# DK100R05ST

**Shenzhen DongKe Semicon** · DC-DC Converters · TO-220F-3

DK100R05ST from Shenzhen DongKe Semicon, in a TO-220F-3. 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 | Not connected (floating) pin. |
| 2 | K | passive | Cathode: connects in the application like the cathode of a diode, and is the reference for the NMOS turn-on voltage (VON = -220 mV typ.) with 100V maximum NMOS drain-source breakdown. |
| 3 | A | passive | Anode: connects in the application like the anode of a diode, and is the reference point for the datasheet's supply voltage thresholds (VCC_ON 7.2 V, VCC_OFF 3.3 V, VOVP 10 V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen DongKe Semicon |
| Package | TO-220F-3 |
| Category | Power Supply Chip |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| NMOS drain-source breakdown voltage | V(BR)DSS |  |  | 100 | V |  | 3 |
| NMOS max continuous current | IDSCDC |  |  | 60 | A |  | 3 |
| NMOS max peak current | IDSPDC |  |  | 200 | A |  | 3 |
| Power dissipation TO220 | PDMAX |  |  | 33 | W |  | 3 |
| Storage temperature range | TSTG | -55 |  | 155 | °C |  | 3 |
| Junction operating temperature range | TJ | -40 |  | 150 | °C |  | 3 |
| Soldering temperature |  |  |  | 260 | °C | 5 s | 3 |
| Thermal resistance junction to ambient | RθJA |  | 62.5 |  | ℃/W |  | 3 |
| Thermal resistance junction to case | RθJC |  | 3.8 |  | ℃/W |  | 3 |
| Chip start-up voltage | VCC_ON |  | 7.2 |  | V | TA = 25℃, referenced to A | 3 |
| Undervoltage protection threshold | VCC_OFF |  | 3.3 |  | V | TA = 25℃, referenced to A | 3 |
| Overvoltage protection threshold | VOVP |  | 10 |  | V | TA = 25℃, referenced to A | 3 |
| NMOS turn-on voltage | VON |  | -220 |  | mV | K pin as reference | 3 |
| NMOS turn-on delay | TDON |  | 150 |  | ns |  | 3 |
| NMOS turn-off delay | TDOFF |  | 50 |  | ns |  | 3 |
| NMOS max on-time | TON_MAX |  | 20 |  | μs |  | 3 |
| NMOS min on-time | TON_MIN |  | 200 |  | ns |  | 3 |
| NMOS min off-time | TOFF_MIN |  | 500 |  | ns |  | 3 |
| Dead time | TD |  | 400 |  | ns | auto-adjusted from K pin fluctuation | 3 |
| Max operating frequency | FS_MAX |  | 150 |  | KHz |  | 3 |
| NMOS on-resistance | RDS_ON |  | 5 |  | mΩ |  | 3 |

## CAD (KiCad official)

- Symbol: `DK100R05ST`
- Footprint: `Package_TO_SOT_THT:TO-220F-3_Vertical`
- 3D model: TO-220F-3 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Shenzhen DongKe Semicon datasheet](docs/dk100r05st-datasheet.pdf) (7 pp, sha256 `1928d7f03cb30a24`, retrieved 2026-10-23, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/dk100r05st-datasheet.pdf)