component
1N4742ATR
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
markdown1N4742ATR
onsemi · Zener Diodes · DO-41
1N4742ATR 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; for the 1N4742A 12 V zener (VZ 11.4 to 12.6 V at IZ = 21 mA) this is the terminal that goes positive in reverse breakdown. |
| 2 | A | passive | Anode, the unbanded end of the DO-41 glass case; the 1N4742A is rated 1.0 W at TL ≤ 50°C with 3/8 inch lead length. |
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 | 11.4 | 12 | 12.6 | V | @ IZ = 21 mA, Ta = 25°C | 1 |
| Zener Voltage Tolerance | -5 | 5 | % | Tolerance = 5% | 1 | ||
| Max. Zener Impedance | ZZ | 9 | Ω | @ IZ = 21 mA | 1 | ||
| Max. Zener Impedance at knee | ZZK | 700 | Ω | @ IZK = 0.25 mA | 1 | ||
| Leakage Current | IR | 5 | µA | VR = 9.1 V | 1 | ||
| Non-Repetitive Peak Reverse Current | IZSM | 380 | mA | Square wave reverse surge at 8.3 msec soak time | 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 | ||
| Zener Test Current | IZ | 21 | mA | Test current for VZ | 1 | ||
| Knee Test Current | IZK | 0.25 | mA | Test current for ZZK | 1 |
CAD (KiCad official)
- Symbol:
1N4742ATR - 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).