component
1SMB5948BT3G
Public Made by Adomby adom
onsemi Zener Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1SMB5948BT3G
onsemi · Zener Diodes · SMB
1SMB5948BT3G 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 | Cathode | passive | Cathode, indicated by the polarity band; for the 1SMB5948B the Zener voltage is 91 V nominal (86.45 V to 95.55 V) at IZT = 4.1 mA. |
| 2 | Anode | passive | Anode terminal of the 3 W Zener diode; maximum steady-state power dissipation is 3.0 W at TL = 75°C. |
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 | 86.45 | 91 | 95.55 | V | @ IZT = 4.1 mA, TL = 30°C | 3 |
| Zener Test Current | IZT | 4.1 | mA | 3 | |||
| Maximum Zener Impedance | ZZT | 200 | Ω | @ IZT = 4.1 mA | 3 | ||
| Maximum Zener Impedance | ZZK | 3000 | Ω | @ IZK = 0.25 mA | 3 | ||
| Reverse Leakage Current | IR | 1 | µA | @ VR = 69.2 V | 3 | ||
| Maximum DC Zener Current | IZM | 16 | mA | 3 | |||
| Forward Voltage | VF | 1.5 | V | IF = 200 mA(dc) | 3 | ||
| Zener Voltage Tolerance | -5 | 5 | % | Type number indicates tolerance of ±5% | 3 | ||
| Maximum Steady State Power Dissipation | PD | 3 | W | @ TL = 75°C, measured at zero lead length | 1 | ||
| Derating above 75°C | 40 | mW/°C | Derate above 75°C | 1 | |||
| Maximum Steady State Power Dissipation | PD | 550 | mW | @ TA = 25°C, FR-4 board, recommended footprint | 1 | ||
| Derating above 25°C | 4.4 | mW/°C | Derate above 25°C | 1 | |||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 25 | °C/W | 1 | |||
| Thermal Resistance Junction-to-Ambient | RθJA | 226 | °C/W | FR-4 board, recommended footprint | 1 |
CAD (KiCad official)
- Symbol:
1SMB5948BT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
1smb5948bt3g-etched.step/1smb5948bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb5948bt3g.step/1smb5948bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
e95f4deeabd8ea97, retrieved 2026-10-22, tier: manufacturer) - 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).
# 1SMB5948BT3G
**onsemi** · Zener Diodes · SMB
1SMB5948BT3G 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 | Cathode | passive | Cathode, indicated by the polarity band; for the 1SMB5948B the Zener voltage is 91 V nominal (86.45 V to 95.55 V) at IZT = 4.1 mA. |
| 2 | Anode | passive | Anode terminal of the 3 W Zener diode; maximum steady-state power dissipation is 3.0 W at TL = 75°C. |
## 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 | 86.45 | 91 | 95.55 | V | @ IZT = 4.1 mA, TL = 30°C | 3 |
| Zener Test Current | IZT | | 4.1 | | mA | | 3 |
| Maximum Zener Impedance | ZZT | | | 200 | Ω | @ IZT = 4.1 mA | 3 |
| Maximum Zener Impedance | ZZK | | | 3000 | Ω | @ IZK = 0.25 mA | 3 |
| Reverse Leakage Current | IR | | | 1 | µA | @ VR = 69.2 V | 3 |
| Maximum DC Zener Current | IZM | | | 16 | mA | | 3 |
| Forward Voltage | VF | | | 1.5 | V | IF = 200 mA(dc) | 3 |
| Zener Voltage Tolerance | | -5 | | 5 | % | Type number indicates tolerance of ±5% | 3 |
| Maximum Steady State Power Dissipation | PD | | | 3 | W | @ TL = 75°C, measured at zero lead length | 1 |
| Derating above 75°C | | | | 40 | mW/°C | Derate above 75°C | 1 |
| Maximum Steady State Power Dissipation | PD | | | 550 | mW | @ TA = 25°C, FR-4 board, recommended footprint | 1 |
| Derating above 25°C | | | | 4.4 | mW/°C | Derate above 25°C | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Thermal Resistance Junction-to-Lead | RθJL | | 25 | | °C/W | | 1 |
| Thermal Resistance Junction-to-Ambient | RθJA | | 226 | | °C/W | FR-4 board, recommended footprint | 1 |
## CAD (KiCad official)
- Symbol: `1SMB5948BT3G`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb5948bt3g-etched.step` / `1smb5948bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb5948bt3g.step` / `1smb5948bt3g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/1smb5948bt3-d.pdf) (6 pp, sha256 `e95f4deeabd8ea97`, retrieved 2026-10-22, tier: manufacturer)
- **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/1smb5948bt3g-datasheet.pdf)