Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > General Electronics Technical Discussion
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 03-13-2019, 04:56 PM   #1
Spork Schivago
Your Awesomeness
 
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,552
Default Help finding a suitable replacement FCHS30A08

Hello Everyone!

I need a replacement FCHS30A08 Schottky Barrier Diode (common cathode) but I do not want to order over-seas and am having trouble locating one in the states.

Could someone recommend a suitable replacement for digikey or mouser?

I have attached the datasheet for the component. It's an 80V 30A Schottky Barrier Diode.

Thanks!
Attached Files
File Type: pdf datasheet.pdf (243.4 KB, 4 views)
__________________
-- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full
Spork Schivago is offline   Reply With Quote
Old 03-13-2019, 05:29 PM   #2
R_J
Badcaps Veteran
 
Join Date: Jun 2012
City & State: ☻
My Country: Canada
I'm a: Professional Tech
Posts: 3,497
Default Re: Help finding a suitable replacement FCHS30A08

I did'nt check all the specs that close but, Vishay VF60100C could work
Or Taiwan Semiconductor, MBRF30200CT

That is a full isolated tab correct?

Last edited by R_J; 03-13-2019 at 05:35 PM..
R_J is offline   Reply With Quote
Old 03-14-2019, 12:11 AM   #3
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 20,229
Default Re: Help finding a suitable replacement FCHS30A08

old pc power supply's will have suitable diodes
stj is online now   Reply With Quote
Old 03-14-2019, 02:41 PM   #4
Spork Schivago
Your Awesomeness
 
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,552
Default Re: Help finding a suitable replacement FCHS30A08

Quote:
Originally Posted by R_J View Post
I did'nt check all the specs that close but, Vishay VF60100C could work
Or Taiwan Semiconductor, MBRF30200CT

That is a full isolated tab correct?
I see for the Vishay VF60100C, it's rated 100V, 60A. That doesn't matter? Is that just the max values?

When the original says 80V 30A, is that per 30A per diode or 30A total?

Thanks!
Spork Schivago is offline   Reply With Quote
Old 03-14-2019, 02:42 PM   #5
Spork Schivago
Your Awesomeness
 
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,552
Default Re: Help finding a suitable replacement FCHS30A08

Quote:
Originally Posted by stj View Post
old pc power supply's will have suitable diodes
What would I need to pay attention to from the original components datasheet?

If I find one that says common cathode and is rated at least 80V 30A, I can use it?

Thanks!
Spork Schivago is offline   Reply With Quote
Old 03-14-2019, 04:10 PM   #6
Spork Schivago
Your Awesomeness
 
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,552
Default Re: Help finding a suitable replacement FCHS30A08

I also got another diode, part of the charge pump circuit I believe, which I found shorted out.

The numbers on this diode are:
Code:
LT5135
SB5150
This diode, along with two others, appear to be directly connected to the output of a transformer. I worry with this Visio there might be more wrong. Maybe I'll post a pic in the TV section.
Spork Schivago is offline   Reply With Quote
Old 03-14-2019, 10:06 PM   #7
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 20,229
Default Re: Help finding a suitable replacement FCHS30A08

SB5150 is the part, the S stands for schottky.

and yes, you can use a part with higher numbers - they are just the maximum values it can withstand.
stj is online now   Reply With Quote
Old 03-15-2019, 11:53 AM   #8
Spork Schivago
Your Awesomeness
 
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,552
Default Re: Help finding a suitable replacement FCHS30A08

Yup, I should have said the SB5150 is the part number. I believe the B stands for Barrier.
Spork Schivago is offline   Reply With Quote
Old 03-15-2019, 05:14 PM   #9
PeteS in CA
Badcaps Veteran
 
PeteS in CA's Avatar
 
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz
I'm a: Professional Tech
Posts: 2,801
Default Re: Help finding a suitable replacement FCHS30A08

If you use a 40A or 60A part, the forward drop might be a little lower (50mV-100mV?). OTOH, if you use a 100V part instead of 80V the forward drop might be a little higher. In a high current dual rectifier, I think common cathode is somewhere between extremely common and just about all there is. I have seen - in semi-ancient times - common anode dual ultrafasts, but they were very uncommon, higher price, and had high junction-case thermal resistance.
__________________
PeteS in CA

Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.

Where might is right
There is no right.
- Sophocles in "Antigone"
****************************
All that is gold does not glitter,
Not all those who wander are lost;
- J.R.R. Tolkien, The Fellowship of the Ring
****************************
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
PeteS in CA is offline   Reply With Quote
Old 03-15-2019, 07:56 PM   #10
Spork Schivago
Your Awesomeness
 
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,552
Default Re: Help finding a suitable replacement FCHS30A08

Would this STPS30H100C 100 V power Schottky rectifier work for that SOT-220-3 package diode? Could I use the STPS30H100C in place of the FCHS30A08?

I believe I could...I'll just have to bend the middle leg out a bit.
Spork Schivago is offline   Reply With Quote
Old 03-15-2019, 08:35 PM   #11
Spork Schivago
Your Awesomeness
 
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,552
Default Re: Help finding a suitable replacement FCHS30A08

For the SB5150, I have some HER305-T's that are 3A, 400V 50ns. Do you think I could use them, or do I really need 5 amp ones? I understand the HER305-T is going to have a higher Vf (1.1VDC). That's probably too much, isn't it? That's probably why they're using the Schottky instead of the rectifiers.
Spork Schivago is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 11:46 PM.
Did you find this forum helpful?