component

ZM4738A

Public Made by Adom

by adom

YFW 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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ZM4738A

YFW · Zener Diodes · LL-41

ZM4738A from YFW, 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 YFW
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 nominal VZnom 8.2 V at IZT = 31 mA, tp = 20 ms 2
Zener Voltage tolerance (suffix A) -5 5 % Suffix A 1
Zener Test Current IZT 31 mA 2
Dynamic Resistance ZZT 4.5 Ω at IZT = 31 mA 2
Dynamic Resistance (knee) ZZK 700 Ω at IZK = 0.5 mA 2
Reverse Current IR 10 µA at VR = 6 V 2
Maximum Surge Current IZSM 550 mA Ta = 25 °C 2
Maximum Regulator Current IZM 110 mA Ta = 25 °C 2
Forward Voltage VF 1.2 V at IF = 200 mA 1
Thermal Resistance Junction to Ambient Air RθJA 170 K/W Ta = 25 °C, electrodes kept at ambient temperature 1
Power Dissipation Ptot 1 W Ta = 25 °C, electrodes kept at ambient temperature 1
Junction Temperature Tj 175 °C Ta = 25 °C 1
Storage Temperature Range Tstg -65 175 °C Ta = 25 °C 1

CAD (KiCad official)

  • Symbol: ZM4738A
  • Footprint: Diode_SMD:D_MELF
  • 3D model: LL-41 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: YFW datasheet (3 pp, sha256 ce3cb652985a1703, retrieved 2026-10-22, 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