# KY4953C

**KY** · MOSFETs · SOP-8

KY4953C from KY, 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 | S1 | passive | Source terminal of the first P-channel MOSFET (channel 1), which is rated for a -30 V drain-source voltage and -3.8 A continuous drain current. |
| 2 | G1 | input | Gate terminal of the first P-channel MOSFET (channel 1), with gate-source voltage limited to ±20 V. |
| 3 | S2 | passive | Source terminal of the second P-channel MOSFET (channel 2), which is rated for a -30 V drain-source voltage and -3.8 A continuous drain current. |
| 4 | G2 | input | Gate terminal of the second P-channel MOSFET (channel 2), with gate-source voltage limited to ±20 V. |
| 5 | D2 | passive | Drain terminal of the second P-channel MOSFET (channel 2); pins 5 and 6 are internally common to the same drain. |
| 6 | D2 | passive | Drain terminal of the second P-channel MOSFET (channel 2); pin 6 is the second bond of the same drain as pin 5. |
| 7 | D1 | passive | Drain terminal of the first P-channel MOSFET (channel 1); pins 7 and 8 are internally common to the same drain. |
| 8 | D1 | passive | Drain terminal of the first P-channel MOSFET (channel 1); pin 8 is the second bond of the same drain as pin 7. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KY |
| Package | SOP-8 |
| Category | Transistors/Thyristors |
| 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 to Source Breakdown Voltage | VDSS | -30 |  |  | V | VGS=0V, ID=-250µA | 2 |
| Drain to Source Leakage Current | IDSS |  |  | -1 | µA | VDS=-30V, VGS=0V | 2 |
| Gate to Source Forward Leakage | IGSS | -100 |  | 100 | nA | VGS=±20V, VDS=0V | 2 |
| Drain-to-Source On-Resistance | RDS(on) |  | 66 | 87 | mΩ | VGS=-10V, ID=-3A | 2 |
| Drain-to-Source On-Resistance | RDS(on) |  | 100 | 130 | mΩ | VGS=-4.5V, ID=-2A | 2 |
| Gate Threshold Voltage | VGS(th) | -1 | -1.8 | -2 | V | VDS=VGS, ID=-250µA | 2 |
| Drain-Source Voltage | VDSS |  |  | -30 | V |  | 1 |
| Continuous Drain Current | ID |  |  | -3.8 | A |  | 1 |
| Pulsed Drain Current | IDM |  |  | -12 | A | Repetitive rating: pulse width limited by maximum junction temperature (note 1) | 1 |
| Gate-Source Voltage | VGSS | -20 |  | 20 | V |  | 1 |
| Power Dissipation | PD |  |  | 2 | W |  | 1 |
| Operating Junction and Storage Temperature Range | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Junction-to-Ambient Thermal Resistance | RθJA |  | 62.5 |  | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `KY4953C`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ky4953c-etched.step` / `ky4953c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ky4953c.step` / `ky4953c.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KY datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590236157163843584) (5 pp, sha256 `7faf7cf891ae7835`, retrieved 2026-10-18, 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/ky4953c-datasheet.pdf)