# BSR58

**onsemi** · JFETs · SOT-23

BSR58 from onsemi, in a SOT-23. 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 | Drain | passive | Drain terminal; maximum drain-gate voltage 40V, zero-gate drain current 8-80mA at VDS=15V VGS=0V, on-state drain-source voltage 0.4V typ at ID=5mA. |
| 2 | Source | passive | Source terminal; provides return path for drain current and serves as reference electrode for gate-source voltage measurements. |
| 3 | Gate | input | Gate control terminal; gate-source voltage ±40V maximum, gate-source cut-off voltage 0.8-4V at VDS=15V ID=0.5nA, maximum forward gate current 50mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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-Gate Voltage | VDGO |  |  | 40 | V |  | 2 |
| Gate-Source Voltage | VGSO | -40 |  |  | V |  | 2 |
| Forward Gate Current | IGF |  |  | 50 | mA |  | 2 |
| Total Power Dissipation | Ptot |  |  | 250 | mW | up to Tamb=40°C | 2 |
| Storage Temperature Range | TSTG | -55 |  | 150 | °C |  | 2 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 2 |
| Gate-Source Voltage | BVGSS | 40 |  |  | V | VDS = 0V, IC = 1µA | 2 |
| Gate Reverse Current | IGSS |  |  | 1 | nA | VGS = 20V | 2 |
| Zero-Gate Voltage Drain Current | IDSS | 8 |  | 80 | mA | VDS = 15V, VGS = 0V | 2 |
| Gate-Source Cut-off Voltage | VGS(off) | 0.8 |  | 4 | V | VDS = 15V, ID = 0.5nA | 2 |
| Drain-Source On Voltage | VDS(on) |  |  | 0.4 | V | VGS = 0V, ID = 5mA | 2 |
| Drain-Source On Reverse | rds(on) |  |  | 60 | Ω | VGS = 0V, ID = 0 | 2 |
| Reverse Transfer Capacitance | Crss |  |  | 5 | pF | VDS = 0V, VGS = 10V | 2 |
| Delay Time | td |  |  | 10 | nS | VDD = 10V, VGS(on) = 0V, ID = 10mA, VGS(off) = 10V | 2 |
| Rise Time | tr |  |  | 10 | nS |  | 2 |
| Turn-off Time | toff |  |  | 100 | nS |  | 2 |

## CAD (KiCad official)

- Symbol: `BSR58`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bsr58-etched.step` / `bsr58-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bsr58.step` / `bsr58.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586180906667556864) (5 pp, sha256 `1b2654931ab27882`, retrieved 2026-09-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/bsr58-datasheet.pdf)