Re: Lead spacing for through hole resistor



Spehro Pefhany wrote:

On Sun, 04 Jun 2006 21:47:44 +0100, the renowned Pooh Bear
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:



Spehro Pefhany wrote:

On Sun, 04 Jun 2006 19:53:07 GMT, the renowned Roy L. Fuchs
<roylfuchs@xxxxxxxxxxxxxxxxxxxx> wrote:

On Sun, 04 Jun 2006 09:58:25 -0500, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> Gave us:

If the dissipation is miniscule, I agree.

But, if the resistor is dissipating a sizable fraction of its rating
I'd be leery of mounting it vertically without getting some
temperature data.

In either vertical OR horizontal mounting (without a reasonable space
between it and the PCB), I would say that one should be leery of
either choice.

Hundreds of millions of portable transistor radios were made with most
of the axial-lead components mounted vertically on the cheapest
paper-based phenolic boards. They were pretty reliable.

That kind of stuff used resistors that had 'enamelled' leads to prevent
inadvertent shorts and a kinked lead to help relieve the mechanical joint at the
pcb.

Graham

Oh, but that high tech stuff came later. The early ones often had
plastic tubing on the leads, or nothing at all.

I've got an old BT ( actually Post Office Telecommunications ) modem somewhere that
has many of the components mounted in stress relieving cradles. Some even have a
stress relief loop on the leads !

Graham


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