# COS4427SR

**COSINE** · Gate Drivers · SOP-8

COS4427SR from COSINE, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | NC | unconnected | No connection. |
| 2 | IN A | input | Input A is a high-impedance TTL/CMOS compatible input with 300 mV of hysteresis between the high and low thresholds (VIH 1.8 V, VIL 0.7 V). |
| 3 | GND | power_in | Ground is the device return pin, and it should have a low-impedance connection to the bias supply source return; high peak current flows out of it when the capacitive load is discharged. |
| 4 | In B | input | Input B is a high-impedance TTL/CMOS compatible input with 300 mV of hysteresis between the high and low thresholds (VIH 1.8 V, VIL 0.7 V). |
| 5 | OUT B | output | Output B is a low-impedance CMOS push-pull output; for the COS4427 it is in phase with input B. |
| 6 | VDD | power_in | VDD is the bias supply for the driver, rated for 4.5 V to 25 V with respect to the Ground pin, and should be bypassed with local ceramic capacitors (1.0 µF suggested). |
| 7 | OUT A | output | Output A is a low-impedance CMOS push-pull output; for the COS4427 it is in phase with input A. |
| 8 | NC | unconnected | No connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | COSINE |
| Package | SOP-8 |
| Category | Motor Driver ICs |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `COS4427SR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `cos4427sr-etched.step` / `cos4427sr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cos4427sr.step` / `cos4427sr.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/8588911201535332353) (8 pp, sha256 `6aa85dcb0144f439`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (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/cos4427sr-datasheet.pdf)