L7805CV Transistor: Pinout, Datasheet and Applications

What is the L7805CV Transistor?

The ST model L7805CV is a voltage regulator in a three-end regulator TO-220 package that can be used in a wide range of applications. It ensures a steady 5V output from a higher input voltage. If sufficient heat dissipation is provided, the L1981301772 can provide an output current of more than 1A. Although these devices are primarily designed as fixed voltage regulators, they can be used with external components to obtain adjustable voltages and currents.

L7805CV Pinout

Understanding the pinout of the L7805CV is crucial for proper integration into your projects. The L7805CV has three pins, you can see the pinout diagram of L7805CV part. Which are described as follows:

Input (Pin 1): This pin receives the unregulated input voltage. The input voltage should be higher than the desired output voltage (5V) but should not exceed the maximum input voltage rating of 35V. A typical input voltage range is between 7V and 25V.

Ground (Pin 2): The ground pin is the common ground for both the input and output voltages. It serves as the reference point for the voltage regulation.

Output (Pin 3): This pin provides the regulated 5V output. It ensures a stable voltage supply to your electronic components and circuits, regardless of variations in the input voltage.

Proper connection of these pins is essential for the L7805CV to function correctly. Incorrect wiring can lead to circuit malfunction or damage to the voltage regulator.

L7805CV Transistor Parameters

Brand: ST (STMicroelectronics)

Product Category: Voltage Regulator Chip

Package: TO-220 (TO-220-3)

Packaging: Tube

Operating Temperature: 0°C to 125°C

Mounting Type: Through Hole

Basic Product Number: L7805

HTSUS Code: 8542.39.0001

Output Configuration: Positive

Output Type: Fixed

Number of Regulators: 1

Maximum Input Voltage: 35V

Output Voltage (Minimum/Fixed): 5V

Output Voltage (Maximum): -

Dropout Voltage (Maximum): 2V @ 1A (Standard)

Output Current: 1.5A

Static Current (Iq): 8mA

PSRR: 62dB (120Hz)

Control Characteristics: -

Protection Features: Overtemperature, Short Circuit

Product Application: Industrial

Circuit Diagram of L7805CV

The L7805CV chip adopts the working principle of linear voltage regulator, and regulates and controls the input voltage through the internal circuit to keep the output voltage stable.

Package of L7805CV Transistor

What is the L7805CV Voltage Regulator Used For?

The L7805CV voltage regulator is used in various applications to provide a consistent 5V power supply. Here are some common uses:

Power Supplies

The L7805CV is a popular choice in power supply circuits. It ensures a stable 5V output, which is crucial for many electronic devices and microcontrollers that require a precise voltage to operate correctly.

Battery Chargers

It is used in battery charging circuits to provide a consistent voltage, ensuring safe and efficient charging of batteries.

Communication Equipment

In communication equipment, L7805CV can be used to supply power to key components such as microprocessors, wireless modules, display screens, and storage devices.

Embedded Systems

In embedded systems, maintaining a stable voltage is critical for reliable operation. The L7805CV helps achieve this by regulating the input voltage to a steady 5V output.

DIY Electronics Projects

Hobbyists and makers frequently use the L7805CV in their DIY projects. Its ease of use and reliable performance make it an ideal choice for powering various components and modules.

Industrial Control

The control system in the industrial field often needs a stable power supply, and the 5V output voltage provided by L7805CV can meet the needs of most industrial control equipment.

Home Electronics

L7805CV can be applied to home electronics, such as home audio, TV set-top box, wireless router and other equipment, to provide stable power output.

Advantages of L7805CV

• Stable output voltage
• High current capability
• Thermal protection
• Short-circuit protection
• Low dropout voltage
• Easy to use
• Wide input voltage range
• Cost-effective
• Compact size
• Reliable performance
• Widely available

L7805CV Transistor Features

The L7805CV transistor is packed with features that make it a reliable and versatile voltage regulator. Here are some key features:

1. The L7805CV provides a fixed 5V output, which is essential for powering devices that require a stable voltage.

2. It can deliver up to 1.5A of output current, making it suitable for powering a wide range of electronic devices and circuits.

3. The L7805CV includes built-in thermal overload protection. This feature prevents the regulator from overheating by automatically shutting it down when excessive heat is detected.

4. It also features short-circuit protection, which safeguards the regulator and the connected components from damage caused by short circuits.

5. The L7805CV has a relatively low dropout voltage, which means it can maintain the regulated output voltage even when the input voltage is only slightly higher than the output voltage.

6. The regulator consumes minimal current when in operation, making it efficient and suitable for battery-powered applications.

