component
1SMB5349B
Public Made by Adomby adom
YFW Zener Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1SMB5349B
YFW · Zener Diodes · SMB
1SMB5349B from YFW, 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 | Cathode | passive | Cathode of the zener diode; operated at positive reverse voltage for regulation (zener voltage 3.3V to 200V series, 12 V for 1SMB5349B). |
| 2 | Anode | passive | Anode of the zener diode; maximum forward voltage 1.2 V at IF = 1.0 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| 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 tolerance (suffix B) | VZ | -5 | 5 | % | Suffix B indicates ±5% tolerance | 2 | |
| Nominal zener voltage | VZ | 12 | V | @ IZT | 2 | ||
| Maximum zener impedance | ZZT | 2.5 | Ω | @ IZT = 100 mA | 2 | ||
| Maximum zener impedance at knee | ZZK | 125 | Ω | @ IZK = 1.0 mA | 2 | ||
| Maximum reverse leakage current | IR | 2 | μA | @ VR = 9.1 V | 2 | ||
| Maximum zener current | IZM | 395 | mA | 2 | |||
| Maximum surge current | IZSM | 7.5 | A | Non-recurrent half-sine wave, 8.3 ms | 2 | ||
| Maximum regulator voltage | ΔVZ | 0.25 | V | 2 | |||
| Maximum forward voltage | VF | 1.2 | V | IF = 1.0 A | 1 | ||
| Power dissipation | PD | 5 | W | TL = 25 °C | 1 | ||
| Operating and storage temperature range | TJ, TSTG | -65 | 150 | °C | 1 | ||
| Thermal resistance, junction to ambient | RθJA | 90 | °C/W | Mounted on FR4 PC board (1 oz Cu) with recommended footprint | 1 | ||
| Thermal resistance, junction to lead | RθJL | 25 | °C/W | Mounted on FR4 PC board (1 oz Cu) with recommended footprint | 1 | ||
| Test current | IZT | 100 | mA | 2 |
CAD (KiCad official)
- Symbol:
1SMB5349B - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
1smb5349b-etched.step/1smb5349b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb5349b.step/1smb5349b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: YFW datasheet (3 pp, sha256
24001c3c727b3300, retrieved 2026-10-22, tier: lcsc) - 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).
# 1SMB5349B
**YFW** · Zener Diodes · SMB
1SMB5349B from YFW, 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 | Cathode | passive | Cathode of the zener diode; operated at positive reverse voltage for regulation (zener voltage 3.3V to 200V series, 12 V for 1SMB5349B). |
| 2 | Anode | passive | Anode of the zener diode; maximum forward voltage 1.2 V at IF = 1.0 A. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| 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 tolerance (suffix B) | VZ | -5 | | 5 | % | Suffix B indicates ±5% tolerance | 2 |
| Nominal zener voltage | VZ | | 12 | | V | @ IZT | 2 |
| Maximum zener impedance | ZZT | | | 2.5 | Ω | @ IZT = 100 mA | 2 |
| Maximum zener impedance at knee | ZZK | | | 125 | Ω | @ IZK = 1.0 mA | 2 |
| Maximum reverse leakage current | IR | | | 2 | μA | @ VR = 9.1 V | 2 |
| Maximum zener current | IZM | | | 395 | mA | | 2 |
| Maximum surge current | IZSM | | | 7.5 | A | Non-recurrent half-sine wave, 8.3 ms | 2 |
| Maximum regulator voltage | ΔVZ | | | 0.25 | V | | 2 |
| Maximum forward voltage | VF | | | 1.2 | V | IF = 1.0 A | 1 |
| Power dissipation | PD | | | 5 | W | TL = 25 °C | 1 |
| Operating and storage temperature range | TJ, TSTG | -65 | | 150 | °C | | 1 |
| Thermal resistance, junction to ambient | RθJA | | | 90 | °C/W | Mounted on FR4 PC board (1 oz Cu) with recommended footprint | 1 |
| Thermal resistance, junction to lead | RθJL | | | 25 | °C/W | Mounted on FR4 PC board (1 oz Cu) with recommended footprint | 1 |
| Test current | IZT | | 100 | | mA | | 2 |
## CAD (KiCad official)
- Symbol: `1SMB5349B`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb5349b-etched.step` / `1smb5349b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb5349b.step` / `1smb5349b.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [YFW datasheet](docs/1smb5349b-datasheet.pdf) (3 pp, sha256 `24001c3c727b3300`, retrieved 2026-10-22, tier: lcsc)
- **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/1smb5349b-datasheet.pdf)