component
MMSZ5221B-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
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.
Contents
README
markdownMMSZ5221B-7-F
Diodes Incorporated · Zener Diodes · SOD-123
MMSZ5221B-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 terminal on the cathode-band end of the SOD123 body, which goes positive in reverse (Zener) operation; MMSZ5221B is 2.4V nominal (2.28 to 2.52V) at IZT = 20mA. |
| 2 | A | passive | Anode, the terminal opposite the cathode band; forward voltage is 0.9V at IF = 10mA and the device is rated 500mW at TL = +75°C. |
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 (min) | VZ | 2.28 | V | IZT = 20 mA | 2 | ||
| Zener voltage (nominal) | VZ | 2.4 | V | IZT = 20 mA | 2 | ||
| Zener voltage (max) | VZ | 2.52 | V | IZT = 20 mA | 2 | ||
| Maximum Zener impedance | ZZT | 30 | Ω | f = 1KHz, IZT = 20 mA | 2 | ||
| Maximum Zener impedance at knee current | ZZK | 1200 | Ω | IZK = 0.25 mA | 2 | ||
| Maximum reverse leakage current | IR | 100 | A | VR = 1.0 V | 2 | ||
| Forward voltage | VF | 0.9 | V | IF = 10mA | 2 | ||
| Power dissipation at TL | PD | 500 | mW | TL = +75°C (Note 4) | 2 | ||
| Power dissipation at TA | PD | 370 | mW | TA = +25°C (Note 5) | 2 | ||
| Thermal resistance, junction to ambient air | RθJA | 338 | °C/W | Note 5 | 2 | ||
| Thermal resistance, junction to lead | RθJL | 132 | °C/W | Note 4 | 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:
MMSZ5221B-7-F - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5221b-7-f-etched.step/mmsz5221b-7-f-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5221b-7-f.step/mmsz5221b-7-f.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (5 pp, sha256
7c7ac7a58521db27, 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).