component
ZMM5242B
Public Made by Adomby adom
JSMSEMI 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
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownZMM5242B
JSMSEMI · Zener Diodes · LL-34
ZMM5242B from JSMSEMI, 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 | JSMSEMI |
| 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 tolerance (B suffix) | VZ | -5 | 5 | % | B suffix (±5%) | 1 | |
| Power dissipation | Ptot | 500 | W | Tamb=75°C (Note 1) | 1 | ||
| Junction temperature | TJ | 175 | °C | 1 | |||
| Storage temperature range | TSTG | -55 | 175 | °C | 1 | ||
| Maximum thermal resistance junction to ambient | RJA | 300 | K/W | Note 1 | 1 | ||
| Maximum zener impedance | ZZT | 30 | Ω | IZT = 20 mA | 2 | ||
| Maximum zener impedance at knee | ZZK | 600 | Ω | 2 | |||
| Maximum reverse leakage current | IR | 1 | µA | VR = 9.1 V | 2 | ||
| Maximum DC zener current | IZM | 38 | mA | 2 | |||
| Nominal zener voltage | VZ | 12 | V | IZT = 20 mA | 2 | ||
| Typical temperature coefficient | ĮVZ | 0.077 | %/°C | 2 |
CAD (KiCad official)
- Symbol:
ZMM5242B - Footprint:
Diode_SMD:D_MiniMELF - 3D model: LL-34 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: JSMSEMI datasheet (3 pp, sha256
25f07f9b57650958, retrieved 2026-10-15, 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).