11 Feb
2014
11 Feb
'14
2:49 p.m.
From: allison: Tuesday, February 11, 2014 6:05 AM
On 02/11/2014 07:49 AM, Michael Thompson wrote:
My understanding of the difference between a D662 and a D664 is that
the D664 is supposed to be a fast switching diode with a low forward
voltage drop. The D662 is a similar diode, but requires a known, fairly
high forward voltage drop. (I'd recommend select 1N914 or 1N4148
for the D662, but only some manufacturers have forward voltage drops
of 0.75V.) Unfortunately, forward voltage drop doesn't seem to be a
thing that part numbers of modern switching diodes routinely control.
The D664, however, wants the forward drop as low as possible. Some
1N914 and 1N4148 will fit the bill, but others won't. If you are looking
for a general purpose substitution (rather than a specific application),
the 1N4154 should work well. (When I studied the issue, I didn't find
any manufacturers of 1N4154 which had high forward voltage drops.)
Hope that helps,
Vince
The RICM needs to repair a S603 triple pulse
amplifier flip-chip. The
failed diode is listed as a DEC D-664. The DEC enthusiast cross-reference
lists show it as a 1N3606. These diodes are nearly impossible to find. Can
someone recommend a substitution for the 1N3606 diode?
A quick lookup suggests that 1n914 or 1n4148 are suitable choices.
These are
very common fast switching doides.