Pinagem

Pinagem Regulador ajustável LM317 (TO-220)

Pinos

1 ADJ (left, facing the label)
2 VOUT (middle — also the tab)
3 VIN (right)
VOUT = 1.25V × (1 + R2/R1); pinout differs from the 7805 — do not swap them blindly

Output voltage	1.25–37 V, set by two resistors
Output formula	Vout = 1.25 V × (1 + R2/R1); R1 typically 240 Ω
Input–output differential	3–40 V recommended
Output current	Up to 1.5 A with adequate heatsinking
Reference voltage	1.25 V typ (1.2–1.3 V)
ADJ pin current	≈ 50 µA typ
Minimum load current	≈ 3.5 mA typ, 10 mA max (R1 usually provides it)
Protection	Current limit, thermal shutdown, safe-area protection
Operating junction temperature	0–125 °C
Encapsulamento	TO-220 (also TO-92 LM317L at 100 mA, D2PAK, SOT-223)

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