component
1N4739ATR
Public Made by Adomby adom
onsemi Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1N4739ATR
onsemi · Zener Diodes · DO-41
1N4739ATR from onsemi, in a DO-41. 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 end of the DO-41 glass case marked by the color band; the 1N4739A has VZ of 9.1 V (8.645 V min to 9.555 V max) at IZ = 28 mA. |
| 2 | A | passive | Anode, the unbanded end of the DO-41 glass case; the diode is forward conducting from anode to cathode and regulates in reverse (cathode positive). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | DO-41 |
| 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 | 8.645 | 9.1 | 9.555 | V | IZ = 7 mA (Note 1), TL = 30°C ± 1°C | 1 |
| Zener Voltage Tolerance | -5 | 5 | % | Tolerance = 5% | 1 | ||
| Max. Zener Impedance | ZZ | 5 | Ω | @ IZ = 28 mA | 1 | ||
| Max. Zener Impedance at knee | ZZK | 700 | Ω | @ IZK = 0.5 mA | 1 | ||
| Leakage Current | IR | 10 | µA | VR = 7 V | 1 | ||
| Non-Repetitive Peak Reverse Current | IZSM | 500 | mA | Square wave reverse surge at 8.3 msec soak time (Note 2) | 1 | ||
| Power Dissipation | PD | 1 | W | @ TL ≤ 50°C, Lead Length = 3/8" | 1 | ||
| Power Dissipation Derating | 6.67 | mW/°C | Derate above 50°C | 1 | |||
| Operating and Storage Temperature Range | TJ, TSTG | -65 | 200 | °C | 1 |
CAD (KiCad official)
- Symbol:
1N4739ATR - Footprint:
Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal - 3D model: DO-41 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (4 pp, sha256
a21fc849834a1030, retrieved 2026-10-22, 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).
# 1N4739ATR
**onsemi** · Zener Diodes · DO-41
1N4739ATR from onsemi, in a DO-41. 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 end of the DO-41 glass case marked by the color band; the 1N4739A has VZ of 9.1 V (8.645 V min to 9.555 V max) at IZ = 28 mA. |
| 2 | A | passive | Anode, the unbanded end of the DO-41 glass case; the diode is forward conducting from anode to cathode and regulates in reverse (cathode positive). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | DO-41 |
| 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 | 8.645 | 9.1 | 9.555 | V | IZ = 7 mA (Note 1), TL = 30°C ± 1°C | 1 |
| Zener Voltage Tolerance | | -5 | | 5 | % | Tolerance = 5% | 1 |
| Max. Zener Impedance | ZZ | | | 5 | Ω | @ IZ = 28 mA | 1 |
| Max. Zener Impedance at knee | ZZK | | | 700 | Ω | @ IZK = 0.5 mA | 1 |
| Leakage Current | IR | | | 10 | µA | VR = 7 V | 1 |
| Non-Repetitive Peak Reverse Current | IZSM | | | 500 | mA | Square wave reverse surge at 8.3 msec soak time (Note 2) | 1 |
| Power Dissipation | PD | | | 1 | W | @ TL ≤ 50°C, Lead Length = 3/8" | 1 |
| Power Dissipation Derating | | | | 6.67 | mW/°C | Derate above 50°C | 1 |
| Operating and Storage Temperature Range | TJ, TSTG | -65 | | 200 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `1N4739ATR`
- Footprint: `Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal`
- 3D model: DO-41 (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/1n4739atr-d.pdf) (4 pp, sha256 `a21fc849834a1030`, retrieved 2026-10-22, 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/1n4739atr-datasheet.pdf)