7809CT 9V Linear Voltage Regulator (TO-220)

7809CT 9V Linear Voltage Regulator (TO-220) – Technical Specifications:

Module Type – Fixed Linear Voltage Regulator
Output Voltage – 9V DC (Fixed)
Input Voltage – 11V to 25V DC (Recommended range)
Output Current – Up to 1A (with proper heatsinking)
Voltage Dropout – ~2V (typical)
Package Type – TO-220
Output Tolerance – ±4%
Protection Features – Thermal Shutdown, Short-Circuit Protection, Safe Area Protection
Pin Configuration – IN (Input), GND (Ground), OUT (Output)
Series – 78xx Standard Linear Regulator Family

1: This is a fixed 9V regulator from the same 78xx family as the 7805 and 7812 — for stable output, supply at least ~2V higher than the output (11V minimum under load, 12V+ recommended for headroom).

2: As a linear regulator, it dissipates excess input-to-output voltage as heat. Dropping from 12V to 9V at 1A generates noticeable heat — always fit a heatsink for any sustained load above a few hundred mA.

3: Always include input (~0.33µF) and output (~0.1–1µF) capacitors close to the regulator pins to prevent oscillation and reduce noise on the output rail.

4: Built-in thermal shutdown and short-circuit protection are safety nets, not substitutes for proper heatsinking and circuit design under normal operating conditions.

5: Commonly used to derive a clean 9V rail from a 12V supply for guitar pedals, relay coils, and legacy 9V-powered modules.