Description: The TOSHIBA TLP521− 1, − 2 and − 4 consist of a photo− transistor
optically coupled to a gallium arsenide infrared emitting diode.
The TLP521− 2 offers two isolated channels in an eight lead plastic DIP
package, while the TLP521− 4 provides four isolated channels in a
sixteen plastic DIP package.
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TLP521-4.pdf