사양
| 속성 | 가치 |
| Package | Tube |
| ProductStatus | Not For New Designs |
| OutputConfiguration | Positive |
| OutputType | Fixed |
| NumberofRegulators | 1 |
| Voltage-Input(Max) | 7.5V |
| Voltage-Output(Min/Fixed) | 3.3V |
| VoltageDropout(Max) | 0.2V @ 100mA |
| Current-Output | 1A |
| ProtectionFeatures | Over Temperature, Short Circuit |
| OperatingTemperature | -40°C ~ 125°C |
| MountingType | Through Hole |
| Package/Case | TO-220-3 |
개요
Description
The LM3940IT-3.3 is a low dropout regulator designed to convert a 5V input to a stable 3.3V output, ideal for powering low voltage digital circuits. With a dropout voltage of 0.5V at full load, it efficiently maintains regulation even with minimal input-output voltage differential. The device delivers up to 1A of output current and features built-in protection mechanisms like current limiting and thermal shutdown, ensuring robust performance and longevity. The LM3940IT-3.3 is housed in a TO-220 package, offering ease of installation and effective heat dissipation.
Key characteristics include a low quiescent current, making the LM3940IT-3.3 suitable for battery-powered applications. Its simple design requires minimal external components—typically just two capacitors for stability—enhancing its practicality for various applications. This regulator is commonly used in electronics where a reliable 3.3V supply is vital, such as microcontrollers, sensors, and other digital devices. Its simplicity, efficiency, and reliability make it a popular choice for designers needing a straightforward voltage regulation solution.
Key characteristics include a low quiescent current, making the LM3940IT-3.3 suitable for battery-powered applications. Its simple design requires minimal external components—typically just two capacitors for stability—enhancing its practicality for various applications. This regulator is commonly used in electronics where a reliable 3.3V supply is vital, such as microcontrollers, sensors, and other digital devices. Its simplicity, efficiency, and reliability make it a popular choice for designers needing a straightforward voltage regulation solution.
Equivalent
The LM3940IT-3.3 is a 3.3V voltage regulator. Equivalent products include:
1. LD1117-3.3 - Offers similar output voltage and current capabilities.
2. MIC29300-3.3WT - Features comparable dropout voltage and thermal characteristics.
3. AMS1117-3.3 - Commonly used alternative with similar specifications.
4. LP38691/LP38692 - These offer low dropout and stable output.
5. NCP1117-3.3 - Another low dropout voltage regulator with similar output.
Ensure compatibility with your circuit requirements before substituting.
1. LD1117-3.3 - Offers similar output voltage and current capabilities.
2. MIC29300-3.3WT - Features comparable dropout voltage and thermal characteristics.
3. AMS1117-3.3 - Commonly used alternative with similar specifications.
4. LP38691/LP38692 - These offer low dropout and stable output.
5. NCP1117-3.3 - Another low dropout voltage regulator with similar output.
Ensure compatibility with your circuit requirements before substituting.
Features
The LM3940IT-3.3 is a linear voltage regulator designed to provide a steady 3.3V output from a higher voltage input, typically used in battery-powered devices. Key features include:
1. Output Voltage: Fixed output voltage of 3.3V.
2. Current Capacity: Capable of delivering up to 1A of output current.
3. Input Voltage Range: Operates with input voltages ranging from 4.5V to 5.5V.
4. Low Dropout Voltage: Typically around 500mV at full load, making it suitable for low-voltage applications.
5. Thermal Protection: Integrated thermal shutdown to prevent damage from overheating.
6. Short Circuit Protection: Protects the device against output short circuits.
7. Low Quiescent Current: Consumes minimal current when not driving a load, enhancing efficiency in battery-operated devices.
8. Package: Available in TO-220 package, suitable for heat dissipation.
These features make the LM3940IT-3.3 ideal for applications requiring efficient and reliable voltage regulation, such as powering logic circuits or microcontrollers in portable electronics.
1. Output Voltage: Fixed output voltage of 3.3V.
2. Current Capacity: Capable of delivering up to 1A of output current.
3. Input Voltage Range: Operates with input voltages ranging from 4.5V to 5.5V.
4. Low Dropout Voltage: Typically around 500mV at full load, making it suitable for low-voltage applications.
5. Thermal Protection: Integrated thermal shutdown to prevent damage from overheating.
6. Short Circuit Protection: Protects the device against output short circuits.
7. Low Quiescent Current: Consumes minimal current when not driving a load, enhancing efficiency in battery-operated devices.
8. Package: Available in TO-220 package, suitable for heat dissipation.
These features make the LM3940IT-3.3 ideal for applications requiring efficient and reliable voltage regulation, such as powering logic circuits or microcontrollers in portable electronics.
Pinout
The LM3940IT-3.3 is a low dropout voltage regulator specifically designed to provide a 3.3V output from a higher input voltage source. It has a pin count of 5, which typically includes:
1. Input (IN): The pin where the input voltage is supplied.
2. Output (OUT): The pin where the regulated 3.3V output voltage is available.
3. Ground (GND): The pin connected to the ground of the circuit.
4. Adjustment (ADJ): (Depending on the specific package or version) May be used for output voltage adjustment or left unconnected if the fixed output is required.
5. N/C (No Connect): (If present) Not connected to the internal circuitry, often used for mechanical support or thermal purposes.
The primary function of the LM3940IT-3.3 is to maintain a stable 3.3V output voltage with a minimum dropout voltage, making it suitable for applications requiring a reliable power supply from battery or other DC sources close to 3.3V.
1. Input (IN): The pin where the input voltage is supplied.
2. Output (OUT): The pin where the regulated 3.3V output voltage is available.
3. Ground (GND): The pin connected to the ground of the circuit.
4. Adjustment (ADJ): (Depending on the specific package or version) May be used for output voltage adjustment or left unconnected if the fixed output is required.
5. N/C (No Connect): (If present) Not connected to the internal circuitry, often used for mechanical support or thermal purposes.
The primary function of the LM3940IT-3.3 is to maintain a stable 3.3V output voltage with a minimum dropout voltage, making it suitable for applications requiring a reliable power supply from battery or other DC sources close to 3.3V.
Manufacturer
The LM3940IT-3.3 is manufactured by Texas Instruments. Texas Instruments is a global semiconductor company that designs and produces a range of electronic components, including integrated circuits and analog chips. They are known for their innovation in the electronics industry, providing key components for various applications such as automotive, industrial, personal electronics, and communications equipment.
Application
The LM3940IT-3.3 is a low-dropout (LDO) voltage regulator specifically designed to provide a stable 3.3V output from higher input voltages. Its primary application areas include powering low-voltage digital circuits, microcontrollers, and processors in consumer electronics, automotive systems, and communication devices. The regulator is also suitable for battery-powered equipment due to its low dropout voltage, efficient power management, and minimal power dissipation. Additionally, it can be used in applications requiring stable voltage outputs despite fluctuations in input voltage or load conditions, making it ideal for embedded systems and portable devices.
Package
The LM3940IT-3.3 is a low-dropout (LDO) linear voltage regulator packaged in the TO-220. It is designed to output a fixed voltage of 3.3V and can supply a current up to 1A. The TO-220 package is a through-hole type, suitable for applications requiring a stable voltage supply.
