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• A dual version of NE556 consists of two precision timers that operate in both monostable and astable modes.
• It is specified for operation from 4.5 V to 16 V.
• TTL compatible output which can source or sink current of up to 150mA.
• Adjustable duty cycle.
• It can produce a timing delay from microseconds to hours.
• The operating temperature range is from 0 to 70 degrees Celsius.
• It has temperature stability better than 0.005% per C.

Optocoupler 817 QUAD contains an IRED optically coupled to a phototransistor. It is packaged in a 4pin DIP, available in wide-lead spacing option and SMT gullwing lead-form option. Input-output isolation voltage(rms) is 5.0kV. Collector-emitter voltage is 80V(*) and CTR is 50% to 600% at input current of 5mA.