Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] Diode switching info from datasheet

Status
Not open for further replies.
I

i200yrs

Full Member level 2
Joined
Aug 23, 2016
Messages
146
Helped
1
Reputation
2
Reaction score
2
Trophy points
18
Activity points
1,073
Hello all...I learned that in searching for diode substitute the faster switching time is the better. But the problem i am not able to see where from diode datasheet i can find the switching time. Example diodes are U1JC44 and 1N4006. Anyone please help...thanks a lot/.
 

Both of those diodes are intended to be used as rectifiers, not switching diodes. Thus, switching time is an irrelevant parameter. You need to look for switching diodes.
 

yes, you should seek "schottky" diodes, or "ultra fast" diodes.
The general parameter of interest is the "reverse recovery time", trr
It should be low as possible generally
 
treez said:
yes, you should seek "schottky" diodes, or "ultra fast" diodes.
The general parameter of interest is the "reverse recovery time", trr
It should be low as possible generally
Click to expand...

I opened both diode with part numbers KDZ24VV and U1JC44 but have NOT seen any trr :-(
 

Hi,

KDZ24 is a zener: It is no switching diode, no ultra fast, no schottky .... Why did you select it? Read post#2 and 3

U1JC44 is a rectifier diode, and it is not recommended for new designs....Why did you select it? Read post#2 and 3

If you ask for help it is necessary that you read the answers and follow the recommendations.

Klaus
 

Hi,

Look for small signal diode, unless you need a high current device.

The images are from the 1N4148 datasheet, Trr is in numbers in the electrical characteristics, and there is also a graph to represent Trr vs Irr (top right-hand side).

When you are browsing datasheets look for those parameters in the specs and check the graphs in case they show the/additional info.

The 1N4007 (and 1N4006) rectifier diode doesn't show that info, nor does the SS15 Schottky.
 

Attachments

  • 4148 specs.JPG
    4148 specs.JPG
    102.5 KB · Views: 112
  • 4148 trr graph.JPG
    4148 trr graph.JPG
    88.1 KB · Views: 105
KlausST said:
Hi,

KDZ24 is a zener: It is no switching diode, no ultra fast, no schottky .... Why did you select it? Read post#2 and 3

U1JC44 is a rectifier diode, and it is not recommended for new designs....Why did you select it? Read post#2 and 3

If you ask for help it is necessary that you read the answers and follow the recommendations.

Klaus
Click to expand...

Thanks mr Klaus...actually i am searching for the substitute of both diodes (KDZ24 , U1JC44 ) and i come to know that switching is important...thanks

- - - Updated - - -

d123 said:
Hi,

Look for small signal diode, unless you need a high current device.

The images are from the 1N4148 datasheet, Trr is in numbers in the electrical characteristics, and there is also a graph to represent Trr vs Irr (top right-hand side).

When you are browsing datasheets look for those parameters in the specs and check the graphs in case they show the/additional info.

The 1N4007 (and 1N4006) rectifier diode doesn't show that info, nor does the SS15 Schottky.
Click to expand...

Hello d123...good day.. thanks for the guidance...by the way, any idea what are the key parameters to find a substitute for zener diode? thanks
 

You still don't seem to get it. WHY do you keep insisting that you need to know the switching characteristics for a regulator diode? REGULATOR DIODES DON'T SPECIFY SWITCHING CHARACTERISTICS. If you actually do have an application in which switching characteristics are important then DON'T USE A REGULATOR DIODE!!
 

barry said:
You still don't seem to get it. WHY do you keep insisting that you need to know the switching characteristics for a regulator diode? REGULATOR DIODES DON'T SPECIFY SWITCHING CHARACTERISTICS. If you actually do have an application in which switching characteristics are important then DON'T USE A REGULATOR DIODE!!
Click to expand...

I get it actually...but maybe my previous messages was not that clear to you, could be a wrong words I used (sorry for that)...thanks
 

Hi,

i200yrs said:
what are the key parameters to find a substitute for zener diode? thanks
Click to expand...

Read the KDZ24 datasheet, that way you can compare similar parts. I think most important general parameters are Zener voltage, max surge current, wattage. KDZ24 is a 24V Zener, the main specs are here.

Hopefully you know the circuit enough to have an idea of the current and therefore max wattage the Zener will see. Here's, for example, the RS-Online 24V Zener list, you can see the datasheets for each part.

re the U1JC44, the Toshiba rectifier, an equivalent part should be either of these two: 1N4005, Vishay or Diodes Inc 600V, 1A.
 
d123 said:
Hi,



Read the KDZ24 datasheet, that way you can compare similar parts. I think most important general parameters are Zener voltage, max surge current, wattage. KDZ24 is a 24V Zener, the main specs are here.

Hopefully you know the circuit enough to have an idea of the current and therefore max wattage the Zener will see. Here's, for example, the RS-Online 24V Zener list, you can see the datasheets for each part.

re the U1JC44, the Toshiba rectifier, an equivalent part should be either of these two: 1N4005, Vishay or Diodes Inc 600V, 1A.
Click to expand...


Great! thanks for the efforts!
 

Hi,

I don´t understand why your headline is "Diode switching info from datasheet".

If you just want to look for a replacement then do an internet serach on "xxx replacement", or "xxx cross reference".

Klaus
 

KlausST said:
Hi,

I don´t understand why your headline is "Diode switching info from datasheet".

If you just want to look for a replacement then do an internet serach on "xxx replacement", or "xxx cross reference".

Klaus
Click to expand...

My apology mr KlausST, yes actually i did search a replacement...but i found one site saying to find a diode replacement you need to consider the switching rate. And so i look for it from the datasheet but i can't find switching rate.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top