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Name: LM211DT
Brand: STMicroelectronics
SKU: LM211DT
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 LM211DT

Part No.:: LM211DT

Manufacturer:: STMicroelectronics

Package:: 8-SOIC (0.154, 3.90mm Width)

Datasheet:: LM211DT.pdf

Description:: IC VOLTAGE COMPARATOR 8-SOIC

In Stock:: 11608

Quantity:: Add To Cart

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LM211DT Typical application Circuitry

LM211DT

LM211DT is a voltage comparator chip that is designed to provide fast and reliable comparison of input voltages. It is widely used in applications that require a decision to be made based on the comparison of two voltages, such as zero-crossing detectors, level shifters, and simple analog-to-digital converters.

Application Scenarios for LM211DT

- Zero-Crossing Detectors: In power electronics, for detecting the point where an AC signal crosses the zero-voltage level to control power switching devices.

- Window Comparators: For monitoring a signal to ensure it stays within a certain voltage range, often used in battery charging circuits to prevent overcharging.

- Level Shifters: In digital circuits, to translate signal levels from one voltage domain to another, ensuring compatibility between different logic families.

- Relay Drivers: To control the on/off state of relays based on a specific voltage threshold, used in various automation and control applications.

Parameter Features of LM211DT

- Fast Response Time: Ensures quick decision-making in applications where timing is critical.

- Wide Supply Voltage Range: Compatible with a broad range of supply voltages, accommodating diverse application requirements.

- Differential Input Voltage Range: Capable of handling a wide range of differential input voltages, making it suitable for various comparison tasks.

- Output Stage: Can directly drive loads, including relays and lamps, simplifying circuit design.

Application Example: Overvoltage Protection Circuit

Designing an Overvoltage Protection Circuit Using LM211DT

To create a circuit that disconnects a load when the input voltage exceeds a certain threshold, using the LM211DT, follow these detailed instructions, focusing on key pin connections and design considerations:

- Power Supply Connection: Connect the positive supply voltage to the Vcc pin of LM211DT and the negative supply or ground to the GND pin. Ensure the supply voltage is within the chip's specified range.

- Voltage Threshold Setting: Use a voltage divider with two resistors connected from Vcc to ground. Tap the midpoint and connect it to the inverting input (−) of LM211DT. This sets your reference threshold voltage.

- Input Voltage Sensing: Connect the non-inverting input (+) of LM211DT to the point in the circuit where the voltage needs to be monitored. When the sensed voltage exceeds the threshold, the output of LM211DT will change state.

- Output Configuration: Connect the output of LM211DT to the control gate of a MOSFET or to the base of a transistor, which in turn controls the connection of the load. A resistor may be needed in series with the base/gate for current limiting.

- Protective Diode: Place a flyback diode across the load, especially if it's inductive, to protect the LM211DT and switching transistor from voltage spikes when the load is disconnected.

Design Considerations for LM211DT

When designing with LM211DT, consider the following:

- Hysteresis: Adding positive feedback through a resistor between the output and the non-inverting input (+) can introduce hysteresis, preventing oscillations near the threshold voltage.

- Input Bias Current: Consider the effect of input bias current on the voltage divider at the inverting input, as it might slightly shift the threshold voltage.

- Output Load: Ensure the output load, whether a relay, LED, or transistor base, does not exceed the current driving capability of the LM211DT.

- Noise Immunity: Use bypass capacitors near the power supply pins to filter out noise and provide stable operation.

By carefully implementing these guidelines, the LM211DT can be effectively utilized in an overvoltage protection circuit, providing a reliable means to safeguard sensitive electronic equipment from damaging voltage levels.

LM211DT information

LM211DT Specifications

Package/Case:
8-SOIC (0.154, 3.90mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
Series:
-
ProductStatus:
Active
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):
3mV @ ±15V
Current-InputBias(Max):
0.1µA @ ±15V
Current-Output(Typ):
50mA
Current-Quiescent(Max):
6mA
CMRRPSRR(Typ):
-
PropagationDelay(Max):
-
Hysteresis:
-
OperatingTemperature:
-40°C ~ 105°C
MountingType:
Surface Mount

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3. Are the LM211DT price and inventory displayed accurate?

The price and inventory of LM211DT fluctuates frequently and cannot be updated in time, it will be updated periodically within 24 hours. And, our quotation usually expires after 5 days.

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6. What is the process for return or replacement of LM211DT?

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 LM211DT we delivered, we will accept the replacement or return of the LM211DT 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 LM211DT.

(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