component
MMBZ5239B
Public Made by Adomby adom
Changjing 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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README
markdownMMBZ5239B
Changjing · Zener Diodes · SOT-23
MMBZ5239B from Changjing, 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, shown on the page 1 symbol as the diode input side connected to pin 1. |
| 2 | NC | unconnected | No internal connection; shown on the page 1 symbol as an isolated open pin with no diode connected. |
| 3 | K | passive | Cathode of the zener diode, shown on the page 1 symbol on the zener-bar side; 9.1V nominal (8.65V to 9.56V) at IZT = 20mA for MMBZ5239B. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 | VZ | 8.65 | 9.1 | 9.56 | V | @ IZT = 20 mA | 2 |
| Maximum zener impedance | ZZT | 10 | Ω | @ IZT = 20 mA | 2 | ||
| Maximum zener impedance | ZZK | 600 | Ω | @ IZK = 0.25 mA | 2 | ||
| Maximum reverse leakage current | IR | 3 | µA | @ VR = 7.0 V | 2 | ||
| Power dissipation | PD | 300 | mW | Ta = 25℃ | 1 | ||
| Forward voltage | VF | 0.9 | V | @ IF = 10 mA | 1 | ||
| Thermal resistance, junction to ambient | RθJA | 417 | ℃/W | Junction to ambient | 1 | ||
| Operating junction and storage temperature range | TJ,TSTG | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
MMBZ5239B - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbz5239b-etched.step/mmbz5239b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5239b.step/mmbz5239b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (5 pp, sha256
eab0dbad2cbe9e7d, retrieved 2026-10-19, 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).