# COS12A12511

**COSINE** · Analog Switches / Multiplexers · MSOP-8

COS12A12511 from COSINE, in a MSOP-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 | COM | bidirectional | Common analog terminal of the SPDT switch. Bidirectional analog I/O; connects to either NC (when IN=L) or NO (when IN=H). Signal range V- to V+. |
| 2 | NC | bidirectional | Normally-closed analog terminal. Bidirectional analog I/O connected to COM when logic control IN is LOW. Signal range V- to V+. |
| 3 | GND | power_in | Ground, 0 V reference for the logic input and switch circuitry. |
| 4 | V+ | power_in | Most positive power supply. +3 V to +16 V (single supply, COS12A12511S) or +3 V to +8 V (dual supply, COS12A12511). Sets the upper analog signal rail. |
| 5 | N.C. | unconnected | No connect. Not internally connected; leave floating or tie to any convenient net. |
| 6 | IN | input | Digital logic control input selecting the switch throw. IN=LOW connects COM to NC; IN=HIGH connects COM to NO. TTL/CMOS compatible (VIL ≤ 0.8 V, VIH ≥ 2.4 V at 5 V supply). |
| 7 | V- | power_in | Most negative power supply. Used only in dual-supply applications (down to -8 V for COS12A12511); must be tied to GND for single-supply operation (COS12A12511S). |
| 8 | NO | bidirectional | Normally-open analog terminal. Bidirectional analog I/O connected to COM when logic control IN is HIGH. Signal range V- to V+. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | COSINE |
| Package | MSOP-8 |
| Category | Comm/UART |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `COS12A12511`
- `COS12A12511S`

## CAD (KiCad official)

- Symbol: `COS12A12511`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `cos12a12511-etched.step` / `cos12a12511-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cos12a12511.step` / `cos12a12511.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [COSINE datasheet](docs/cos12a12511-datasheet.pdf) (8 pp, sha256 `05ec697909749d77`, 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/cos12a12511-datasheet.pdf)