78L05L-T92-B datasheet & price | pdf

Key Features of the 78L05 Voltage Regulator

The 78L05 is a compact and efficient linear voltage regulator that provides a stable 5V output. It’s perfect for low-power applications where you need a reliable 5V supply. With a 100mA current output, it can easily power small circuits, sensors, or microcontrollers. The 78L05 has built-in thermal shutdown and overcurrent protection, ensuring it stays safe under load. Its simple design makes it easy to integrate into your projects, whether you’re working with Arduino, sensors, or other low-power electronics. It’s a go-to solution when you need a clean, regulated 5V source.

78L05 Pinout

Using the 78L05 Pinout

To use the 78L05, connect your input voltage (typically 7V to 35V) to the Input pin (Pin 1), and ground to the Ground pin (Pin 2). The Output pin (Pin 3) will provide a stable 5V for your circuit. Always ensure the input voltage is higher than 5V and within the recommended range to prevent damage. The 78L05 is simple to use and reliable, but be sure not to exceed its current rating of 100mA to avoid overheating or failure.

78L05 Equivalent Models

Here’s a comparison of equivalent voltage regulators with similar packaging and features:

Substitution Tips

When replacing the 78L05, make sure the input voltage range, output voltage, and current output match your circuit’s needs. Models like the LM7805 offer higher current output (1A) but come in a larger TO-220 package. The LM1117-5.0 offers a lower dropout voltage (1.1V), which can be useful for low-voltage designs but has a higher current output rating (800mA). If you need something with similar current limitations and a compact package, the LM2950 is a suitable alternative with a lower dropout voltage of 0.5V. Always consider the dropout voltage when choosing a replacement to ensure reliable voltage regulation in your application.

78L05 Maximum Input Voltage and Testing

The 78L05 voltage regulator has a maximum input voltage of 35V. Anything higher can damage the component, so it’s important to keep the input within the specified range (typically 7V to 35V) for optimal performance.

To test the 78L05, you’ll need a multimeter. First, connect the input pin to a voltage source (within the allowed range) and the ground to the common ground. Then, measure the output pin with your multimeter. You should get a stable 5V output. If the output is too low or unstable, it might indicate that the regulator is faulty or the input voltage is outside the correct range. Always check for proper grounding and avoid drawing too much current from the output.

78L05 Voltage Regulator Circuit Overview

The 78L05 is a compact, three-terminal linear voltage regulator that provides a fixed 5V output. It’s commonly used in low-power applications where a stable 5V supply is needed.

Circuit Diagram

How It Works

In this typical application circuit:

• Pin 1 (Output): Provides the regulated 5V output.

• Pin 2 (Ground): Connected to the system ground.

• Pin 3 (Input): Receives the unregulated input voltage (e.g., 12V).

Capacitors C1 and C2 are placed at the input and output to filter noise and stabilize the voltage. While not mandatory, values of 10µF for C1 and 1µF for C2 are commonly used.

Important Considerations

• Input Voltage: Ensure the input voltage is within the specified range (typically 7V to 35V) to maintain a stable 5V output.

• Current Limitation: The 78L05 can supply up to 100mA of current. Exceeding this can cause overheating or shutdown.

• Heat Dissipation: Under higher loads, the regulator may dissipate significant heat. Adequate heat sinking is recommended to prevent thermal shutdown.

This simple and efficient circuit is ideal for powering low-current devices like microcontrollers, sensors, and small LEDs.