component
ZMM5249BPF
Public Made by Adomby adom
ST(Semtech) Zener Diodes, LL-34. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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
markdownZMM5249BPF
ST(Semtech) · Zener Diodes · LL-34
ZMM5249BPF from ST(Semtech), in a LL-34. 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST(Semtech) |
| Package | LL-34 |
| 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) | VZnom | 19 | V | 4 | |||
| Zener Voltage Range | VZT | 18.05 | 19.95 | V | at IZT = 6.6 mA, tested with pulses tp = 20 ms | 4 | |
| Zener Test Current | IZT | 6.6 | mA | 4 | |||
| Dynamic Resistance | ZZT | 23 | Ω | at IZT = 6.6 mA | 4 | ||
| Dynamic Resistance (knee) | ZZK | 600 | Ω | at IZK = 0.25 mA | 4 | ||
| Reverse Current | IR | 0.1 | µA | at VR = 14 V | 4 | ||
| Forward Voltage | VF | 1.1 | V | IF = 200 mA, Ta = 25℃ | 2 | ||
| Zener Voltage Tolerance | -5 | 5 | % | suffix B | 1 | ||
| Power Dissipation | Ptot | 500 | mW | Ta = 25℃, electrodes kept at ambient temperature | 1 | ||
| Junction Temperature | Tj | 175 | ℃ | Ta = 25℃ | 1 | ||
| Storage Temperature Range | Tstg | -65 | 175 | ℃ | Ta = 25℃ | 1 | |
| Thermal Resistance Junction to Ambient | RθJA | 300 | ℃/W | electrodes kept at ambient temperature | 1 |
CAD (KiCad official)
- Symbol:
ZMM5249BPF - Footprint:
Diode_SMD:D_MiniMELF - 3D model: LL-34 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST(Semtech) datasheet (6 pp, sha256
3a203cb42731a600, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).