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MMSZ5254BQ-7-F
Public Made by Adomby adom
Diodes Incorporated Zener Diodes, SOD-123. 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
markdownMMSZ5254BQ-7-F
Diodes Incorporated · Zener Diodes · SOD-123
MMSZ5254BQ-7-F from Diodes Incorporated, in a SOD-123. 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 | K | passive | Cathode, the end marked with the cathode band; it goes positive for Zener breakdown (27V nominal, 25.65V to 28.35V at 5.0mA for the MMSZ5254B). |
| 2 | A | passive | Anode, the end opposite the cathode band; forward voltage is 0.9V at IF = 10mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOD-123 |
| Category | Diodes |
| Pins | 2 |
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 27 V, type code K4) | VZ | 25.65 | 27 | 28.35 | V | @ IZT = 5.0 mA | 2 |
| Maximum Zener Impedance (ZZT) | ZZT | 41 | Ω | f = 1KHz, IZT = 5.0 mA | 2 | ||
| Maximum Zener Impedance (ZZK) | ZZK | 600 | Ω | IZK = 0.25 mA | 2 | ||
| Maximum Reverse Leakage Current | IR | 0.1 | µA | VR = 21 V | 2 | ||
| Forward Voltage | VF | 0.9 | V | IF = 10mA | 2 | ||
| Power Dissipation (Note 4) | PD | 500 | mW | TL = +75°C | 2 | ||
| Power Dissipation (Note 5) | PD | 370 | mW | TA = +25°C | 2 | ||
| Thermal Resistance, Junction to Ambient Air (Note 5) | RθJA | 338 | °C/W | Device mounted on ceramic PCB with copper pad areas 40mm2 | 2 | ||
| Thermal Resistance, Junction to Lead (Note 4) | RθJL | 132 | °C/W | 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 | • Terminals: Matte Tin Finish annealed over Alloy 42 leadframe (Lead Free Plating). Solderable per MIL-STD-202, Method 208 | 1 |
CAD (KiCad official)
- Symbol:
MMSZ5254BQ-7-F - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5254bq-7-f-etched.step/mmsz5254bq-7-f-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5254bq-7-f.step/mmsz5254bq-7-f.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (6 pp, sha256
1fea20eb263b98e4, 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).