LM386
Low Voltage Audio Power AmplifierThe LM386 is a low voltage audio power amplifier from Texas Instruments. View the full LM386 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Official LM386 datasheet (PDF) — the source this page was extracted from.
Manufacturer
Texas InstrumentsCategory
Integrated CircuitsLM386 Key Specifications
| Parameter | Value |
|---|---|
| Input | Ground-referenced |
| Output Bias | Self-centering at half the supply voltage |
| Voltage Gain | 20 to 200 |
| Load Impedance | 4 Ω to 32 Ω |
| Quiescent Power | 24 mW at 6V supply |
| Quiescent Current | 4 mA |
| Available Packages | PDIP-8 (9.60 x 6.35 mm), SOIC-8 (4.90 x 3.90 mm), VSSOP-8 (3.00 x 3.00 mm) |
| Supply Voltage Range | 4V to 12V or 5V to 18V (depending on variant) |
| Total Harmonic Distortion | 0.2% (AV = 20, VS = 6 V, RL = 8 Ω, PO = 125 mW, f = 1 kHz) |
LM386 Overview
Part: LM386 (LM386N-1/-3/-4, LM386M-1, LM386MX-1, LM386MMX-1) — Texas Instruments
Type: Low Voltage Audio Power Amplifier
Description: Low-voltage audio power amplifier with 4–12 V supply (5–18 V for LM386N-4), 4 mA typical quiescent current, internally set gain of 20 (adjustable up to 200), and 325 mW typical output power (LM386N-1/LM386M-1/LM386MM-1, VS = 6 V, RL = 8 Ω).
Operating Conditions:
- Supply voltage: 4–12 V (LM386N-4: 5–18 V)
- Operating temperature: 0 to 70 °C
- Minimum speaker impedance: 4 Ω
- Analog input voltage: -0.4 to 0.4 V
Absolute Maximum Ratings:
- Max supply voltage: 15 V (LM386N-1/-3, LM386M-1); 22 V (LM386N-4)
- Package power dissipation: 1.25 W (LM386N), 0.73 W (LM386M), 0.595 W (LM386MM-1)
- Input voltage: -0.4 to 0.4 V
- Storage temperature: -65 to 150 °C
Key Specs:
- Quiescent current: 4 mA typ, 8 mA max (VS = 6 V, VIN = 0)
- Output power: 250 mW min / 325 mW typ (VS = 6 V, RL = 8 Ω, THD = 10%, LM386N-1/LM386M-1/LM386MM-1)
- Output power: 500 mW min / 700 mW typ (VS = 9 V, RL = 8 Ω, THD = 10%, LM386N-3)
- Output power: 700 mW min / 1000 mW typ (VS = 16 V, RL = 32 Ω, THD = 10%, LM386N-4)
- Voltage gain: 26 dB typ (VS = 6 V, f = 1 kHz); 46 dB typ with 10 μF between pins 1 and 8
- Bandwidth: 300 kHz typ (VS = 6 V, pins 1 and 8 open)
- THD: 0.2% typ (VS = 6 V, RL = 8 Ω, POUT = 125 mW, f = 1 kHz)
- PSRR: 50 dB typ (VS = 6 V, f = 1 kHz, CBYPASS = 10 μF, referred to output)
- Input resistance: 50 kΩ typ; input bias current: 250 nA typ (VS = 6 V)
Features:
- Battery operation
- Minimum external parts
- Wide supply voltage range: 4–12 V or 5–18 V
- Low quiescent current drain: 4 mA
- Voltage gains from 20 to 200
- Ground-referenced input
- Self-centering output quiescent voltage
- Low distortion: 0.2%
Applications:
- AM-FM radio amplifiers
- Portable tape player amplifiers
- Intercoms
- TV sound systems
- Line drivers
- Ultrasonic drivers
- Small servo drivers
- Power converters
Package:
- PDIP (8): 9.60 mm × 6.35 mm
- SOIC (8): 4.90 mm × 3.90 mm
- VSSOP (8): 3.00 mm × 3.00 mm
LM386 Features
- Battery Operation
- Minimum External Parts
- Wide Supply Voltage Range: 4 V-12 V or 5 V-18 V
- Low Quiescent Current Drain: 4 mA
- Voltage Gains from 20 to 200
- Ground-Referenced Input
- Self-Centering Output Quiescent Voltage
- Low Distortion: 0.2% (AV = 20, VS = 6 V, RL = 8 Ω, PO = 125 mW, f = 1 kHz)
- Available in 8-Pin MSOP Package
