MMBT6427 – High Gain NPN Darlington, 40 V/1.2 A

The MMBT6427 is an NPN Darlington transistor designed for demanding switching applications. With a maximum collector-emitter voltage of 40 V and continuous collector current up to 1.2 A, it provides robust performance. Its SOT-23 surface-mount package keeps board space minimal while delivering high current gain (hFE values often exceed 10,000). The device’s low saturation voltage and high amplification make the MMBT6427 suitable for drivers, relay control, and general purpose amplification tasks. Although now marked as obsolete by the manufacturer, it remains a reliable choice in legacy designs. Interested in sourcing the MMBT6427? Contact us today.