LM380 vs LM386: What are Differences and How to Choose

The LM380 and LM386 are two popular audio amplifier integrated circuits that have earned their place in the world of electronics due to their compact size and audio amplification capabilities. While both ICs are designed to amplify audio signals, they differ in terms of features, performance, and applications.

Understanding the differences between the LM380 and LM386 is crucial for making informed decisions when selecting the right amplifier for your project. In this article, we will explore the distinctions between the LM380 and LM386 audio amplifier ICs, helping you navigate their unique characteristics and choose the most suitable option for your audio amplification needs.

Part 1. What are Audio Amplifier Integrated Circuits

Audio amplifier integrated circuits (ICs) are electronic devices designed to amplify low-power audio signals from sources like microphones, musical instruments, or audio players. These ICs provide the necessary gain and power to drive speakers, headphones, or other audio output devices. They are commonly used in a wide range of applications to enhance the volume and quality of audio signals.

Audio amplifier ICs come in various configurations and power levels to accommodate different audio system requirements. They can be used in devices such as audio receivers, portable speakers, headphones, intercom systems, radios, musical instruments, and more. These ICs simplify circuit design by integrating amplifier circuitry into a single package, reducing the need for external components and simplifying the overall design process.

Part 2. What is LM380

The LM380 is a type of integrated circuit (IC) or chip that functions as an audio amplifier. It is designed to amplify low-power audio signals to a level suitable for driving speakers or headphones. The LM380 is commonly used in various audio applications, such as portable radios, intercom systems, small public address (PA) systems, and other electronics where audio amplification is needed.

#1. LM380 Pinout

LM380 Pinout Description:

• Pin 1 (BP): Bypass Pin - Used for connecting a bypass capacitor to improve high-frequency response and stability.
• Pin 2 (IN+): In-Phase Input - Positive input terminal for the audio signal.
• Pin 3 (GND): Ground Pin - Reference ground for the IC.
• Pin 4 (GND): Ground Pin - Reference ground for the IC.
• Pin 5 (GND): Ground Pin - Reference ground for the IC.
• Pin 6 (IN-): Inverted Input - Negative input terminal for the audio signal.
• Pin 7 (GND): Ground Pin - Reference ground for the IC.
• Pin 8 (OUT): Output Pin - Amplified audio output, connected to the load (speaker or headphones).
• Pin 9 (NC): Normally Closed - Not connected in typical applications.
• Pin 10 (GND): Ground Pin - Reference ground for the IC.
• Pin 11 (GND): Ground Pin - Reference ground for the IC.
• Pin 12 (GND): Ground Pin - Reference ground for the IC.
• Pin 13 (NC): Normally Closed - Not connected in typical applications.
• Pin 14 (+VCC): Positive Supply Voltage Pin - Connect to the positive terminal of the power supply.

#2. LM380 Features

• Single supply voltage
• Higher output power
• Internal fixed gain setting
• Suitable for a wide range of applications
• Low harmonic distortion
• Internal compensation circuitry
• Thermal and short-circuit protection available on some versions
• Easy-to-use DIP package

#3. LM380 Application

The LM380 is suitable for many low power audio amplification applications, especially where medium to high output power is required.

• Small intercom system
• Small Public Address System
• Portable Radio
• Amplifier
• Electronic Doorbell
• Voice Alarm System
• Interactive Toys
• Car Audio System

#4. LM380 Datasheet

Learn and Download LM380 datasheet here>>

Part 3. What is LM386

The LM386 IC is a widely used audio amplifier integrated circuit (IC) that is designed to amplify low-power audio signals. It's a popular choice for various audio applications due to its simplicity, ease of use, and relatively low component count. The LM386 is commonly used in projects where amplifying audio signals from sources like microphones, radios, or other audio devices is necessary.

