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Name: LM139J/SCA
Brand: Texas Instruments
SKU: LM139J/SCA
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 LM139J/SCA

Part No.:: LM139J/SCA

Manufacturer:: Texas Instruments

Package:: -

Datasheet:

Description:: QUAD DIFFERENTIAL COMPARATOR

In Stock:: 2514

Quantity:: Add To Cart

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LM139J/SCA Specifications

Package/Case:
-
Packaging:
Bulk
Series:
*
ProductStatus:
Active
Type:
-
NumberofElements:
-
OutputType:
-
Voltage-SupplySingle/Dual(±):
-
Voltage-InputOffset(Max):
-
Current-InputBias(Max):
-
Current-Output(Typ):
-
Current-Quiescent(Max):
-
CMRRPSRR(Typ):
-
PropagationDelay(Max):
-
Hysteresis:
-
OperatingTemperature:
-
MountingType:
-

LM139J/SCA this integrated circuit is available in factory sealed anti static packs. at icwhale.com. Please read product page below detail information. including LM139J/SCA price, data-sheet, in-stock availability, technical difficulties. Also. Quickly Enter the access of compare listing to find out replaceable electronic parts. If you want to retrieve comprehensive data for LM139J/SCA to optimize the supply chain (including cross references, life-cycle, parametric, counterfeit risk, obsolescence managements forecasts), please contact to our Tech-supports team.

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LM139J/SCA information

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LM139J/SCA Typical application Circuitry

LM139J/SCA is a quad comparator chip commonly used for voltage level detection and signal conditioning in various electronic circuits. It features high-speed operation, low input offset voltage, and wide supply voltage range.

Application Scenario:

In motor control systems, LM139J/SCA can be utilized to sense motor phase currents and provide feedback for closed-loop control, ensuring smooth and efficient motor operation.

Circuit Design:

To design a motor phase current sensing circuit using LM139J/SCA, follow these steps:

1. Current Sensing:

Connect the motor phase current to a sense resistor. Connect one end of the sense resistor to the inverting input of each comparator in LM139J/SCA, and connect the non-inverting inputs to a reference voltage representing zero current.

2. Hysteresis:

To prevent oscillations and ensure stable operation, add positive feedback (hysteresis) to each comparator by connecting a resistor from the output to the non-inverting input. Connect a capacitor in parallel with this resistor for noise filtering.

3. Output Configuration:

Connect the outputs of the comparators to the input pins of a microcontroller or control circuit. These outputs indicate the current direction or exceedance of predefined thresholds.

4. Power Supply:

Ensure stable power supply connections for LM139J/SCA and decouple the supply pins with capacitors to minimize noise and ensure proper operation.

5. Filtering:

Add low-pass filters to the input and output signals to reduce noise and improve the accuracy of current sensing, especially in noisy environments.

Considerations:

When designing the circuit, it's essential to consider:

- Sensitivity: Choose an appropriate sense resistor value to ensure optimal sensitivity without causing excessive power dissipation.

- Noise Immunity: Implement proper filtering techniques to minimize noise interference and ensure reliable current sensing.

- Temperature Drift: Account for temperature variations by selecting components with low temperature coefficients or implementing temperature compensation techniques.

- Calibration: Calibrate the circuit to compensate for component tolerances and ensure accurate current measurements across the entire operating range.

- Overcurrent Protection: Incorporate overcurrent protection mechanisms to prevent damage to the circuit and connected devices in case of excessive current flow.

LM139J/SCA FAQ

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3. Are the LM139J/SCA price and inventory displayed accurate?

The price and inventory of LM139J/SCA 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 LM139J/SCA?

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 LM139J/SCA we delivered, we will accept the replacement or return of the LM139J/SCA 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 LM139J/SCA.

(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