J1772 — the incumbent AC standard
J1772 (the "J-plug", also called Type 1) has been the standard AC charging connector for non-Tesla EVs in North America since the modern EV era began. Non-Tesla EVs built before the NACS transition use it natively, and most of the installed base of public Level 2 chargers — workplaces, garages, hotels, curbside posts — carries J1772 handles.
The connector itself is AC-only, rated up to 80 A (about 19.2 kW at 240 V) — which is why DC fast charging needed the CCS1 design, which adds two large DC pins below the J1772 shape.
NACS — the connector North America is moving to
NACS is Tesla's connector design, standardized by SAE International as J3400. Nearly every major automaker selling EVs in North America has adopted it or committed to adopting it. It's smaller and lighter and handles both AC and DC through one plug, and adopting it brings access to the Supercharger network — key reasons the industry moved toward it.
The rollout is gradual. Some brands already build cars with native NACS ports, while others still ship CCS1/J1772 ports on some models and rely on adapters until their next model-year updates. Meanwhile, most public Level 2 infrastructure is still J1772. That mixed world is exactly what adapters are for.
The adapter matrix
- NACS car at a J1772 charger: J1772-to-NACS adapter — the single most useful accessory for new-generation EV owners; keep it in the car.
- J1772 car at a NACS home charger: NACS-to-J1772 adapter — increasingly relevant as homes install NACS wall units.
- AC adapters are simple and inexpensive; a quality, safety-certified one rated for the charger's current shouldn't slow Level 2 charging.
- Check the box first: some cars with NACS ports come with a J1772 adapter included.
- This is AC-only advice: DC fast-charging adapters (for Supercharger or CCS1 access) are a separate, higher-stakes purchase — use units your car's manufacturer approves.
Which home charger should you buy during the transition?
Buy the connector matching your primary car, and bridge the rest of the driveway with an adapter. If you're buying for the long term and expect to replace vehicles, NACS is likely the more future-proof connector in North America given automakers' commitments — with a J1772 adapter for older cars rather than the other way around. Some home chargers also offer swappable or dual connectors, which sidesteps the question.
