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1SMB5918BT3G-MS
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MSKSEMI Zener Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1SMB5918BT3G-MS
MSKSEMI · Zener Diodes · SMB
1SMB5918BT3G-MS from MSKSEMI, 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, marked by the polarity band; the Zener (reverse) voltage VZ is 5.1 V nominal (4.84 V to 5.36 V) at IZT = 73.5 mA for the 1SMB5918B. |
| 2 | A | passive | Anode; forward voltage VF is 1.5 V max at IF = 200 mA(dc). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| 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 | 4.84 | 5.1 | 5.36 | V | @ IZT = 73.5 mA, TL = 30°C | 4 |
| Zener Test Current | IZT | 73.5 | mA | 4 | |||
| Maximum Zener Impedance | ZZT | 4 | Ω | @ IZT | 4 | ||
| Maximum Zener Impedance | ZZK | 350 | Ω | @ IZK = 1 mA | 4 | ||
| Reverse Leakage Current | IR | 5 | μA | @ VR = 2 V | 4 | ||
| Maximum DC Zener Current | IZM | 294 | mA | 4 | |||
| Forward Voltage | VF | 1.5 | V | IF = 200 mA(dc), all types | 3 | ||
| Steady State Power Dissipation | PD | 3 | W | TL = 75°C, zero lead length | 2 | ||
| Steady State Power Dissipation | PD | 550 | mW | TA = 25°C, FR-4 board, recommended footprint | 2 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 2 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 25 | °C/W | 2 | |||
| Thermal Resistance Junction-to-Ambient | RθJA | 226 | °C/W | 2 | |||
| Power Derating above 75°C | 40 | mW/°C | Above TL = 75°C | 2 | |||
| Power Derating above 25°C | 4.4 | mW/°C | Above TA = 25°C | 2 | |||
| Zener Voltage Tolerance | -5 | 5 | % | Type numbers indicate ±5% tolerance | 4 |
CAD (KiCad official)
- Symbol:
1SMB5918BT3G-MS - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
1smb5918bt3g-ms-etched.step/1smb5918bt3g-ms-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb5918bt3g-ms.step/1smb5918bt3g-ms.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MSKSEMI datasheet (8 pp, sha256
d1db003dcf102a3c, 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).
# 1SMB5918BT3G-MS
**MSKSEMI** · Zener Diodes · SMB
1SMB5918BT3G-MS from MSKSEMI, 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, marked by the polarity band; the Zener (reverse) voltage VZ is 5.1 V nominal (4.84 V to 5.36 V) at IZT = 73.5 mA for the 1SMB5918B. |
| 2 | A | passive | Anode; forward voltage VF is 1.5 V max at IF = 200 mA(dc). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| 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 | 4.84 | 5.1 | 5.36 | V | @ IZT = 73.5 mA, TL = 30°C | 4 |
| Zener Test Current | IZT | | 73.5 | | mA | | 4 |
| Maximum Zener Impedance | ZZT | | | 4 | Ω | @ IZT | 4 |
| Maximum Zener Impedance | ZZK | | | 350 | Ω | @ IZK = 1 mA | 4 |
| Reverse Leakage Current | IR | | | 5 | μA | @ VR = 2 V | 4 |
| Maximum DC Zener Current | IZM | | | 294 | mA | | 4 |
| Forward Voltage | VF | | | 1.5 | V | IF = 200 mA(dc), all types | 3 |
| Steady State Power Dissipation | PD | | | 3 | W | TL = 75°C, zero lead length | 2 |
| Steady State Power Dissipation | PD | | | 550 | mW | TA = 25°C, FR-4 board, recommended footprint | 2 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 2 |
| Thermal Resistance Junction-to-Lead | RθJL | | 25 | | °C/W | | 2 |
| Thermal Resistance Junction-to-Ambient | RθJA | | 226 | | °C/W | | 2 |
| Power Derating above 75°C | | | 40 | | mW/°C | Above TL = 75°C | 2 |
| Power Derating above 25°C | | | 4.4 | | mW/°C | Above TA = 25°C | 2 |
| Zener Voltage Tolerance | | -5 | | 5 | % | Type numbers indicate ±5% tolerance | 4 |
## CAD (KiCad official)
- Symbol: `1SMB5918BT3G-MS`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb5918bt3g-ms-etched.step` / `1smb5918bt3g-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb5918bt3g-ms.step` / `1smb5918bt3g-ms.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [MSKSEMI datasheet](docs/1smb5918bt3g-ms-datasheet.pdf) (8 pp, sha256 `d1db003dcf102a3c`, 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/1smb5918bt3g-ms-datasheet.pdf)