Fast recovery diode query

[N_Cook]

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.

 

[Eeyore]

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

 

[legg]

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

 

[Sam Goldwasser]

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.

 

[neon]

color nends on diodes are obsolete meaning germanium