component
MMBZ5227BW
Public Made by Adomby adom
Changjing Bipolar (BJT), SOT-323. 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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README
markdownMMBZ5227BW
Changjing · Bipolar (BJT) · SOT-323
MMBZ5227BW from Changjing, in a SOT-323. 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 diode anode, drawn connected to the diode symbol on the page 1 internal diagram; the MMBZ5227BW has a nominal Vz of 3.6V (3.42V min to 3.78V max) at IZT=20mA. |
| 2 | NC | unconnected | Not connected internally; the page 1 diagram shows no connection from pin 2 to the diode. |
| 3 | K | passive | Zener diode cathode, wired to the bar side of the diode symbol on the page 1 diagram; it is positive relative to the anode in reverse (zener) operation, with 200mW maximum power dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-323 |
| Category | Transistors/Thyristors |
| 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, min, max) | VZ | 3.42 | 3.6 | 3.78 | V | IZT = 20 mA, short pulse; marking KG2 | 2 |
| Maximum zener impedance | ZZT | 24 | Ω | IZT = 20 mA | 2 | ||
| Maximum zener impedance (knee) | ZZK | 1700 | Ω | IZK = 0.25 mA | 2 | ||
| Maximum reverse leakage current | IR | 15 | µA | VR = 1.0 V | 2 | ||
| Forward voltage | VF | 0.9 | V | IF = 10mA | 1 | ||
| Power dissipation | PD | 200 | mW | 1 | |||
| Thermal resistance, junction to ambient air | RθJA | 625 | ℃/W | 1 | |||
| Operation junction and storage temperature range | TJ,Tstg | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
MMBZ5227BW - Footprint:
Package_TO_SOT_SMD:SOT-323_SC-70 - 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files:
mmbz5227bw-etched.step/mmbz5227bw-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5227bw.step/mmbz5227bw.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (5 pp, sha256
1a32e74c733857f5, retrieved 2026-10-18, 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).