LM386 Applications
- AM-FM Radio Amplifiers
- Portable Tape Player Amplifiers
- Intercoms
- TV Sound Systems
- Line Drivers
- Ultrasonic Drivers
- Small Servo Drivers
- Power Converters
LM386
SNAS545D - MAY 2004 - REVISED AUGUST 2023
LM386 Pin Configuration
Figure 5-1. D Package 8-Pin MSOP Top View
Table 5-1. Pin Functions
| PIN - NAME | PIN - NO. | TYPE (1) | DESCRIPTION |
|---|---|---|---|
| GAIN | 1 | - | Gain setting pin |
| -INPUT | 2 | I | Inverting input |
| +INPUT | 3 | I | Noninverting input |
| GND | 4 | P | Ground reference |
| V OUT | 5 | O | Output |
| V S | 6 | P | Power supply voltage |
| BYPASS | 7 | O | Bypass decoupling path |
| GAIN | 8 | - | Gain setting pin |
(1) I = Input, O = Output, P = Power
Table 5-1. Pin Functions
LM386 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| V S | Operating Supply Voltage | LM386N-1, -3, LM386M-1, LM386MM-1 | 4 | 12 | V | |
| V S | Operating Supply Voltage | LM386N-4 | 5 | 18 | V | |
| I Q | Quiescent Current | V S = 6 V, V IN = 0 | 4 | 8 | mA | |
| P OUT | Output Power | V S = 6 V, R L = 8 Ω, THD = 10% (LM386N-1, LM386M-1, LM386MM-1) | 250 | 325 | mW | |
| P OUT | Output Power | V S = 9 V, R L = 8 Ω, THD = 10% (LM386N-3) | 500 | 700 | mW | |
| P OUT | Output Power | V S = 16 V, R L = 32 Ω, THD = 10% (LM386N-4) | 700 | 1000 | mW | |
| A V | Voltage Gain | V S = 6 V, f = 1 kHz | 26 | dB | ||
| A V | Voltage Gain | 10 μF from Pin 1 to 8 | 46 | dB | ||
| BW | Bandwidth | V S = 6 V, Pins 1 and 8 Open | 300 | kHz | ||
| THD | Total Harmonic Distortion | V S = 6 V, R L = 8 Ω, POUT = 125mW f = 1 kHz, Pins 1 and 8 Open | 0.2% | |||
| PSRR | Power Supply Rejection Ratio | V S = 6 V, f = 1 kHz, CBYPASS = 10 μF Pins 1 and 8 Open, Referred to Output | 50 | dB | ||
| R IN | Input Resistance | 50 | kΩ | |||
| I BIAS | Input Bias Current | V S = 6 V, Pins 2 and 3 Open | 250 | nA |
LM386 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Supply Voltage, V CC | LM386N-1/-3, LM386M-1 | 15 | V | |
| Supply Voltage, V CC | LM386N-4 | 22 | V | |
| Package | LM386N | 1.25 | W | |
| Package | LM386M | 0.73 | W | |
| Package | LM386MM-1 | 0.595 | W | |
| Input Voltage, V I | Input Voltage, V I | -0.4 | 0.4 | V |
| Storage temperature, T stg | Storage temperature, T stg | -65 | 150 | °C |
LM386 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| V CC | Supply Voltage | 4 | 12 | V | |
| V CC | LM386N-4 | 5 | 18 | V | |
| Speaker Impedance | 4 | Ω | |||
| VI | Analog input voltage | -0.4 | 0.4 | V | |
| TA | Operating free-air temperature | 0 | 70 | °C |
LM386 Thermal Information
| THERMAL METRIC (1) | LM386 D (SOIC) - 8 | LM386 DGK (VSSOP) - 8 | LM386 P (PDIP) - 8 | UNIT | |
|---|---|---|---|---|---|
| R θJA | Junction-to-ambient thermal resistance | 115.7 | 169.3 | 53.4 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 59.7 | 73.1 | 42.1 | °C/W |
| R θJB | Junction-to-board thermal resistance | 56.2 | 100.2 | 30.6 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 12.4 | 9.2 | 19.0 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 55.6 | 99.1 | 50.5 | °C/W |
LM386 Typical Application
Below are shown different setups that show how the LM386 can be implemented in a variety of applications.
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