1N4148 Diode: Datasheet, Pinout, Parameter [Video]

Pin No.

Pin Name

Description

1

Anode

Current always enters through Anode

2

Cathode

Current always exits through Cathode

• Is 1n4148 a Schottky diode?

First 1N4148 isn't Schottky diode. It's true it is a switching diode (fast) but not Schottky.

• What is a switching diode used for?

A switching diode is suitable for switching a small signal of up to 100 mA, acting as a rectifier. In contrast, a rectifier diode is used for AC line rectification (from alternating current to direct current). Switching diodes are designed to handle a voltage of less than tens of volts.

• What do 4148 and N in diode 1N4148 mean?

XNXXXX, this is the representation of semi-conducting bulk components of the American Standards Association. XXXX represents the model number, usually a string of numbers.

N means PN junction. The number in front represents the number of PN junctions. For example, 1N4148 means that it has only one PN junction (ie diode), and 4148 is the model number. Similar to 1N4007, 1N4734 and the like are diodes.

2N means that there are two PN junctions, which are triodes or field effect transistors. For example, common 2N3904, 2N2222 and the like are triodes. 2N5515 is a field effect tube (N-channel JFET)

Many 4N and 6N are photocouplers, such as 4N25, 6N137 and so on.

• What is the difference between 1N4148 and 1N4007?

1N4148 is a commonly used switching diode (normal forward current If: 150mA, maximum repetitive peak voltage Umax: 100V, reverse recovery time trr: 4ns).

IN4007 is also a common rectifier diode (positive power constant forward current If:1A, maximum repetitive peak voltage Umax:1000V). So they are diodes with different characteristics.

• What are the functions of the diode 1N4148 in the circuit?

It plays the role of detection, freewheeling and rectification of small currents

• How do I know if my diode 1n4148 is broken?

1. Identify the positive and negative poles of the 1n4148 diode, one end with a white line is the negative pole, and the other end is the positive pole.
2. Set the knob on the multimeter to the on-off capacity position, and insert the red and black test leads into the correct position of the multimeter.
3. Connect the red test lead to the anode of the diode and the black test lead to the cathode. Then observe the reading, if it overflows (that is, it shows 1), the diode is broken. If there is a reading, exchange the test leads. If there is a reading but not overflow, the diode is broken.

• What is the difference between IN4148 and LL4148?

LL4148 usually refers to the glass sealed cylindrical LL-34 package (SMD, no leads).

1N4148 usually refers to DO-35 glass seal, axial pin, plug-in. It can be braided or in bulk.