# BFP 181 E7764

**Infineon Technologies** · Bipolar (BJT) · SOT-143

BFP 181 E7764 from Infineon Technologies, in a SOT-143. 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 | C | passive | Collector of the NPN RF transistor; the datasheet gives maximum collector-emitter voltage VCEO 12 V and collector current IC 20 mA, and Ts is measured on this lead at the solder point. |
| 2 | E | passive | Emitter of the transistor, connected to the package emitter terminal; the datasheet specifies no separate pin-level limit for this lead. |
| 3 | B | input | Base of the transistor; the datasheet gives maximum base current IB 2 mA and emitter-base voltage VEBO 2 V. |
| 4 | E | passive | Second emitter terminal, internally common with pin 2; the datasheet specifies no separate pin-level limit for this lead. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Infineon Technologies |
| Package | SOT-143 |
| Category | Transistors/Thyristors |
| Pins | 4 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-emitter voltage | VCEO |  |  | 12 | V |  | 1 |
| Collector-emitter voltage | VCES |  |  | 20 |  |  | 1 |
| Collector-base voltage | VCBO |  |  | 20 |  |  | 1 |
| Emitter-base voltage | VEBO |  |  | 2 |  |  | 1 |
| Collector current | IC |  |  | 20 | mA |  | 1 |
| Base current | IB |  |  | 2 |  |  | 1 |
| Total power dissipation | Ptot |  |  | 175 | mW | TS ≤ 75 °C | 1 |
| Junction temperature | TJ |  |  | 150 | °C |  | 1 |
| Storage temperature | TStg | -55 |  | 150 |  |  | 1 |
| Junction - soldering point thermal resistance | RthJS |  |  | 430 | K/W | Junction to soldering point; TS measured on collector lead | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 12 |  |  | V | IC = 1 mA, IB = 0 | 2 |
| Collector-emitter cutoff current | ICES |  |  | 100 | µA | VCE = 20 V, VBE = 0 | 2 |
| Collector-base cutoff current | ICBO |  |  | 100 | nA | VCB = 10 V, IE = 0 | 2 |
| Emitter-base cutoff current | IEBO |  |  | 1 | µA | VEB = 1 V, IC = 0 | 2 |
| DC current gain | hFE | 70 | 100 | 140 |  | IC = 5 mA, VCE = 8 V, pulse measured | 2 |
| Transition frequency | fT | 6 | 8 |  | GHz | IC = 10 mA, VCE = 8 V, f = 500 MHz | 3 |
| Collector-base capacitance | Ccb |  | 0.19 | 0.4 | pF | VCB = 10 V, f = 1 MHz, VBE = 0, emitter grounded | 3 |

## CAD (KiCad official)

- Symbol: `BFP 181 E7764`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `bfp-181-e7764-etched.step` / `bfp-181-e7764-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bfp-181-e7764.step` / `bfp-181-e7764.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/8588912285842878464) (6 pp, sha256 `d182b32a72d77154`, retrieved 2026-10-21, 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/bfp-181-e7764-datasheet.pdf)