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MM1Z5253B
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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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MM1Z5253B
ST Semtech · Zener Diodes · SOD-123
MM1Z5253B 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, listed as pin 1 in the PINNING table for the SOD-123 package (2-lead surface-mount, total power dissipation max. 500 mW for the device). |
| 2 | ANODE | passive | Anode terminal of the zener diode, listed as pin 2 in the PINNING table and shown on the top view of the SOD-123 outline (forward voltage VF max. 0.9 V at IF = 10 mA). |
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, minimum | VZT | 23.75 | V | at IZT = 5 mA, pulsed 20 ms | 2 | ||
| Zener voltage, maximum | VZT | 26.25 | V | at IZT = 5 mA, pulsed 20 ms | 2 | ||
| Nominal zener voltage | Vznom | 25 | V | 2 | |||
| Zener voltage tolerance | -5 | 5 | % | approximately, per Features | 1 | ||
| Dynamic impedance, max | ZZT | 35 | Ω | at IZT = 5 mA | 2 | ||
| Dynamic impedance knee, max | ZZK | 600 | Ω | at IZK = 0.25 mA, AC 1 kHz, IZ(AC) = 0.1 IZ(DC) | 2 | ||
| Reverse current, max | IR | 0.1 | µA | at VR = 19 V | 2 | ||
| Forward voltage, max | VF | 0.9 | V | at IF = 10 mA | 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:
MM1Z5253B - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mm1z5253b-etched.step/mm1z5253b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mm1z5253b.step/mm1z5253b.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 2026-10-18, 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).
# MM1Z5253B
**ST Semtech** · Zener Diodes · SOD-123
MM1Z5253B 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, listed as pin 1 in the PINNING table for the SOD-123 package (2-lead surface-mount, total power dissipation max. 500 mW for the device). |
| 2 | ANODE | passive | Anode terminal of the zener diode, listed as pin 2 in the PINNING table and shown on the top view of the SOD-123 outline (forward voltage VF max. 0.9 V at IF = 10 mA). |
## 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, minimum | VZT | 23.75 | | | V | at IZT = 5 mA, pulsed 20 ms | 2 |
| Zener voltage, maximum | VZT | | | 26.25 | V | at IZT = 5 mA, pulsed 20 ms | 2 |
| Nominal zener voltage | Vznom | | 25 | | V | | 2 |
| Zener voltage tolerance | | -5 | | 5 | % | approximately, per Features | 1 |
| Dynamic impedance, max | ZZT | | | 35 | Ω | at IZT = 5 mA | 2 |
| Dynamic impedance knee, max | ZZK | | | 600 | Ω | at IZK = 0.25 mA, AC 1 kHz, IZ(AC) = 0.1 IZ(DC) | 2 |
| Reverse current, max | IR | | | 0.1 | µA | at VR = 19 V | 2 |
| Forward voltage, max | VF | | | 0.9 | V | at IF = 10 mA | 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: `MM1Z5253B`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mm1z5253b-etched.step` / `mm1z5253b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm1z5253b.step` / `mm1z5253b.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586185931787276288) (4 pp, sha256 `a80b873003c5c24a`, 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/mm1z5253b-datasheet.pdf)