- Primary Output Specification
A 12W charger almost exclusively operates at the standard USB voltage of 5V.
- Voltage (V): 5V (Volts)
- Current (I): 2.4A (Amperes)
Using the power formula P=V×I:
5V×2.4A=12W
This 5V/2.4A profile is the definitive specification for a 12W charger.
- Charging Protocols / Standards
The 12W power level is often associated with the following standards:
Apple 2.4A
5V/2.4A
The standard developed by Apple for faster charging on iPads and some iPhones (pre-USB PD). It is widely supported by third-party chargers to ensure fast charging for these devices.
USB Battery Charging (BC) 1.2
Up to 5V/1.5A (7.5W)
The official standard does not specify 2.4A, but most 12W chargers are backwards-compatible with BC1.2 for other devices.
Generic
5V/2.4A
Many non-brand chargers simply provide this output without advertising a specific protocol, as it is a safe and high-speed common denominator.
- Additional Specifications
Feature
Typical Specification
Input Voltage
100−240V AC
Input Frequency
50/60Hz
Port Type
USB Type-A (Older standard), or USB Type-C (Newer models may support 12W through USB-C but also have higher PD profiles).
Safety Features
Over-voltage, Over-current, Short-circuit, and Over-temperature protection.




