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LM386BM-1

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HGSEMI Audio Amplifiers, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM386BM-1

HGSEMI · Audio Amplifiers · SOP-8

LM386BM-1 from HGSEMI, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 GAIN passive Gain-control pin: with pins 1 and 8 open the internal 1.35k resistor sets a voltage gain of 20 (26 dB), and a capacitor between pins 1 and 8 raises the gain to 200 (46 dB) while a series R-C between them gives any gain from 20 to 200.
2 IN- input Inverting input, referenced to ground through an internal 50k resistor, with input bias current of about 250 nA; the unused input must be bypassed to ground when operating at high gain to avoid gain loss or instability.
3 IN+ input Non-inverting input, referenced to ground through an internal 50k resistor, with input bias current of about 250 nA; the unused input must be bypassed to ground when operating at high gain to avoid gain loss or instability.
4 GND power_in Ground reference pin for the device, to which the inputs are referenced.
5 VOUT output Amplifier output, automatically biased to half the supply voltage, which drives the 8 Ω load (output power 250 mW min at Vcc=6 V and 500 mW min at Vcc=9 V at 10% THD).
6 Vs power_in Supply pin, operating range 4 V to 12 V, with an absolute maximum supply voltage of 15 V.
7 BYPASS passive Bypass pin whose external capacitor (10 µF in the datasheet test conditions) sets the supply ripple rejection (PSRR 50 dB typ at 1 kHz).
8 GAIN passive Gain-control pin paired with pin 1: with both pins open the gain is 20 (26 dB), and a capacitor between pins 1 and 8 bypasses the 1.35k resistor to raise the gain to 200 (46 dB).

Key specifications

Parameter Value
Manufacturer HGSEMI
Package SOP-8
Category Amplifiers/Comparators
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Operating supply voltage Vcc 4 12 V 4
Static supply current Icc 4 8 mA Vcc=6V, VIN=0 4
Output power Po 250 325 mW Vcc=6V, RL=8Ω, THD=10% 4
Output power Po 500 700 mW Vcc=9V, RL=8Ω, THD=10% 4
Max input voltage VIN -0.4 0.4 V 3
Supply voltage Vcc 15 V 3
Maximum allowable power dissipation PD 660 mW 3
Soldering temperature Ts 260 ℃ 10 s 3
Junction temperature Tj 150 ℃ 3
Operating temperature Tamb 0 70 ℃ 3
Storage temperature Tstg -40 125 ℃ 3
Voltage gain Av 26 dB Vcc=6V, f=1kHz, pins 1 and 8 open 4
Voltage gain with 10μF between pins 1 and 8 Av 46 dB Vcc=6V, f=1kHz, 10μF capacitor between pins 1 and 8 4
Bandwidth BW 300 kHz Vcc=6V, pins 1 and 8 open 4
Total harmonic distortion THD 0.2 % Vcc=6V, RL=8Ω, Po=125mW, f=1kHz, pins 1 and 8 open 4
Power supply ripple rejection ratio PSRR 50 dB Vcc=6V, f=1kHz, CBYPASS=10μF, pins 1 and 8 open, output referenced 4
Input resistance RIN 50 kΩ 4
Input bias current IB 250 nA Vcc=6V, pins 2 and 3 open 4

CAD (KiCad official)

  • Symbol: LM386BM-1
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: lm386bm-1-etched.step / lm386bm-1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm386bm-1.step / lm386bm-1.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: HGSEMI datasheet (10 pp, sha256 3500d8afa6a2f178, retrieved 2026-10-18, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF