# BSP78HUMA1

**Infineon Technologies** · Power Distribution Switches · SOT-223-4

BSP78HUMA1 from Infineon Technologies, in a SOT-223-4. 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 | IN | input | Logic-level control input (Gate driver input). Drives the internal gate-driving unit through the ESD/input-protection network. Threshold V(IN(th)) typ. 1.7 V, on-state input current I(IN(on)) typ. 10 µA at V(IN) = 5 V; continuous input voltage range -0.2 V to +10 V (input current self-limited within this window). |
| 2 | Drain | power_in | Drain of the internal power N-MOSFET; connects to the load / V(bb) supply side through the load. Shared with pin 4 via the SOT-223 heat-spreader tab. Absolute max V(DS) = 42 V; drain-source clamp voltage V(DS(AZ)) = 42 V min / 55 V max at I(D) = 10 mA. |
| 3 | Source | power_in | Source of the internal N-MOSFET and common ground reference for the logic input. In a low-side switch application this pin is connected to system GND. |
| 4 | Drain | power_in | Drain (TAB). Electrically identical to pin 2; the exposed SOT-223 tab used as the primary thermal path for the drain metallisation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Infineon Technologies |
| Package | SOT-223-4 |
| Category | Power Management (PMIC) |
| Pins | 4 |

## Ordering variants

Same part, different packaging or reel option.

- `BSP78HUMA1`

## CAD (KiCad official)

- Symbol: `BSP78HUMA1`
- Footprint: `Package_TO_SOT_SMD:SOT-223`
- 3D model: SOT-223-4 (KiCad packages3D, STEP)
- 3D model files: `bsp78huma1-etched.step` / `bsp78huma1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bsp78huma1.step` / `bsp78huma1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Infineon Technologies datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588953995381915648) (11 pp, sha256 `32653603db0835ee`, 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/bsp78huma1-datasheet.pdf)