Digital Logic Ground Isolation
Line Receiver
Microprocessor System Interfaces
Switching Power Supply Feedback Control
Transistor Inverter 

The TOSHIBA TLP559 consists of a GaAℓAs high−output light emitting diode and a high speed detector of one chip photo diode−transistor. This unit is 8−lead DIP package.
TLP559 has no internal base connection, and a faraday shield integrated on the photodetector chip provides an effective common mode noise transient immunity.
​​​​​​​So this is suitable for application in noisy environmental condition.

•  Isolation voltage: 2500Vrms (min.)
•  Switching speed: tpHL = 0.3μs (typ.)
                                tpLH = 0.5μs (typ.) (RL= 1.9kΩ)
•  TTL compatible
•  UL recognized: UL1577, file No.E67349