NJM386BM

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics:
  • Low voltage operation
  • Low power consumption
  • Small package size
  • High gain
• Package: DIP-8 (Dual In-line Package)
• Essence: Single channel audio amplifier
• Packaging/Quantity: Available in reels of 2,500 units

Specifications

• Supply Voltage: 4V to 12V
• Output Power: 1W (at 9V, 8Ω load)
• Total Harmonic Distortion: 0.2% (at 1kHz, 0.5W)
• Input Resistance: 50kΩ
• Gain Bandwidth Product: 300kHz
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The NJM386BM IC has a total of 8 pins arranged as follows:

___________ | | 1 | 2 3 4 | 8 |___________| | | 7 | 6 5 | |_________|

1. Non-Inverting Input (+IN): This pin is used to connect the input audio signal.
2. Inverting Input (-IN): This pin is connected to the ground or reference voltage.
3. Output (OUT): The amplified audio signal is available at this pin.
4. VCC: Positive supply voltage is connected to this pin.
5. Bypass Capacitor (BYPASS): Connects an external capacitor for noise reduction.
6. Gain Control (GAIN): Adjusts the amplification level.
7. Bootstrap Capacitor (BOOT): Connects an external capacitor for stability improvement.
8. Ground (GND): Connected to the ground or reference voltage.

Functional Features

• Low voltage operation allows for battery-powered applications.
• Low power consumption ensures energy efficiency.
• Small package size enables compact designs.
• High gain amplifies weak audio signals effectively.

Advantages and Disadvantages

Advantages

• Suitable for portable audio devices due to low voltage operation and small package size.
• Provides good audio quality with low distortion.
• Easy to use and integrate into various circuits.
• Cost-effective solution for audio amplification needs.

Disadvantages

• Limited output power, not suitable for high-power audio applications.
• Requires external components for stability and noise reduction.

Working Principles

The NJM386BM is a single channel audio amplifier that operates on a low voltage supply. It utilizes an internal operational amplifier to amplify the input audio signal. The gain of the amplifier can be adjusted using the gain control pin. The amplified audio signal is then available at the output pin. The IC requires external capacitors for stability improvement and noise reduction.

Detailed Application Field Plans

The NJM386BM is commonly used in various audio applications, including:

1. Portable audio devices: MP3 players, smartphones, and portable speakers.
2. Headphone amplifiers: Provides amplification for better audio quality.
3. Intercom systems: Amplifies audio signals for clear communication.
4. Alarm systems: Amplifies warning sounds for increased audibility.
5. Television and radio sets: Enhances audio output for improved listening experience.

Detailed and Complete Alternative Models

1. LM386: Similar audio amplifier IC with comparable specifications.
2. TDA7052: Audio amplifier IC with higher output power capability.
3. MAX9814: Low-noise microphone amplifier IC suitable for audio recording applications.
4. TPA3116D2: High-power audio amplifier IC for home theater systems.

These alternative models offer different features and specifications, allowing users to choose the most suitable option for their specific requirements.

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