# COS721SR

**COSINE** · Operational Amplifier · SOIC-8

COS721SR from COSINE, in a SOIC-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 | NC | unconnected | No connection. Leave floating or tie to ground; not electrically connected inside the package. |
| 2 | -IN | input | Inverting input of the amplifier. Allowable voltage range is -Vs - 0.3V to +Vs + 0.3V; input terminals are diode-clamped to the supply rails so external swings beyond 0.5V past the rails must be current-limited to 10mA. |
| 3 | +IN | input | Non-inverting input of the amplifier. Same voltage range as -IN (-Vs - 0.3V to +Vs + 0.3V). Rail-to-rail input capability with common-mode range extending from -0.1V to +Vs+0.1V. |
| 4 | -Vs | power_in | Negative power supply or ground. For single-supply operation tie to GND; for dual-supply operation connect to the negative rail (down to -2.75V). Bypass with a 0.1µF ceramic close to the pin if not directly grounded. |
| 5 | NC | unconnected | No connection. Leave floating or tie to ground; not electrically connected inside the package. |
| 6 | OUT | output | Amplifier output. Rail-to-rail output swings to within ~1mV of each rail with RL=100kΩ, ~8mV with RL=10kΩ, and ~40mV with RL=2kΩ. Short-circuit current is typically 21mA sourcing / 22mA sinking. |
| 7 | +Vs | power_in | Positive power supply, 2.5V to 5.5V single-supply (or up to +2.75V for dual-supply). Bypass with a 0.1µF ceramic capacitor placed as close as possible to the pin; a 2.2µF tantalum may be added for better performance. |
| 8 | NC | unconnected | No connection. Leave floating or tie to ground; not electrically connected inside the package. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | COSINE |
| Package | SOIC-8 |
| Category | Op-amp/Cmp |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `COS721SR`
- `COS721SRTR`

## CAD (KiCad official)

- Symbol: `COS721SR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `cos721sr-etched.step` / `cos721sr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cos721sr.step` / `cos721sr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [COSINE datasheet](docs/cos721sr-datasheet.pdf) (10 pp, sha256 `c3bf767fb360554e`, retrieved 2026-08-17, tier: lcsc)
- **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/cos721sr-datasheet.pdf)