component
1N4749ATR
Public Made by Adomby adom
onsemi Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown1N4749ATR
onsemi · Zener Diodes · DO-41
1N4749ATR 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 | Cathode | passive | Cathode, identified by the color band on the DO-41 glass case; the zener is reverse-biased with this terminal positive (1N4749A VZ 24 V nominal at 10.5 mA). |
| 2 | A | passive | Anode, the terminal opposite the color band on the DO-41 glass case. |
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 | 22.8 | 24 | 25.2 | V | @ IZ = 10.5 mA, Ta = 25°C | 2 |
| Zener Test Current | IZ | 10.5 | mA | Test current for VZ | 2 | ||
| Max. Zener Impedance | ZZ | 25 | Ω | @ IZ | 2 | ||
| Max. Zener Impedance (knee) | ZZK | 750 | Ω | @ IZK = 0.25 mA | 2 | ||
| Leakage Current | IR | 5 | µA | @ VR = 18.2 V | 2 | ||
| Non-Repetitive Peak Reverse Current | IZSM | 190 | mA | Square wave reverse surge at 8.3 msec soak time | 2 | ||
| Power Dissipation | PD | 1 | W | @ TL ≤ 50°C, Lead Length = 3/8" | 1 | ||
| Power 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:
1N4749ATR - 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 2026-10-23, 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).