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MMBZ5221B-7-F

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Diodes Incorporated Zener Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MMBZ5221B-7-F

Diodes Incorporated · Zener Diodes · SOT-23

MMBZ5221B-7-F from Diodes Incorporated, 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, connected to the diode in the device schematic.
2 NC unconnected No internal connection; the pin is drawn without a connection in the device schematic.
3 K passive Zener cathode, connected to the diode in the device schematic.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
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 (nominal typ, min, max) VZ 2.28 2.4 2.52 V @ IZT = 20 mA 3
Maximum Zener impedance ZZT 30 Ω @ IZT = 20 mA, f = 1kHz 3
Maximum Zener impedance (knee) ZZK 1200 Ω @ IZK = 0.25 mA, f = 1kHz 3
Maximum reverse leakage current IR 100 µA @ VR = 1.0 V 3
Power dissipation PD 350 mW Mounted on FR4 PC board with recommended pad layout (Note 6) 2
Thermal resistance, junction to ambient air RθJA 357 °C/W Mounted on FR4 PC board with recommended pad layout (Note 6) 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  Terminal Connections: See Diagram  Terminals: Matte Tin Finish Annealed over Alloy 42 Leadframe 1

CAD (KiCad official)

  • Symbol: MMBZ5221B-7-F
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: mmbz5221b-7-f-etched.step / mmbz5221b-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbz5221b-7-f.step / mmbz5221b-7-f.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 be3510eb4019f5d5, retrieved 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-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).

Datasheet PDF