component
BSR57
Public Made by Adomby adom
onsemi JFETs, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownBSR57
onsemi · JFETs · SOT-23-3
BSR57 from onsemi, in a SOT-23-3. 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 | output | Drain terminal with maximum drain-gate voltage of 40 V and drain-source on-voltage not exceeding 0.5 V at VGS = 0 V and ID = 10 mA. |
| 2 | Source | power_in | Source terminal providing the return path and voltage reference for the N-channel JFET. |
| 3 | Gate | input | Gate terminal with gate-source cut-off voltage range of 2.0 V to 6.0 V and maximum forward gate current rating of 50 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23-3 |
| 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 |
|---|---|---|---|---|---|---|---|
| Gate-Source Voltage (breakdown) | BVGSS | 40 | V | VDS = 0 V, IC = 1.0 A | 1 | ||
| Gate Reverse Current | IGSS | 1 | nA | VGS = 20 V, VDS = 0 V | 1 | ||
| Zero-Gate Voltage Drain Current | IDSS | 20 | 100 | mA | VDS = 15 V, VGS = 0 V | 1 | |
| Gate-Source Cut-off Voltage | VGS(off) | 2 | 6 | V | VDS = 15 V, ID = 0.5 nA | 1 | |
| Drain-Source On Voltage | VDS(on) | 0.5 | V | VGS = 0 V, ID = 10 mA | 1 | ||
| Drain-Source On Reverse | rds(on) | 40 | VGS = 0 V, ID = 1 mA | 1 | |||
| Reverse Transfer Capacitance | Crss | 5 | pF | VDS = 0 V, VGS = 10 V | 1 | ||
| Delay Time | td | 6 | ns | VDD = 10 V, VGS(on) = 0 V, ID = 10 mA, VGS(off) = 6.0 V | 1 | ||
| Rise Time | tr | 4 | ns | 1 | |||
| Turn-off Time | toff | 50 | ns | 1 | |||
| Drain-Gate Voltage | VDGO | 40 | V | 1 | |||
| Gate-Source Voltage | VGSO | -40 | V | 1 | |||
| Forward Gate Current | IGF | 50 | mA | 1 | |||
| Total Power Dissipation | Ptot | 250 | mW | Up to Tamb = 40°C | 1 | ||
| Storage Temperature Range | TSTG | -55 | 150 | °C | 1 | ||
| Junction Temperature | TJ | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
BSR57 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
bsr57-etched.step/bsr57-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bsr57.step/bsr57.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (3 pp, sha256
9b2064bcb1fbbdcb, retrieved 2026-09-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).