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
AP7341-285FS4-7R
Diodes
X2-DFN1010-4
X2-DFN1010-4
Linear voltage regulator IC
LDO, 2.85V±1%, 300mA, +CE
LDO, 2.85V±1%, 300mA, +CE
4J
APX803L05-20C3
Diodes
SOT-323
SOT-323
Voltage detector IC
2.0V±1.5%, -Reset ODO, Rdt=55ms
2.0V±1.5%, -Reset ODO, Rdt=55ms
4J
BZT52C3V9
Diotec Semiconductor
SOD-123
SOD-123
Zener diode
3.9V±5%, Izt=5mA, Zzt=90, 500mW
3.9V±5%, Izt=5mA, Zzt=90, 500mW
4J
DDZ3V9ASF
Diodes
SOD-323F
SOD-323F
Zener diode
3.74..4.01V, Izt=20mA, Zzt=130, 500mW
3.74..4.01V, Izt=20mA, Zzt=130, 500mW
4J
FMMT38A
Zetex
SOT-23
SOT-23
NPN transistor
GP, 80V, 300mA, 330mW, B>500
GP, 80V, 300mA, 330mW, B>500
4J
IMP162JEUS
IMP
SOT-143
SOT-143
Voltage detector IC
4.0V±1.5%, +Reset ODO, -MR
4.0V±1.5%, +Reset ODO, -MR
4J
KIA7433F
Korea Electronics
SOT-89
SOT-89
Voltage detector IC
3.3V±2%, +Reset OCO
3.3V±2%, +Reset OCO
4J
MM1Z3V9
EIC Semiconductor
SOD-123
SOD-123
Zener diode
3.9V±5%, Izt=5mA, Zzt=130, 500mW
3.9V±5%, Izt=5mA, Zzt=130, 500mW
4J
MMSZ3V9
EIC Semiconductor
SOD-123FL
SOD-123FL
Zener diode
3.9V±5%, Izt=5mA, Zzt=90, 500mW
3.9V±5%, Izt=5mA, Zzt=90, 500mW
4J
PT7M825MSE
Diodes
SOT-353
SOT-353
Voltage detector IC
4.38V±1%, ±Reset PPO, -MR
4.38V±1%, ±Reset PPO, -MR
4J
R3111N141C
Ricoh
SOT-23-5
SOT-23-5
Voltage detector IC
1.4V±2%, -Reset PPO
1.4V±2%, -Reset PPO
4J
R3117K391C
Ricoh
DFN1010-4
DFN1010-4
Voltage detector IC
3.9V±1%, -Reset PPO, Sense
3.9V±1%, -Reset PPO, Sense
4J
R3131N44EA
Ricoh
SOT-23
SOT-23
Voltage detector IC
4.4V±1.5%, +Reset PPO, Rdt=240ms
4.4V±1.5%, +Reset PPO, Rdt=240ms
4J
R5105N471C
Ricoh
SOT-23-6
SOT-23-6
Voltage detector IC
4.7V±1%, -Reset PPO
4.7V±1%, -Reset PPO
4J
RH5RE24AA
Ricoh
SOT-89
SOT-89
Linear voltage regulator IC
Ultra-LDO, 2.4V±2.5%, 300mA
Ultra-LDO, 2.4V±2.5%, 300mA
4J
RP101K261D
Ricoh
DFN1612-4
DFN1612-4
Linear voltage regulator IC
LDO, LN, 2.6V±0.8%, 300mA, +CE, CL
LDO, LN, 2.6V±0.8%, 300mA, +CE, CL
4J
RP112K411D
Ricoh
DFN1010-4
DFN1010-4
Linear voltage regulator IC
LDO, 4.1V±1%, 150mA, +CE, CL
LDO, 4.1V±1%, 150mA, +CE, CL
4J
RP124L334D
Ricoh
DFN1212-6
DFN1212-6
Linear voltage regulator IC
LDO, 3.3V±0.8%, 100mA, +LDO CE, BM=Vin/4
LDO, 3.3V±0.8%, 100mA, +LDO CE, BM=Vin/4
4J
RP173K411B
Ricoh
DFN1010-4
DFN1010-4
Linear voltage regulator IC
LDO, 4.1V±1%, 150mA, +CE
LDO, 4.1V±1%, 150mA, +CE
4J
RQ5RW48AA
Ricoh
SC-82AB
SC-82AB
Linear voltage regulator IC
LDO, 4.8V±2%, 150mA, -CE
LDO, 4.8V±2%, 150mA, -CE
4J
TPSMW16A
Fagor Electronica
SOD-123W
SOD-123W
Transient voltage supressor
Vrm=13.6V, Vbr=15.2..16.8V, Ipp=13.4A, 300W
Vrm=13.6V, Vbr=15.2..16.8V, Ipp=13.4A, 300W
4J2
UM1430B-52
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.2V±3%, 30mA
LDO, 5.2V±3%, 30mA
4J3
UM1430B-53
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.3V±3%, 30mA
LDO, 5.3V±3%, 30mA
4J4
UM1430B-54
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.4V±3%, 30mA
LDO, 5.4V±3%, 30mA
4J5
UM1430B-55
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.5V±3%, 30mA
LDO, 5.5V±3%, 30mA
4J6
UM1430B-56
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.6V±3%, 30mA
LDO, 5.6V±3%, 30mA
4J7
UM1430B-57
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.7V±3%, 30mA
LDO, 5.7V±3%, 30mA
4J8
UM1430B-58
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.8V±3%, 30mA
LDO, 5.8V±3%, 30mA
4J9
UM1430B-59
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.9V±3%, 30mA
LDO, 5.9V±3%, 30mA
4JA
FT521JAa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.2V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/1.2V±2%, 250mA, +CE
4JA
FT521JAb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/1.2V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/1.2V±2%, 250mA, +CE
