component
SZMMBZ5257BLT1G
Public Made by Adomby adom
onsemi Zener Diodes, SOT-23. 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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README
markdownSZMMBZ5257BLT1G
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);szmmbz5257blt1g.step/szmmbz5257blt1g.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).