Highway 09 Ic Datasheet -

When incorporating the Highway 09 into your next design, pay special attention to input/output capacitor selection, thermal management, and PCB layout. Always refer to the manufacturer-provided datasheet for the exact revision you are using, as minor electrical variations can exist between production batches.

A: Likely due to improper output capacitor ESR. Use a 22µF tantalum or a 10µF ceramic plus 1Ω in series as a test. Ensure capacitor is within 20mm of the VOUT pin. highway 09 ic datasheet

For V_OUT = 9V, choose R1 = 1kΩ (from VOUT to ADJ), R2 = ( (9/1.25) - 1 ) × R1 = 6.2kΩ. Result: V_OUT = 1.25 × (1 + 6.2) = 9.0V. When incorporating the Highway 09 into your next

A: No. The pinout is different. The 7805 has Input-Ground-Output, while the Highway 09 (TO-220) has Input-Ground-Output but note that the tab is also ground. Always check. Use a 22µF tantalum or a 10µF ceramic

A: For output current above 500mA with a voltage drop of more than 5V, yes. Calculate power: P = (VIN – VOUT) × IOUT. If P > 1W, use a heatsink.