💻🔌 HP/Compaq 18.5V 6.5A Power Adapter
 
(18.5V DC • 6.5A • 120W • Rectangular 3‑Prong DC Connector)

This adapter delivers 120W of regulated DC power for select HP Pavilion and Compaq Presario notebooks. It uses a rectangular 3‑prong DC connector, not interchangeable with HP’s later 7.4 mm barrel “smart‑pin” adapters.
 
🔧 Charger Form
Input: 100–240V AC, 50/60Hz
Output: 18.5V DC @ 6.5A (120W)
Connector: Rectangular 3‑prong DC plug (flat housing with 3 metal contacts)
Common part numbers: 394211‑001, 375126‑001, PA‑1121‑12HD
OEM spec: High‑wattage adapter for HP/Compaq desktop‑replacement notebooks
 
🖥️ Compatible Devices
🟦 HP Pavilion Series
Pavilion ZD8000
Pavilion ZV6000
Pavilion ZV6100
🟦 Compaq Presario Series
Presario R4000, R4100, R4200
Presario X6000
🟦 Compaq Business Notebook Series
Business Notebook NX9600
 
✅ Common Uses
🔌 Powering HP Pavilion ZD/ZV series and Compaq Presario R/X series
🧩 Replacing lost or damaged OEM 394211‑001 / 375126‑001 adapters
🧵 Essential entry for HP/Compaq’s transitional 3‑prong DC ecosystem
 
🧠 Signal Format
⚡ Input: Universal AC (100–240V)
🔋 Output: Regulated 18.5V DC, 6.5A
🔌 Connector: Rectangular 3‑prong DC plug
🔁 Not interchangeable with 7.4 mm barrel or 4‑pin DIN adapters
 
⚠️ Things to Watch Out For
📉 Must be 18.5V — 19.5V adapters may damage these systems
🔌 Connector is rectangular 3‑prong — won’t fit barrel or DIN jacks
🧯 Always confirm “DC IN 18.5V” and connector shape before substitution
📏 Some docking stations used different pinouts — verify before mixing adapters
 
🛠️ Quick Tips for Beginners
🧭 Look for “DC IN 18.5V” near the notebook’s power jack
🔌 Confirm connector: rectangular 3‑prong, not barrel
🧪 If system won’t power on, inspect prongs for corrosion or misalignment
🧯 Label clearly to avoid mix‑ups with HP’s later barrel adapters
🧵 Keep this entry in your HP/Compaq legacy power catalog