L7805CV Datasheet

The L7805CV is a fixed 5V linear voltage regulator. It is designed to provide a stable 5V output voltage with a maximum current of 1.5A. It features built-in protection against overheating and short circuits. Click to download L7805CV Datasheet.

Electrical Characteristics

Input Voltage (Maximum): 35V

Output Voltage (Fixed): 5V

Dropout Voltage (Typical): 2V @ 1A

Output Current (Maximum): 1.5A

Quiescent Current (Iq): 8mA

Power Supply Rejection Ratio (PSRR): 62dB at 120Hz

Storage Temperature: -65°C to +150°C

Operating Junction Temperature: 0°C to +125°C

Thermal Resistance Junction to Ambient: Typically 65°C/W (TO-220 package)

Thermal Resistance Junction to Case: Typically 4°C/W (TO-220 package)

L7805CV Equivalents

What is the Difference Between L7805CV and L7805CP?

The L7805CV and L7805CP are both voltage regulators from the same family, but they have some differences mainly in their packaging and thermal characteristics.

L7805CV typically comes in a TO-220 package. This package is known for its good heat dissipation properties and is commonly used in power supply applications. L7805CP can come in different packages such as TO-220 or TO-3. The specific package may vary depending on the manufacturer or supplier. The TO-3 package, for example, offers enhanced heat dissipation but may be less common in newer designs.

The thermal characteristics can differ slightly between packages as well. The TO-220 package of the L7805CV generally provides good thermal performance and is suitable for moderate heat dissipation needs. The L7805CP's thermal performance will depend on its package. For instance, the TO-3 package, if used, provides even better heat dissipation compared to the TO-220 package. L7805CV and L7805CP are essentially variants of the same regulator but may have different tolerances or slight variations in specifications based on their packaging.

Overall, the choice between L7805CV and L7805CP may depend on the specific requirements of your application, such as packaging preferences or thermal management needs.

What is the Maximum Input Voltage of L7805CV?

The maximum input voltage for the L7805CV voltage regulator is 35V. However, for optimal performance and to ensure reliable operation, it is generally recommended to use an input voltage between 7V and 25V. Exceeding the maximum input voltage can lead to excessive heat dissipation and potential damage to the regulator. It is important to provide adequate heat sinking if operating near the upper limit of the input voltage range to prevent overheating and maintain stable operation.

How to Use the L7805CV Voltage Regulator Effectively?

To use the L7805CV voltage regulator effectively, follow these guidelines:

1. Input Capacitor

Place a capacitor (typically 0.33µF) close to the input pin. This capacitor helps filter out any noise or fluctuations in the input voltage, ensuring a stable supply to the regulator.

2. Output Capacitor

Add a capacitor (typically 0.1µF) near the output pin. This capacitor improves the stability of the output voltage and helps to maintain a steady 5V output.

3. Heat Dissipation

Attach a heatsink to the L7805CV if the output current is high or if the input-to-output voltage difference is large. Proper heat dissipation is crucial to prevent the regulator from overheating and to ensure reliable operation. Check the datasheet for recommended heatsink sizes and mounting methods.

4. Input Voltage Range

Ensure that the input voltage is within the recommended range of 7V to 25V. The input voltage should always be higher than the output voltage (5V) by at least the dropout voltage to maintain a stable 5V output.

5. Proper Wiring

Double-check the pin connections: Input (Pin 1), Ground (Pin 2), and Output (Pin 3). Incorrect wiring can lead to circuit malfunction or damage to the regulator.

6. Load Current Considerations

Be mindful of the load current. The L7805CV can supply up to 1.5A. Ensure that the connected load does not exceed this current rating to avoid overloading the regulator.

7. Filter Noise

For applications sensitive to noise, consider adding additional capacitors or filtering components as needed to reduce ripple and noise in the power supply.

8. PCB Layout

Ensure a good PCB layout with short and thick traces for power connections to minimize voltage drops and improve overall performance. Proper grounding is essential for the stable operation of the regulator.

FAQs

1. Can the L7805CV handle high current loads?

Yes, the L7805CV can handle up to 1.5A of current. Ensure proper heat dissipation to prevent thermal shutdown.

2. Is the L7805CV suitable for battery-powered projects?

Yes, it can be used in battery-powered projects. Ensure the input voltage is within the recommended range.

3. How do I protect the L7805CV from overheating?

Use a heatsink to dissipate heat. Ensure proper ventilation around the component.

4. Can I use the L7805CV with an input voltage of 12V?

Yes, 12V is within the recommended input voltage range. It will effectively regulate the voltage to 5V.

5. What capacitors should I use with the L7805CV?

Use a 0.33µF capacitor at the input and a 0.1µF capacitor at the output for stability and noise reduction.

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