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1N4739APF

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ST(Semtech) Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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1N4739APF

ST(Semtech) · Zener Diodes · DO-41

1N4739APF from ST(Semtech), in a DO-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, marked by the cathode band on the glass DO-41 case; the zener (reverse breakdown) voltage of 9.1 V nominal (8.65 V min to 9.56 V max at IZT = 28 mA) is regulated with this terminal positive relative to the anode.
2 A passive Anode, the unbanded lead of the DO-41 case; forward voltage is max 1.2 V at IF = 200 mA.

Key specifications

Parameter Value
Manufacturer ST(Semtech)
Package DO-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 Range (A suffix, ±5%) VZT 8.65 9.1 9.56 V at IZT = 28 mA, Ta=25℃, tp = 20 ms 3
Dynamic Resistance ZZT 5 Ω at IZT = 28 mA 3
Dynamic Resistance (knee) ZZK 700 Ω at IZK = 0.5 mA 3
Reverse Current IR 10 µA at VR = 7 V 3
Maximum Surge Current IZSM 500 mA 1/2 square wave or equivalent sine wave pulse of 1/120 second superimposed on IZT 3
Maximum Regulator Current IZM 100 mA leads at 8 mm from case kept at ambient temperature 3
Forward Voltage VF 1.2 V IF = 200 mA 2
Temperature coefficient 0.035 0.075 %/℃ at IZT 3
Zener voltage tolerance (A suffix) -5 5 % suffix A 1
Power Dissipation Ptot 1 W Ta = 25℃, leads at 8 mm from case kept at ambient temperature 1
Junction Temperature Tj 175 ℃ Ta = 25℃ 1
Storage Temperature Range Tstg -65 175 ℃ Ta = 25℃ 1
Thermal Resistance Junction to Ambient Air RθJA 150 ℃/W leads at 8 mm from case kept at ambient temperature 1

CAD (KiCad official)

  • Symbol: 1N4739APF
  • Footprint: Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal
  • 3D model: DO-41 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: ST(Semtech) datasheet (5 pp, sha256 dd71dcfee8108242, retrieved 2026-10-24, 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