component
MM1Z5242B
Public Made by Adomby adom
ST Semtech Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownMM1Z5242B
ST Semtech · Zener Diodes · SOD-123
MM1Z5242B 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 of the Zener diode, marked by the cathode line on the package (the "III" marking), and the PINNING table lists pin 1 as Cathode. |
| 2 | Anode | passive | Anode of the Zener diode, shown as pin 2 in the top-view SOD-123 drawing and opposite the cathode. |
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 (VZT) at IZT | VZT | 11.4 | 12 | 12.6 | V | IZT = 20 mA, pulsed 20 ms; typ = Vznom | 2 |
| Dynamic impedance ZZT | ZZT | 30 | Ω | at IZT = 20 mA | 2 | ||
| Dynamic impedance ZZK | ZZK | 600 | Ω | at IZK = 0.25 mA; IZ(AC) = 0.1 IZ(DC), AC 1 kHz | 2 | ||
| Reverse current | IR | 1 | µA | at VR = 9.1 V | 2 | ||
| Forward voltage | VF | 0.9 | V | at IF = 10 mA | 2 | ||
| Zener voltage tolerance | -5 | 5 | % | approximately ±5% (B suffix) | 1 | ||
| Total power dissipation | Ptot | 500 | mW | TL = 75℃ | 1 | ||
| Junction temperature | Tj | 150 | ℃ | 1 | |||
| Storage temperature range | Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance junction to ambient | RθJA | 340 | ℃/W | mounted on FR-4 PCB 38 × 38 × 1.6 mm, single-sided Cu pad 25 mm² | 1 | ||
| Thermal resistance junction to lead | RθJL | 150 | ℃/W | FR-4 PCB 89 × 38 mm | 1 |
CAD (KiCad official)
- Symbol:
MM1Z5242B - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
mm1z5242b-etched.step/mm1z5242b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mm1z5242b.step/mm1z5242b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST Semtech datasheet (4 pp, sha256
e8140f667cd2bb32, 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).