# COS8221BRZ

**COSINE** · Instrumentation Amplifiers · SOP-8

COS8221BRZ from COSINE, in a SOP-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 | VIN- | power_in | Negative input |
| 2 | RG | passive | Gain setting pin. For gains greater than 1, place a gain resistor between pin 2 & 3 |
| 3 | RG | passive | Gain setting pin. For gains greater than 1, place a gain resistor between pin 2 & 3 |
| 4 | VIN+ | power_in | Positive input |
| 5 | -VS | power_in | Negative supply |
| 6 | REF | input | Reference input. This Pin must be driven by low impedance or connected to ground |
| 7 | VOUT | output | Output |
| 8 | +VS | power_in | Positive supply |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `COS8221BRZ`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `cos8221brz-etched.step` / `cos8221brz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cos8221brz.step` / `cos8221brz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [COSINE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603168894580371456) (8 pp, sha256 `0e71b764a438c162`, retrieved 2026-09-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-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).

[Datasheet PDF](docs/cos8221brz-datasheet.pdf)