component
MMSZ5254BT1G
Public Made by Adomby adom
onsemi Zener Diodes, SOD-123. 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
markdownMMSZ5254BT1G
onsemi · Zener Diodes · SOD-123
MMSZ5254BT1G from onsemi, 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 | Cathode | passive | Cathode is identified by the polarity band on the package; the MMSZ5254BT1G regulates in reverse bias with a nominal Zener voltage of 27 V (25.65 V min to 28.35 V max). |
| 2 | Anode | passive | Anode is the terminal opposite the cathode band, and the datasheet gives no separate electrical limit for this pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage @ IZT | VZ | 25.65 | 27 | 28.35 | V | @ IZT = 20 mA; B suffix (5%); TA = 25°C; Notes 3, 4 | 3 |
| Reverse Leakage Current @ VR | IR | 0.1 | µA | @ VR = 21 V | 3 | ||
| Maximum Zener Impedance @ IZT | ZZT | 41 | Ω | @ IZT = 20 mA; IZ(AC) = 0.1 IZ(dc), f = 1 kHz (Note 5) | 3 | ||
| Maximum Zener Impedance @ IZK | ZZK | 600 | Ω | @ IZK = 0.25 mA; IZ(AC) = 0.1 IZ(dc), f = 1 kHz (Note 5) | 3 | ||
| Forward Voltage | VF | 0.9 | V | @ IF = 10 mA (5% table header) | 3 | ||
| Zener voltage tolerance (B suffix) | -5 | 5 | % | Standard tolerance on nominal Zener voltage (Note 3) | 3 | ||
| Total Power Dissipation on FR-5 Board | PD | 500 | mW | On FR-5 Board (Note 1) @ TL = 75°C | 1 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -55 | 150 | °C | 1 | ||
| Thermal Resistance, Junction-to-Ambient | RJA | 340 | °C/W | Note 2 | 1 | ||
| Thermal Resistance, Junction-to-Lead | RJL | 150 | °C/W | Note 2 | 1 |
CAD (KiCad official)
- Symbol:
MMSZ5254BT1G - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5254bt1g-etched.step/mmsz5254bt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5254bt1g.step/mmsz5254bt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (8 pp, sha256
2711e46b01090f07, retrieved 2026-10-22, tier: manufacturer) - 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).