Ian Field wrote:
"Robert Baer" wrote in message
net...
Ian Field wrote:
"Robert Baer" wrote in message
net...
Ian Field wrote:
"Robert Baer" wrote in message
...
Ian Field wrote:
"Grant" wrote in message
...
On Wed, 25 May 2011 18:12:11 +0100, "Ian Field"
wrote:

"John Larkin" wrote in
message
...
On Mon, 23 May 2011 16:35:57 -0700, Tim Wescott

wrote:

On 05/23/2011 03:52 PM, Jim Thompson wrote:
Is this the correct pin out for a 2N7000...

http://analog-innovations.com/SED/2N...ak_Pin_Out.pdf

My expectations, from bipolar's, would be, facing the flat,
leads
down. left-to-right...

D-G-S
My expectations, from browsing many data sheets, is that the
pinout of
any three-terminal device is pretty well standardized:

Pin 1: random
Pin 2: random
Pin 3: random
Even the pin numbers can be random. I've seen all possible
permutations of 1-2-3 on various SOT23 parts. We use the
"Motorola"
convention, and force any parts that we use into it.

So, maybe the 2N7000 is a little randomer than you thought --
it's still
normal.
All you need is a ohmmeter to discover/verify the pinout.
What I use is a Steinel continuity checker, it has a 12V keyfob
battery & 2
LEDs. Stick the + probe on the drain and the - on source, usually
stray
charge will cause enough conduction to make the LED glow, breifly
moving
the - probe to gate discharges it then back to source and no light
means
good MOSFET, move the positive to the gate to charge it and it
conducts
again.

With unknown leadouts its relatively simple to identify the gate as
there's
no continuity to either other terminal either way round. Which way
round the
body diode is tells you half of what else you need to know.

A decent meter identifies the body diode by voltage drop, not
continuity.

Meter I'm using here is half the price I paid for decent test leads
for it

So knowing which two pins hold the body diode unambiguously identify
the
three pins for me.

About half the time there will be enough stray charge on the gate to
make it difficult to tell between diode & channel conduction - at
some point you'll have to guess the channel polarity and precharge
the gate capacitance with the right polarity to cause channel cutoff.

Its a quicker route to find out which pin doesnt continuity to
anywhere, then figure out which polarity there turns what's between
the other 2 pins into a 1 way street.
BZZZZAAAP! the GATEway to FETus NONworkus.
Well if you will insist on continuity testing with mains & a 100W
bulb...........................
All you have to do is touch the gate first and PAFF!
ESD-itus!
Serves you right for sprinting 30 laps round a nylon carpet before
testing MOSFETs.
Don't be an ass.

You (apparently) loads of blown gates - me no blown gates.

Tell me again, who's the ass.


You sure make a lot of false ASS-u-ME-tions.