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MMBZ5257BQ-7-F

Public Made by Adom

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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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MMBZ5257BQ-7-F

Diodes Incorporated · Zener Diodes · SOT-23

MMBZ5257BQ-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 Anode of the Zener diode, the bottom-left terminal in the top-view device schematic.
2 NC unconnected Bottom-right terminal; the device schematic shows no internal connection to the diode.
3 K passive Cathode of the Zener diode, the single top terminal in the device schematic; for MMBZ5257B the Zener voltage is 33V nominal (31.35V to 34.65V) at IZT = 3.8mA.

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 VZ 31.35 33 34.65 V IZT = 3.8mA, short duration pulse test 3
Test Current IZT 3.8 mA 3
Maximum Zener Impedance ZZT 58 Ω @ IZT, f = 1kHz 3
Maximum Zener Impedance (knee) ZZK 700 Ω @ IZK = 0.25mA, f = 1kHz 3
Maximum Reverse Leakage Current IR 0.1 µA VR = 25V, short duration pulse test 3
Forward Voltage VF 0.9 V IF = 10mA, TA = +25°C 2
Power Dissipation PD 350 mW Mounted on FR4 PC board with recommended pad layout 2
Thermal Resistance, Junction to Ambient Air RθJA 357 °C/W Mounted on FR4 PC board with recommended pad layout 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: MMBZ5257BQ-7-F
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: mmbz5257bq-7-f-etched.step / mmbz5257bq-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbz5257bq-7-f.step / mmbz5257bq-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 2026-10-23, tier: manufacturer)
  • 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