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ZM4749A

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MSKSEMI Zener Diodes, LL-41. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

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ZM4749A

MSKSEMI · Zener Diodes · LL-41

ZM4749A from MSKSEMI, in a LL-41. 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 MSKSEMI
Package LL-41
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 (suffix A) VZnom -5 5 % Suffix A = ±5% tolerance 2
Maximum dynamic resistance ZZT 25 Ω at IZT = 10.5 mA; 60 Hz AC, RMS 10% of IZT 3
Maximum dynamic resistance (knee) ZZK 750 Ω at IZK = 0.25 mA 3
Maximum reverse current IR 5 µA at VR = 18.2 V 3
Maximum surge current (non-repetitive peak) IZSM 190 mA 1/120 s half-square or sine pulse superimposed on IZT 3
Maximum regulator current IZM 38 mA Ta = 25 ℃ 3
Nominal Zener voltage VZnom 24 V at IZT = 10.5 mA, Ta = 25 ℃ 3
Power dissipation Ptot 1 W Valid provided electrodes are kept at ambient temperature 2
Junction temperature Tj 175 ℃ 2
Storage temperature range Tstg -65 175 ℃ 2
Thermal resistance junction to ambient air RthA 0.3 K/mW Valid provided electrodes are kept at ambient temperature 2
Forward voltage VF 1 V at IF = 100 mA; electrodes kept at ambient temperature 2

CAD (KiCad official)

  • Symbol: ZM4749A
  • Footprint: Diode_SMD:D_MELF
  • 3D model: LL-41 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: MSKSEMI datasheet (5 pp, sha256 2fe699a8fd952775, retrieved 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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