# NS4871

**Shenzhen Nsiway Tech** · Audio Amplifiers · SOP-8-EP

NS4871 from Shenzhen Nsiway Tech, in a SOP-8-EP. 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 | SD | input | Shutdown control pin: a high level puts the amplifier into shutdown and a low level enables it, and the control level must meet the interface requirements (VIH 1.5 V / VIL 1.3 V at 5 V supply; VIH 1.3 V / VIL 1.0 V at 3 V supply). |
| 2 | Bypass | passive | Internal common-mode voltage bypass pin, where an external capacitor CB (typically 0.1 uF to 1 uF ceramic) affects PSRR and switching noise. |
| 3 | +IN | input | Non-inverting analog input of the amplifier, with gain set by the external resistors Ri and Rf (Av = 2 x Rf / Ri). |
| 4 | -IN | input | Inverting analog input of the amplifier, with gain set by the external resistors Ri and Rf (Av = 2 x Rf / Ri). |
| 5 | VO1 | output | Analog output 1 of the BTL bridge output, driving one side of the load. |
| 6 | VDD | power_in | Positive power supply, specified at 3.0 V to 5.25 V with input voltage limited to -0.3 V to VDD. |
| 7 | GND | power_in | Power supply ground. |
| 8 | VO2 | output | Analog output 2 of the BTL bridge output, driving the other side of the load in inverted phase to VO1. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Nsiway Tech |
| Package | SOP-8-EP |
| Category | Amplifiers/Comparators |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Power supply voltage range (limiting parameters) |  | 2.8 |  | 5.5 | V |  | 2 |
| Power supply voltage | VDD | 3 |  | 5.25 | V |  | 4 |
| Input voltage range (max is VDD) |  | -0.3 |  |  | V |  | 2 |
| ESD voltage, human body model |  |  |  | 3000 | V | HBM | 2 |
| ESD voltage, machine model |  |  |  | 250 | V | MM | 2 |
| Operating temperature range |  | -40 |  | 85 | ℃ |  | 2 |
| Storage temperature range |  | -65 |  | 150 | ℃ |  | 2 |
| Maximum junction temperature |  |  |  | 150 | ℃ |  | 2 |
| Soldering temperature |  |  |  | 220 | ℃ | 10 s | 2 |
| Quiescent supply current | IDD |  | 6 | 10 | mA | VIN=0V, Io=0A | 4 |
| Shutdown leakage current | ISD |  | 1 | 20 | µA |  | 4 |
| Output offset voltage | VOS |  | 5.7 | 50 | mV |  | 4 |
| Output resistance | RO | 7 | 8.5 | 10 | K |  | 4 |
| Power supply rejection ratio | PSRR | 65 | 80 |  | dB |  | 4 |
| Output power | PO |  | 2 |  | W | THD=1%, f=1kHz, RL=4Ω | 4 |
| Output power | PO |  | 1.3 |  | W | THD=1%, f=1kHz, RL=8Ω | 4 |
| Output power | PO |  | 1.7 |  | W | THD+N=10%, f=1kHz, RL=8Ω | 4 |
| Total harmonic distortion plus noise | THD+N |  | 0.1 |  | % | AVD=2, 20Hz≤f≤20kHz, RL=4Ω, PO=1W | 4 |
| Signal-to-noise ratio | SNR |  | 85 |  | dB | RL=4Ω, Po=1W | 4 |
| Shutdown input high-level voltage (VDD = 5V) | VIH |  | 1.5 |  | V | VDD=5V | 12 |
| Shutdown input low-level voltage (VDD = 5V) | VIL |  | 1.3 |  | V | VDD=5V | 12 |
| Shutdown input high-level voltage (VDD = 3V) | VIH |  | 1.3 |  | V | VDD=3V | 12 |
| Shutdown input low-level voltage (VDD = 3V) | VIL |  | 1 |  | V | VDD=3V | 12 |
| Thermal resistance, junction-to-case | θJC |  | 35 |  | °C/W |  | 2 |
| Thermal resistance, junction-to-ambient | θJA |  | 140 |  | °C/W |  | 2 |

## CAD (KiCad official)

- Symbol: `NS4871`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: SOP-8-EP (KiCad packages3D, STEP)
- 3D model files: `ns4871-etched.step` / `ns4871-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ns4871.step` / `ns4871.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shenzhen Nsiway Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893275076382720) (14 pp, sha256 `1a911e8bc37ac0fc`, retrieved 2026-10-09, 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/ns4871-datasheet.pdf)