HCPL-817
HCPL-817是安华高的光电耦合器，最早是HP公司产品，后来划分到HP子公司AGILENT，现在AGILENT又将器件独立出来，这个新公司就是AVAGO，AGILENT专心做仪器了，呵呵:)
Phototransistor Optocoupler High Density Mounting Type
Description
The HCPL-817 contains a light emitting diode optically coupled to a phototransistor. It is packaged in a 4-pin DIP package and available in wide-lead spacing option and lead bend SMD option. Input-output isolation voltage is 5000 Vrms. Response time, tr, is typically 4 μs and minimum CTR is 50% at input current of 5 mA.

Features
Current Transfer Ratio
(CTR: min. 50% at IF = 5 mA, VCE = 5 V)
High input-output isolation voltage (Viso = 5000 Vrms)
Response time
(tr: typ., 4 μs at VCE = 2 V, IC = 2 mA, RL = 100 Ω)
Compact dual-in-line package
UL approved
CSA approved
IEC/EN/DIN EN 60747-5-2 approved
Options available: – Leads with 0.4" (10.16 mm) spacing (W00) – Leads bends for surface mounting (300)
– Tape and reel for SMD (500) – IEC/EN/DIN EN 60747-5-2 approvals (060)

Applications
Signal transmission between circuits of different potentials and impedances
I/O interfaces for computers
Feedback circuit in power supply