The 1N400x (or 1N4001 or 1N4000) series is a family of popular one-ampere general-purpose silicon rectifier diodes commonly used in AC adapters for common household appliances. Its blocking voltage varies from 50 volts (1N4001) to 1000 volts (1N4007).

The cathode terminal can be identified by the grey bar as shown in the picture.

POPULAR USES
To prevent reverse polarity problem
Half Wave and Full Wave rectifiers
Used as a protection device
Current flow regulators

TECHNICAL DETAILS
IF(AV) : 1.0 A
VRRM : 400 V
VR(RMS) : 280 V
IFSM : 30 A
IFSM : 45 A
VF : 1.1 V
IR : 5.0 μA
ATJ max. : ±150 °C
Package : DO-41
RoHS : Yes