Explore LM338T 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, OUT2, IN3
The feedback loop holds OUTPUT approximately 1.24 V above ADJUST.
Connect the junction of R1 from OUTPUT and R2 to the return.
This is not ground; adjustment-pin current contributes IADJ × R2 to output voltage.
Supplies the external load and feedback divider. The metal tab is electrically connected to OUTPUT.
Connect R1 close to this lead and return R2 near the load return.
A grounded heatsink needs appropriate electrical insulation from the live output tab.
Powers the series pass stage.
Use +9 V in the example, with a local 0.1 µF bypass to the common return.
Recommended input-to-output differential is 3–40 V; electrical reference tests use 3–35 V. Allow margin from the 40 V absolute differential limit.
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