LM386MM-1

Audio Amplifiers Overview

The LM386MM-1 is a low voltage audio power amplifier manufactured by Texas Instruments, originally designed by National Semiconductor. It operates on a single power supply ranging from 4V to 12V with a maximum of 12V for this specific variant. The device delivers an output power of 325mW into a 4-ohm load. It features a default fixed voltage gain of 20 (26dB), which can be increased to 200 (46dB) via external components. The amplifier utilizes a Class-AB push-pull output stage and draws a typical quiescent current of 4mA. It is housed in an 8-pin VSSOP surface-mount package.

Audio Amplifiers Feature Summary

• Integrates a complete AB-class push-pull output stage within a compact surface-mount package
• Features internally set fixed voltage gain of 20x with provision for external adjustment up to 200x
• Operates directly from a single low-voltage battery supply without requiring complex biasing circuits
• Includes automatic midpoint biasing at the output to eliminate the need for large coupling capacitors

Audio Amplifiers Applications

• AM/FM radio amplifiers
• Portable tape players
• Intercom systems
• Television sound systems
• Line drivers

Audio Amplifiers Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the suffix MM indicates the VSSOP-8 surface-mount package rather than the standard DIP or TO-92 variants. Confirm the -1 suffix corresponds to the 325mW power rating and 12V maximum supply limit, distinct from higher-power N-3 or N-4 versions. Check RoHS compliance status if required for modern assembly lines.

Audio Amplifiers Selection Notes

Select this component when space constraints necessitate a surface-mount solution over traditional through-hole packages. The LM386MM-1 is suitable for applications requiring moderate audio output power driven by low-voltage batteries. Consider the thermal performance of the VSSOP package for enclosed designs. Verify that the 4mA quiescent current aligns with the system's power budget requirements.

Audio Amplifiers Part Context

The LM386 series is a legacy audio amplifier family introduced in the mid-1970s by National Semiconductor. It remains in production under Texas Instruments following their acquisition of National Semiconductor. The LM386MM-1 represents the surface-mount version of the original through-hole design, maintaining pin compatibility and electrical characteristics while adapting to modern PCB assembly techniques.

Audio Amplifiers Replacement Considerations

Compatible alternatives include the NJM2113 from New Japan Radio and the AZ386 from BCD Semiconductor. Unisonic Technologies offers the LM386 in various packages. Verify pinout and electrical specifications before substitution.