What is a Harris C9006 800637 TO-3 package used in an oscillator/driver circuit?

Does anyone know what is a Harris C9006 800637 TO-3 package used in an oscillator/driver circuit?

The circuit is not working and this part appears to have an internal short but I don't know what it is.

I tried to get support at the Intersil website to find more info but their website hangs up and just keeps saying Please Wait.

Thanks in advance if anyone can help,

George

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It seems like it must be a transistor but I need a datasheet to find a replacement.

gbugh said:

Does anyone know what is a Harris C9006 800637 TO-3 package used in an oscillator/driver circuit?

The circuit is not working and this part appears to have an internal short but I don't know what it is.

I tried to get support at the Intersil website to find more info but their website hangs up and just keeps saying Please Wait.

Thanks in advance if anyone can help,

George

Click to expand...

Doubt it if you say it is TO-3 and looks like a transistor, but this came up in searches for C9006, Harris Semiconductors (?):

https://www.avspares.com/parts/search?parts=CD74HCT4051E&region=&page=1

This is another that doesn't seem to fit your description:

**broken link removed**

Post a photo of the board and the device itself if you are able to, that may help. Is it only three pins?

Come on now, why would I make it up?

Please see pix.

d123 said:

Doubt it if you say it is TO-3 and looks like a transistor, but this came up in searches for C9006, Harris Semiconductors (?):

Click to expand...

Almost certainly the 800637 is a house code and C9006 is date code June 1990. House codes usually have a generic equivalent but the numbers do not mean anything outside of the bill of material. The number would be chosen by the equipment manufacturer not the device manufacturer so it would be pointles to look for it in their data sheets.
I'm not absolutely certain that is the 'H' logo of Harris Semiconductors either.

What does it seem to do in the circuit, the package could equally well be a power diode or a regulator.

Brian.

It looks like it must be an NPN switching transistor. I just don't know the voltage and current limits, Hfe or switching speeds.

George

betwixt said:

What does it seem to do in the circuit, the package could equally well be a power diode or a regulator.

Brian.

Click to expand...

Definitely not in top 100 Semi corps.

Looks Chinese to me.

What's a good cheap switching low saturation NPN TO-3 transistor that can handle at least 250V 10A and have enough gain to insure oscillations start? Switching frequency about 50KHz.

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Switching frequency about 50KHz.

A better question is what is the make and model of the equipment it comes from. Rather than guess at specifications, the first course of investigation is to track down what the original might be. Possibly a manual or schematics are available, even if the exact part can't be traced, a more acurate estimation of likely limits can be made if it's place within a circuit can be seen. "enough gain to insure oscillations" depends on so many other factors it is impossible to quantify.

Brian.

"Come on now, why would I make it up?"

Hi,
Sorry - misunderstanding by use of words, didn't mean doubted what you described... I meant that I doubted that any of the ICs in the avspares list had anything to do with your reference number; I was puzzled as to why it brought up 74 type ICs.

That thing is enormous!

No problemo, sorry I took it the wrong way.

I think I just need to look for a cheap switching TO-3 NPN transistor , maybe 250V or higher with about 10A capability.

I'm going to try a BUX32B.

gbugh said:

No problemo, sorry I took it the wrong way.

I think I just need to look for a cheap switching TO-3 NPN transistor , maybe 250V or higher with about 10A capability.

I'm going to try a BUX32B.

Click to expand...

Try if you like but it has poor gain and Rce
hFE= 8 ~40 @ 3.0/6.0 (Vce / Ic ) implies Rce= 500 millOhm

8 is low and 500 mOhm is high

Try Diodes Inc look for hFE=20~50 min @1V/10A or 100 mOhm and otherwise hFE >500

SunnySkyguy said:

Try if you like but it has poor gain and Rce
hFE= 8 ~40 @ 3.0/6.0 (Vce / Ic ) implies Rce= 500 millOhm

8 is low and 500 mOhm is high

Try Diodes Inc look for hFE=20~50 min @1V/10A or 100 mOhm and otherwise hFE >500

Click to expand...

I know what you mean but I don't see any TO-3 packages at the Diodes Inc website.

I was looking for much higher hfe transistors but wasn't finding much. I'm afraid to use a Darlington because I'm thinking the original transistor wasn't Darlingtion so if I install a Darlingtion I might get spurious oscillations at higher than the intended frequency of oscillation.

Here's what I found:

BUF420M 850v 30a hfe=3
Bux48a 450v 15a hfe=5
bux98c 450v 30a hfe=5
NTE2319 450v 15a hfe=5
2n6308 350v 8a hfe=3
bu208 700v 8a hfe=2.2
nte52 450 5a hfe=8
2n6678 400v 15a hfe=2
bux32b 500v 8a hfe=8min 40 max
2n3902 400v 3.5a hfe=25
NTE162 450v 10a hfe=15
BU606D 400v 10A hfe=10 (low saturation)
2T7043 400v 10a hfe=15

I choose the BUX32B because it was cheaper and about as good as the others I was finding, but I will try one of the others or keep looking.

As this component is part of an oscillator/driver (frequency not given). Its either a part or is the Vcc stabiliser circuit. Or if the driver is producing 10W of MF, it could be the actual RF output device.
As you have removed the device, power the unit up and check on the connections which went to the device. If you find 10V of RF on one, it gives the game away. If it just has some DC volts on one pin, its was part of the Vcc stabiliser.
Frank

It is for driving ultrasonic piezo elements. The 2 same type transistors are connected in what looks like kind of a push pull configuration driving an output transformer at ultrasonic frequencies. The 2 transistors are the only active devices on the card. The output is also feed back to an input transformer that drives both transistors after a phase shift so as to set the oscillation frequency.

The tops of the output transformer's dual primary coils on 1 ferrite toroid are each connected to 120VDC with the other side of each primary going to the collector of each transistor.

So I'm pretty sure these are something like horizontal flyback type of transistors or switching power supply type transistors but used for ultrasonics.

Maybe I could use more modern power mosfets that ran cool enough that I don't even need the TO-3 heatsinks and so then I don't really have to stay with TO-3 packages just to match the heatsink since I can get rid of the heatsinks.

George

You are now getting closer, transistor needs Vceo > 250 V, significant gain at ultra sonic frequency, Hfe > 10 @40 KHZ @ Ic (Po =?), so NPN/PNP? Line output device looks like a suitable candidate.
Frank