component
1N5251BTR
Public Made by Adomby adom
onsemi Zener Diodes, DO-35. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
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1N5251BTR
onsemi · Zener Diodes · DO-35
1N5251BTR from onsemi, in a DO-35. 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | DO-35 |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage | VZ | 20.9 | 22 | 23.1 | V | @ IZ = 5.6 mA, TA = 25°C | 2 |
| Dynamic (Zener) Impedance | ZZ | 29 | Ω | @ IZ = 5.6 mA | 2 | ||
| Knee Zener Impedance | ZZK | 600 | Ω | @ IZK = 0.25 mA | 2 | ||
| Reverse Current | IR | 0.1 | µA | @ VR = 17.0 V | 2 | ||
| Forward Voltage | VF | 1.2 | V | IF = 200 mA | 2 | ||
| Power Dissipation | PD | 500 | mW | TA = 25°C | 1 | ||
| Power Derating | 4 | mW/°C | Derate above 50°C | 1 | |||
| Storage Temperature Range | TSTG | -65 | 200 | °C | 1 | ||
| Operating Junction Temperature Range | TJ | -65 | 200 | °C | 1 | ||
| Lead Temperature | 230 | °C | 1/16 inch from case for 10s | 1 | |||
| Temperature Coefficient of Zener Voltage | TC | 0.087 | %/°C | 2 |
CAD (KiCad official)
- Symbol:
1N5251BTR - Footprint:
Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal - 3D model: DO-35 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
bdf53f985b1ef2f0, retrieved 2026-10-26, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).
# 1N5251BTR
**onsemi** · Zener Diodes · DO-35
1N5251BTR from onsemi, in a DO-35. 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | DO-35 |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage | VZ | 20.9 | 22 | 23.1 | V | @ IZ = 5.6 mA, TA = 25°C | 2 |
| Dynamic (Zener) Impedance | ZZ | | | 29 | Ω | @ IZ = 5.6 mA | 2 |
| Knee Zener Impedance | ZZK | | | 600 | Ω | @ IZK = 0.25 mA | 2 |
| Reverse Current | IR | | | 0.1 | µA | @ VR = 17.0 V | 2 |
| Forward Voltage | VF | | | 1.2 | V | IF = 200 mA | 2 |
| Power Dissipation | PD | | | 500 | mW | TA = 25°C | 1 |
| Power Derating | | | | 4 | mW/°C | Derate above 50°C | 1 |
| Storage Temperature Range | TSTG | -65 | | 200 | °C | | 1 |
| Operating Junction Temperature Range | TJ | -65 | | 200 | °C | | 1 |
| Lead Temperature | | | | 230 | °C | 1/16 inch from case for 10s | 1 |
| Temperature Coefficient of Zener Voltage | TC | | 0.087 | | %/°C | | 2 |
## CAD (KiCad official)
- Symbol: `1N5251BTR`
- Footprint: `Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal`
- 3D model: DO-35 (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/1n5251btr-d.pdf) (6 pp, sha256 `bdf53f985b1ef2f0`, retrieved 2026-10-26, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/1n5251btr-datasheet.pdf)