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SZMMBZ12VALT1G
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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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SZMMBZ12VALT1G
onsemi · Zener Diodes · SOT-23
SZMMBZ12VALT1G 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 | CATHODE 1 | passive | Cathode of the first Zener junction (unidirectional circuit tied to pins 1 and 3), 12 V breakdown (11.40 to 12.60 V at 1.0 mA) with VRWM 8.5 V for the MMBZ12VAL. |
| 2 | CATHODE 2 | passive | Cathode of the second Zener junction (unidirectional circuit tied to pins 2 and 3), 12 V breakdown (11.40 to 12.60 V at 1.0 mA) with VRWM 8.5 V for the MMBZ12VAL. |
| 3 | ANODE | passive | Common anode of both Zener junctions, normally tied to ground, which allows two unidirectional lines or a single bidirectional configuration between pins 1 and 2. |
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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 11.4 | 12 | 12.6 | V | @ IT = 1.0 mA, 5% tolerance | 3 |
| Working Peak Reverse Voltage | VRWM | 8.5 | V | 3 | |||
| Maximum Reverse Leakage Current | IR | 200 | nA | @ VRWM | 3 | ||
| Clamping Voltage | VC | 17 | V | @ IPP = 2.35 A | 3 | ||
| Maximum Reverse Peak Pulse Current | IPP | 2.35 | A | Surge waveform per Figure 6 | 3 | ||
| Forward Voltage | VF | 0.9 | V | @ IF = 10 mA | 3 | ||
| Temperature Coefficient of VBR | VBR | 7.5 | mV/°C | 3 | |||
| Breakdown Voltage Tolerance | -5 | 5 | % | 5% tolerance | 3 | ||
| Peak Power Dissipation | Ppk | 40 | W | @ 1.0 ms, TL ≤ 25°C | 2 | ||
| Total Power Dissipation on FR-5 Board | PD | 225 | mW | @ TA = 25°C | 2 | ||
| Total Power Dissipation on Alumina Substrate | PD | 300 | mW | @ TA = 25°C | 2 | ||
| Thermal Resistance Junction-to-Ambient (FR-5) | RθJA | 556 | °C/W | FR-5 board | 2 | ||
| Thermal Resistance Junction-to-Ambient (Alumina) | RθJA | 417 | °C/W | Alumina substrate | 2 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -55 | 150 | °C | 2 | ||
| Lead Solder Temperature | TL | 260 | °C | 10 second duration | 2 |
CAD (KiCad official)
- Symbol:
SZMMBZ12VALT1G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
szmmbz12valt1g-etched.step/szmmbz12valt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);szmmbz12valt1g.step/szmmbz12valt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (8 pp, sha256
8bffd9396e1983fb, 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).
# SZMMBZ12VALT1G
**onsemi** · Zener Diodes · SOT-23
SZMMBZ12VALT1G 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 | CATHODE 1 | passive | Cathode of the first Zener junction (unidirectional circuit tied to pins 1 and 3), 12 V breakdown (11.40 to 12.60 V at 1.0 mA) with VRWM 8.5 V for the MMBZ12VAL. |
| 2 | CATHODE 2 | passive | Cathode of the second Zener junction (unidirectional circuit tied to pins 2 and 3), 12 V breakdown (11.40 to 12.60 V at 1.0 mA) with VRWM 8.5 V for the MMBZ12VAL. |
| 3 | ANODE | passive | Common anode of both Zener junctions, normally tied to ground, which allows two unidirectional lines or a single bidirectional configuration between pins 1 and 2. |
## 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 11.4 | 12 | 12.6 | V | @ IT = 1.0 mA, 5% tolerance | 3 |
| Working Peak Reverse Voltage | VRWM | | | 8.5 | V | | 3 |
| Maximum Reverse Leakage Current | IR | | | 200 | nA | @ VRWM | 3 |
| Clamping Voltage | VC | | | 17 | V | @ IPP = 2.35 A | 3 |
| Maximum Reverse Peak Pulse Current | IPP | | | 2.35 | A | Surge waveform per Figure 6 | 3 |
| Forward Voltage | VF | | | 0.9 | V | @ IF = 10 mA | 3 |
| Temperature Coefficient of VBR | VBR | | 7.5 | | mV/°C | | 3 |
| Breakdown Voltage Tolerance | | -5 | | 5 | % | 5% tolerance | 3 |
| Peak Power Dissipation | Ppk | | | 40 | W | @ 1.0 ms, TL ≤ 25°C | 2 |
| Total Power Dissipation on FR-5 Board | PD | | | 225 | mW | @ TA = 25°C | 2 |
| Total Power Dissipation on Alumina Substrate | PD | | | 300 | mW | @ TA = 25°C | 2 |
| Thermal Resistance Junction-to-Ambient (FR-5) | RθJA | | 556 | | °C/W | FR-5 board | 2 |
| Thermal Resistance Junction-to-Ambient (Alumina) | RθJA | | 417 | | °C/W | Alumina substrate | 2 |
| Junction and Storage Temperature Range | TJ, Tstg | -55 | | 150 | °C | | 2 |
| Lead Solder Temperature | TL | | | 260 | °C | 10 second duration | 2 |
## CAD (KiCad official)
- Symbol: `SZMMBZ12VALT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `szmmbz12valt1g-etched.step` / `szmmbz12valt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szmmbz12valt1g.step` / `szmmbz12valt1g.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/szmmbz12valt1-d.pdf) (8 pp, sha256 `8bffd9396e1983fb`, 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/szmmbz12valt1g-datasheet.pdf)