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1N4757APF
Public Made by Adomby adom
ST(Semtech) Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown1N4757APF
ST(Semtech) · Zener Diodes · DO-41
1N4757APF 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 DO-41 glass case; the zener (breakdown) side, which is positive relative to the anode in regulation, with 51 V nominal (48.45 to 53.55 V) at IZT = 5 mA for the A-suffix part. |
| 2 | A | passive | Anode, the lead opposite the cathode band on the DO-41 glass case; forward VF 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 | VZT | 48.45 | 51 | 53.55 | V | at IZT = 5 mA, Ta = 25℃, tp = 20 ms | 3 |
| Zener Test Current | IZT | 5 | mA | Ta = 25℃ | 3 | ||
| Dynamic Resistance | ZZT | 95 | Ω | at IZT | 3 | ||
| Dynamic Resistance (knee) | ZZK | 1500 | Ω | at IZK = 0.25 mA | 3 | ||
| Reverse Current | IR | 5 | µA | at VR = 38.8 V | 3 | ||
| Maximum Surge Current | IZSM | 90 | mA | 1/2 square wave or equivalent sine wave pulse of 1/120 second superimposed on IZT | 3 | ||
| Maximum Regulator Current | IZM | 18 | mA | leads at 8 mm from case kept at ambient temperature | 3 | ||
| Temperature coefficient of Zener voltage | 0.06 | 0.095 | %/℃ | at IZT | 3 | ||
| Forward Voltage | VF | 1.2 | V | IF = 200 mA | 3 | ||
| 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 | ||
| Zener Voltage Tolerance | -5 | 5 | % | suffix A | 1 |
CAD (KiCad official)
- Symbol:
1N4757APF - 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
7a466624e3746c12, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).