1、 What type of diode is LL4148?
LL4148 is a small single switch diode that, like most diodes, only allows current to flow in one direction. LL4148 is a silicon epitaxial planar diode with cathode strip identification, using a glass encapsulated version.
LL4148 has high conductivity and reliability, characterized by a fast recovery time of 8ns to 4ns only at a forward current of 300mA. Therefore, LL4148 diodes are used for fast switching.
The main use of the LL4148 diode is for fast switching, as well as various other projects such as heat monitoring, detecting LED status, and controlling another circuit.
Compared to standard silicon diodes, the LL4148 diode can ensure better performance in high-frequency applications.
2、 Characteristics of LL4148
Silicon Epitaxial Planar Diode
High conductivity
High reliability
Unleaded
Same electrical data as 1N4448 and 1N4148
Fast recovery time (8ns-4ns)
3、 LL4148 pin arrangement
The LL4148 pin arrangement is shown in the figure:
Anode: Current always enters through the anode
Cathode: Current always flows out through the cathode
4、 Equivalence and Replacement of LL4148
(1). LL4148 Equivalent
BAS32, 1N4148, 1N4448, 1N4154
(2). LL4148 Replacement
DL4148DIODES, FDLL4148_ NLDIODES, 933930220135DIODES, LL4148-CDIODES, LL4148-T1-LFDIODES
5、 LL4148 Application
Relay isolation
Speed switch
signal processing
Can be used to prevent reverse polarity issues
Protection of power electronic switches operating at high switching frequencies
Used as a protective device
Current regulator
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