2N6426 NPN Darlington Transistor

The 2N6426 is the standard-gain sibling of the 2N6427 NPN Darlington transistor family, built the same way — an internal two-stage BJT cascade in a single TO-92 package — and sharing the same 40V/1.0A maximum ratings. The Darlington configuration multiplies current gain by combining the hFE of both internal transistors, so a very small base current is enough to fully saturate the output stage.

This makes the 2N6426 well suited to direct logic-level driving of relays, solenoids, small motors, and lamp or LED loads, where a conventional single transistor would need an extra pre-driver stage to reach the same base sensitivity.

1. Darlington-pair construction for very high current gain
2. Collector current rating to 1.0A
3. 40V collector-emitter and collector-base voltage
4. 625mW power dissipation in TO-92 package
5. Can be driven directly from logic-level outputs
6. 12V emitter-base voltage rating
7. -55°C to +150°C junction temperature range