# LM4871N

**HGSEMI** · Audio Amplifiers · DIP-8

LM4871N from HGSEMI, in a DIP-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 | Shutdown | input | Shutdown control pin; a high level puts the amplifier into shutdown with no output, and it must be held low for normal operation and must not be left floating. |
| 2 | Bypass | passive | Internal common-mode voltage pin that requires an external 1μF bypass capacitor, with 0.1μF to 1μF ceramic recommended for this node. |
| 3 | +IN | input | Non-inverting audio input. |
| 4 | -IN | input | Inverting audio input. |
| 5 | VO1 | output | Audio output 1, one half of the BTL bridge-tied load output driving the speaker. |
| 6 | VDD | power_in | Positive power supply, specified at 1.9 V to 5.5 V with the absolute maximum rating of 6.0 V. |
| 7 | GND | power_in | Power supply ground. |
| 8 | VO2 | output | Audio output 2, the other half of the BTL bridge-tied load output driving the speaker. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | DIP-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 |
|---|---|---|---|---|---|---|---|
| Supply voltage | VDD | 1.9 |  | 5.5 | V |  | 4 |
| Operating voltage (absolute maximum) | VDD |  |  | 6 | V |  | 3 |
| Storage temperature | Tstg | -65 |  | 150 | ℃ |  | 3 |
| Input voltage |  | -0.3 |  |  | V | upper limit printed as +(0.3+VCC) | 3 |
| Junction temperature |  |  |  | 160 | ℃ |  | 3 |
| Pin temperature (soldering) | TLEAD |  |  | 260 | ℃ | soldering, 10s | 3 |
| Output offset voltage | Vos |  | 2 |  | mV |  | 4 |
| Quiescent current | IQ |  | 2 |  | mA | VDD=5V, IO=0 | 4 |
| Shutdown current | ISD |  | 0.1 |  | μA | VDD=2.5, 5.5V | 4 |
| Output power PO (THD=10%) | PO |  | 2.9 |  | W | f=1kHz, RL=4Ω, THD=10%, VDD=5V | 4 |
| Output power PO (THD=10%) | PO |  | 2 |  | W | f=1kHz, RL=4Ω, THD=10%, VDD=4.2V | 4 |
| Output power PO (THD=10%) | PO |  | 1.6 |  | W | f=1kHz, RL=4Ω, THD=10%, VDD=3.7V | 4 |
| Output power PO (THD=1%) | PO |  | 2.3 |  | W | f=1kHz, RL=4Ω, THD=1%, VDD=5V | 4 |
| Output power PO (THD=1%) | PO |  | 1.6 |  | W | f=1kHz, RL=4Ω, THD=1%, VDD=4.2V | 4 |
| Output power PO (THD=1%) | PO |  | 1.3 |  | W | f=1kHz, RL=4Ω, THD=1%, VDD=3.7V | 4 |
| Output power PO (THD=10%) | PO |  | 1.72 |  | W | f=1kHz, RL=8Ω, THD=10%, VDD=5V | 4 |
| Output power PO (THD=10%) | PO |  | 1.2 |  | W | f=1kHz, RL=8Ω, THD=10%, VDD=4.2V | 4 |
| Output power PO (THD=10%) | PO |  | 0.93 |  | W | f=1kHz, RL=8Ω, THD=10%, VDD=3.7V | 4 |
| Output power PO (THD=1%) | PO |  | 1.39 |  | W | f=1kHz, RL=8Ω, THD=1%, VDD=5V | 4 |
| Output power PO (THD=1%) | PO |  | 0.97 |  | W | f=1kHz, RL=8Ω, THD=1%, VDD=4.2V | 4 |
| Output power PO (THD=1%) | PO |  | 0.75 |  | W | f=1kHz, RL=8Ω, THD=1%, VDD=3.7V | 4 |
| Total harmonic distortion plus noise | THD+N |  | 0.23 |  | % | VDD=5V, RL=4Ω, PO=1.8W | 4 |
| Total harmonic distortion plus noise | THD+N |  | 0.08 |  | % | VDD=5V, RL=8Ω, PO=1W | 4 |
| Power supply rejection ratio | PSRR |  | 80 |  | dB | Input ac-grounded with Cin=0.47μF, VDD=5V, f=217Hz | 4 |
| Power supply rejection ratio | PSRR |  | 70 |  | dB | Input ac-grounded with Cin=0.47μF, VDD=5V, f=20kHz | 4 |
| Output noise voltage | Vn |  | 35 |  | μV | Input ac-grounded with Cin=0.47μF, VDD=5V | 4 |
| Signal-to-noise ratio | SNR |  | 98 |  | dB | VDD=5V, f=1kHz, THD=1% | 4 |
| Shutdown pin high-level input voltage | VSD_H |  | 0.8 |  | V | VDD=5V | 4 |
| Shutdown pin low-level input voltage | VSD_L |  | 0.5 |  | V | VDD=5V | 4 |
| Wake-up time | TWU |  | 200 |  | ms |  | 4 |

## CAD (KiCad official)

- Symbol: `LM4871N`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `lm4871n-etched.step` / `lm4871n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4871n.step` / `lm4871n.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HGSEMI datasheet](docs/lm4871n-datasheet.pdf) (14 pp, sha256 `a25a10a33327c2dd`, retrieved 2026-10-17, 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](docs/lm4871n-datasheet.pdf)