# CMS8447B

**Cmos** · MOSFETs · SOP-8

CMS8447B from Cmos, 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 | S | passive | Source of the N-channel MOSFET (pin 1, marked by the Pin 1 arrow); VDS max 40V, ID 11A continuous at TC=25℃. |
| 2 | S | passive | Source of the N-channel MOSFET, connected in parallel with the other source pins; ID 11A continuous, 33A pulsed. |
| 3 | S | passive | Source of the N-channel MOSFET, connected in parallel with the other source pins; ID 11A continuous, 33A pulsed. |
| 4 | G | input | Gate of the N-channel MOSFET; VGS max ±20V, RDS(on) max 23mΩ at VGS=10V and 27mΩ at VGS=4.5V. |
| 5 | D | passive | Drain of the N-channel MOSFET; VDS max 40V, connected with the other drain pins. |
| 6 | D | passive | Drain of the N-channel MOSFET; VDS max 40V, connected with the other drain pins. |
| 7 | D | passive | Drain of the N-channel MOSFET; VDS max 40V, connected with the other drain pins. |
| 8 | D | passive | Drain of the N-channel MOSFET; VDS max 40V, connected with the other drain pins. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Cmos |
| Package | SOP-8 |
| Category | Triode/MOS Tube/Transistor |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Drain-Source Voltage | VDS |  |  | 40 | V |  | 1 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 11 | A | TC=25℃ | 1 |
| Pulsed Drain Current | IDM |  |  | 33 | A |  | 1 |
| Total Power Dissipation | PD |  |  | 2.5 | W | TC=25℃ | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance Junction-ambient | RθJA |  |  | 50 | ℃/W |  | 1 |
| Thermal Resistance Junction-Lead | RθJL |  |  | 20 | ℃/W |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | 40 |  |  | V | VGS=0V, ID=250uA | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  |  | 23 | mΩ | VGS=10V, ID=11A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  |  | 27 | mΩ | VGS=4.5V, ID=8A | 2 |
| Gate Threshold Voltage | VGS(th) | 1 |  | 3 | V | VGS=VDS, ID=250uA | 2 |
| Drain-Source Leakage Current | IDSS |  |  | 1 | uA | VDS=32V, VGS=0V | 2 |
| Gate-Source Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±20V, VDS=0V | 2 |
| Diode Forward Voltage | VSD |  |  | 1.2 | V | VGS=0V, IS=3A | 2 |

## CAD (KiCad official)

- Symbol: `CMS8447B`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `cms8447b-etched.step` / `cms8447b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cms8447b.step` / `cms8447b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Cmos datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590457050187792384) (2 pp, sha256 `f1ba0617e8dd3e38`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/cms8447b-datasheet.pdf)