H11B815 optocouplers equivalent, 4-pin photodarlington optocouplers.
* Compact 4-pin package
* Current Transfer Ratio: 600% minimum (at IF = 1 mA)
* High isolation voltage between input and output (5300 VRMS)
* UL recognize.
* Power Supply Monitors
* Relay Contact Monitor
* Telephone/Telegraph Line Receiver
* Twisted Pair Line .
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