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MMSZ5249B_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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MMSZ5249B_R1_00001
PANJIT International · Zener Diodes · SOD-123
MMSZ5249B_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 of the zener diode; the 19 V nominal (18.05 V min to 19.95 V max at 6.6 mA) zener voltage of the MMSZ5249B is positive on this pin relative to the anode. |
| 2 | A | passive | Anode of the zener diode, marked as pin 2 in the SOD-123 package drawing. |
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 | VZ | 18.05 | 19 | 19.95 | V | @ IZT = 6.6 mA | 2 |
| Max Zener Impedance | ZZT | 23 | Ω | @ IZT = 6.6 mA | 2 | ||
| Max Zener Impedance (knee) | ZZK | 600 | Ω | @ IZK = 0.25 mA | 2 | ||
| Max Reverse Leakage Current | IR | 0.1 | μA | @ VR = 14 V | 2 | ||
| Total Power Dissipation | PD | 500 | mW | Notes A | 1 | ||
| Typical Thermal Resistance (Notes B) | RθJA | 430 | OC/W | Notes B: FR4 PCB, single-sided copper, mini pad | 1 | ||
| Typical Thermal Resistance (Notes A) | RθJA | 325 | OC/W | Notes A: mounted on 100cm2 (1mm thick) copper areas | 1 | ||
| Operating Junction and Storage Temperature Range | TJ | -55 | 150 | OC | 1 |
CAD (KiCad official)
- Symbol:
MMSZ5249B_R1_00001 - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5249b-r1-00001-etched.step/mmsz5249b-r1-00001-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5249b-r1-00001.step/mmsz5249b-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
14125e00b8f213bf, retrieved 2026-10-22, tier: lcsc) - 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).
# MMSZ5249B_R1_00001
**PANJIT International** · Zener Diodes · SOD-123
MMSZ5249B_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 of the zener diode; the 19 V nominal (18.05 V min to 19.95 V max at 6.6 mA) zener voltage of the MMSZ5249B is positive on this pin relative to the anode. |
| 2 | A | passive | Anode of the zener diode, marked as pin 2 in the SOD-123 package drawing. |
## 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 | VZ | 18.05 | 19 | 19.95 | V | @ IZT = 6.6 mA | 2 |
| Max Zener Impedance | ZZT | | | 23 | Ω | @ IZT = 6.6 mA | 2 |
| Max Zener Impedance (knee) | ZZK | | | 600 | Ω | @ IZK = 0.25 mA | 2 |
| Max Reverse Leakage Current | IR | | | 0.1 | μA | @ VR = 14 V | 2 |
| Total Power Dissipation | PD | | | 500 | mW | Notes A | 1 |
| Typical Thermal Resistance (Notes B) | RθJA | | 430 | | OC/W | Notes B: FR4 PCB, single-sided copper, mini pad | 1 |
| Typical Thermal Resistance (Notes A) | RθJA | | 325 | | OC/W | Notes A: mounted on 100cm2 (1mm thick) copper areas | 1 |
| Operating Junction and Storage Temperature Range | TJ | -55 | | 150 | OC | | 1 |
## CAD (KiCad official)
- Symbol: `MMSZ5249B_R1_00001`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mmsz5249b-r1-00001-etched.step` / `mmsz5249b-r1-00001-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsz5249b-r1-00001.step` / `mmsz5249b-r1-00001.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [PANJIT International datasheet](docs/mmsz5249b-r1-00001-datasheet.pdf) (6 pp, sha256 `14125e00b8f213bf`, retrieved 2026-10-22, tier: lcsc)
- **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/mmsz5249b-r1-00001-datasheet.pdf)