component
MMBZ5251B-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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownMMBZ5251B-7-F
Diodes Incorporated · Zener Diodes · SOT-23
MMBZ5251B-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 | Anode of the zener diode, the bottom-left terminal in the device schematic (SOT23 numbering inferred). |
| 2 | NC | unconnected | No internal connection; the bottom-right terminal in the device schematic is not connected to the diode. |
| 3 | K | passive | Cathode of the zener diode, the top terminal in the device schematic; VZ is 20.90V min to 23.10V max at IZT = 5.6mA for MMBZ5251B. |
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) | VZ | 20.9 | 22 | 23.1 | V | @ IZT = 5.6 mA; short pulse test (Note 7) | 3 |
| Maximum zener impedance | ZZT | 29 | Ω | @ IZT = 5.6 mA, f = 1kHz | 3 | ||
| Maximum zener impedance | ZZK | 600 | Ω | @ IZK = 0.25 mA, f = 1kHz | 3 | ||
| Maximum reverse leakage current | IR | 0.1 | µA | @ VR = 17 V | 3 | ||
| Forward voltage | VF | 0.9 | V | @ IF = 10mA | 2 | ||
| Power dissipation | PD | 350 | mW | Note 6: mounted on FR4 PC board with recommended pad layout | 2 | ||
| Thermal resistance, junction to ambient air | RθJA | 357 | °C/W | Note 6: mounted on FR4 PC board with recommended pad layout | 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:
MMBZ5251B-7-F - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbz5251b-7-f-etched.step/mmbz5251b-7-f-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5251b-7-f.step/mmbz5251b-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 2026-10-17, 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).