identifying devices

AudioFreak · 21st November 2001, 12:58 PM

i recently pulled apart an old power supply to use as spare parts and i have a number of 3 terminal devices that i am unable to identify as they have no clear part numbers marked on them ..... they have markings on them that look like this......

Item 1.
TO-264 package
caries a mark that looks like this:-

-|>|-|<|-

Item 2.
TO-220 package
caries a mark that looks like this:-

~ + ~

any help you can give in identifying devices would be greatly appreciated.

rtirion · 21st November 2001, 03:13 PM

The parts you salvaged are so called "double diodes" or two diodes in one package.
Usually the cathodes of each diode are connected togheter to form the center pin of TO-264 or TO-220 package so ANODE1 is on pin 1, Both CATHODES on pin2, and ANODE2 on pin3. You could (and should) verify this with a simple DVM with a diode test.

walker · 21st November 2001, 10:19 PM

Rtirion, your right but I'd like to add that common anode devices are just as common, (in my experience) as common cathode.
Regards WALKER

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21st November 2001, 12:58 PM	#1
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	i recently pulled apart an old power supply to use as spare parts and i have a number of 3 terminal devices that i am unable to identify as they have no clear part numbers marked on them ..... they have markings on them that look like this...... Item 1. TO-264 package caries a mark that looks like this:- -\|>\|-\|<\|- Item 2. TO-220 package caries a mark that looks like this:- ~ + ~ any help you can give in identifying devices would be greatly appreciated.

21st November 2001, 03:13 PM	#2
rtirion diyAudio Member Join Date: Nov 2000	The parts you salvaged are so called "double diodes" or two diodes in one package. Usually the cathodes of each diode are connected togheter to form the center pin of TO-264 or TO-220 package so ANODE1 is on pin 1, Both CATHODES on pin2, and ANODE2 on pin3. You could (and should) verify this with a simple DVM with a diode test.

21st November 2001, 10:19 PM	#3
walker diyAudio Member Join Date: Nov 2001 Location: Perth West Australia	Rtirion, your right but I'd like to add that common anode devices are just as common, (in my experience) as common cathode. Regards WALKER