If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Probably via google search. That just looks like regular N channel MOSFET with a highish on-state resistance. You should be able to substitute it for an IRFP260 or similar.
Registered Member #4324
Joined: Mon Jan 09 2012, 03:16AM
Location: Surrey, BC, Canada
Posts: 35
Figured I could use an IRFP250 but couldn't find one so I tried a 260 out of stock so I ended up with a 360.
Its a pin the butt tring to put something together and it takes 3 hours just trying to find a part. Hoping there is a cross reference somewhere where I can type in 2SK1796 and comes back with IRFP250, or BU508 or 2N3055 etc etc.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Equivalents for semiconductors is fraught with difficulty.
In the bad old days, vaccuum tubes could be made to be equivalent to others, because the macroscopic geometry was easy to specify and copy.
What's possible with semiconductors is so tied up with the detailed process, that even if you know how a die is built, it may be impossible to copy it on a different process. So there are rarely 100% form-fit-function equivalents out there.
Many of the larger manufacturers will have cross reference searches on their website, IRF does for instance. However, if you put 2SK1796 in there, it comes up with no matches.
What is adequate to use as a substitute will depend on the application. For instance it is usually safe when replacing a FET to use one with the higher current and higher voltage capacity - so far so good. But what if it needs more gate charge, or is slower to switch, that may or may not matter. What if it has a different avalanche withstand energy or breakdown voltage? Just which of these secondary, tertiary, or undocumented features make a difference to the circuit? Something that has often bitten me is a new process. Hey, this part has better current, voltage, on resistance, gate charge, switching time, everything. Bang, I missed the lower max gate voltage!
Unless you are trying to substitute a cooking-grade NPN signal transistor (use BC848) or a small but grunty mains rectifier (use 1N5406), there is often no alternative but to reverse engineer the circuit, understand what matters, and respecify the part from scratch.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
NTE make a living out of doing exactly this. You can enter your part number at their website and it'll recommend a NTE equivalent. Unfortunately they tend to fail for the reasons Dr. Slack just explained. In the electronic repair business they have a reputation as overpriced junk merchants.
Knowing your components is actually quite a big part of electronic engineering. Most decent-sized companies have at least one full-time component engineer to deal with stuff like this.
I've never even seen a 2SK1796. Did it come out of an audio amp?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i spend several hours every few days on alldatasheet.org and others.
As for steves point, i whole hartedly agree with those who say NTE is crap, it definatley is. ive even seen them cover with paint the original part mark, then spary theirs on, which really pisses me off. in most cases, ive seen their datasheets are more brief than the original chip maker.
there should be college courses based on this, but i havent seen any.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Substitute parts..
