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 '4J'

Marking
Name
Manufacturer/Case
Function
4J
APX803L05-20C3
Diodes
SOT-323
Voltage detector IC
2.0V±1.5%, -Reset ODO, 55ms Rt delay
4J
BZT52C3V9
Diotec Semiconductor
SOD-123
Zener diode
3.9V±5%, Izt=5mA, Zzt=90, 500mW
4J
FMMT38A
Zetex
SOT-23
NPN transistor
GP, 80V, 300mA, 330mW, B>500
4J
IMP162JEUS
IMP
SOT-143
Voltage detector IC
4.0V±1.5%, +Reset ODO, -MR
4J
KIA7433F
Korea Electronics
SOT-89
Voltage detector IC
3.3V, +Reset OCO
4J
MM1Z3V9
EIC Semiconductor
SOD-123FL
Zener diode
3.9V±5%, Izt=5mA, Zzt=130, 500mW
4J
MMSZ3V9
EIC Semiconductor
SOD-123
Zener diode
3.9V±5%, Izt=5mA, Zzt=90, 500mW
4J
R3111N141C
Ricoh
SOT-23-5
Voltage detector IC
1.4V±2%, -Reset PPO
4J
R3117K391C
Ricoh
DFN1010-4
Voltage detector IC
3.9V±1%, -Reset PPO, Sense
4J
R3131N44EA
Ricoh
SOT-23
Voltage detector IC
4.4V±1.5%,+Reset PPO, 240ms
4J
R5105N471C
Ricoh
SOT-23-6
Voltage detector IC
4.7V±1%, -Reset PPO
4J
RH5RE24AA
Ricoh
SOT-89
Linear voltage regulator IC
Ultra-LDO, 2.4V±2.5%, 300mA
4J
RP101K261D
Ricoh
DFN1612-4
Linear voltage regulator IC
LDO, LN, 2.6V±0.8%, 300mA, +CE, CL
4J
RP112K411D
Ricoh
DFN1010-4
Linear voltage regulator IC
LDO, 4.1V±1%, 150mA, +CE, CL
4J
RP124L334D
Ricoh
DFN1212-6
Linear voltage regulator IC
LDO, 3.3V±0.8%, 100mA, +LDO CE, BM=Vin/4
4J
RP173K411B
Ricoh
DFN1010-4
Linear voltage regulator IC
LDO, 4.1V±1%, 150mA, +CE
4J
RQ5RW48AA
Ricoh
SC-82AB
Linear voltage regulator IC
LDO, 4.8V±2%, 150mA, -CE
4J
TPSMW16A
Fagor Electronica
SOD-123W
Transient voltage supressor
Vrm=13.6V, Vbr=15.2..16.8V, Ipp=13.4A, 300W
4J2
UM1430B-52
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.2V±3%, 30mA
4J3
UM1430B-53
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.3V±3%, 30mA
4J4
UM1430B-54
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.4V±3%, 30mA
4J5
UM1430B-55
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.5V±3%, 30mA
4J6
UM1430B-56
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.6V±3%, 30mA
4J7
UM1430B-57
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.7V±3%, 30mA
4J8
UM1430B-58
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.8V±3%, 30mA
4J9
UM1430B-59
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.9V±3%, 30mA
4JA
FT521JAa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.2V±2%, 250mA, +CE
4JA
FT521JAb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/1.2V±2%, 250mA, +CE
4JA
UM1430B-48
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 4.8V±3%, 30mA
4JB
FT521JBa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.3V±2%, 250mA, +CE
4JB
FT521JBb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/1.3V±2%, 250mA, +CE
4JB
UM1430B-49
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 4.9V±3%, 30mA
4JC
FT521JCa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.5V±2%, 250mA, +CE
4JC
FT521JCb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/1.5V±2%, 250mA, +CE
4JC
UM1430B-50
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.0V±3%, 30mA
4JC2
81C48-P-AE3-2
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO
4JC2G
81C48G-P-AE3-2
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, Halogen free
4JC2L
81C48L-P-AE3-2
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, Lead free
4JC3
81C48-P-AE3-3
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO
4JC3G
81C48G-P-AE3-3
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, Halogen free
4JC3L
81C48L-P-AE3-3
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, Lead free
4JC5
81C48-P-AE3-5
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO
4JC5G
81C48G-P-AE3-5
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, Halogen free
4JC5L
81C48L-P-AE3-5
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, Lead free
4JD
FT521JDa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.8V±2%, 250mA, +CE
4JD
FT521JDb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/1.8V±2%, 250mA, +CE
4JD
UM1430B-51
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.1V±3%, 30mA
4JE
FT521JEa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.5V±2%, 250mA, +CE
4JE
FT521JEb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/2.5V±2%, 250mA, +CE
4JE
UM1430B-60
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 6.0V±3%, 30mA
4JF
FT521JFa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.7V±2%, 250mA, +CE
4JF
FT521JFb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/2.7V±2%, 250mA, +CE
4JF
UM1431B-48
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 4.8±3%, 100mA
4JG
FT521JGa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.8V±2%, 250mA, +CE
4JG
FT521JGb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/2.8V±2%, 250mA, +CE
4JH
FT521JHa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.85V±2%, 250mA, +CE
4JH
FT521JHb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/2.85V±2%, 250mA, +CE
4JH
UM1431B-49
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 4.9±3%, 100mA
4JI
FT521JIa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/3.0V±2%, 250mA, +CE
4JI
FT521JIb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/3.0V±2%, 250mA, +CE
4JJ
FT521JJa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/3.3V±2%, 250mA, +CE
4JJ
FT521JJb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/3.3V±2%, 250mA, +CE
4JJ
UM1431B-52
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.2±3%, 100mA
4JK
FT521JKa
Fremont Micro Devices
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/3.6V±2%, 250mA, +CE
4JK
FT521JKb
Fremont Micro Devices
SOT-89-5
Linear voltage regulator IC
LDO, Dual output, Vout1/Vout2=3.3V/3.6V±2%, 250mA, +CE
4JK
UM1431B-53
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.3±3%, 100mA
4JL
UM1431B-50
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.0±3%, 100mA
4JN
UM1431B-51
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.1±3%, 100mA
4JN
UM1431B-54
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.4±3%, 100mA
4JN2
81N48-P-AE3-2
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO
4JN2G
81N48G-P-AE3-2
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, Halogen free
4JN2L
81N48L-P-AE3-2
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, Lead free
4JN3
81N48-P-AE3-3
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO
4JN3G
81N48G-P-AE3-3
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, Halogen free
4JN3L
81N48L-P-AE3-3
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, Lead free
4JN5
81N48-P-AE3-5
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO
4JN5G
81N48G-P-AE3-5
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, Halogen free
4JN5L
81N48L-P-AE3-5
Unisonic Technologies
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, Lead free
4JP
UM1431B-55
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.5±3%, 100mA
4JQ
UM1431B-56
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.6±3%, 100mA
4JR
UM1431B-57
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.7±3%, 100mA
4JS
PZS5125BCH
PanJIT Semiconductor
SOD-323HE
Zener diode
23.8..26.3V, Izt=0.05mA, 500mW
4JS
UM1431B-58
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.8±3%, 100mA
4JT
UM1431B-59
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 5.9±3%, 100mA
4JY
UM1431B-60
Union Semiconductor
SOT-89
Linear voltage regulator IC
LDO, 6.0±3%, 100mA