Junction Field Effect Transistor – JFET

 

JFET N Channel J310 depletion mode current source sink circuit learning electronics lesson 0058
JFET N Channel J310 depletion mode current source sink circuit learning electronics lesson 0058

Junction Field Effect Transistors (JFETs) are commonly used as a current source/sink.

Connecting the gate directly to the source provides the Idss, which is the maximum current through that particular JFET.

A resistor between the gate and source will lower the amount of current from the Idss.

JFETs come in N channel and P channel. The J310 is relatively common N channel JFET.

N channel gate arrow points into the component schematic, whereas the P channel JFET schematic symbol points out of the schematic symbol.