2N3565 Fairchild - Can't Find Pin Out.

[steveyraff]

Can't find the Pin Out on this exact type. Its for a Foxx Tone Machine. Tried Googling, but all the links are for different varieties.

Anyone know? Thanks for the help guys!

https://ibb.co/iVaTSS

[digi2t]

Where did you get those from. All the 3565's I've ever seen are button heads.



http://www.smallbear-electronics.mybigcommerce.com/search.php?search_query=2n3565&x=0&y=0

[steveyraff]

Where did you get those from. All the 3565's I've ever seen are button heads.

See links below. No good? 

http://vi.vipr.ebaydesc.com/ws/eBayISAPI.dll?ViewItemDescV4&item=182799623615&t=1510320817000&tid=310&category=4666&seller=ha5ia&excSoj=1&excTrk=1&lsite=3&ittenable=false&domain=ebay.co.uk&descgauge=1&cspheader=1&oneClk=1&secureDesc=0

https://www.ebay.co.uk/itm/2N3565-NPN-Transistor-FAIRCHILD-Various-Quantity/182799623615?ssPageName=STRK%3AMEBIDX%3AIT&var=690111737431&_trksid=p2057872.m2749.l2649

[digi2t]

I wouldn't say they're "no good", just that I've never seen them in that package before. If the characteristics are within what datasheets spec for a 2N3565, they should be fine.

[steveyraff]

I wouldn't say they're "no good", just that I've never seen them in that package before. If the characteristics are within what datasheets spec for a 2N3565, they should be fine.

I just have zero idea what orientation to go for - and I am fresh out of sockets. 

[Kipper4]

Have you not got a tester Stevey. For pinout.

[steveyraff]

Have you not got a tester Stevey. For pinout.

Unfortunately not. I've been very lucky to never have needed one up until now. I can almost always find the pinout. This is a first for me!

[thermionix]

Even if they don't have an emitter tab, this pinout is nearly universal for transistors with their leads arranged like that.

[reddesert]

If you have a multimeter with a diode checker you can identify whether a transistor is NPN or PNP and which terminal is the base, by checking each pair of legs as if it were a diode junction. For example, in a NPN transistor the connections from B to C and B to E will read as diodes from pos to neg with a voltage drop of about 0.4 to 0.9 V (for a silicon transistor), and the other connections won't give a voltage drop reading, i.e. they won't conduct. For PNP, the diodes point toward the base rather than away from it. Edit: I had written the polarities backwards; this is now fixed.

If you have a multimeter with a transistor tester you can identify the pinout by trying orientations (once you know the base, there are only 2 possibilities) until you get a good gain reading. The correct EBC orientation will show a higher gain than the C<->E swapped position.

If you don't have a diode or transistor checker on your multimeter you can build little circuits to do this. See http://www.zen22142.zen.co.uk/ronj/cpt.html for more information.

[Rob Strand]

If you have a multimeter with a diode checker you can identify whether a transistor is NPN or PNP and which terminal is the base, by checking each pair of legs as if it were a diode junction. For example, in a NPN transistor the connections from C to B and E to B will read as diodes with a voltage drop of about 0.4 to 0.9 V (for a silicon transistor), and the other connections won't give a voltage drop reading. For PNP, the diodes point away from the base rather than toward it.

It's not commonly known but it is possible to identify the Collector and Emitter using the Diode tester on a digital multimeter.    The voltage VBE  is larger than VBC  so the higher measurement will identify the emitter.

There's a few caveats which you rarely have to worry about:

- You need (0.001) 1mV resolution.  Pretty much all digital multimeters will do this.

- Let the measurement settle.

- Do not hold onto the transistor tightly with your fingers. 
  As the transistor heats up the voltage measurements decrease.
  If you hold the transistor for VBE and not for VBC and you can flip the measurement.


Normally if the measurements match what you thought all is good.  If not you need to check your measurements or look for another datasheet.  More often than not when it doesn't match the transistor is blown or you have read the datasheet incorrectly.

EDIT: Good example here,
http://junmingliu19.blogspot.com.au/2011/03/transistor.html

[PRR]

> this pinout is nearly universal for transistors with their leads arranged like that.

Yes. On TO-5, you can be pretty sure the E is next to the tab. And when a lead is WELDED to the case (not brought through a glass seal), that is pretty sure the C.

[Rob Strand]

On TO-5, you can be pretty sure the E is next to the tab.

Same usually holds for the button head (TO-106 small button, can't remember the larger one).  The chamfer is usually E.

[steveyraff]

Cheers dudes!