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Diode type with lowest drop voltage [duplicate]

Lowest voltage drop diode possibleUnderstanding an 'ideal' diode made from a p-channel MOSFET and PNP transistorsFlyback diode forward voltage dropHarvesting Energy from an Electromagnetic GeneratorDiode Bridge Rectifier using Dual Schottkey Diode BridgeVoltage drop across a diodeLowest voltage drop diode possibleWhat should I keep instead of this energy harvester breakout for maximum efficiency of the solar and supercaps circuit?Type of Diode for Solar PanelHow to design a low voltage astable multiviratorHarvesting energy from solar and “USB”Mosfet or bjt choice for low voltage joule thief application

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3

$begingroup$

This question already has an answer here:

• 
  Lowest voltage drop diode possible
  
  5 answers
  
  

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ?

Thank you

diodes boost low-power solar-energy energy-harvesting

share|improve this question

edited May 22 at 10:51

Back Link

asked May 22 at 10:48

Back LinkBack Link

183

$endgroup$

marked as duplicate by dim, JRE, RoyC, Warren Hill, JYelton May 24 at 20:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
  $endgroup$
  – Andy aka
  May 22 at 10:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
  $endgroup$
  – Back Link
  May 22 at 10:54
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  How exactly do you intend to use them?
  $endgroup$
  – Lundin
  May 22 at 11:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Lundin i use two diodes, one on the output of solar cell, one on the output of boost converter
  $endgroup$
  – Back Link
  May 22 at 11:23
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
  $endgroup$
  – Lundin
  May 22 at 11:26
  
  

  
  
  
  

add a comment | 

3

$begingroup$

This question already has an answer here:

• 
  Lowest voltage drop diode possible
  
  5 answers
  
  

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ?

Thank you

diodes boost low-power solar-energy energy-harvesting

share|improve this question

edited May 22 at 10:51

Back Link

asked May 22 at 10:48

Back LinkBack Link

183

$endgroup$

marked as duplicate by dim, JRE, RoyC, Warren Hill, JYelton May 24 at 20:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
  $endgroup$
  – Andy aka
  May 22 at 10:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
  $endgroup$
  – Back Link
  May 22 at 10:54
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  How exactly do you intend to use them?
  $endgroup$
  – Lundin
  May 22 at 11:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Lundin i use two diodes, one on the output of solar cell, one on the output of boost converter
  $endgroup$
  – Back Link
  May 22 at 11:23
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
  $endgroup$
  – Lundin
  May 22 at 11:26
  
  

  
  
  
  

add a comment | 

$begingroup$

This question already has an answer here:

• 
  Lowest voltage drop diode possible
  
  5 answers
  
  

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ?

Thank you

diodes boost low-power solar-energy energy-harvesting

share|improve this question

edited May 22 at 10:51

Back Link

asked May 22 at 10:48

Back LinkBack Link

183

$endgroup$

share|improve this question

edited May 22 at 10:51

Back Link

asked May 22 at 10:48

Back LinkBack Link

183

share|improve this question

edited May 22 at 10:51

Back Link

asked May 22 at 10:48

Back LinkBack Link

183

asked May 22 at 10:48

Back LinkBack Link

183

asked May 22 at 10:48

Back LinkBack Link

183

5 Answers
5

active

oldest

votes

3

$begingroup$

Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):

DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)

share|improve this answer

edited May 22 at 11:15

answered May 22 at 11:04

IndraneelIndraneel

1,4331715

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
  $endgroup$
  – Back Link
  May 22 at 11:29
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
  $endgroup$
  – Sean Houlihane
  May 22 at 12:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
  $endgroup$
  – Sunnyskyguy EE75
  May 22 at 13:20
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
  $endgroup$
  – Indraneel
  May 22 at 16:41
  
  

  
  
  
  

add a comment | 

4

$begingroup$

You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).

share|improve this answer

answered May 22 at 10:57

Spehro PefhanySpehro Pefhany

217k5166445

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @SpehroThanks for your suggestion
  $endgroup$
  – Back Link
  May 22 at 11:24
  
  

  
  
  
  

add a comment | 

4

$begingroup$

For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.

Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors

Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :

– Ultra-Low Quiescent Current of 325 nA.

– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources

share|improve this answer

edited May 22 at 13:50

answered May 22 at 13:29

Sunnyskyguy EE75Sunnyskyguy EE75

75.4k229107

$endgroup$

add a comment | 

1

$begingroup$

Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 200mV.

There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.

For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...

share|improve this answer

edited May 23 at 2:59

answered May 22 at 13:50

heketehekete

29816

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  "Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
  $endgroup$
  – marcelm
  May 22 at 15:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yes, sorry 200mV
  $endgroup$
  – hekete
  May 23 at 3:00
  

  
  
  
  

add a comment | 

0

$begingroup$

If you are just using the diodes to mux two power sources then you can use an ideal diode chip.

https://www.analog.com/en/parametricsearch/11029

They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.

share|improve this answer

answered May 22 at 14:44

user4574user4574

3,667512

$endgroup$

add a comment | 

3

$begingroup$

Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):

DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)

share|improve this answer

edited May 22 at 11:15

answered May 22 at 11:04

IndraneelIndraneel

1,4331715

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
  $endgroup$
  – Back Link
  May 22 at 11:29
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
  $endgroup$
  – Sean Houlihane
  May 22 at 12:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
  $endgroup$
  – Sunnyskyguy EE75
  May 22 at 13:20
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
  $endgroup$
  – Indraneel
  May 22 at 16:41
  
