CNY17-3-500E

Introduction to CNY17-3-500E
- Type: a single-channel optocoupler (phototransistor type) in a DIP-4 package, part of the CNY17 family. It provides galvanic isolation between input and output.
- Isolation: designed for high input–output isolation, often around 5 kV RMS between sides (the “500” in 500E). The “E” typically indicates an enhanced/lead-free version; confirm with the datasheet.
- Input: infrared LED. Forward current spec (IF) is typically in the few mA range; max ratings exist, so design within recommended values.
- Output: a phototransistor whose collector-emitter current (IC) is approximately CTR × IF; CTR varies with temperature and IF and is specified over ranges in the datasheet.
- Pinout: standard DIP-4—pins for LED anode/cathode and transistor collector/emitter (pin order depends on variant; verify).
- Applications: microcontroller or logic isolation, interface between low-voltage logic and higher-voltage circuits, power-supply control, and signal isolation.
- Notes: exact CTR, voltage rating, and pinout vary by variant; always consult the specific datasheet for CNY17-3-500E.

Common equivalents to the CNY17-3-500E (phototransistor optocoupler) include: Sharp/Agilent PC817, Everlight LTV-817, Broadcom/Avago 4N25 (or 4N35), and Toshiba TLP521-series. Verify CTR grade, isolation voltage, pinout and package differences before substituting.

CNY17-3-500E features:
- 1-channel optocoupler with transistor output (NPN, Form A)
- DIP-4 through-hole package; lead-free (RoHS)
- Isolation: 5 kV RMS minimum between input and output
- Output: Vceo ≈ 80 V; Ic rated for tens of mA
- CTR: wide range, about 50–600% at If ≈ 5 mA (varies with temperature Ta)
- LED input: If up to ~60 mA; Vf ≈ 1.2–1.4 V at modest If
- Temperature range: -40 to 100°C
- Speed: switching in the microsecond range (rise/fall times a few μs)
- Applications: isolated interfaces for microcontrollers, logic isolation, and isolated control/power supplies
Note: “500E” indicates the part’s high isolation rating (≈5 kV) and lead-free variant.

- Pin count: 4 pins (DIP-4)
- Function: Optocoupler (phototransistor output). Provides galvanic isolation between input LED and output transistor.
- Pin 1: Anode
- Pin 2: Cathode
- Pin 3: Emitter
- Pin 4: Collector

The CNY17-3-500E is manufactured by Vishay (Vishay Intertechnology, Inc.), marketed through its Vishay Semiconductors product line. Vishay is a multinational electronics components company that designs and manufactures discrete semiconductors and passive components (resistors, diodes, optocouplers, power MOSFETs, etc.) and is publicly traded.

Typical application areas for CNY17-3-500E (three-channel optocoupler with transistor outputs):
- Galvanic isolation between low-voltage control circuits (MCUs/PLCs) and high-voltage/noisy sides
- Isolated feedback for switch-mode power supplies and adapters
- Interfaces for sensors and actuators in industrial automation
- Driving small loads such as transistors, relays, and triacs
- Multi-channel isolated signal paths in a single package (three channels)
- Noise immunity and ground-loop protection in instrumentation and telecom
- Data/isolation in measurement, control systems, and safety-critical applications

DIP-6 plastic through-hole package (6-pin) for CNY17-3-500E.