Explore LM337 pins, signal names, electrical functions and connection guidance for each package.
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Click a lead or use the arrow keys. Front view · marking toward you · ADJ1, IN2, OUT3
The regulator holds OUTPUT approximately 1.25 V below ADJ.
Connect R1 from OUT to ADJ and R2 from ADJ to the common return.
ADJ is not ground. Adjustment current flows into this terminal.
Accepts a negative supply more negative than the required output. The TO-220 tab and SOT-223 tab 4 are also IN.
Connect −9 V in the example; keep the live input tab isolated from grounded metal.
This pin assignment differs from positive LM317/LM350 regulators.
Supplies the load at a controlled negative voltage relative to the common return.
Connect R1, the load and the required output capacitor here.
Polarized output capacitors have their positive end at the common return, not at OUT.
The broad SOT-223 contact is internally connected to input lead 2.
Connect to the negative input copper and provide an adequate thermal path.
This is a separate physical contact on the same IN node; it is not ground.
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