component
MMBZ5231BLT1G
Public Made by Adomby adom
onsemi Zener Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMBZ5231BLT1G
onsemi · Zener Diodes · SOT-23
MMBZ5231BLT1G from onsemi, in a SOT-23. 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 | Anode | passive | Zener diode anode; the device is rated for a forward voltage VF of 0.95 V max at IF = 10 mA. |
| 2 | NC | unconnected | No connection; the datasheet lists this pin as NC (no connection) in the Style 8 pinout. |
| 3 | Cathode | passive | Zener diode cathode, marked by the polarity band on the package; the MMBZ5231BLT1G regulates at a nominal VZ of 5.1 V (4.84 V min to 5.36 V max) at IZT = 20 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 4.84 | 5.1 | 5.36 | V | @ IZT = 20 mA; pulse test at TA = 25°C (Note 3) | 3 |
| Maximum Zener Impedance | ZZT | 17 | Ω | @ IZT = 20 mA | 3 | ||
| Maximum Zener Impedance | ZZK | 1600 | Ω | @ IZK = 0.25 mA | 3 | ||
| Reverse Leakage Current | IR | 5 | µA | @ VR = 2 V | 3 | ||
| Forward Voltage | VF | 0.9 | V | @ IF = 10 mA, for all types | 3 | ||
| Total Power Dissipation on FR-5 Board (Note 1) | PD | 225 | mW | @ TA = 25°C | 1 | ||
| Total Power Dissipation on Alumina Substrate (Note 2) | PD | 300 | mW | @ TA = 25°C | 1 | ||
| Thermal Resistance, Junction-to-Ambient (FR-5 Board, Note 1) | RJA | 556 | °C/W | FR-5 board | 1 | ||
| Thermal Resistance, Junction-to-Ambient (Alumina Substrate, Note 2) | RJA | 417 | °C/W | Alumina substrate | 1 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
MMBZ5231BLT1G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbz5231blt1g-etched.step/mmbz5231blt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5231blt1g.step/mmbz5231blt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
50172f59ef317c72, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).
# MMBZ5231BLT1G
**onsemi** · Zener Diodes · SOT-23
MMBZ5231BLT1G from onsemi, in a SOT-23. 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 | Anode | passive | Zener diode anode; the device is rated for a forward voltage VF of 0.95 V max at IF = 10 mA. |
| 2 | NC | unconnected | No connection; the datasheet lists this pin as NC (no connection) in the Style 8 pinout. |
| 3 | Cathode | passive | Zener diode cathode, marked by the polarity band on the package; the MMBZ5231BLT1G regulates at a nominal VZ of 5.1 V (4.84 V min to 5.36 V max) at IZT = 20 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 4.84 | 5.1 | 5.36 | V | @ IZT = 20 mA; pulse test at TA = 25°C (Note 3) | 3 |
| Maximum Zener Impedance | ZZT | | | 17 | Ω | @ IZT = 20 mA | 3 |
| Maximum Zener Impedance | ZZK | | | 1600 | Ω | @ IZK = 0.25 mA | 3 |
| Reverse Leakage Current | IR | | | 5 | µA | @ VR = 2 V | 3 |
| Forward Voltage | VF | | | 0.9 | V | @ IF = 10 mA, for all types | 3 |
| Total Power Dissipation on FR-5 Board (Note 1) | PD | | | 225 | mW | @ TA = 25°C | 1 |
| Total Power Dissipation on Alumina Substrate (Note 2) | PD | | | 300 | mW | @ TA = 25°C | 1 |
| Thermal Resistance, Junction-to-Ambient (FR-5 Board, Note 1) | RJA | | | 556 | °C/W | FR-5 board | 1 |
| Thermal Resistance, Junction-to-Ambient (Alumina Substrate, Note 2) | RJA | | | 417 | °C/W | Alumina substrate | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `MMBZ5231BLT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbz5231blt1g-etched.step` / `mmbz5231blt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbz5231blt1g.step` / `mmbz5231blt1g.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/8586172659667513344) (6 pp, sha256 `50172f59ef317c72`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/mmbz5231blt1g-datasheet.pdf)