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SZMMBZ5257BLT1G

Public Made by Adom

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

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docs Publish 0.1.0 · Ray 9d ago
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README.md Publish 0.1.0 · Ray 9d ago
szmmbz5257blt1g-etched.glb Publish 0.1.0 · Ray 9d ago
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szmmbz5257blt1g-hero.glb szmmbz5257blt1g: hero GLB from the etched model (keeps the MPN mark) · Ray 9d ago
szmmbz5257blt1g-hero.overlay.json Publish 0.1.0 · Ray 9d ago
szmmbz5257blt1g.glb Publish 0.1.0 · Ray 9d ago
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SZMMBZ5257BLT1G

onsemi · Zener Diodes · SOT-23

SZMMBZ5257BLT1G from onsemi, 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 ANODE passive Anode terminal of the Zener diode; the datasheet pinout is 1-Anode, 2-No Connection, 3-Cathode.
2 NC unconnected No connection; the datasheet specifies no electrical function for this pin.
3 CATHODE passive Cathode terminal of the Zener diode, identified by the polarity band on the package.

Key specifications

Parameter Value
Manufacturer onsemi
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
Peak Power Dissipation (@ TL ≤ 25°C) Ppk 225 W @ 20 s (Note 1), @ TL ≤ 25°C 1
Total Power Dissipation on FR-5 Board (Note 2) PD 225 mW @ TA = 25°C 1
Derating above 25°C, FR-5 Board PD 1.8 mW/°C Derated above 25°C, FR-5 board 1
Thermal Resistance, Junction-to-Ambient, FR-5 Board RJA 556 °C/W FR-5 board (Note 2) 1
Total Power Dissipation on Alumina Substrate (Note 3) PD 300 mW @ TA = 25°C, alumina substrate 1
Derating above 25°C, Alumina Substrate PD 2.4 mW/°C Derated above 25°C, alumina substrate 1
Thermal Resistance, Junction-to-Ambient, Alumina Substrate RJA 417 °C/W Alumina substrate (Note 3) 1
Junction and Storage Temperature Range TJ, Tstg -65 150 °C 1

CAD (KiCad official)

  • Symbol: SZMMBZ5257BLT1G
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: szmmbz5257blt1g-etched.step / szmmbz5257blt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); szmmbz5257blt1g.step / szmmbz5257blt1g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (7 pp, sha256 2d00837373f04706, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-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