component
1N5228BPF
Public Made by Adomby adom
ST(Semtech) Zener Diodes, DO-35. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1N5228BPF
ST(Semtech) · Zener Diodes · DO-35
1N5228BPF from ST(Semtech), 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, marked by the cathode band; Zener voltage 3.9 V nominal (3.71 to 4.09 V) at IZT = 20 mA for the 1N5228BPF. |
| 2 | A | passive | Anode; maximum power dissipation 500 mW at Ta = 25 °C with forward voltage max 1.1 V at IF = 200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST(Semtech) |
| 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 Range | VZT | 3.71 | 3.9 | 4.09 | V | at IZT = 20 mA, tested with pulses tp = 20 ms | 2 |
| Dynamic Resistance | ZZT | 23 | Ω | at IZT = 20 mA | 2 | ||
| Dynamic Resistance | ZZK | 1900 | Ω | at IZK = 0.25 mA | 2 | ||
| Reverse Current | IR | 10 | µA | at VR = 1 V | 2 | ||
| Temp. Coefficient of Zener Voltage | TKVZ | -0.06 | %/K | printed <-0.060 | 2 | ||
| Forward Voltage | VF | 1.1 | V | at IF = 200 mA | 2 | ||
| Zener Voltage Tolerance | -5 | 5 | % | suffix B | 1 | ||
| Power Dissipation | Ptot | 500 | mW | Ta = 25℃ | 1 | ||
| Junction Temperature | Tj | 175 | ℃ | Ta = 25℃ | 1 | ||
| Storage Temperature Range | Tstg | -65 | 175 | ℃ | Ta = 25℃ | 1 | |
| Thermal Resistance Junction to Ambient | RθJA | 300 | ℃/W | leads kept at ambient temperature at a distance of 8 mm from case | 1 | ||
| Nominal Zener Voltage | VZnom | 3.9 | V | at IZT = 20 mA | 2 |
CAD (KiCad official)
- Symbol:
1N5228BPF - 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: ST(Semtech) datasheet (3 pp, sha256
ef97e3baf80e09cf, 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).
# 1N5228BPF
**ST(Semtech)** · Zener Diodes · DO-35
1N5228BPF from ST(Semtech), 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, marked by the cathode band; Zener voltage 3.9 V nominal (3.71 to 4.09 V) at IZT = 20 mA for the 1N5228BPF. |
| 2 | A | passive | Anode; maximum power dissipation 500 mW at Ta = 25 °C with forward voltage max 1.1 V at IF = 200 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST(Semtech) |
| 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 Range | VZT | 3.71 | 3.9 | 4.09 | V | at IZT = 20 mA, tested with pulses tp = 20 ms | 2 |
| Dynamic Resistance | ZZT | | | 23 | Ω | at IZT = 20 mA | 2 |
| Dynamic Resistance | ZZK | | | 1900 | Ω | at IZK = 0.25 mA | 2 |
| Reverse Current | IR | | | 10 | µA | at VR = 1 V | 2 |
| Temp. Coefficient of Zener Voltage | TKVZ | | | -0.06 | %/K | printed <-0.060 | 2 |
| Forward Voltage | VF | | | 1.1 | V | at IF = 200 mA | 2 |
| Zener Voltage Tolerance | | -5 | | 5 | % | suffix B | 1 |
| Power Dissipation | Ptot | | | 500 | mW | Ta = 25℃ | 1 |
| Junction Temperature | Tj | | | 175 | ℃ | Ta = 25℃ | 1 |
| Storage Temperature Range | Tstg | -65 | | 175 | ℃ | Ta = 25℃ | 1 |
| Thermal Resistance Junction to Ambient | RθJA | | | 300 | ℃/W | leads kept at ambient temperature at a distance of 8 mm from case | 1 |
| Nominal Zener Voltage | VZnom | | 3.9 | | V | at IZT = 20 mA | 2 |
## CAD (KiCad official)
- Symbol: `1N5228BPF`
- 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:** [ST(Semtech) datasheet](docs/1n5228bpf-datasheet.pdf) (3 pp, sha256 `ef97e3baf80e09cf`, 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/1n5228bpf-datasheet.pdf)