Head-to-head · Buying from scratch
25W or 45W Samsung: which one to buy when you own neither.
Galaxy phones ship without an adapter, so this is a purchase decision. Judged on price per watt and on everything else in your bag with a USB-C port, the answer leans harder toward 45W than the phone spec alone implies.
Spec-by-spec, from a standing start
| Buying criterion | 25W adapter | 45W adapter |
|---|---|---|
| Cost per watt | Higher — small adapters carry fixed costs | Lower — 80% more watts for a fraction more outlay |
| Fixed PD rails | 5V, 9V, 15V class | 5V, 9V, 15V, 20V class |
| PPS window | Narrower, still triggers Super Fast Charging | Wide — required for Super Fast Charging 2.0 |
| Nintendo Switch docked (15V/2.6A) | No — cannot supply 39W | Yes |
| Steam Deck (45W) | No | Yes |
| Size / weight class | Pocketable | Larger, still one-hand small |
Match the adapter to the handset first
Samsung splits its own range at a clean line. Galaxy S Ultra, S Plus and the Tab S tablets negotiate up to 45W; base Galaxy S models, the A-series and the Z Fold and Flip families stop at 25W. Buy strictly on the phone and the smaller adapter is correct for the majority of Galaxy owners. What complicates that is PPS: both tiers need it, and a generic USB-C charger without PPS drops a Galaxy to around 15W whatever it advertises. That is the usual reason a new charger feels slower than the old one, explained in full on the Super Fast Charging page.
Then count everything else with a USB-C port
An adapter is not a phone accessory, it is an outlet. The 45W unit has a 20V rail, which is the boundary between "phone charger" and "small laptop charger" — it will run a Chromebook, top up an iPad Pro at full rate, power a docked Nintendo Switch at 15V/2.6A, and satisfy a Steam Deck's 45W request. The 25W unit does none of those. The price gap between the tiers is small while the capability gap is categorical, so the 45W wins on cost per watt for anyone whose desk holds more than a phone. Third-party options are covered under 45W adapters.
Verdict
Buy the 45W. For a first charger bought new, the extra outlay is small, the 20V rail turns a phone accessory into a universal one, and the bundled 5A cable removes the cable question entirely. Even on a handset that caps at 25W, you have lost nothing — the phone draws its 25W and the remaining capability waits for the next device. The exception: if you are buying a second adapter purely for a bedside outlet, and the only thing that will ever touch it is a base Galaxy S or A-series phone, buy the 25W — it is smaller, it is cheaper outright, and overnight charging never needs the headroom. Already own a 25W and wondering whether to swap it? The upgrade question is answered separately.
- 45W
Samsung 45W Power Adapter (EP-T4510)
The recommendation for a first purchase. Full Super Fast Charging 2.0, 20V rail, 5A cable in the box.
- Output
- 45W PD/PPS
- Ports
- 1× USB-C
- Cable
- 5A included
- Also runs
- Switch, Steam Deck
- 25W
Samsung 25W Power Adapter (EP-T2510)
The bedside answer. Right-sized for base Galaxy S, A-series, Fold and Flip; no special cable needed.
- Output
- 25W PD/PPS
- Ports
- 1× USB-C
- Cable
- 3A is enough
- Best for
- Overnight charging
- 47W
Anker 47W Nano 3 (PPS)
The 45W tier in a smaller GaN body — if the listing states its PPS window.
- Output
- 47W
- PPS
- Yes — verify
- Tech
- GaN, folding plug
- Best for
- One brick for everything
Related comparisons
FAQ
Does the Samsung 45W adapter work with non-Samsung devices?
Yes. It is a standards-compliant USB-C PD 3.0 charger, so it works with iPhones, iPads, Pixels, the Nintendo Switch and small USB-C laptops at up to 45W.
Is 25W enough for a Galaxy S Ultra?
It charges it, and at the standard Super Fast Charging tier — but the Ultra can accept 45W, so a 25W adapter leaves the fastest bulk-charge phase unused.
Can I use a third-party charger instead of Samsung's?
Yes, provided the listing states PPS support. Without PPS a Galaxy falls back to roughly 15W regardless of the adapter's headline wattage, which is why plain PD chargers disappoint Galaxy owners.