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BZX55C39V

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ST Semtech Zener Diodes, DO-35. 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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BZX55C39V

ST Semtech · Zener Diodes · DO-35

BZX55C39V from ST Semtech, in a DO-35. 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 DO-35
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
Power Dissipation Ptot 500 mW leads kept at ambient temperature at 8 mm from case 1
Junction Temperature Tj 175 ℃ 1
Storage Temperature Range Tstg -55 175 ℃ 1
Thermal Resistance Junction to Ambient Air RthA 0.3 K/mW leads kept at ambient temperature at 8 mm from case 1
Forward Voltage VF 1 V IF = 100 mA 1
Dynamic Resistance (BZX55C39) ZZT 90 Ω IZT = 2.5 mA 2
Dynamic Resistance (BZX55C39) ZZK 500 Ω IZK = 0.5 mA 2
Reverse Leakage Current (BZX55C39) IR 0.1 µA Ta = 25℃; VR = 30 V 2
Reverse Leakage Current (BZX55C39) IR 5 µA Ta = 125℃; VR = 30 V 2
Temperature Coefficient of Zener Voltage (BZX55C39) TKvz 0.04 0.12 %/K 2

CAD (KiCad official)

  • Symbol: BZX55C39V
  • Footprint: Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal
  • 3D model: DO-35 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: ST Semtech datasheet (3 pp, sha256 ac153585ca3c9ed5, retrieved 2026-10-16, 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