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DL5231B

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YONGYUTAI Zener Diodes, LL-34. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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DL5231B

YONGYUTAI · Zener Diodes · LL-34

DL5231B from YONGYUTAI, 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 terminal, marked by the color band on the MINI MELF glass body; Zener voltage for DL5231B is 5.1 V nominal at IZT=20 mA.
2 A passive Anode terminal at the end opposite the color band; maximum power dissipation is 500 mW at Tamb=25 C.

Key specifications

Parameter Value
Manufacturer YONGYUTAI
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
Nominal Zener Voltage tolerance (suffix B) Vz -5 5 % Suffix B indicates ±5% tolerance 2
Power Dissipation Ptot 500 mW Tamb=25 C (Note 1) 1
Junction Temperature Tj 200 C 1
Storage Temperature Range TSTG -65 200 C 1
Thermal resistance junction ambient RθJA 0.3 K/mW Note 1 1
Forward voltage VF 1.1 V IF=200mA 1
Maximum Zener Impedance ZZT 17 Ohms @IZT 2
Maximum Zener Impedance ZZK 1600 Ohms IZK=0.25mA 2
Maximum Reverse Leakage Current IR 5 µA @VR=2.0 V 2
Maximum Regulator Current IZM 89 mA 2
Nominal Zener Voltage Vz 5.1 V @IZT=20mA 2
Test Current IZT 20 mA 2
Typical Temperature Coefficient 0.03 %/ C 2

CAD (KiCad official)

  • Symbol: DL5231B
  • Footprint: Diode_SMD:D_MiniMELF
  • 3D model: LL-34 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: YONGYUTAI datasheet (3 pp, sha256 d741924a98eeecea, retrieved 2026-10-23, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-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).

Datasheet PDF