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MMSZ5237B-E3-08
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Vishay Intertech Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMSZ5237B-E3-08
Vishay Intertech · Zener Diodes · SOD-123
MMSZ5237B-E3-08 from Vishay Intertech, 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 | K | passive | Cathode, the terminal on the cathode-bar end of the SOD-123 body; it goes positive with respect to the anode in Zener breakdown, and the MMSZ5237 has a nominal VZ of 8.2 V at IZT 20 mA. |
| 2 | A | passive | Anode, the terminal at the end opposite the cathode bar; the maximum forward voltage is 0.9 V at IF = 10 mA, and power dissipation is limited to 500 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Vishay Intertech |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage tolerance (B suffix, MMSZ5237B) | VZ | -5 | 5 | % | Standard tolerance with 'B' suffix (MMSZ5237B); 'C' suffix is ±2 % | 1 | |
| Reverse leakage current | IR | 3 | µA | VR = 6.5 V | 2 | ||
| Dynamic resistance (Zener impedance) | ZZ | 8 | Ω | IZT1 = 20 mA, 1 kHz AC at 10 % of IZT | 2 | ||
| Dynamic resistance at knee (Zener impedance) | ZZK | 500 | Ω | IZT2 = 0.25 mA | 2 | ||
| Forward voltage | VF | 0.9 | V | IF = 10 mA | 2 | ||
| Power dissipation | Ptot | 500 | mW | TL = 75 °C, on FR-4 or FR-5 board with minimum recommended solder pad layout | 1 | ||
| Storage temperature range | Tstg | -65 | 150 | °C | 1 | ||
| Operating temperature range | Top | -55 | 150 | °C | 1 | ||
| Junction temperature | Tj | 150 | °C | 1 | |||
| Thermal resistance junction to ambient air | RthJA | 340 | K/W | On FR-4 or FR-5 board with minimum recommended solder pad layout | 1 | ||
| Nominal Zener voltage | VZ | 8.2 | V | Test current IZT1 = 20 mA | 2 | ||
| Temperature coefficient of Zener voltage | VZ | 0.062 | %/°C | 2 |
CAD (KiCad official)
- Symbol:
MMSZ5237B-E3-08 - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5237b-e3-08-etched.step/mmsz5237b-e3-08-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5237b-e3-08.step/mmsz5237b-e3-08.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Vishay Intertech datasheet (5 pp, sha256
0db5e8fbd2fd4754, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# MMSZ5237B-E3-08
**Vishay Intertech** · Zener Diodes · SOD-123
MMSZ5237B-E3-08 from Vishay Intertech, 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 | K | passive | Cathode, the terminal on the cathode-bar end of the SOD-123 body; it goes positive with respect to the anode in Zener breakdown, and the MMSZ5237 has a nominal VZ of 8.2 V at IZT 20 mA. |
| 2 | A | passive | Anode, the terminal at the end opposite the cathode bar; the maximum forward voltage is 0.9 V at IF = 10 mA, and power dissipation is limited to 500 mW. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Vishay Intertech |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage tolerance (B suffix, MMSZ5237B) | VZ | -5 | | 5 | % | Standard tolerance with 'B' suffix (MMSZ5237B); 'C' suffix is ±2 % | 1 |
| Reverse leakage current | IR | | | 3 | µA | VR = 6.5 V | 2 |
| Dynamic resistance (Zener impedance) | ZZ | | | 8 | Ω | IZT1 = 20 mA, 1 kHz AC at 10 % of IZT | 2 |
| Dynamic resistance at knee (Zener impedance) | ZZK | | | 500 | Ω | IZT2 = 0.25 mA | 2 |
| Forward voltage | VF | | | 0.9 | V | IF = 10 mA | 2 |
| Power dissipation | Ptot | | | 500 | mW | TL = 75 °C, on FR-4 or FR-5 board with minimum recommended solder pad layout | 1 |
| Storage temperature range | Tstg | -65 | | 150 | °C | | 1 |
| Operating temperature range | Top | -55 | | 150 | °C | | 1 |
| Junction temperature | Tj | | | 150 | °C | | 1 |
| Thermal resistance junction to ambient air | RthJA | | | 340 | K/W | On FR-4 or FR-5 board with minimum recommended solder pad layout | 1 |
| Nominal Zener voltage | VZ | | 8.2 | | V | Test current IZT1 = 20 mA | 2 |
| Temperature coefficient of Zener voltage | VZ | | 0.062 | | %/°C | | 2 |
## CAD (KiCad official)
- Symbol: `MMSZ5237B-E3-08`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mmsz5237b-e3-08-etched.step` / `mmsz5237b-e3-08-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsz5237b-e3-08.step` / `mmsz5237b-e3-08.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Vishay Intertech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8763476522282176512) (5 pp, sha256 `0db5e8fbd2fd4754`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/mmsz5237b-e3-08-datasheet.pdf)