# BUK437-500A-VB

**VBsemi Elec** · MOSFETs · TO-220AB

BUK437-500A-VB from VBsemi Elec, in a TO-220AB. 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 | G | input | Gate terminal of the N-channel MOSFET; gate-source voltage is rated at ±30 V maximum, with threshold of 2 to 4 V at VDS = VGS, ID = 250 μA. |
| 2 | D | passive | Drain terminal (also connected to the tab); drain-source voltage rated at 650 V maximum at TJ max, with junction-to-case (drain) thermal resistance of 0.6 °C/W max. |
| 3 | S | passive | Source terminal of the N-channel MOSFET; body diode forward voltage is 1.5 V max at IS = 4 A, VGS = 0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | VBsemi Elec |
| Package | TO-220AB |
| Category | Triode/MOS Tube/Transistor |
| 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 |
|---|---|---|---|---|---|---|---|
| Gate-Source Threshold Voltage | VGS(th) | 2 |  | 4 | V | VDS = VGS, ID = 250 μA | 2 |
| Gate-Source Leakage | IGSS |  |  | 100 | nA | VGS = ± 20 V | 2 |
| Gate-Source Leakage | IGSS |  |  | 1 | μA | VGS = ± 30 V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | μA | VDS = 600 V, VGS = 0 V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 10 | μA | VDS = 520 V, VGS = 0 V, TJ = 125 °C | 2 |
| Diode Forward Voltage | VSD |  |  | 1.5 | V | TJ = 25 °C, IS = 4 A, VGS = 0 V | 2 |
| Maximum Junction-to-Ambient | RthJA |  |  | 63 | °C/W |  | 2 |
| Maximum Junction-to-Case (Drain) | RthJC |  |  | 0.6 | °C/W |  | 2 |
| Drain-Source Voltage | VDS |  |  | 650 | V | TC = 25 °C | 1 |
| Gate-Source Voltage | VGS | -30 |  | 30 | V | TC = 25 °C | 1 |
| Operating Junction and Storage Temperature Range | TJ, Tstg | -55 |  | 150 | °C |  | 1 |
| Soldering Recommendations (Peak Temperature) |  |  |  | 300 | °C | for 10 s, 1.6 mm from case | 1 |
| VDS Temperature Coefficient | ΔVDS/TJ |  | 0.65 |  | V/°C | Reference to 25 °C, ID = 1 mA | 2 |
| Gate Input Resistance | Rg |  | 3.5 |  | Ω | f = 1 MHz, open drain | 2 |
| Reverse Recovery Time | trr |  | 190 |  | ns | TJ = 25 °C, IF = IS = 4 A, dI/dt = 100 A/μs, VR = 400 V | 2 |
| Reverse Recovery Charge | Qrr |  | 2.3 |  | μC | TJ = 25 °C, IF = IS = 4 A, dI/dt = 100 A/μs, VR = 400 V | 2 |

## CAD (KiCad official)

- Symbol: `BUK437-500A-VB`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220AB (KiCad packages3D, STEP)
- 3D model files: `buk437-500a-vb-etched.step` / `buk437-500a-vb-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `buk437-500a-vb.step` / `buk437-500a-vb.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [VBsemi Elec datasheet](docs/buk437-500a-vb-datasheet.pdf) (8 pp, sha256 `2dd0232b45ecd82f`, retrieved 2026-11-12, tier: lcsc)
- **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/buk437-500a-vb-datasheet.pdf)