NS4165B

@@ -0,0 +1,44 @@+# NS4165B++**Shenzhen Nsiway Tech** · Audio Power OpAmps · ESOP-8++NS4165B from Shenzhen Nsiway Tech, in a ESOP-8. 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 | SD | input | Shutdown control input. High level puts the amplifier into power-down; low level enables normal operation. Internal pull-down means the part is ON when the pin is left floating. Logic thresholds: VIH ≥ 0.7·VDD, VIL ≤ 0.7 V. |+| 2 | Bypass | passive | Internal reference voltage (VDD/2) bypass node. Connect an external decoupling capacitor (typically 1 µF) to GND to stabilize the mid-rail bias and minimize pop/click noise at start-up. |+| 3 | AB/D | input | Class-AB / Class-D mode select input. High level selects Class-D operation; low level selects Class-AB. Internal pull-up defaults to Class-D when the pin is left floating. Logic thresholds: VIH ≥ 0.7·VDD, VIL ≤ 0.7 V. |+| 4 | INN | input | Inverting analog audio signal input. AC-coupled through a series input capacitor Ci and gain-setting resistor Ri. Closed-loop gain Av = 300 kΩ / Ri (internal feedback resistor 300 kΩ, ±10%). |+| 5 | VON | output | Negative BTL speaker output. Drives one terminal of the loudspeaker directly (filterless in Class-D). Delivers up to 5.4 W into 2Ω (Class-D, 10% THD, VDD=5V) together with VOP. |+| 6 | VDD | power_in | Supply voltage input. Recommended operating range 3.0 V to 5.5 V (absolute maximum 6.5 V). Bypass locally with 100 µF in parallel with a 1 µF ceramic capacitor as close to the pin as possible. |+| 7 | GND | power_in | Device ground / power return. Also serves as the thermal path together with the ESOP-8 exposed pad; connect to a solid ground plane using a star topology for the power/ground routing. |+| 8 | VOP | output | Positive BTL speaker output. Drives the opposite terminal of the loudspeaker from VON. Together the differential pair supplies up to 5.4 W into 2Ω at VDD=5V with 90% peak efficiency in Class-D mode. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shenzhen Nsiway Tech |+| Package | ESOP-8 |+| Category | Op-amp/Cmp |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `NS4165B`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Shenzhen Nsiway Tech datasheet](docs/ns4165b-datasheet.pdf) (10 pp, sha256 `ebcb3f8ca7f9c49d`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ns4165b-datasheet.pdf)

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