component
BY255
Public Made by Adomby adom
SUNMATE Elec Diodes - General Purpose, DO-201AD. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
BY255
SUNMATE Elec · Diodes - General Purpose · DO-201AD
BY255 from SUNMATE Elec, in a DO-201AD. 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 | K | passive | Cathode, marked by the cathode band on the DO-201AD molded plastic case; BY255 has VRRM/VRSM of 1300 V and IFAV of 3 A at TA = 50°C. |
| 2 | A | passive | Anode, the lead opposite the cathode band on the axial DO-201AD case; forward voltage VF < 1.1 V at IF = 3 A, Tj = 25°C. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SUNMATE Elec |
| Package | DO-201AD |
| Category | Diodes |
| Pins | 2 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Repetitive peak reverse voltage | VRRM | 1300 | V | BY255 | 1 | ||
| Surge peak reverse voltage | VRSM | 1300 | V | BY255 | 1 | ||
| Max. average forward rectified current, R-load | IFAV | 3 | A | TA = 50°C | 1 | ||
| Repetitive peak forward current | IFRM | 20 | A | f > 15 Hz | 1 | ||
| Peak forward surge current, 50/60 Hz half sine-wave | IFSM | 100 | A | TA = 25°C, 50 Hz (110 A at 60 Hz) | 1 | ||
| Rating for fusing | i2t | 50 | A2s | t < 10 ms, TA = 25°C | 1 | ||
| Junction temperature | Tj | -50 | 150 | °C | 1 | ||
| Storage temperature | TS | -50 | 175 | °C | 1 | ||
| Forward voltage | VF | 1.1 | V | Tj = 25°C, IF = 3 A | 2 | ||
| Leakage current | IR | 5 | µA | Tj = 25°C, VR = VRRM | 2 | ||
| Thermal resistance junction to ambient air | RthA | 25 | K/W | 2 | |||
| Thermal resistance junction to leads | RthL | 10 | K/W | 2 | |||
| Typical junction capacitance | Cj | 20 | pF | VR = 4 V | 2 | ||
| Reverse recovery time | trr | 1500 | ns | IF = 0.5 A through IR = 1 A to IR = 0.25 A | 2 |
CAD (KiCad official)
- Symbol:
BY255 - Footprint:
Diode_THT:D_DO-201AD_P15.24mm_Horizontal - 3D model: DO-201AD (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SUNMATE Elec datasheet (2 pp, sha256
cb1fd4290d65a262, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).
# BY255
**SUNMATE Elec** · Diodes - General Purpose · DO-201AD
BY255 from SUNMATE Elec, in a DO-201AD. 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 | K | passive | Cathode, marked by the cathode band on the DO-201AD molded plastic case; BY255 has VRRM/VRSM of 1300 V and IFAV of 3 A at TA = 50°C. |
| 2 | A | passive | Anode, the lead opposite the cathode band on the axial DO-201AD case; forward voltage VF < 1.1 V at IF = 3 A, Tj = 25°C. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SUNMATE Elec |
| Package | DO-201AD |
| Category | Diodes |
| Pins | 2 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Repetitive peak reverse voltage | VRRM | | | 1300 | V | BY255 | 1 |
| Surge peak reverse voltage | VRSM | | | 1300 | V | BY255 | 1 |
| Max. average forward rectified current, R-load | IFAV | | | 3 | A | TA = 50°C | 1 |
| Repetitive peak forward current | IFRM | | | 20 | A | f > 15 Hz | 1 |
| Peak forward surge current, 50/60 Hz half sine-wave | IFSM | | | 100 | A | TA = 25°C, 50 Hz (110 A at 60 Hz) | 1 |
| Rating for fusing | i2t | | | 50 | A2s | t < 10 ms, TA = 25°C | 1 |
| Junction temperature | Tj | -50 | | 150 | °C | | 1 |
| Storage temperature | TS | -50 | | 175 | °C | | 1 |
| Forward voltage | VF | | | 1.1 | V | Tj = 25°C, IF = 3 A | 2 |
| Leakage current | IR | | | 5 | µA | Tj = 25°C, VR = VRRM | 2 |
| Thermal resistance junction to ambient air | RthA | | | 25 | K/W | | 2 |
| Thermal resistance junction to leads | RthL | | | 10 | K/W | | 2 |
| Typical junction capacitance | Cj | | 20 | | pF | VR = 4 V | 2 |
| Reverse recovery time | trr | | 1500 | | ns | IF = 0.5 A through IR = 1 A to IR = 0.25 A | 2 |
## CAD (KiCad official)
- Symbol: `BY255`
- Footprint: `Diode_THT:D_DO-201AD_P15.24mm_Horizontal`
- 3D model: DO-201AD (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [SUNMATE Elec datasheet](docs/by255-datasheet.pdf) (2 pp, sha256 `cb1fd4290d65a262`, retrieved 2026-10-22, 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/by255-datasheet.pdf)