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SZMMBZ5243BLT1G
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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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SZMMBZ5243BLT1G
onsemi · Zener Diodes · SOT-23
SZMMBZ5243BLT1G 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 of the Zener diode; the Zener voltage VZ for the MMBZ5243B is 12.35 V min, 13 V nom, 13.65 V max at IZT = 9.5 mA, measured with this pin as the anode. |
| 2 | NC | unconnected | No connection (Style 8 pinout: 1-Anode, 2-No Connection, 3-Cathode). |
| 3 | Cathode | passive | Cathode of the Zener diode, indicated by the polarity band; the datasheet gives a leakage of 0.5 µA max at VR = 9.9 V. |
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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage | VZ | 12.35 | 13 | 13.65 | V | @ IZT = 9.5 mA, TA = 25°C | 3 |
| Zener Test Current | IZT | 9.5 | mA | Zener voltage test current | 3 | ||
| Zener Impedance | ZZT | 13 | Ω | @ IZT = 9.5 mA | 3 | ||
| Zener Impedance | 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, all types | 3 | ||
| Total Power Dissipation on FR-5 Board | PD | 225 | mW | TA = 25°C, Note 1 | 1 | ||
| Derating above 25°C (FR-5) | PD | 1.8 | mW/°C | Derated above 25°C, FR-5 | 1 | ||
| Total Power Dissipation on Alumina Substrate | PD | 300 | mW | TA = 25°C, Note 2 | 1 | ||
| Derating above 25°C (Alumina) | PD | 2.4 | mW/°C | Derated above 25°C, alumina | 1 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance, Junction-to-Ambient (FR-5) | RJA | 556 | °C/W | Note 1, FR-5 board | 1 | ||
| Thermal Resistance, Junction-to-Ambient (Alumina) | RJA | 417 | °C/W | Note 2, alumina substrate | 1 |
CAD (KiCad official)
- Symbol:
SZMMBZ5243BLT1G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
szmmbz5243blt1g-etched.step/szmmbz5243blt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);szmmbz5243blt1g.step/szmmbz5243blt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (7 pp, sha256
17d1d436c4fa25f3, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# SZMMBZ5243BLT1G
**onsemi** · Zener Diodes · SOT-23
SZMMBZ5243BLT1G 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 of the Zener diode; the Zener voltage VZ for the MMBZ5243B is 12.35 V min, 13 V nom, 13.65 V max at IZT = 9.5 mA, measured with this pin as the anode. |
| 2 | NC | unconnected | No connection (Style 8 pinout: 1-Anode, 2-No Connection, 3-Cathode). |
| 3 | Cathode | passive | Cathode of the Zener diode, indicated by the polarity band; the datasheet gives a leakage of 0.5 µA max at VR = 9.9 V. |
## 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage | VZ | 12.35 | 13 | 13.65 | V | @ IZT = 9.5 mA, TA = 25°C | 3 |
| Zener Test Current | IZT | | 9.5 | | mA | Zener voltage test current | 3 |
| Zener Impedance | ZZT | | | 13 | Ω | @ IZT = 9.5 mA | 3 |
| Zener Impedance | 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, all types | 3 |
| Total Power Dissipation on FR-5 Board | PD | | | 225 | mW | TA = 25°C, Note 1 | 1 |
| Derating above 25°C (FR-5) | PD | | | 1.8 | mW/°C | Derated above 25°C, FR-5 | 1 |
| Total Power Dissipation on Alumina Substrate | PD | | | 300 | mW | TA = 25°C, Note 2 | 1 |
| Derating above 25°C (Alumina) | PD | | | 2.4 | mW/°C | Derated above 25°C, alumina | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Thermal Resistance, Junction-to-Ambient (FR-5) | RJA | | | 556 | °C/W | Note 1, FR-5 board | 1 |
| Thermal Resistance, Junction-to-Ambient (Alumina) | RJA | | | 417 | °C/W | Note 2, alumina substrate | 1 |
## CAD (KiCad official)
- Symbol: `SZMMBZ5243BLT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `szmmbz5243blt1g-etched.step` / `szmmbz5243blt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szmmbz5243blt1g.step` / `szmmbz5243blt1g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/szmmbz5243blt1-d.pdf) (7 pp, sha256 `17d1d436c4fa25f3`, retrieved 2026-10-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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](docs/szmmbz5243blt1g-datasheet.pdf)