Texas Instruments "325" in a TO-18 can? - Electronic Circuits Projects Diagrams Free

systemloc · 19th April 2009, 06:15 PM

I picked up a grab bag full of these, NOS. Three leads from the bottom in a large can. The top has a TI brand logo on it with "325". The side has "4561439" silkscreened. then added on with ink to that is ".2", so it's "4561439.2" all together.

I can't seem to ID this. Using an ohmmeter, it doesn't seem to correspond to a transistor at all. Pin 1 and 2 conduct in both directions, and neither conduct to pin 3 in either direction. Pin 3 conducts with the casing in both directions.

Sounds almost like a depletion mode MOSFET, but the gate shouldn't be connected to the casing... ?

Thank you for any info!!

systemloc · 19th April 2009, 09:33 PM

I tried putting some voltage across Pins 1 and 2. The drop was only 0.15 V?? That's too low to be a Silicon junction. Also, putting negative or positive voltage on pin 3 did not affect the conductance.

systemloc · 19th April 2009, 09:59 PM

Ahh, more info.. My mistake.. The can appears to be a TO-5 or TO-39. According to this site, the TO-18 is the smaller can.

The device in question has a diameter at the top of slightly less than 8mm.

systemloc · 19th April 2009, 10:07 PM

On the Transistor Museum Site, there's an article about a TI 2N33x. Apparently, the 2N335 launched in 1958 and was used on the first U.S. space satellite. The date code on that site suggests my part was made in 1954, week 39 (date code 439). Wow that's old..

speakerguy79 · 21st April 2009, 06:09 PM

Interesting. Would you be willing to sell me one/a few? I'd like to have a couple just for historical value.

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19th April 2009, 06:15 PM	#1
systemloc	Texas Instruments "325" in a TO-18 can? I picked up a grab bag full of these, NOS. Three leads from the bottom in a large can. The top has a TI brand logo on it with "325". The side has "4561439" silkscreened. then added on with ink to that is ".2", so it's "4561439.2" all together. I can't seem to ID this. Using an ohmmeter, it doesn't seem to correspond to a transistor at all. Pin 1 and 2 conduct in both directions, and neither conduct to pin 3 in either direction. Pin 3 conducts with the casing in both directions. Sounds almost like a depletion mode MOSFET, but the gate shouldn't be connected to the casing... ? Thank you for any info!! __________________ KI4TJ Last edited by systemloc; 19th April 2009 at 09:58 PM.

19th April 2009, 09:33 PM	#2
systemloc	I tried putting some voltage across Pins 1 and 2. The drop was only 0.15 V?? That's too low to be a Silicon junction. Also, putting negative or positive voltage on pin 3 did not affect the conductance. __________________ KI4TJ

19th April 2009, 09:59 PM	#3
systemloc	Ahh, more info.. My mistake.. The can appears to be a TO-5 or TO-39. According to this site, the TO-18 is the smaller can. The device in question has a diameter at the top of slightly less than 8mm. __________________ KI4TJ

19th April 2009, 10:07 PM	#4
systemloc	On the Transistor Museum Site, there's an article about a TI 2N33x. Apparently, the 2N335 launched in 1958 and was used on the first U.S. space satellite. The date code on that site suggests my part was made in 1954, week 39 (date code 439). Wow that's old.. __________________ KI4TJ

21st April 2009, 06:09 PM	#5
speakerguy79	Interesting. Would you be willing to sell me one/a few? I'd like to have a couple just for historical value.