WEET One Week Delivery LL-34 LL4148 Fast Switching Diode Minimelf SOD80

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


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


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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WEET LL-34 LL4148 Fast Switching Diode Minimelf SOD80

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WEET LL-34 LL4148 Fast Switching Diode Minimelf SOD80

1N4148 is a glass-sealed in-line diode, the package is DO-35; the plastic-sealed is 1N4148W or called T4, the package is SOD-123; LL4148 is MINI MELF package, cylindrical leadless, also glass-seald.

1N means that the device has a PN junction, similar to the US-made triodes which start with 2N because the triode has two PN junctions. LL4148 is a SMD version of 1N4148.

Check more LL4148 LL-34 information at https://www.weetcl.com/High_Speed_Switching_Diodes/LL34_LL4148.html 
datasheet: https://www.weetcl.com/pdf/WEET_LL34_LL4148.pdf 

Skype, Email: info@weediode.com
Written by WEE Technology Company Limited

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