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MMSZ5257B_R1_00001
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PANJIT International Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMSZ5257B_R1_00001
PANJIT International · Zener Diodes · SOD-123
MMSZ5257B_R1_00001 from PANJIT International, 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 terminal of the MMSZ5257B Zener diode (33 V nominal), with the package-level total power dissipation rated at 500 mW and junction/storage range of -55 to +150 °C. The datasheet gives no pin-specific limit for this terminal. |
| 2 | Anode | passive | Anode terminal of the MMSZ5257B Zener diode, with the package-level total power dissipation rated at 500 mW and junction/storage range of -55 to +150 °C. The datasheet gives no pin-specific limit for this terminal. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| 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 (nominal 33 V; min/max window) | VZ | 31.35 | 33 | 34.65 | V | @ IZT 3.8 mA | 2 |
| Max zener impedance | ZZT | 58 | Ω | @ IZT 3.8 mA | 2 | ||
| Max zener impedance (knee) | ZZK | 700 | Ω | @ IZK 0.25 mA | 2 | ||
| Max reverse leakage current | IR | 0.1 | µA | @ VR 25 V | 2 | ||
| Total power dissipation | PD | 500 | mW | Notes A | 1 | ||
| Operating junction and storage temperature range | TJ | -55 | 150 | °C | 1 | ||
| Typical thermal resistance junction-to-ambient | RθJA | 430 | °C/W | Notes A line as printed (mapping to Notes A/B unclear) | 1 | ||
| Typical thermal resistance junction-to-ambient (second value) | RθJA | 325 | °C/W | Second printed value on Notes A/B line (mapping unclear) | 1 |
CAD (KiCad official)
- Symbol:
MMSZ5257B_R1_00001 - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5257b-r1-00001-etched.step/mmsz5257b-r1-00001-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5257b-r1-00001.step/mmsz5257b-r1-00001.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: PANJIT International datasheet (6 pp, sha256
09a2428369877bb1, retrieved 2026-10-18, 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).
# MMSZ5257B_R1_00001
**PANJIT International** · Zener Diodes · SOD-123
MMSZ5257B_R1_00001 from PANJIT International, 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 terminal of the MMSZ5257B Zener diode (33 V nominal), with the package-level total power dissipation rated at 500 mW and junction/storage range of -55 to +150 °C. The datasheet gives no pin-specific limit for this terminal. |
| 2 | Anode | passive | Anode terminal of the MMSZ5257B Zener diode, with the package-level total power dissipation rated at 500 mW and junction/storage range of -55 to +150 °C. The datasheet gives no pin-specific limit for this terminal. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| 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 (nominal 33 V; min/max window) | VZ | 31.35 | 33 | 34.65 | V | @ IZT 3.8 mA | 2 |
| Max zener impedance | ZZT | | | 58 | Ω | @ IZT 3.8 mA | 2 |
| Max zener impedance (knee) | ZZK | | | 700 | Ω | @ IZK 0.25 mA | 2 |
| Max reverse leakage current | IR | | | 0.1 | µA | @ VR 25 V | 2 |
| Total power dissipation | PD | | | 500 | mW | Notes A | 1 |
| Operating junction and storage temperature range | TJ | -55 | | 150 | °C | | 1 |
| Typical thermal resistance junction-to-ambient | RθJA | | 430 | | °C/W | Notes A line as printed (mapping to Notes A/B unclear) | 1 |
| Typical thermal resistance junction-to-ambient (second value) | RθJA | | 325 | | °C/W | Second printed value on Notes A/B line (mapping unclear) | 1 |
## CAD (KiCad official)
- Symbol: `MMSZ5257B_R1_00001`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mmsz5257b-r1-00001-etched.step` / `mmsz5257b-r1-00001-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsz5257b-r1-00001.step` / `mmsz5257b-r1-00001.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [PANJIT International datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588911082752913408) (6 pp, sha256 `09a2428369877bb1`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/mmsz5257b-r1-00001-datasheet.pdf)