

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

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(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations