PC817

@@ -0,0 +1,48 @@+# PC817++**Sharp** · Phototransistor optocoupler · DIP-4++General-purpose photocoupler pairing an infrared LED (IRED) with an NPN phototransistor across a 5.0 kVrms isolation barrier, in a 4-pin DIP package. It transfers a logic signal while keeping the two sides galvanically isolated, protecting an MCU from a high-voltage or noisy domain. Drive the input LED through a series resistor (~10 mA); the output transistor pulls a pulled-up line low. The default cheap isolator for feedback, triggers, and level domains.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | ANODE | passive | Anode of the input-side infrared LED (IRED). Drive with forward current I_F (typical operating 5 mA, absolute max 50 mA DC / 1 A peak, 100 us / 0.001 duty). Forward voltage V_F ~= 1.2 V typ (1.4 V max) at I_F = 20 mA. Use a series resistor to limit current. |+| 2 | CATHODE | passive | Cathode of the input-side infrared LED. Return path for the LED forward current; reverse voltage V_R rated 6 V max. Typically tied to the input-side ground/return. |+| 3 | EMITTER | passive | Emitter of the output-side NPN phototransistor. Usually tied to the output-side ground (common-emitter) or drives a load in common-collector configuration. Rated V_ECO = 6 V. |+| 4 | COLLECTOR | passive | Collector of the output-side NPN phototransistor. Photocurrent flows here when the input LED is driven; conducts to the emitter in proportion to LED current per the CTR (50-600% at I_F = 5 mA, V_CE = 5 V). V_CEO = 80 V, I_C = 50 mA max, V_CE(sat) = 0.1 V typ (0.2 V max) at I_F = 20 mA, I_C = 1 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Phototransistor optocoupler |+| Isolation voltage | 5.0 kVrms |+| Input | Infrared LED (Vf ~1.2 V, IF 50 mA max) |+| Output | NPN phototransistor (VCEO 35 V, IC 50 mA) |+| Current transfer ratio (CTR) | 50-600% (ranked) |+| Isolation | Galvanic input-to-output |+| Package | DIP-4 |+| Body (L×W×H) | 6.5 × 4.6 × 3.5 mm |++## Ordering variants++- `PC817X (DIP-4)`+- `PC817C (DIP-4, CTR rank C)`++## CAD (KiCad official)++- Symbol: `Isolator:PC817`+- Footprint: `Package_DIP:DIP-4_W7.62mm`+- 3D model: DIP-4 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Sharp datasheet](https://www.farnell.com/datasheets/73758.pdf) (15 pp, sha256 `a485f78cde6091c8`, retrieved 2026-08-17, tier: cse)+- **Extractor:** `ds2sf` (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/pc817-datasheet.pdf)

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