21 Apr 2008 10:30:58

N_Cook

Fast recovery diode query

Firstly is "fast recovery" diode = = "high speed" diode? I have 2 ok diodes of originally 3 on a board, one missing. 1N4148 in size and form but known to be fast recovery types. Is there a non-destructive test I could say graph-out sub 10mA and sub 20V plots of something of one and infer something about their manximum ratings? They have 2 green colour bands and one thick blue band. I've scanned through a listing of 1500 fast recovery diodes of less than 100mA rating for 55 and a 6 in the type numbers but nothing found.

21 Apr 2008 12:05:07

Eeyore

Re: Fast recovery diode query

N_Cook wrote: > Firstly is "fast recovery" diode = = "high speed" diode? Basically yes. > I have 2 ok diodes of originally 3 on a board, one missing. 1N4148 in size > and form but known to be fast recovery types. Well ... diodes that small usually are fast types anyway. It's only 'power diodes' (usually 1A rated and above) that are slow enough for there their fast equivalents to be separately designated. Graham

21 Apr 2008 07:47:35

legg

Re: Fast recovery diode query

On Mon, 21 Apr 2008 10:30:58 +0100, "N_Cook" <diverse@tcp.co.uk > wrote: >Firstly is "fast recovery" diode = = "high speed" diode? > >I have 2 ok diodes of originally 3 on a board, one missing. 1N4148 in size >and form but known to be fast recovery types. Don't assume the missing one is the same type, or even required, if not present. RL

21 Apr 2008 08:29:19

Sam Goldwasser

Re: Fast recovery diode query

"N_Cook" <diverse@tcp.co.uk > writes: > Firstly is "fast recovery" diode = = "high speed" diode? > > I have 2 ok diodes of originally 3 on a board, one missing. 1N4148 in size > and form but known to be fast recovery types. How do you know? > Is there a non-destructive test I could say graph-out sub 10mA and sub 20V > plots of something of one and infer something about their manximum ratings? Nothing I'd trust. > They have 2 green colour bands and one thick blue band. I've scanned through > a listing of 1500 fast recovery diodes of less than 100mA rating for 55 and > a 6 in the type numbers but nothing found. What sort of circuit are these in? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.