component
1S2638
Public Made by Adomby adom
ST(Semtech) Diodes - Variable Capacitance, 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.
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
markdown1S2638
ST(Semtech) · Diodes - Variable Capacitance · DO-35
1S2638 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 |
|---|---|---|---|---|---|---|---|
| Reverse current | IR | 5 | µA | at VR = 10 V | 1 | ||
| Nominal capacitance | C | 5 | 20 | pF | at VR = 4 V, f = 1 MHz | 1 | |
| Q (quality factor) | Q | 50 | at VR = 4 V, f = 100 MHz | 1 | |||
| Breakdown voltage | BV | 10 | V | 1 | |||
| Forward current | IF | 250 | mA | 1 | |||
| Power dissipation | PD | 350 | mW | 1 | |||
| Operating temperature range | Topr | -65 | 175 | °C | 1 | ||
| Storage temperature range | Tstg | -65 | 200 | °C | 1 |
CAD (KiCad official)
- Symbol:
1S2638 - 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 (2 pp, sha256
646e631b68024eb0, retrieved 2026-10-21, tier: manufacturer) - 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).