OPB625

OPB625 is a family of optocouplers (optical isolators). It uses an LED input to optically drive a phototransistor (often a transistor or Darlington output), providing galvanic isolation between the input and output sides. The LED side handles a low-voltage control signal; the phototransistor side switches a separate load, keeping grounds and noise separate. Variants differ in output type, current-transfer ratio (CTR), and isolation voltage, so check the exact part (e.g., OPB625, OPB625A) for precise specs. Common uses include digital signal isolation, level shifting, and isolation in power supplies or microcontroller interfaces. Key specs to verify: forward current (IF), CTR vs IF curves, maximum output current, isolation voltage (Viso), response time, and package/pinout (typically DIP-4). For precise behavior, consult the specific OPB625 datasheet.

OPB625 is a phototransistor-output optocoupler. Common equivalents from other makers include:
- Sharp PC817
- Everlight EL817
- Lite-On LTV-817
- Vishay 4N35 / 4N25
- Vishay CNY17-3
- Avago/Broadcom HCPL-817
- ON Semiconductor 6N137 (high-speed)
Note: verify CTR, isolation voltage, IF, and pinout to ensure true interchangeability.

OPB625 is an optocoupler (OPB625 family) with a LED input and a transistor output. Key features:
- Isolation: up to several kilovolts RMS between input and output
- Output: NPN phototransistor, typically open-collector; requires a pull-up resistor
- Vceo / voltage rating: device dependent (commonly ~30V)
- CTR (current transfer ratio): highly dependent on IF and temperature; typical wide range (e.g., tens to hundreds of percent)
- Input LED: forward current ~5–20 mA; Vf ~1.2 V (approximate)
- Speed: fast switching (turn-on/turn-off in microseconds range, varies by variant)
- Package: DIP-4 (and other variants) with options for through-hole or surface-mount
- Temperature range: typical industrial range (e.g., −40°C to +85°C)
- Applications: digital isolation for microcontrollers, safety and noise isolation in control circuits
Note: exact electrical specs vary by variant (OPB625, OPB625A, etc.). Check the specific datasheet for precise CTR, voltages, and speed.

OPB625 is a 4‑pin optocoupler (DIP-4).
- Pin 1: LED anode
- Pin 2: LED cathode
- Pin 3: Phototransistor emitter
- Pin 4: Phototransistor collector
One side is the input LED, the other side is a phototransistor output.

OPB625 is manufactured by Optek Technology. Optek Technology is a specialized electronics company that designs and manufactures optoelectronic components such as LEDs, photodiodes/phototransistors, infrared emitters/detectors, and optocouplers.

OPB625 is a phototransistor optocoupler used to provide galvanic isolation between circuits.
Typical application areas:
- Microcontroller/logic interface isolation
- Gate drive and switching control for power supplies and motor drives
- Solid-state relay control and signaling isolation
- Data/serial communications isolation (RS-232/RS-485)
- Industrial instrumentation requiring noise immunity
- Medical electronics needing patient/safety isolation

OPB625 uses a DIP-4 through-hole package (4-pin optocoupler).