# BSS138-TP

**MCC Micro Commercial Components** · MOSFETs · SOT-23

BSS138-TP from MCC Micro Commercial Components, in a SOT-23. 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 | GATE | input | Gate terminal of the N-channel MOSFET; gate-source voltage is rated at ±20 V (VGS) and the threshold is 0.8 V min to 1.5 V typ at VDS=VGS, ID=1 mA. |
| 2 | SOURCE | passive | Source terminal of the N-channel MOSFET; drain current is rated at 0.22 A continuous with a maximum drain-source voltage of 50 V. |
| 3 | DRAIN | passive | Drain terminal of the N-channel MOSFET; drain-source breakdown voltage is 50 V min at VGS=0 V, ID=250 µA, with total power dissipation PD of 0.35 W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MCC Micro Commercial Components |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| 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 |
|---|---|---|---|---|---|---|---|
| Drain-Source Breakdown Voltage | V(BR)DSS | 50 |  |  | V | VGS=0V, ID=250µA | 2 |
| Gate-Threshold Voltage | VGS(th) | 0.8 |  | 1.5 | V | VDS=VGS, ID=1mA | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±20V, VDS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 100 | nA | VDS=50V, VGS=0V | 2 |
| Drain-Source On-Resistance | RDS(on) |  |  | 3.5 | Ω | VGS=10V, ID=0.22A | 2 |
| Drain-Source On-Resistance | RDS(on) |  |  | 6 | Ω | VGS=4.5V, ID=0.22A | 2 |
| Diode Forward Voltage | VSD |  |  | 1.4 | V | VGS=0V, IS=0.44A | 2 |
| Input Capacitance | Ciss |  |  | 60 | pF | VDS=25V, VGS=0V, f=1MHz | 2 |
| Output Capacitance | Coss |  |  | 20 | pF | VDS=25V, VGS=0V, f=1MHz | 2 |
| Reverse Transfer Capacitance | Crss |  |  | 15 | pF | VDS=25V, VGS=0V, f=1MHz | 2 |
| Drain-Source Voltage | VDS |  |  | 50 | V |  | 1 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 1 |
| Drain Current-Continuous | ID |  |  | 0.22 | A |  | 1 |
| Power Dissipation | PD |  |  | 0.35 | W |  | 1 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | °C |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 1 |
| Thermal Resistance Junction to Ambient | RθJA |  | 357 |  | °C/W | Junction to ambient | 1 |

## CAD (KiCad official)

- Symbol: `BSS138-TP`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bss138-tp-etched.step` / `bss138-tp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bss138-tp.step` / `bss138-tp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MCC Micro Commercial Components datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588907531648815104) (4 pp, sha256 `8ee3ad4d5a3430ce`, 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/bss138-tp-datasheet.pdf)