#1. LM386 Pinout

LM386 Pinout Description:

• Pin 1 (GAIN): Gain Control Pin - Used to set the gain of the IC by connecting a capacitor to adjust the amplification level.
• Pin 2 (IN-): Inverting Input - The Inverting Pin of the amplifier is normally grounded. Connect the negative terminal of the audio input source here.
• Pin 3 (IN+): Non-Inverting Input - The Non-Inverting pin is provided with the audio signal. Connect the positive terminal of the audio input source here.
• Pin 4 (GND): Ground Pin - Connected to the ground of the system.
• Pin 5 (Vout): Amplified Audio Output Pin - Provides the amplified audio output, connected to the speaker or headphones.
• Pin 6 (Vss/Vcc): Power Pin - Connected to the power supply. Typically, connected to the positive supply voltage (Vcc) for proper operation.
• Pin 7 (Bypass): Bypass Pin - Used for connecting a decoupling or bypass capacitor to improve stability and filter high-frequency noise.

#2. LM386 Features

• Low noise and low distortion circuit design
• Small size (8-pin DIP package)
• Only 24mW at 6V static supply
• Current consumption of only 4mA in standby mode
• Wide supply voltage range from 4V to 18V
• Requires few external components
• Minimum to maximum voltage gain from 20 to 200
• Also available in VSSOP and SOIC packages
• The LM386N-4 has a maximum output of 1000mW and a supply voltage of 16V.

#3. LM386 Application

The LM386 is a popular low-power audio amplifier IC for a wide range of portable and low-power applications requiring small to medium power audio amplification.

• Portable audio devices (e.g. MP3 players, portable music players)
• Electronic games and toys
• Small wireless speaker systems
• DIY audio projects and experiments
• Interactive installations and artwork
• Low-power audio applications
• Analog sound synthesizers

#4. LM386 Datasheet

Learn and Download LM386 datasheet here>>

Part 4. The Differences Between LM380 and LM386

Here are the differences between LM380 and LM386:

Part 5. How to Choose Between LM380 VS LM386

Choosing between the LM380 and LM386 audio amplifier ICs depends on the specific requirements of your project or application. Here are some factors to consider when making your decision:

💎Output Power Requirement:

• If you need higher output power for driving larger speakers or covering larger areas, the LM380 might be more suitable due to its higher output power capability.
• If your application requires moderate output power for smaller speakers or headphones, the LM386 could be a better choice.

💎Supply Voltage:

Consider the available power supply voltage in your application. If you have a lower supply voltage (4V to 12V), the LM386 is designed for this range. If you have a higher supply voltage (10V to 22V), the LM380 could be a better fit.

💎Gain Control:

• If you prefer to control the gain internally through the IC itself, the LM380 offers internal gain settings.
• If you want to adjust gain externally using additional components, the LM386 provides external gain control.

💎Application Complexity:

• If you're looking for a simpler design with fewer external components, the LM386's straightforward external component requirements might be more suitable.
• If you're comfortable working with additional components and need more control over the gain, the LM380's internal gain settings could be advantageous.

💎Application Type:

• If your application involves projects like intercom systems, small public address systems, or radios, where higher output power might be needed, the LM380 could be a better match.
• For portable audio devices, hobby projects, and scenarios where moderate output power is sufficient, the LM386 could be a good choice.

💎Budget and Availability:

Check the pricing and availability of both ICs. Sometimes, one IC might be more cost-effective or readily available than the other, influencing your decision.

💎Performance Requirements:

Consider factors such as distortion levels and input/output impedance to ensure that the chosen IC meets your performance requirements.

💎Size and Space Constraints:

The physical size of the IC package might be a consideration if you have size constraints in your design. Both the LM380 and LM386 typically come in DIP packages, but verify the specific dimensions.

Further Reading: 5 Best Audio Amplifier IC in the Market 2023

Conclusion

In conclusion, the choice between the LM380 and LM386 audio amplifier ICs boils down to your specific audio amplification requirements and project constraints. The LM380 offers higher output power and lower total harmonic distortion (THD), making it suitable for applications demanding higher audio quality and power levels. On the other hand, the LM386 is renowned for its simplicity, low power consumption, and ease of use, making it a go-to choice for battery-powered devices and smaller audio applications.

When selecting between the LM380 and LM386, carefully consider factors such as desired output power, available power supply, distortion levels, and board space. Stay updated with the latest advancements in audio amplifier technology, explore datasheets, and experiment with various setups to determine the best-fit amplifier for your project.