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1N5247B
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ST(Semtech) Zener Diodes, DO-35. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1N5247B
ST(Semtech) · Zener Diodes · DO-35
1N5247B 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 on the DO-35 glass case; the Zener voltage is regulated with this terminal positive (1N5247B VZnom 17 V, 16.15 to 17.85 V at IZT 7.4 mA). |
| 2 | A | passive | Anode, the lead opposite the cathode band on the DO-35 glass case; 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 (min/max) | VZT | 16.15 | 17 | 17.85 | V | at IZT = 7.4 mA, tested with pulses tp = 20 ms | 2 |
| Zener Voltage tolerance | -5 | 5 | % | suffix B | 1 | ||
| Dynamic Resistance | ZZT | 19 | Ω | at IZT = 7.4 mA | 2 | ||
| Dynamic Resistance | ZZK | 600 | Ω | at IZK = 0.25 mA | 2 | ||
| Reverse Current | IR | 0.1 | µA | at VR = 13 V | 2 | ||
| Forward Voltage | VF | 1.1 | V | at IF = 200 mA | 1 | ||
| Thermal Resistance Junction to Ambient Air | RθJA | 0.3 | K/mW | leads kept at ambient temperature at 8 mm from case | 1 | ||
| Temp. Coefficient of Zener Voltage | TKVZ | 0.084 | %/K | printed <+0.084 | 2 | ||
| Power Dissipation | Ptot | 500 | mW | Ta = 25 °C, leads at ambient temperature at 8 mm from case | 1 | ||
| Junction Temperature | Tj | 200 | °C | Ta = 25 °C | 1 | ||
| Storage Temperature Range | Tstg | -65 | 200 | °C | Ta = 25 °C | 1 |
CAD (KiCad official)
- Symbol:
1N5247B - 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
31e7ca5738ce26b3, retrieved 2026-10-26, tier: manufacturer) - 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).
# 1N5247B
**ST(Semtech)** · Zener Diodes · DO-35
1N5247B 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 on the DO-35 glass case; the Zener voltage is regulated with this terminal positive (1N5247B VZnom 17 V, 16.15 to 17.85 V at IZT 7.4 mA). |
| 2 | A | passive | Anode, the lead opposite the cathode band on the DO-35 glass case; 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 (min/max) | VZT | 16.15 | 17 | 17.85 | V | at IZT = 7.4 mA, tested with pulses tp = 20 ms | 2 |
| Zener Voltage tolerance | | -5 | | 5 | % | suffix B | 1 |
| Dynamic Resistance | ZZT | | | 19 | Ω | at IZT = 7.4 mA | 2 |
| Dynamic Resistance | ZZK | | | 600 | Ω | at IZK = 0.25 mA | 2 |
| Reverse Current | IR | | | 0.1 | µA | at VR = 13 V | 2 |
| Forward Voltage | VF | | | 1.1 | V | at IF = 200 mA | 1 |
| Thermal Resistance Junction to Ambient Air | RθJA | | | 0.3 | K/mW | leads kept at ambient temperature at 8 mm from case | 1 |
| Temp. Coefficient of Zener Voltage | TKVZ | | | 0.084 | %/K | printed <+0.084 | 2 |
| Power Dissipation | Ptot | | | 500 | mW | Ta = 25 °C, leads at ambient temperature at 8 mm from case | 1 |
| Junction Temperature | Tj | | | 200 | °C | Ta = 25 °C | 1 |
| Storage Temperature Range | Tstg | -65 | | 200 | °C | Ta = 25 °C | 1 |
## CAD (KiCad official)
- Symbol: `1N5247B`
- 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/1n5247b-datasheet.pdf) (3 pp, sha256 `31e7ca5738ce26b3`, retrieved 2026-10-26, tier: manufacturer)
- **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/1n5247b-datasheet.pdf)