Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Topology | Single-ended low-voltage mono audio power amplifier |
| Exact -1 Supply Range | 4 V to 12 V recommended |
| Output Power | 325 mW typical at 6 V / 8 Ω / 10% THD stated for -1 grade |
| Gain | 20 internally; external R/C between pins 1 and 8 can raise gain to 200 |
| Quiescent Current | 4 mA typical |
| Input | Ground-referenced input; 50-kΩ input resistance stated |
| Distortion | 0.2% stated at 125 mW / 6 V / 8 Ω / 1 kHz condition |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large reel; 0°C to +70°C; marking LM386 M-1 |
Product Overview
LM386MX-1/NOPB is a classic battery-powered mono amplifier designed to work with very few external parts. The -1 grade specifically uses a 4–12 V recommended supply range; the 5–18 V range belongs to higher-voltage LM386 variants and must not be copied onto this exact order code.
The internal voltage gain is 20, while a capacitor/resistor network between the gain pins can increase gain up to 200. The output biases itself near half the supply, so an output coupling capacitor is normally part of the single-ended speaker path.
At 6 V into 8 Ω, the exact -1 family electrical table gives roughly 325 mW typical at 10% THD. This is a small-speaker/intercom amplifier, not a multiwatt bridge power stage.
For related devices, see HKEQGOO’s Audio Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | LM386MX-1/NOPB |
| Topology | Single-ended low-voltage mono audio power amplifier |
| Exact -1 Supply Range | 4 V to 12 V recommended |
| Output Power | 325 mW typical at 6 V / 8 Ω / 10% THD stated for -1 grade |
| Gain | 20 internally; external R/C between pins 1 and 8 can raise gain to 200 |
| Quiescent Current | 4 mA typical |
| Input | Ground-referenced input; 50-kΩ input resistance stated |
| Distortion | 0.2% stated at 125 mW / 6 V / 8 Ω / 1 kHz condition |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large reel; 0°C to +70°C; marking LM386 M-1 |
| Manufacturer Status | Active / Production |
| Part Marking | LM386 M-1 |
Functional Highlights
Gain can be changed without adding an external op-amp
Pins 1 and 8 let the same device serve low-level microphone/radio stages or higher-level line sources by changing a simple network.
Low quiescent current fits battery operation
About 4 mA typical idle current was a central design goal of the LM386 architecture.
Design Considerations
- Use 4–12 V for this exact -1 variant; do not apply the 18-V rating of other LM386 grades.
- Size the output coupling capacitor from speaker impedance and required low-frequency response.
- Keep input/bypass routing away from the high-current speaker/output path to prevent oscillation/hum.
Product Status and Exact Order Code
Texas Instruments lists LM386MX-1/NOPB as Active / Production; SOIC (D), 8 pins; 2500-piece large tape and reel; 0°C to +70°C; marking LM386 M-1.
Related Engineering Resources
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