🔋💻 HP 19.5V 120W Laptop Charger
 
(19.5V 6.15A AC Adapter • 120W • 7.4 mm × 5.0 mm Barrel Connector • With Center Pin)

This smart AC adapter delivers 120W of regulated DC power to HP systems using the 7.4 mm × 5.0 mm barrel connector with center pin. It was HP’s standard high‑power supply for laptops with discrete GPUs, docking stations, and compact desktops.
 
🔧 Charger Form
Input: 100–240V AC, 50/60Hz
Output: 19.5V DC, 6.15A (120W)
Connector: 7.4 mm outer / 5.0 mm inner barrel with center pin
Inline power brick with detachable AC cord
Common part numbers:
HSTNN-LA25, HSTNN-CA25, HSTNN-DA25
613154-001, 644699-003, 645156-001
677762-001, 693709-001, 699935-001
709984-003, 710415-001, 730982-001, 906329-001
L56786-001, ADP-120MH B, A120A05DL
 
🖥️ Compatible Devices
🟨 HP EliteBook Series
8460p, 8470p
8530p, 8530w
8540p, 8540w
8560p, 8560w
8730w, 8770w
🟨 HP ZBook Series
ZBook 15 G1–G4
ZBook 17 G1–G4
ZBook Studio G3, G4
🟨 HP Envy Series
Envy 15, Envy 17
Envy TouchSmart 15, 17
🟨 HP Omen Series
Omen 15, Omen 17 (barrel input configs)
🟨 HP Pavilion Series
Pavilion 15, 17 (quad-core or discrete GPU configs)
Pavilion 24, 27 All-in-One
🟨 HP TouchSmart / AIO Systems
TouchSmart 610, 9300
Pavilion AIO 24-x030, 27-xa100
🟨 HP Business Desktops
DC7800, DC7900
Elite 8000, Elite 8200
EliteDesk 800 G1, G2 (barrel input variants)
🟨 HP Thunderbolt Docks
Thunderbolt Dock G2 (barrel input variant)
HP Advanced Docking Station (EliteBook/ZBook compatible)
 
✅ Common Uses
🔌 Powering HP laptops with discrete GPUs and 17" displays
🧩 Replacing lost or damaged OEM 120W adapters
🏢 Standardizing spares for HP workstation fleets
🎒 Keeping as a travel adapter for high‑power systems
🧪 Powering Thunderbolt Docks and compact desktops with barrel input
 
🧠 Signal Format
⚡ Input: Universal AC (100–240V)
🔋 Output: Regulated 19.5V DC, 120W max
🔌 Center pin provides ID signal for adapter recognition
🔁 Backward compatible with 90W HP laptops (safe, charges faster)
 
⚠️ Things to Watch Out For
📉 Not suitable for HP USB‑C powered laptops
🔌 Connector must match — not interchangeable with HP’s 4.5 mm × 3.0 mm blue‑tip barrel
🧯 Avoid third‑party clones with weak center pins — may cause “adapter not recognized” errors
🌀 Excess heat or frayed cables can cause intermittent charging
🧪 Always confirm laptop’s required wattage before swapping adapters
 
🛠️ Quick Tips for Beginners
🧭 Check underside of laptop or dock for voltage and connector size
🔌 Use only with systems rated for 120W and 7.4 mm × 5.0 mm input
🧪 If system reports “adapter not recognized,” inspect center pin and barrel contact
🧯 Label adapters clearly to avoid mix‑ups with slim‑tip or USB‑C chargers
🧵 Keep one at desk and one in travel bag for convenience