Question:
Can I drive a relay with a transistor?
Answer:
DC coil relays can be driven by transistors.
However, the back electromotive force generated by the coil when it’s turned off may cause damage to the semiconductor or device malfunction. As a countermeasure, add a surge-absorbing circuit to both ends of the coil.
Explanation:
For more about protecting relay coils from surge, refer to FAQE10041“What are surge countermeasures in coil relays?” and Safty Precautions for All Relays: 2-2-5 Preventing Surges When the Coil Is Turned OFF.
Quick tips:
If a surge-absorbing circuit is added, the relay release time will be longer. Check the circuit before use.
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Relays | Digi-Key Electronics
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