opto isolator - Optocoupler with phototransistor base lead - Electrical Engineering Stack Exchange
Juried Engineering Lite-On 4N25 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 20): Amazon.com: Industrial & Scientific
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Lite-On 4N25 Optocoupler Phototransistor Output with Base Connection Breadboard-Friendly IC DIP-6 Pack of 50: Amazon.com: Industrial & Scientific
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Juried Engineering H11AA1M H11AA1 DIP-6 Through Hole AC Input Phototransistor Base DC Output Optocoupler 6-Pin Breadboard-Friendly IC (Pack of 20): Amazon.com: Industrial & Scientific
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Juried Engineering 4N26 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 10): Amazon.com: Industrial & Scientific