component
MMBZ5243BLT1G
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
markdownMMBZ5243BLT1G
onsemi · Zener Diodes · SOT-23
MMBZ5243BLT1G 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 gives no pin-specific limits beyond the device ratings (TJ, Tstg −65 to +150 °C; PD 225 mW on FR-5 board). |
| 2 | NC | unconnected | No connection; this pin is not connected internally and is not used in the circuit. |
| 3 | Cathode | passive | Cathode terminal, marked by the polarity band on the package; for MMBZ5243BLT1G, VZ is 12.35 V min to 13.65 V max at IZT 9.5 mA. |
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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 12.35 | 13 | 13.65 | V | @ IZT = 9.5 mA; Note 3: pulse test at TA = 25°C | 3 |
| Maximum Zener Impedance @ IZT | ZZT | 13 | Ω | @ IZT = 9.5 mA | 3 | ||
| Maximum Zener Impedance @ IZK | ZZK | 600 | Ω | @ IZK = 0.25 mA | 3 | ||
| Reverse Leakage Current | IR | 0.5 | µA | @ VR = 9.9 V | 3 | ||
| Forward Voltage | VF | 0.9 | V | @ IF = 10 mA | 3 | ||
| Total Power Dissipation on FR-5 Board | PD | 225 | mW | FR-5 board (Note 1) @ TA = 25°C | 1 | ||
| Total Power Dissipation on Alumina Substrate | PD | 300 | mW | Alumina substrate (Note 2) @ TA = 25°C | 1 | ||
| Thermal Resistance, Junction-to-Ambient (FR-5 Board) | RθJA | 556 | °C/W | FR-5 board (Note 1) | 1 | ||
| Thermal Resistance, Junction-to-Ambient (Alumina Substrate) | RθJA | 417 | °C/W | Alumina substrate (Note 2) | 1 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
MMBZ5243BLT1G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbz5243blt1g-etched.step/mmbz5243blt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbz5243blt1g.step/mmbz5243blt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
bdbb8fa2d7f751fd, retrieved 2026-10-19, 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).