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MMSZ5240C
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Changjing Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MMSZ5240C
Changjing · Zener Diodes · SOD-123
MMSZ5240C from Changjing, 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 (marked '-' with the band on the body); the Zener breakdown voltage VZ is 10 V nominal (9.80 to 10.20 V) at IZT = 20 mA, and it conducts reverse current at VZ. |
| 2 | A | passive | Anode (marked '+' on the package drawing); forward voltage is 0.9 V at IF = 10 mA, and power dissipation is limited to 500 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 10 V, MMSZ5240C, code 2F5) | VZ | 9.8 | 10 | 10.2 | V | IZT = 20 mA | 2 |
| Maximum Zener impedance | ZZT | 17 | Ω | IZT = 20 mA | 2 | ||
| Maximum Zener impedance | ZZK | 600 | Ω | IZK = 0.25 mA | 2 | ||
| Maximum reverse current | IR | 3 | µA | VR = 8.0 V | 2 | ||
| Forward voltage | VF | 0.9 | V | IF = 10 mA; tested with pulses, Tp≤1.0 ms (Note 2) | 1 | ||
| Power dissipation | Pd | 500 | mW | Mounted on 1 in² FR-4 board, 2 oz copper, still air, Ta=25 ℃ (Note 1) | 1 | ||
| Operation junction and storage temperature range | TJ,Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance junction to ambient air | RθJA | 250 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
MMSZ5240C - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mmsz5240c-etched.step/mmsz5240c-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmsz5240c.step/mmsz5240c.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (5 pp, sha256
d0ee804c65052055, 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).
# MMSZ5240C
**Changjing** · Zener Diodes · SOD-123
MMSZ5240C from Changjing, 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 (marked '-' with the band on the body); the Zener breakdown voltage VZ is 10 V nominal (9.80 to 10.20 V) at IZT = 20 mA, and it conducts reverse current at VZ. |
| 2 | A | passive | Anode (marked '+' on the package drawing); forward voltage is 0.9 V at IF = 10 mA, and power dissipation is limited to 500 mW. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 10 V, MMSZ5240C, code 2F5) | VZ | 9.8 | 10 | 10.2 | V | IZT = 20 mA | 2 |
| Maximum Zener impedance | ZZT | | | 17 | Ω | IZT = 20 mA | 2 |
| Maximum Zener impedance | ZZK | | | 600 | Ω | IZK = 0.25 mA | 2 |
| Maximum reverse current | IR | | | 3 | µA | VR = 8.0 V | 2 |
| Forward voltage | VF | | | 0.9 | V | IF = 10 mA; tested with pulses, Tp≤1.0 ms (Note 2) | 1 |
| Power dissipation | Pd | | | 500 | mW | Mounted on 1 in² FR-4 board, 2 oz copper, still air, Ta=25 ℃ (Note 1) | 1 |
| Operation junction and storage temperature range | TJ,Tstg | -55 | | 150 | ℃ | | 1 |
| Thermal resistance junction to ambient air | RθJA | | | 250 | ℃/W | | 1 |
## CAD (KiCad official)
- Symbol: `MMSZ5240C`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mmsz5240c-etched.step` / `mmsz5240c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsz5240c.step` / `mmsz5240c.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590920556952690688) (5 pp, sha256 `d0ee804c65052055`, 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/mmsz5240c-datasheet.pdf)