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Difference Between 1N4148, 1N4007 and 1N5819

Author: Mia
Date: 24 Feb 2021
 4519
1n5819

This is a blog discusses the difference between 1N4148, 1N4007, 1N5819.


Catalog

I. Brief Introduction to 1N4148, 1N4007, 1N5819

II.Diodes Introduction

2.1 Switching Diode

2.2 Rectifier Diode

2.3 Schottky Diode

III. 1N4148 vs 1N4007

3.1 General Difference

3.2 Application Difference

3.3 Conclusion

IV. 1N4148 vs 1N5819


I. Brief Introduction to 1N4148, 1N4007, 1N5819

1N4148 is a fast switching diode.  It is fabricated in planar technology, and encapsulated in hermetically sealed leaded glass SOD27 (DO-35) packages.

1N4148

1N4148

1N4007 is a PN junction rectifier diode. These types of diodes allow only the flow of electrical current in one direction only. So, it can be used for the conversion of AC power to DC.

1N4007

1N4007

1N5819 is a Schottky diode with 2 pins, a peak current of 25A, and an operating temperature range of -65°C~ +125°C. It is commonly used in high frequency applications like Inverters, DC-DC converters etc.

1N5819

1N5819

II. Diode Introduction

 

Next, we’ll talk about what diode is, and give some explanations of some common types of diodes which appear in this article.

 

What is diode? Well, the diode is a two-terminal electrical device that allows the current to be transferred in one direction only. The diode is also known for its unidirectional current property, where the electrical current is allowed to flow in one direction. In principle, a diode is used to rectify waveforms, in radio detectors or in power supplies. They can also be used in various electrical and electronic circuits where the 'one-way' diode result is required. Most diodes are made from semiconductors such as Si (silicon), but in a few cases Ge (germanium) is also used.

 

There are several types of diodes and those are available for use in electronics design, such as: Laser diode, Light emitting diodes, crystal diode, PN Junction, Shockley diode, Zener diode and many others. We will only discuss the diode types that appear in the article, namely switching diode, rectifier diode and schottky diode.

 

2.1 Switching Diode

 

A Switching Diode is commonly referred to as a “Signal Diode”, it is a semiconductor that can be used to switch signals or act as a rectifier at low voltages.

 

Within a circuit they can provide similar functionality to a physical switch, with the on/off state governed by the direction of the current flow. When there is forward current in the circuit (forward-bias), the switching diode effectively is a closed switch with low resistance, allowing current to flow. If the current of the circuit is reversed (reverse bias), the switching diode provides high resistance, preventing current flow up to a specified threshold.

 

A switching diode can be used in low voltage applications that require fast switching and a high speed rectification. A diode can also be used as a circuit protection device to prevent reverse current damaging a device upstream of the switching diode, such as microcontroller.

 

2.2 Rectifier Diode

 

A rectifier diode is a semiconductor diode, used to rectify AC (alternating current) to DC (direct current) using the rectifier bridge application. The alternative of rectifier diode through the Schottky barrier is mainly valued within digital electronics. This diode is capable to conduct the values of current which changes from mA to a few kA & voltages up to a few kV.

 

Rectifier diodes are used in power supplies to convert alternating current (AC) to direct current (DC), a process called rectification. They are also used elsewhere in circuits where a large current must pass through the diode.

 

All rectifier diodes are made from silicon and therefore have a forward voltage drop of 0.7V. The table shows maximum current and maximum reverse voltage for some popular rectifier diodes. The 1N4001 is suitable for most low voltage circuits with a current of less than 1A.

 

2.3 Schottky Diode

 

A Schottky diode is also known as a hot carrier diode; it is a semiconductor diode with a very fast switching action, but a low forward voltage drop. When a current flows through the diode there is a small voltage drop across the diode terminals. In a normal diode, the voltage drop is between 0.6 to 1.7 volts, while in a Schottky diode the voltage drop normally ranges between 0.15 and 0.45volts. This lower voltage drop provides higher switching speed and better system efficiency.

 

In Schottky diode, a semiconductor–metal junction is formed between a semiconductor and a metal, thus creating a Schottky barrier. The N-type semiconductor acts as a cathode and the metal side acts as the anode of the diode.

 

Schottky diodes are used for the voltage clamping applications and prevention of transistor saturation due to the high current density in the Schottky diode. It’s also been a low forward voltage drop in Schottky diode, it is wasted in less heat, making them an efficient choice for applications that are sensitive and very efficient.

 

Because of the Schottky diode used in stand-alone photovoltaic systems in order to prevent batteries from discharging purpose for the solar panels at night as well as in grid-connected systems, containing multiple strings are connected in parallel connection. Schottky diodes are also used as rectifiers in power supplies.

 

III. 1N4148 vs 1N4007

3.1 General difference

 

1. 1N4148 and 1N4007 can be replaced with each other in case of general small current (below 100mA, reverse voltage below 100V) and unimportant occasions.

 

2. 1N4148 is a small current switch tube, with a voltage resistance of 100V.

 

3. 1N4007 is a rectifier tube, 1A-1000V. There are many types of substitute models.

