component
1SMB5949BT3G
Public Made by Adomby adom
FUXINSEMI Zener Diodes, SMB(DO-214AA). 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
markdown1SMB5949BT3G
FUXINSEMI · Zener Diodes · SMB(DO-214AA)
1SMB5949BT3G from FUXINSEMI, in a SMB(DO-214AA). 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 | FUXINSEMI |
| Package | SMB(DO-214AA) |
| 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 (5% tolerance, suffix B) | VZ | 95 | 100 | 105 | V | @ IZT 3.7 mA | 2 |
| Zener voltage tolerance (suffix B) | -5 | 5 | % | Suffix B indicates 5% tolerance | 2 | ||
| Zener impedance | ZZT | 250 | Ω | @ IZT 3.7 mA | 2 | ||
| Zener impedance at knee | ZZK | 3100 | Ω | @ IZK 0.25 mA | 2 | ||
| Reverse leakage current | IR | 1 | µA | @ VR 76 V | 2 | ||
| Maximum zener current | IZM | 15 | mA | 2 | |||
| Maximum forward voltage | VF | 1.5 | V | IF = 200 mA | 1 | ||
| Maximum steady state power dissipation | PD | 3 | W | TL = 75°C, measured at zero lead length | 1 | ||
| Derate above 75 °C | 40 | mW/°C | Above TL = 75°C | 1 | |||
| Thermal resistance, junction to lead | RθJL | 25 | °C/W | 1 | |||
| Maximum steady state power dissipation at Ta | PD | 550 | mW | Ta = 25 °C, measured at zero lead length | 1 | ||
| Derate above 25 °C | 4.4 | mW/°C | Above Ta = 25°C | 1 | |||
| Thermal resistance, junction to ambient | RθJA | 226 | °C/W | 1 | |||
| Junction temperature range | TJ | -65 | 150 | °C | 1 | ||
| Storage temperature range | Tstg | -65 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
1SMB5949BT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
- 3D model files:
1smb5949bt3g-etched.step/1smb5949bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb5949bt3g.step/1smb5949bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: FUXINSEMI datasheet (4 pp, sha256
470df46c5bbb123a, retrieved 2026-10-21, tier: lcsc) - 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).