What is the Additional Feature ?

Name: LM311NG
Brand: ON Semiconductor
SKU: LM311NG
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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ON Semiconductor LM311NG

Part No.:: LM311NG

Manufacturer:: ON Semiconductor

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

Datasheet:: LM311NG.pdf

Description:: IC COMPARATOR SGL HI VOLT 8DIP

In Stock:: 3244

Quantity:: Add To Cart

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LM311NG 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):
-
Current-Quiescent(Max):
7.5mA
CMRRPSRR(Typ):
-
PropagationDelay(Max):
-
Hysteresis:
-
OperatingTemperature:
0°C ~ 70°C
MountingType:
Through Hole

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LM311NG information

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LM311NG Typical application Circuitry

LM311NG

LM311NG is a specific model within the LM311 family of voltage comparators, known for its precision and versatility in various electronic applications.

Application Scenarios for LM311NG

- Zero-Crossing Detectors: Commonly used in AC power control circuits to detect the point where the AC signal crosses zero voltage.

Level shifters: These devices move the logic levels of digital circuits from one voltage domain to another.

- Relay Drivers: To control relays in response to a specific voltage level, used in automatic switching circuits.

- Tachometers: For measuring the speed of motors or rotating equipment by converting the frequency of pulses to a voltage level.

Parameter Features of LM311NG

- Versatile Power Supply Options: Capable of operating with a wide range of supply voltages, from single supply configurations to dual supplies.

- Open-Collector Output: Allows for direct interfacing with different logic levels, enabling the LM311NG to control a variety of loads.

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

- Input Offset Voltage: Low input offset voltage, enhancing the precision of voltage comparisons in sensitive applications.

Application Example: Motor Speed Monitoring Circuit

Designing a Motor Speed Monitoring Circuit Using LM311NG

To design a circuit that monitors the speed of a motor and activates an LED when the speed exceeds a predetermined threshold, follow these detailed instructions focusing on key pin connections and design considerations:

- Power Supply Connections: Connect the positive terminal of your power source to pin 8 (Vcc) of the LM311NG and the negative terminal to pin 1 (GND). This allows the LM311NG to operate within its specified voltage range, accommodating the needs of your application.

- Speed Signal Input: Connect the output of a speed sensor, which generates a voltage proportional to the motor speed, to the non-inverting input (pin 3) of the LM311NG. This may be an optical sensor positioned close to the motor, or it may be a Hall effect sensor.

- Threshold Voltage Setup: Use a potentiometer or a fixed voltage divider connected from Vcc to ground, with the tap or midpoint connected to the inverting input (pin 2) of LM311NG. This sets the voltage threshold corresponding to the target motor speed.

- Output Configuration: Connect the open-collector output (pin 7) of LM311NG to an LED (with a suitable current-limiting resistor) and then to the positive supply voltage. The LED will illuminate when the motor speed exceeds the set threshold, indicating an over-speed condition.

- Feedback for Hysteresis: Add a resistor between the output (pin 7) and the non-inverting input (pin 3) to introduce hysteresis, preventing false triggering due to noise or small fluctuations in the motor speed signal.

Design Considerations for LM311NG

When designing with LM311NG, it's important to consider:

- Input Signal Conditioning: Ensure the signal from the speed sensor is clean and free of noise. Filtering may be necessary to obtain a stable input signal for the LM311NG.

- Output Load: Since the LM311NG has an open-collector output, remember to include a pull-up resistor if you're not driving a load directly connected to a higher voltage supply.

- Supply Decoupling: Place a decoupling capacitor close to the LM311NG power supply pins to ensure stable operation, especially in noisy environments.

- Mounting and Thermal Considerations: Ensure proper mounting and, if necessary, heat sinking to maintain the LM311NG within its operating temperature range, especially in high-power applications or challenging thermal environments.

By carefully implementing these design strategies, the LM311NG can be effectively utilized in a motor speed monitoring circuit, providing reliable and accurate speed detection for safety or performance tuning purposes.

LM311NG FAQ

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6. What is the process for return or replacement of LM311NG?

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 LM311NG we delivered, we will accept the replacement or return of the LM311NG 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 LM311NG.

(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