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1N4740APF

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ST Semtech Zener Diodes, DO-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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1N4740APF

ST Semtech · Zener Diodes · DO-41

1N4740APF 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: 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-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 VZT (min) at IZT VZT 9.5 V at IZT = 25 mA; 1N4740APF (A suffix, ±5%) 3
Zener voltage VZT (max) at IZT VZT 10.5 V at IZT = 25 mA; 1N4740APF (A suffix, ±5%) 3
Zener voltage tolerance (suffix A) -5 5 % suffix A printed on the datasheet for ±5% 1
Dynamic resistance ZZT (max) ZZT 7 Ω at IZT = 25 mA; 60 Hz AC, RMS 10% of IZT (note 1) 3
Dynamic resistance ZZK (max) ZZK 700 Ω at IZK = 0.25 mA (note 1) 3
Reverse current IR (max) IR 10 µA at VR = 7.6 V 3
Forward voltage VF (max) VF 1.2 V at IF = 200 mA 3
Maximum surge current IZSM IZSM 454 mA 1/2 square wave or sine pulse of 1/120 s superimposed on IZT (note 4) 3
Maximum regulator current IZM IZM 91 mA leads at 8 mm from case kept at ambient temperature (note 2) 3
Temperature coefficient of VZ (range) 0.04 0.08 %/℃ printed as range 0.04 to 0.08 %/℃ for this variant 3
Power dissipation Ptot (max) Ptot 1 W Ta = 25℃; leads at 8 mm from case kept at ambient temperature (note 1) 1
Junction temperature Tj (max) Tj 175 ℃ 1
Storage temperature range Tstg Tstg -65 175 ℃ 1
Thermal resistance junction to ambient air (max) RθJA 150 ℃/W leads at 8 mm from case kept at ambient temperature (note 1) 1

CAD (KiCad official)

  • Symbol: 1N4740APF
  • 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 2026-10-15, 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