[sdiy] 1N4001 equivalent in SOT-23?

[Harry Bissell]

If its for series reverse protection, it will probably be OK. If it is for SHUNT reverse protection, avoid SMT parts.
The heat will build up way too fast.

SMT parts may be rated of 1A (or 5A, or 10A...) but their thermal resistance Tj-a (junction to ambient) is absurdly high.

Figure out the power required in normal and overload operation, then multiply by that Tj-a to see how hot the junction will get.

That does not even mention how fast it will get there (transient thermal impedance can predict that...0

H^) harry   (now singing "set the controls for the heart of the sun...")


----- Original Message -----
From: John Loffink <jloffink at austin.rr.com>
To: Justin Owen <juzowen at googlemail.com>
Cc: SDIY List <synth-diy at dropmix.xs4all.nl>
Sent: Wed, 09 Mar 2011 08:55:55 -0500 (EST)
Subject: Re: [sdiy] 1N4001 equivalent in SOT-23?

Try the DL4001 or DL4002 in a MELF (DL-41) package.

John Loffink



On 3/9/2011 7:23 AM, Justin Owen wrote:
> Hey all,
>
> Title says it all really - I'm looking or a SOT-23 replacement for the humble 1N4001. It's for a module that will be on a +/12V supply, it'll be doing reverse voltage protection in conjunction with PTC fuses and a little half-wave rectification on AC signals that shouldn't ever get more than 10V PP...
>
> The only one I've found that comes close is this:
>
> http://uk.farnell.com/nxp/pmeg2010/diode-schottky-1a-20v-sot-23/dp/1510676?Ntt=1510676
>
> ...should I be concerned that the Max Reverse Voltage is 20V (rather than the 50V of the 1N4001)? It's one of the few components I'm considering keeping as through-hole but it'd be real nice to find a suitable candidate.
>
> I'm UK-based but I've got no problem with ordering from OS.
>
> Thanks all.
>
> J
>
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> Synth-diy at dropmix.xs4all.nl
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>

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-- 
Harry Bissell & Nora Abdullah 4eva