component
1SMB5937BT3G
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.
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1SMB5937BT3G
onsemi · Zener Diodes · SMB
1SMB5937BT3G 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 (min) | VZ | 31.35 | 33 | 34.65 | V | @ IZT (11.4 mA), TL = 30C | 3 |
| Zener impedance ZZT (max) | ZZT | 33 | Ω | @ IZT (11.4 mA); IZ(ac) = 0.1 IZ(dc), 60 Hz | 3 | ||
| Zener impedance ZZK (max) | ZZK | 800 | Ω | @ IZK (0.25 mA); IZ(ac) = 0.1 IZ(dc), 60 Hz | 3 | ||
| Reverse leakage current (max) | IR | 1 | µA | @ VR (25.1 V) | 3 | ||
| Maximum DC Zener current | IZM | 45 | mA(dc) | 3 | |||
| Forward voltage (max) | VF | 1.5 | V | @ IF = 200 mA(dc) | 2 | ||
| Zener voltage tolerance (B suffix) | -5 | 5 | % | 5% type per type-number designation (note 2) | 3 | ||
| Maximum steady state power dissipation | PD | 3 | W | @ TL = 75C, measured at zero lead length | 1 | ||
| Derating above 75C (lead temperature) | PD | 25 | mW/C | Derate above TL = 75C | 1 | ||
| Maximum steady state power dissipation (ambient) | PD | 550 | mW | @ TA = 25C (Note 1, FR-4 board, recommended footprint) | 1 | ||
| Derating above 25C (ambient) | PD | 4.4 | mW/C | Derate above TA = 25C | 1 | ||
| Thermal resistance junction-to-lead | RθJL | 40 | C/W | Junction-to-lead | 1 | ||
| Thermal resistance junction-to-ambient | RθJA | 226 | C/W | Junction-to-ambient (Note 1, FR-4 board) | 1 | ||
| Operating and storage temperature range | TJ, Tstg | -65 | 150 | C | 1 |
CAD (KiCad official)
- Symbol:
1SMB5937BT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
1smb5937bt3g-etched.step/1smb5937bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb5937bt3g.step/1smb5937bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
52985d4757f03142, retrieved 2026-10-14, 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).
# 1SMB5937BT3G
**onsemi** · Zener Diodes · SMB
1SMB5937BT3G 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 (min) | VZ | 31.35 | 33 | 34.65 | V | @ IZT (11.4 mA), TL = 30C | 3 |
| Zener impedance ZZT (max) | ZZT | | | 33 | Ω | @ IZT (11.4 mA); IZ(ac) = 0.1 IZ(dc), 60 Hz | 3 |
| Zener impedance ZZK (max) | ZZK | | | 800 | Ω | @ IZK (0.25 mA); IZ(ac) = 0.1 IZ(dc), 60 Hz | 3 |
| Reverse leakage current (max) | IR | | | 1 | µA | @ VR (25.1 V) | 3 |
| Maximum DC Zener current | IZM | | | 45 | mA(dc) | | 3 |
| Forward voltage (max) | VF | | | 1.5 | V | @ IF = 200 mA(dc) | 2 |
| Zener voltage tolerance (B suffix) | | -5 | | 5 | % | 5% type per type-number designation (note 2) | 3 |
| Maximum steady state power dissipation | PD | | | 3 | W | @ TL = 75C, measured at zero lead length | 1 |
| Derating above 75C (lead temperature) | PD | | 25 | | mW/C | Derate above TL = 75C | 1 |
| Maximum steady state power dissipation (ambient) | PD | | | 550 | mW | @ TA = 25C (Note 1, FR-4 board, recommended footprint) | 1 |
| Derating above 25C (ambient) | PD | | 4.4 | | mW/C | Derate above TA = 25C | 1 |
| Thermal resistance junction-to-lead | RθJL | | 40 | | C/W | Junction-to-lead | 1 |
| Thermal resistance junction-to-ambient | RθJA | | 226 | | C/W | Junction-to-ambient (Note 1, FR-4 board) | 1 |
| Operating and storage temperature range | TJ, Tstg | -65 | | 150 | C | | 1 |
## CAD (KiCad official)
- Symbol: `1SMB5937BT3G`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb5937bt3g-etched.step` / `1smb5937bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb5937bt3g.step` / `1smb5937bt3g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588879946559602688) (6 pp, sha256 `52985d4757f03142`, retrieved 2026-10-14, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/1smb5937bt3g-datasheet.pdf)