component
MM1Z5251B
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ST(Semtech) Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MM1Z5251B
ST(Semtech) · Zener Diodes · SOD-123
MM1Z5251B from ST(Semtech), 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 Zener diode, as listed in the PINNING table for the SOD-123 package. |
| 2 | Anode | passive | Anode terminal of the Zener diode, as listed in the PINNING table for the SOD-123 package. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST(Semtech) |
| 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 (min) | VZT | 20.9 | V | at IZT = 5.6 mA, pulsed 20 ms | 2 | ||
| Zener voltage (max) | VZT | 23.1 | V | at IZT = 5.6 mA, pulsed 20 ms | 2 | ||
| Zener dynamic impedance (max) | ZZT | 29 | Ω | at IZT = 5.6 mA | 2 | ||
| Zener dynamic impedance knee (max) | ZZK | 600 | Ω | at IZK = 0.25 mA | 2 | ||
| Reverse current (max) | IR | 0.1 | µA | at VR = 17 V | 2 | ||
| Forward voltage (max) | VF | 0.9 | V | at IF = 10 mA | 1 | ||
| Nominal Zener voltage | Vznom | 22 | V | 2 | |||
| Zener voltage tolerance | -5 | 5 | % | approximately ±5% | 1 | ||
| Total power dissipation | Ptot | 500 | mW | Ta = 25℃ | 1 | ||
| Junction temperature | Tj | 150 | ℃ | 1 | |||
| Storage temperature range | TStg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance junction to ambient air | RθJA | 350 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
MM1Z5251B - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mm1z5251b-etched.step/mm1z5251b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mm1z5251b.step/mm1z5251b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST(Semtech) datasheet (4 pp, sha256
a80b873003c5c24a, retrieved 2026-10-27, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusoff(skipped (clean text read)), 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).
# MM1Z5251B
**ST(Semtech)** · Zener Diodes · SOD-123
MM1Z5251B from ST(Semtech), 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 Zener diode, as listed in the PINNING table for the SOD-123 package. |
| 2 | Anode | passive | Anode terminal of the Zener diode, as listed in the PINNING table for the SOD-123 package. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST(Semtech) |
| 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 (min) | VZT | 20.9 | | | V | at IZT = 5.6 mA, pulsed 20 ms | 2 |
| Zener voltage (max) | VZT | | | 23.1 | V | at IZT = 5.6 mA, pulsed 20 ms | 2 |
| Zener dynamic impedance (max) | ZZT | | | 29 | Ω | at IZT = 5.6 mA | 2 |
| Zener dynamic impedance knee (max) | ZZK | | | 600 | Ω | at IZK = 0.25 mA | 2 |
| Reverse current (max) | IR | | | 0.1 | µA | at VR = 17 V | 2 |
| Forward voltage (max) | VF | | | 0.9 | V | at IF = 10 mA | 1 |
| Nominal Zener voltage | Vznom | | 22 | | V | | 2 |
| Zener voltage tolerance | | -5 | | 5 | % | approximately ±5% | 1 |
| Total power dissipation | Ptot | | | 500 | mW | Ta = 25℃ | 1 |
| Junction temperature | Tj | | | 150 | ℃ | | 1 |
| Storage temperature range | TStg | -55 | | 150 | ℃ | | 1 |
| Thermal resistance junction to ambient air | RθJA | | | 350 | ℃/W | | 1 |
## CAD (KiCad official)
- Symbol: `MM1Z5251B`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mm1z5251b-etched.step` / `mm1z5251b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm1z5251b.step` / `mm1z5251b.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [ST(Semtech) datasheet](docs/mm1z5251b-datasheet.pdf) (4 pp, sha256 `a80b873003c5c24a`, retrieved 2026-10-27, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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/mm1z5251b-datasheet.pdf)