4JA
SG431AS
Kodenshi AUK
SOT-23
SOT-23
Voltage reference IC
Adjustable, Precision, Shunt, 2.495..36V±0.3%
Adjustable, Precision, Shunt, 2.495..36V±0.3%
4JA
UM1430B-48
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 4.8V±3%, 30mA
LDO, 4.8V±3%, 30mA
4JB
FT521JBa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.3V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/1.3V±2%, 250mA, +CE
4JB
FT521JBb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/1.3V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/1.3V±2%, 250mA, +CE
4JB
SG431BS
Kodenshi AUK
SOT-23
SOT-23
Voltage reference IC
Adjustable, Precision, Shunt, 2.495..36V±0.5%
Adjustable, Precision, Shunt, 2.495..36V±0.5%
4JB
UM1430B-49
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 4.9V±3%, 30mA
LDO, 4.9V±3%, 30mA
4JC
FT521JCa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.5V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/1.5V±2%, 250mA, +CE
4JC
FT521JCb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/1.5V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/1.5V±2%, 250mA, +CE
4JC
SG431CS
Kodenshi AUK
SOT-23
SOT-23
Voltage reference IC
Adjustable, Precision, Shunt, 2.495..36V±1%
Adjustable, Precision, Shunt, 2.495..36V±1%
4JC
UM1430B-50
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.0V±3%, 30mA
LDO, 5.0V±3%, 30mA
4JC2
81C48-P-AE3-2
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO
4.8V±2%, -Reset PPO
4JC2G
81C48G-P-AE3-2
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, H-free
4.8V±2%, -Reset PPO, H-free
4JC2L
81C48L-P-AE3-2
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, L-free
4.8V±2%, -Reset PPO, L-free
4JC3
81C48-P-AE3-3
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO
4.8V±2%, -Reset PPO
4JC3G
81C48G-P-AE3-3
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, H-free
4.8V±2%, -Reset PPO, H-free
4JC3L
81C48L-P-AE3-3
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, L-free
4.8V±2%, -Reset PPO, L-free
4JC5
81C48-P-AE3-5
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO
4.8V±2%, -Reset PPO
4JC5G
81C48G-P-AE3-5
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, H-free
4.8V±2%, -Reset PPO, H-free
4JC5L
81C48L-P-AE3-5
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset PPO, L-free
4.8V±2%, -Reset PPO, L-free
4JD
FT521JDa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/1.8V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/1.8V±2%, 250mA, +CE
4JD
FT521JDb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/1.8V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/1.8V±2%, 250mA, +CE
4JD
UM1430B-51
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.1V±3%, 30mA
LDO, 5.1V±3%, 30mA
4JE
FT521JEa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.5V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/2.5V±2%, 250mA, +CE
4JE
FT521JEb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/2.5V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/2.5V±2%, 250mA, +CE
4JE
UM1430B-60
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 6.0V±3%, 30mA
LDO, 6.0V±3%, 30mA
4JF
FT521JFa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.7V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/2.7V±2%, 250mA, +CE
4JF
FT521JFb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/2.7V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/2.7V±2%, 250mA, +CE
4JF
UM1431B-48
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 4.8±3%, 100mA
LDO, 4.8±3%, 100mA
4JG
FT521JGa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.8V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/2.8V±2%, 250mA, +CE
4JG
