LL4148 Introduction
The LL4148 is a widely used small signal switching diode featuring a SOD-80 package. It offers fast switching speed, compact size, and excellent sealing performance. Thanks to its short reverse recovery time, the LL4148 is particularly well-suited for use in logic circuits, pulse circuits, and protection circuits. In addition, its flexible layout compatibility makes it easy to integrate into PCB designs, serving as a direct replacement for various small-signal diode packages with excellent versatility and compatibility.
LL4148 Pinout
Anode (A): The terminal where conventional current enters the diode.
Cathode (K): The terminal where conventional current exits; marked by a black or white band on the glass body of the diode.
LL4148 Symbol
LL4148 Footprint
LL4148 3D Model
LL4148 Specification
| Parameter |
Value |
| Package Type |
SOD-80 |
| Reverse Voltage (VR) |
100 V |
| Forward Voltage (VF) |
1 V @ 10 mA |
| Average Forward Current (IF(avg)) |
200mA |
| Reverse Recovery Time (trr) |
4 ns |
| Reverse Leakage Current @ Vr |
25 nA @ 20 V |
| Power Dissipation (Ptot) |
500 mW |
| Junction Temperature (Tj) |
-55°C ~ 175°C |
| Capacitance @ Vr, F |
4pF @ 0V, 1MHz |
| Speed |
Small Signal =< 200mA (Io), Any Speed |
LL4148 Features
Very high switching speed
Low junction capacitance
Low leakage current
Compliant to RoHS(w/o exemp., REACH, Comflict Minerals)
Taped and reeled
LL4148 Applications
Signal processing
High-speed switching
Commercial/industrial grade
Logic Circuits
High-Speed Switching Circuits
Protection Circuits
Rectification in Low-Current Circuits
Voltage Multipliers
Waveform Clipping and Clamping
LL4148 Marking Diagram
LL4148 vs. 1N4148 vs. 1N4148W vs. LS4148
| Model |
Package Type |
Package Description |
Feature Comparison |
Typical Applications |
| LL4148 |
SOD-80 |
Axial lead, good hermetic sealing, high-temperature resistant |
Fast high-frequency response |
Pulse circuits, logic control, surge protection |
| 1N4148 |
DO-35 |
Similar to LL4148, often considered an equivalent model |
Comparable to LL4148 |
General logic circuits, small signal switching |
| 1N4148W |
SOD-123F |
Surface-mount type, suitable for automated production |
Smaller size, SMD mounting |
High-density SMT layouts, compact devices |
| LS4148 |
SOD-80C |
Ultra-compact SOD package, even smaller footprint |
Ultra-small size, fast response |
Miniaturized electronics, ultra-small form factor modules |
LL4148 Manufacturer
The LL4148 is a small-signal switching diode produced by onsemi, a global leader in semiconductor solutions. onsemi specializes in providing high-performance analog, digital, power, and sensor products, which are widely used across various industries including automotive, industrial, communications, and consumer electronics.
LL4148 Package
LL4148 Datasheet
Datasheet PDF(https://dir.heisener.com/DatasheetDownload/LL4148.pdf)
FAQs
What is the LL4148 diode used for?
The LL4148 is a small-signal switching diode commonly used in high-speed switching applications, logic circuits, pulse circuits, and surge suppression. It is widely utilized in signal processing, logic control, and protection circuits due to its fast switching speed.
What are the advantages of using LL4148?
The LL4148 offers high-speed switching and compact size, making it ideal for use in small, high-frequency applications. Its reliability and low cost also contribute to its popularity in various consumer electronics and logic circuits.
What's the difference between LL4148 and LL4148-GS08?
The main difference between the LL4148 and the LL4148-GS08 lies in the packaging and distribution options. While the LL4148 is the standard version of the small-signal switching diode, the LL4148-GS08 is a reel-packaged version that comes in a tape-and-reel format, typically intended for automated pick-and-place assembly processes.
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