component
1N4740APF
Public Made by Adomby adom
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.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdown1N4740APF
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, primarycathode-band convention(convention), consensusoff(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).