 

3.2 Application difference

 

Generally speaking, we mostly use 1n4148 when using freewheeling diodes;

 

Since it is a freewheeling diode, it is generally used on inductive loads, such as: buzzer, relay;

 

Several factors we have to consider are:

 

1. How fast is the freewheeling diode? Just take an appropriate value; for example, MS level, US level, NS level?

 

2. What is the current of the freewheeling diode? Look at the DS manual, don't burn it out.

 

3. How high is the voltage of the freewheeling diode? Look at the DS manual, don't break it.

 

3.3 Conclusion

 

1N4148: 100V reverse withstand voltage and 150mA average forward current, very suitable for ordinary rectification in general occasions. The reverse recovery time of 4nS is sufficient for most occasions.

 

1N4007: Maximum forward average rectified current, 1A maximum reverse withstand voltage, 1000V low reverse leakage current, 5uA (maximum) forward voltage drop, 1.0V maximum reverse peak current, 30uA, reverse recovery time 30us;

 

1N4148: Generally, IN4148 is used in weak current inductive loads, such as buzzer and other small current inductive loads;

 

1N4007: Generally used in large current loads, such as industrial load (relay), power supply load;

 

The biggest difference between them is the current, voltage, and response speed.

 

In a sense, 1N4007 can replace 1N4148, as long as the response speed is not too demanding, 1N4148 is destined to be used only on weak current low-current inductive loads.

 

IV. 1N4148 vs 1N5819

High frequency, low voltage, and high current characteristics are the differences between 1N5819 diodes and ordinary diodes. It is widely used in switching power supplies, frequency converters, drivers and other circuits for high frequency, low voltage, high current rectification, freewheeling, and diode protection.

 

1N5819 is characterized by ultra-fast speed (low switching loss), extremely low forward voltage drop (low voltage loss), but also low reverse withstand voltage, usually less than 60V, suitable for low-voltage (no higher than 12V) switching power supply.

 

Another use of 1N5819 diode is to use its reverse characteristic to stabilize voltage. Therefore, when the withstand voltage is low and the current is not large, you can consider using a Zener tube instead.

 

1N4148 is a point contact type low current high frequency switching diode with high speed, but the working current is only 150mA, which is widely used in circuits with higher signal frequencies.

 

The reverse leakage of 1N5819 tube is relatively large, but it has the characteristics of small capacitance and high speed. But it is not as fast as 1N4148, after all, the purpose of 1N4148 is high frequency detection, not rectification.

 

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
1N4148-113 1N4148-113 Company:NXP USA Inc. Remark:DIODE GEN PURP 100V 200MA ALF2 Package:DO-204AH, DO-35, Axial
DataSheet
In Stock:On Order
Inquiry
Price:
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1N4148-133 1N4148-133 Company:NXP USA Inc. Remark:DIODE GEN PURP 100V 200MA ALF2 Package:DO-204AH, DO-35, Axial
DataSheet
In Stock:On Order
Inquiry
Price:
Call
Inquiry
1N4148-143 1N4148-143 Company:NXP USA Inc. Remark:DIODE GEN PURP 100V 200MA ALF2 Package:DO-204AH, DO-35, Axial
DataSheet
In Stock:On Order
Inquiry
Price:
Call
Inquiry
1N4148TA 1N4148TA Company:ON Semiconductor Remark:DIODE GEN PURP 100V 200MA DO35 Package:DO-204AH, DO-35, Axial
DataSheet
In Stock:150000
Inquiry
Price:
5000+: $0.01013
10000+: $0.00900
25000+: $0.00810
50000+: $0.00698
125000+: $0.00608
Inquiry
1N4148TR 1N4148TR Company:ON Semiconductor Remark:DIODE GEN PURP 100V 200MA DO35 Package:DO-204AH, DO-35, Axial
DataSheet
In Stock:470000
Inquiry
Price:
10000+: $0.00860
30000+: $0.00774
50000+: $0.00667
100000+: $0.00645
250000+: $0.00581
Inquiry
1N4148W-13-F 1N4148W-13-F Company:Diodes Incorporated Remark:DIODE GEN PURP 100V 150MA SOD123 Package:SOD-123
DataSheet
In Stock:140000
Inquiry
Price:
10000+: $0.02424
30000+: $0.02182
50000+: $0.01879
100000+: $0.01818
250000+: $0.01612
Inquiry
1N4148W-7-F 1N4148W-7-F Company:Diodes Incorporated Remark:DIODE GEN PURP 100V 300MA SOD123 Package:SOD-123
DataSheet
In Stock:3069000
Inquiry
Price:
3000+: $0.02589
6000+: $0.02500
9000+: $0.02222
30000+: $0.02000
75000+: $0.01722
Inquiry
1N4148W-E3-08 1N4148W-E3-08 Company:Vishay Semiconductor Diodes Division Remark:DIODE GEN PURP 75V 150MA SOD123 Package:SOD-123
DataSheet
In Stock:93000
Inquiry
Price:
3000+: $0.03230
6000+: $0.03060
9000+: $0.02805
30000+: $0.02635
75000+: $0.02380
Inquiry
1N4148W-G3-18 1N4148W-G3-18 Company:Vishay Semiconductor Diodes Division Remark:DIODE GEN PURP 75V 150MA SOD123 Package:SOD-123
DataSheet
In Stock:30000
Inquiry
Price:
10000+: $0.03399
30000+: $0.03193
50000+: $0.02884
100000+: $0.02740
Inquiry
1N4148WS 1N4148WS Company:ON Semiconductor Remark:DIODE GEN PURP 75V 150MA SOD323F Package:SC-90, SOD-323F
DataSheet
In Stock:186000
Inquiry
Price:
3000+: $0.02610
6000+: $0.02520
9000+: $0.02240
30000+: $0.02016
75000+: $0.01736
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