component
MMBZ5254B
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
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownMMBZ5254B
Changjing · Zener Diodes · SOT-23
MMBZ5254B 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 | Zener anode, shown on the page 1 symbol as the diode input; the MMBZ5254B has a 27V nominal Zener voltage (25.65V to 28.35V) at IZT = 5.0mA. |
| 2 | NC | unconnected | Pin 2 is drawn as an isolated terminal with no internal connection in the page 1 symbol. |
| 3 | K | passive | Zener cathode, the bar side of the diode symbol; maximum leakage is 0.1µA at VR = 21V and power dissipation is limited to 300mW. |
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 | 25.65 | 27 | 28.35 | V | @ IZT = 5.0 mA | 2 |
| Maximum Zener Impedance | ZZT | 41 | Ω | @ IZT = 5.0 mA, f = 1kHz | 2 | ||
| Maximum Zener Impedance (knee) | ZZK | 600 | Ω | @ IZK = 0.25mA | 2 | ||
| Maximum Reverse Leakage Current | IR | 0.1 | µA | @ VR = 21 V | 2 | ||
| Forward Voltage | VF | 0.9 | V | IF = 10mA | 1 | ||
| Power Dissipation | PD | 300 | mW | Ta = 25℃ | 1 | ||
| Operation Junction and Storage Temperature Range | TJ,TSTG | -55 | 150 | ℃ | 1 | ||
| Thermal Resistance Junction to Ambient | RθJA | 417 | ℃/W | 1 | |||
| Zener Test Current | IZT | 5 | mA | Test current for VZ and ZZT | 2 | ||
| Nominal Zener Voltage | VZ nom | 27 | V | @ IZT | 2 |
CAD (KiCad official)
- Symbol:
MMBZ5254B - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbz5254b-etched.step/mmbz5254b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5254b.step/mmbz5254b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (5 pp, sha256
eab0dbad2cbe9e7d, retrieved 2026-10-22, 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).