🔋💻 ASUS Barrel 45W Laptop Charger
 
(19V 2.37A AC Adapter • 45W • 4.0mm × 1.35mm Barrel Connector)

This compact AC adapter delivers 45W of regulated DC power to ASUS laptops using the slim 4.0mm × 1.35mm barrel connector. It’s the standard supply for ASUS ultrabooks, 2‑in‑1s, and Chromebooks, prized for its portability and efficiency.
 
🔧 Charger Form
Input: 100–240V AC, 50/60Hz
Output: 19V DC, 2.37A (45W)
Connector: 4.0mm outer / 1.35mm inner barrel, no center pin
Lightweight, travel‑friendly brick design
Often labeled as ADP‑45BW, ADP‑45AW, or equivalent
 
🖥️ Compatible Devices
🌟 ZenBook Series: UX21A, UX31A, UX303, UX305, UX330, UX331, UX360, UX370; ZenBook Flip UX360CA, UX370UA
📘 VivoBook Series: X200CA, X200MA, X201E, X202E, X540S/SA/LA, X541N/NA; S200E, S300, S400, S500; E202, E402, E502, F402, F502; VivoBook S13, S14, S15 (low‑power configs)
🔄 Q‑Series / Convertibles: Q200E, Q302L/LA/UA, Q303, Q304, Q502LA, Q503UA, Q504, Q553
🧳 Transformer Book Series: T100, T200, T300 (barrel input versions)
💻 EeeBook Series: X205TA, E202SA, E502MA
🖥️ Chromebooks: C200, C201, C202, C202SA, C300, C300SA, C301
 
✅ Common Uses
🔌 Powering ASUS ultrabooks, convertibles, and Chromebooks
🧩 Replacing lost or damaged OEM chargers
🏢 Standardizing spares for IT support of ASUS fleets
🎒 Keeping as a lightweight travel adapter
🧪 Testing ASUS laptops with a known‑good 45W supply
 
🧠 Signal Format
⚡ Input: Universal AC (100–240V)
🔋 Output: Regulated 19V DC, 45W max
🔌 No center pin — relies on barrel contact only
🔁 Backward compatible with some 33W laptops (safe, charges faster)
 
⚠️ Things to Watch Out For
📉 Not suitable for ASUS ROG or TUF gaming laptops (require 90W–230W)
🔌 Connector must match — not interchangeable with ASUS’s larger 5.5mm × 2.5mm barrel or USB‑C chargers
🧯 Avoid third‑party clones with poor contact — may cause intermittent charging
🌀 Excess heat or frayed cables can cause power dropouts
🧪 Always confirm connector type and wattage before swapping adapters
 
🛠️ Quick Tips for Beginners
🧭 Check underside of laptop or original charger for voltage and connector size
🔌 Use only with laptops rated for 45W and 4.0mm × 1.35mm input
🧪 If laptop reports “adapter not recognized,” inspect barrel contact and cable integrity
🧯 Label adapters clearly to avoid mix‑ups with larger ASUS chargers
🧵 Keep one at desk and one in travel bag for convenience