component
1SMB5945BT3G
Public Made by Adomby adom
onsemi Zener Diodes, SMB. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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
markdown1SMB5945BT3G
onsemi · Zener Diodes · SMB
1SMB5945BT3G from onsemi, in a SMB. 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 banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SMB |
| 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 (nominal, min/max at IZT) | VZ | 64.6 | 68 | 71.4 | V | @ IZT = 5.5 mA; TL = 30°C unless otherwise noted | 3 |
| Zener voltage tolerance (type number designation) | -5 | 5 | % | Type number indicates ±5% tolerance (Note 2) | 3 | ||
| Maximum Zener impedance at IZT | ZZT | 120 | Ω | @ IZT, 60 Hz, IZ(ac) = 0.1 IZ(dc) (Note 4) | 3 | ||
| Maximum Zener impedance at IZK | ZZK | 1700 | Ω | @ IZK = 0.25 mA, 60 Hz, IZ(ac) = 0.1 IZ(dc) (Note 4) | 3 | ||
| Reverse leakage current IR | IR | 1 | µA | @ VR = 51.7 V | 3 | ||
| Maximum DC Zener current | IZM | 22 | mA(dc) | 3 | |||
| Forward voltage VF | VF | 1.5 | V | @ IF = 200 mA(dc) for all types | 2 | ||
| Steady state power dissipation PD at TL | PD | 3 | W | @ TL = 75°C; measured at zero lead length | 1 | ||
| Derating above 75°C (TL) | 40 | mW/°C | Derate above TL = 75°C | 1 | |||
| Thermal resistance junction-to-lead | RθJL | 25 | °C/W | Junction-to-lead | 1 | ||
| Steady state power dissipation PD at TA | PD | 550 | mW | @ TA = 25°C; FR-4 board, recommended footprint (Note 1) | 1 | ||
| Derating above 25°C (TA) | 4.4 | mW/°C | Derate above TA = 25°C | 1 | |||
| Thermal resistance junction-to-ambient | RθJA | 226 | °C/W | Junction-to-ambient; FR-4 board, recommended footprint (Note 1) | 1 | ||
| Operating and storage temperature range | TJ, Tstg | -65 | 150 | °C | Operating junction and storage temperature | 1 |
CAD (KiCad official)
- Symbol:
1SMB5945BT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
1smb5945bt3g-etched.step/1smb5945bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb5945bt3g.step/1smb5945bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
e95f4deeabd8ea97, retrieved 2026-10-21, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).