component
MMBZ5221B-7-F
Public Made by Adomby adom
Diodes Incorporated Zener Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMBZ5221B-7-F
Diodes Incorporated · Zener Diodes · SOT-23
MMBZ5221B-7-F from Diodes Incorporated, 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 | A | passive | Zener anode, connected to the diode in the device schematic. |
| 2 | NC | unconnected | No internal connection; the pin is drawn without a connection in the device schematic. |
| 3 | K | passive | Zener cathode, connected to the diode in the device schematic. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage (nominal typ, min, max) | VZ | 2.28 | 2.4 | 2.52 | V | @ IZT = 20 mA | 3 |
| Maximum Zener impedance | ZZT | 30 | Ω | @ IZT = 20 mA, f = 1kHz | 3 | ||
| Maximum Zener impedance (knee) | ZZK | 1200 | Ω | @ IZK = 0.25 mA, f = 1kHz | 3 | ||
| Maximum reverse leakage current | IR | 100 | µA | @ VR = 1.0 V | 3 | ||
| Power dissipation | PD | 350 | mW | Mounted on FR4 PC board with recommended pad layout (Note 6) | 2 | ||
| Thermal resistance, junction to ambient air | RθJA | 357 | °C/W | Mounted on FR4 PC board with recommended pad layout (Note 6) | 2 | ||
| Operating and storage temperature range | TJ, TSTG | -65 | 150 | °C | 2 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | Terminal Connections: See Diagram Terminals: Matte Tin Finish Annealed over Alloy 42 Leadframe | 1 |
CAD (KiCad official)
- Symbol:
MMBZ5221B-7-F - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbz5221b-7-f-etched.step/mmbz5221b-7-f-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5221b-7-f.step/mmbz5221b-7-f.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (7 pp, sha256
be3510eb4019f5d5, retrieved 2026-10-21, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# MMBZ5221B-7-F
**Diodes Incorporated** · Zener Diodes · SOT-23
MMBZ5221B-7-F from Diodes Incorporated, 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 | A | passive | Zener anode, connected to the diode in the device schematic. |
| 2 | NC | unconnected | No internal connection; the pin is drawn without a connection in the device schematic. |
| 3 | K | passive | Zener cathode, connected to the diode in the device schematic. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage (nominal typ, min, max) | VZ | 2.28 | 2.4 | 2.52 | V | @ IZT = 20 mA | 3 |
| Maximum Zener impedance | ZZT | | | 30 | Ω | @ IZT = 20 mA, f = 1kHz | 3 |
| Maximum Zener impedance (knee) | ZZK | | | 1200 | Ω | @ IZK = 0.25 mA, f = 1kHz | 3 |
| Maximum reverse leakage current | IR | | | 100 | µA | @ VR = 1.0 V | 3 |
| Power dissipation | PD | | | 350 | mW | Mounted on FR4 PC board with recommended pad layout (Note 6) | 2 |
| Thermal resistance, junction to ambient air | RθJA | | | 357 | °C/W | Mounted on FR4 PC board with recommended pad layout (Note 6) | 2 |
| Operating and storage temperature range | TJ, TSTG | -65 | | 150 | °C | | 2 |
## Materials and finish
As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | | tin | Terminal Connections: See Diagram Terminals: Matte Tin Finish Annealed over Alloy 42 Leadframe | 1 |
## CAD (KiCad official)
- Symbol: `MMBZ5221B-7-F`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbz5221b-7-f-etched.step` / `mmbz5221b-7-f-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbz5221b-7-f.step` / `mmbz5221b-7-f.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Diodes Incorporated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8560089242379440128) (7 pp, sha256 `be3510eb4019f5d5`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/mmbz5221b-7-f-datasheet.pdf)