The ultimate SMD marking codes database

Due to the small size of most SMD components, manufacturers are not able to write the full part number on the case. They use instead a marking code typically composed of a combination of 2 or 3 letters or digits. When repairing an unknown electronic board, it becomes so difficult to know what is the exact type of a given component. This database allows to quickly find the part number of a SMD component when you have only the marking code.

Showing codes starting with '4I'

Marking
Name
Manufacturer/Case
Function
4IA
FT521IAa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.2V±2%, 250mA, +CE
4IA
FT521IAb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.2V±2%, 250mA, +CE
4IB
FT521IBa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.3V±2%, 250mA, +CE
4IB
FT521IBb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.3V±2%, 250mA, +CE
4IC
FT521ICa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.5V±2%, 250mA, +CE
4IC
FT521ICb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.5V±2%, 250mA, +CE
4ID
FT521IDa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.8V±2%, 250mA, +CE
4ID
FT521IDb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/1.8V±2%, 250mA, +CE
4IE
FT521IEa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.5V±2%, 250mA, +CE
4IE
FT521IEb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.5V±2%, 250mA, +CE
4IF
FT521IFa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.7V±2%, 250mA, +CE
4IF
FT521IFb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.7V±2%, 250mA, +CE
4IG
FT521IGa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.8V±2%, 250mA, +CE
4IG
FT521IGb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.8V±2%, 250mA, +CE
4IH
FT521IHa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.85V±2%, 250mA, +CE
4IH
FT521IHb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/2.85V±2%, 250mA, +CE
4II
FT521IIa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/3.0V±2%, 250mA, +CE
4II
FT521IIb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/3.0V±2%, 250mA, +CE
4IJ
FT521IJa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/3.3V±2%, 250mA, +CE
4IJ
FT521IJb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/3.3V±2%, 250mA, +CE
4IK
FT521IKa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/3.6V±2%, 250mA, +CE
4IK
FT521IKb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.0V/3.6V±2%, 250mA, +CE