component
MMBZ5251BLT1G
Public Made by Adomby adom
onsemi Zener Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Generated by kicad-footprint-generator · KiCad file format 20260206
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MMBZ5251BLT1G
onsemi · Zener Diodes · SOT-23
MMBZ5251BLT1G 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 | Anode terminal of the Zener diode; the datasheet gives the pinout only (Style 8: pin 1 = Anode) and no pin-specific electrical limits, with the device forward voltage VF specified as 0.95 V max at IF = 10 mA. |
| 2 | NC | unconnected | No connection (Style 8: pin 2 = No Connection); the datasheet pinout lists this pin as not internally connected. |
| 3 | Cathode | passive | Cathode terminal of the Zener diode, identified on the package by the polarity band; the datasheet gives no pin-specific electrical limits beyond the device ratings. |
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 (22 V nominal, 81B) | VZ | 20.9 | 22 | 23.1 | V | @ IZT 5.6 mA; pulse test at TA = 25°C (Note 3) | 3 |
| Maximum Zener Impedance | ZZT | 29 | Ω | @ IZT 5.6 mA | 3 | ||
| Maximum Zener Impedance | ZZK | 600 | Ω | @ IZK 0.25 mA | 3 | ||
| Reverse Leakage Current | IR | 0.1 | µA | @ VR 17 V | 3 | ||
| Forward Voltage | VF | 0.9 | V | @ IF 10 mA | 3 | ||
| Total Power Dissipation on FR-5 Board | PD | 225 | mW | TA = 25°C; FR-5 board (Note 1) | 1 | ||
| Derating above 25°C (FR-5 Board) | PD | 1.8 | mW/°C | Derated above 25°C; FR-5 board (Note 1) | 1 | ||
| Total Power Dissipation on Alumina Substrate | PD | 300 | mW | TA = 25°C; alumina substrate (Note 2) | 1 | ||
| Derating above 25°C (Alumina Substrate) | PD | 2.4 | mW/°C | Derated above 25°C; alumina substrate (Note 2) | 1 | ||
| Thermal Resistance, Junction-to-Ambient (FR-5 Board) | RJA | 556 | °C/W | FR-5 board (Note 1) | 1 | ||
| Thermal Resistance, Junction-to-Ambient (Alumina Substrate) | RJA | 417 | °C/W | Alumina substrate (Note 2) | 1 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
MMBZ5251BLT1G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbz5251blt1g-etched.step/mmbz5251blt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5251blt1g.step/mmbz5251blt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (7 pp, sha256
ab7a3f113b952d5a, retrieved 2026-10-18, 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).