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

Part No.:: LM139J/PB

Manufacturer:: Texas Instruments

Package:: 14-CDIP (0.300, 7.62mm)

Datasheet:: LM139J/PB.pdf

Description:: IC COMP QUAD LPWR L OFF V 14CDIP

In Stock:: 310

Quantity:: Add To Cart

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LM139J/PB Specifications

Package/Case:
14-CDIP (0.300, 7.62mm)
Packaging:
Tube
Series:
-
ProductStatus:
Active
Type:
General Purpose
NumberofElements:
4
OutputType:
CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage-SupplySingle/Dual(±):
2V ~ 36V, ±1V ~ 18V
Voltage-InputOffset(Max):
5mV @ 30V
Current-InputBias(Max):
0.1µA @ 5V
Current-Output(Typ):
16mA @ 5V
Current-Quiescent(Max):
2.5mA
CMRRPSRR(Typ):
-
PropagationDelay(Max):
-
Hysteresis:
-
OperatingTemperature:
-55°C ~ 125°C
MountingType:
Through Hole

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LM139J/PB information

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LM139J/PB Typical application Circuitry

LM139J/PB is a quad differential comparator chip designed for precision voltage comparison in industrial, automotive, and consumer applications. It offers low input offset voltage, high input impedance, and wide supply voltage range.

Application Scenario:

In battery management systems, LM139J/PB can be utilized to monitor battery voltages and trigger alerts or cutoffs when certain voltage thresholds are reached to prevent overcharging or overdischarging.

Circuit Design:

To design a battery voltage monitoring circuit using LM139J/PB, follow these steps:

1. Voltage Divider Network:

Construct a voltage divider network using precision resistors to scale down the battery voltage to a level suitable for comparison by the LM139J/PB. Connect one end of the voltage divider to the positive terminal of the battery and the other end to one of the comparator's non-inverting input pins, such as pin 2.

2. Voltage Reference:

Provide a stable voltage reference to the other input of the comparator (inverting input) for comparison. This can be achieved using a precision voltage reference IC. Connect the output of the voltage reference to the inverting input pin of one comparator, such as pin 4.

3. Hysteresis Feedback:

To prevent oscillation and ensure stable operation, add positive feedback (hysteresis) to the comparator by connecting a resistor between the output and the inverting input (pin 4). This resistor, along with an optional capacitor, sets the hysteresis level.

4. Output Configuration:

Connect the output pin (pin 6) of the comparator to the microcontroller or other monitoring circuitry. This output signal can trigger further actions based on the comparison result, such as activating an alarm or controlling a charging circuit.

5. Power Supply:

Ensure a stable power supply is provided to LM139J/PB within its specified operating voltage range. Utilize appropriate decoupling capacitors near the power supply pins (pin 7 and pin 14) to filter out noise and maintain stability.

Considerations:

When designing the circuit, consider the following:

- Input Offset Voltage: Minimize voltage errors introduced by the comparator to ensure accurate voltage comparison.

- Temperature Stability: Account for temperature variations and select components with temperature stability suitable for the application.

- Power Consumption: Optimize power consumption of the circuit to prolong battery life, especially in portable applications.

- Noise Immunity: Implement proper filtering and shielding techniques to minimize noise interference, particularly in automotive environments.

- Response Time: Design the circuit for fast response time to detect voltage deviations promptly and take necessary actions.

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6. What is the process for return or replacement of LM139J/PB?

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

(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