  

  
  
  
  

add a comment | 

3

$begingroup$

Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):

DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)

share|improve this answer

edited May 22 at 11:15

answered May 22 at 11:04

IndraneelIndraneel

1,4331715

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
  $endgroup$
  – Back Link
  May 22 at 11:29
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
  $endgroup$
  – Sean Houlihane
  May 22 at 12:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
  $endgroup$
  – Sunnyskyguy EE75
  May 22 at 13:20
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
  $endgroup$
  – Indraneel
  May 22 at 16:41
  
  

  
  
  
  

add a comment | 

$begingroup$

Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):

DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)

share|improve this answer

edited May 22 at 11:15

answered May 22 at 11:04

IndraneelIndraneel

1,4331715

$endgroup$

DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)

share|improve this answer

edited May 22 at 11:15

answered May 22 at 11:04

IndraneelIndraneel

1,4331715

answered May 22 at 11:04

IndraneelIndraneel

1,4331715

answered May 22 at 11:04

IndraneelIndraneel

1,4331715

4

$begingroup$

You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).

share|improve this answer

answered May 22 at 10:57

Spehro PefhanySpehro Pefhany

217k5166445

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @SpehroThanks for your suggestion
  $endgroup$
  – Back Link
  May 22 at 11:24
  
  

  
  
  
  

add a comment | 

4

$begingroup$

You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).

share|improve this answer

answered May 22 at 10:57

Spehro PefhanySpehro Pefhany

217k5166445

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @SpehroThanks for your suggestion
  $endgroup$
  – Back Link
  May 22 at 11:24
  
  

  
  
  
  

add a comment | 

$begingroup$

You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).

share|improve this answer

answered May 22 at 10:57

Spehro PefhanySpehro Pefhany

217k5166445

$endgroup$

share|improve this answer

answered May 22 at 10:57

Spehro PefhanySpehro Pefhany

217k5166445

answered May 22 at 10:57

Spehro PefhanySpehro Pefhany

217k5166445

answered May 22 at 10:57

Spehro PefhanySpehro Pefhany

217k5166445

4

$begingroup$

For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.

Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors

Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :

– Ultra-Low Quiescent Current of 325 nA.

– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources

share|improve this answer

edited May 22 at 13:50

answered May 22 at 13:29

Sunnyskyguy EE75Sunnyskyguy EE75

75.4k229107

$endgroup$

add a comment | 

4

$begingroup$

For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.

Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors

Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :

– Ultra-Low Quiescent Current of 325 nA.

– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources

share|improve this answer

edited May 22 at 13:50

answered May 22 at 13:29

Sunnyskyguy EE75Sunnyskyguy EE75

75.4k229107

$endgroup$

add a comment | 

$begingroup$

For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.

Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors

Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :

– Ultra-Low Quiescent Current of 325 nA.

– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources

share|improve this answer

edited May 22 at 13:50

answered May 22 at 13:29

Sunnyskyguy EE75Sunnyskyguy EE75

75.4k229107

$endgroup$

share|improve this answer

edited May 22 at 13:50

answered May 22 at 13:29

Sunnyskyguy EE75Sunnyskyguy EE75

75.4k229107

answered May 22 at 13:29

Sunnyskyguy EE75Sunnyskyguy EE75

75.4k229107

answered May 22 at 13:29

Sunnyskyguy EE75Sunnyskyguy EE75

75.4k229107

1

$begingroup$

Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 200mV.

There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.

For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...

share|improve this answer

edited May 23 at 2:59

answered May 22 at 13:50

heketehekete

29816

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  "Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
  $endgroup$
  – marcelm
  May 22 at 15:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yes, sorry 200mV
  $endgroup$
  – hekete
  May 23 at 3:00
  

  
  
  
  

add a comment | 

1

$begingroup$

Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 200mV.

There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.

For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...

share|improve this answer

edited May 23 at 2:59

answered May 22 at 13:50

heketehekete

29816

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  "Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
  $endgroup$
  – marcelm
  May 22 at 15:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Yes, sorry 200mV
  $endgroup$
  – hekete
  May 23 at 3:00
  

  
  
  
  

add a comment | 

$begingroup$

Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 200mV.

There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.

For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...

share|improve this answer

edited May 23 at 2:59

answered May 22 at 13:50

heketehekete

29816

$endgroup$

share|improve this answer

edited May 23 at 2:59

answered May 22 at 13:50

heketehekete

29816

answered May 22 at 13:50

heketehekete

29816

answered May 22 at 13:50

heketehekete

29816

0

$begingroup$

If you are just using the diodes to mux two power sources then you can use an ideal diode chip.

https://www.analog.com/en/parametricsearch/11029

They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.

share|improve this answer

answered May 22 at 14:44

user4574user4574

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If you are just using the diodes to mux two power sources then you can use an ideal diode chip.

https://www.analog.com/en/parametricsearch/11029

They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.

share|improve this answer

answered May 22 at 14:44

user4574user4574

3,667512

$endgroup$

add a comment | 

$begingroup$

If you are just using the diodes to mux two power sources then you can use an ideal diode chip.

https://www.analog.com/en/parametricsearch/11029

They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.

share|improve this answer

answered May 22 at 14:44

user4574user4574

3,667512

$endgroup$

share|improve this answer

answered May 22 at 14:44

user4574user4574

3,667512

answered May 22 at 14:44

user4574user4574

3,667512

answered May 22 at 14:44

user4574user4574

3,667512