component
NS4251
Public Made by Adomby adom
Shenzhen Nsiway Tech Audio Amplifiers, QFN-16-EP(3x3). Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownNS4251
Shenzhen Nsiway Tech · Audio Amplifiers · QFN-16-EP(3x3)
NS4251 from Shenzhen Nsiway Tech, in a QFN-16-EP(3x3). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VOPB | output | Right channel positive audio output for bridged speaker mode or right headphone output in single-ended mode. |
| 2 | HP-IN | input | Headphone mode control input with VIL=0.4V selecting bridged output and VIH=1.4V selecting single-ended headphone output. |
| 3 | SD | input | Shutdown control input (active high) with shutdown current of 1-10µA when enabled; design with pull-up to ensure shutdown during floating or high-impedance conditions. |
| 4 | VOPA | output | Left channel positive audio output for bridged speaker mode or left headphone output in single-ended mode. |
| 5 | GND | power_in | Power ground reference. |
| 6 | VDD | power_in | Power supply input rated 3.0V to 5.5V with bypass capacitor (10µF electrolytic |
| 7 | VONA | output | Left channel negative audio output providing signal return for bridged speaker output. |
| 8 | INNA | input | Left channel input signal (negative terminal) AC-coupled through capacitor Ci (0.1µF-0.39µF) and resistor Ri setting gain Av=240k/Rin. |
| 9 | GND | power_in | Power ground reference. |
| 10 | /3D | input | 3D surround stereo function control input (active low); low level enables 3D processing, high level disables it. |
| 11 | VREF | power_in | Reference voltage bypass pin requiring 1µF capacitor to ground for quiescent point stabilization and pop noise reduction. |
| 12 | AB/D | input | Class AB/D mode control input (cannot float); low level enables Class AB mode, high level enables Class D mode with 350kHz PWM frequency. |
| 13 | INNB | input | Right channel input signal (negative terminal) AC-coupled through capacitor Ci (0.1µF-0.39µF) and resistor Ri setting gain Av=240k/Rin. |
| 14 | VONB | output | Channel negative audio output (datasheet labels as left channel but naming convention suggests right channel B); provides signal return for output stage. |
| 15 | VDD | power_in | Power supply input rated 3.0V to 5.5V with bypass capacitor (10µF electrolytic |
| 16 | GND | power_in | Power ground reference. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Nsiway Tech |
| Package | QFN-16-EP(3x3) |
| Category | Amplifiers/Comparators |
| Pins | 17 |
CAD (KiCad official)
- Symbol:
NS4251 - Footprint:
Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm - 3D model: QFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files:
ns4251-etched.step/ns4251-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ns4251.step/ns4251.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shenzhen Nsiway Tech datasheet (12 pp, sha256
eb0cd92f2be3a786, retrieved 2026-09-22, 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 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).