FT521JGb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/2.8V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/2.8V±2%, 250mA, +CE
4JH
FT521JHa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/2.85V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/2.85V±2%, 250mA, +CE
4JH
FT521JHb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/2.85V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/2.85V±2%, 250mA, +CE
4JH
UM1431B-49
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 4.9±3%, 100mA
LDO, 4.9±3%, 100mA
4JI
FT521JIa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/3.0V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/3.0V±2%, 250mA, +CE
4JI
FT521JIb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/3.0V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/3.0V±2%, 250mA, +CE
4JJ
FT521JJa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/3.3V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/3.3V±2%, 250mA, +CE
4JJ
FT521JJb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/3.3V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/3.3V±2%, 250mA, +CE
4JJ
UM1431B-52
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.2±3%, 100mA
LDO, 5.2±3%, 100mA
4JK
FT521JKa
Fremont Micro Devices
SOT-23-6L
SOT-23-6L
Linear voltage regulator IC
LDO, Dual out, Vo1/Vo2=3.3V/3.6V±2%, 250mA, +CE
LDO, Dual out, Vo1/Vo2=3.3V/3.6V±2%, 250mA, +CE
4JK
FT521JKb
Fremont Micro Devices
SOT-89-5
SOT-89-5
Linear voltage regulator IC
LDO, Dual out, Vout1/Vout2=3.3V/3.6V±2%, 250mA, +CE
LDO, Dual out, Vout1/Vout2=3.3V/3.6V±2%, 250mA, +CE
4JK
UM1431B-53
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.3±3%, 100mA
LDO, 5.3±3%, 100mA
4JL
UM1431B-50
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.0±3%, 100mA
LDO, 5.0±3%, 100mA
4JN
UM1431B-51
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.1±3%, 100mA
LDO, 5.1±3%, 100mA
4JN
UM1431B-54
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.4±3%, 100mA
LDO, 5.4±3%, 100mA
4JN2
81N48-P-AE3-2
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO
4.8V±2%, -Reset ODO
4JN2G
81N48G-P-AE3-2
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, H-free
4.8V±2%, -Reset ODO, H-free
4JN2L
81N48L-P-AE3-2
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, L-free
4.8V±2%, -Reset ODO, L-free
4JN3
81N48-P-AE3-3
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO
4.8V±2%, -Reset ODO
4JN3G
81N48G-P-AE3-3
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, H-free
4.8V±2%, -Reset ODO, H-free
4JN3L
81N48L-P-AE3-3
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, L-free
4.8V±2%, -Reset ODO, L-free
4JN5
81N48-P-AE3-5
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO
4.8V±2%, -Reset ODO
4JN5G
81N48G-P-AE3-5
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, H-free
4.8V±2%, -Reset ODO, H-free
4JN5L
81N48L-P-AE3-5
Unisonic Technologies
SOT-23
SOT-23
Voltage detector IC
4.8V±2%, -Reset ODO, L-free
4.8V±2%, -Reset ODO, L-free
4JP
UM1431B-55
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.5±3%, 100mA
LDO, 5.5±3%, 100mA
4JQ
UM1431B-56
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.6±3%, 100mA
LDO, 5.6±3%, 100mA
4JR
UM1431B-57
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.7±3%, 100mA
LDO, 5.7±3%, 100mA
4JS
PZS5125BCH
PanJIT Semiconductor
SOD-323HE
SOD-323HE
Zener diode
23.8..26.3V, Izt=0.05mA, 500mW
23.8..26.3V, Izt=0.05mA, 500mW
4JS
UM1431B-58
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.8±3%, 100mA
LDO, 5.8±3%, 100mA
4JT
UM1431B-59
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 5.9±3%, 100mA
LDO, 5.9±3%, 100mA
4JY
UM1431B-60
Union Semiconductor
SOT-89
SOT-89
Linear voltage regulator IC
LDO, 6.0±3%, 100mA
LDO, 6.0±3%, 100mA