Motorola SJ9089A - Electronic Circuits Projects Diagrams Free

Kirt · 9th November 2008, 01:38 PM

I am looking for a datasheet for a Motorola SJ9089A transistor used in a Mettler ultrasonic cleaner.
I found a posting on this site that says you can use a MJ16018 as a substitute. I tried that transistor and also tried an NTE replacement. Both seemed to work in the circuit, but caused a 450v 4.7mf cap to heat up and explode. The circuit continues to work without the cap until the unit is shut down. The next time you start the unit it blowes the fuse and the transistor is shorted. This device has two identical circuits that drive 2 transducers. If I swap the transistors the the circuit with the original SJ9089A always works fine.

hotwaterwizard · 11th November 2008, 07:28 AM

SJ9089A cross

hobid Has them OEM Electronic Component IC Inventory, Military Aircraft Aerospace Marine Automotive Parts

Kirt · 11th November 2008, 12:29 PM

Thanks for the response, but I have tried Hobid and gotten no response. I have pretty much given up on finding the original part, but was hoping to find a datasheet so I can try to cross reference to another transistor. Still, I would take an original if I could find it.

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9th November 2008, 01:38 PM	#1
Kirt	SJ9089A Motorola Transistor I am looking for a datasheet for a Motorola SJ9089A transistor used in a Mettler ultrasonic cleaner. I found a posting on this site that says you can use a MJ16018 as a substitute. I tried that transistor and also tried an NTE replacement. Both seemed to work in the circuit, but caused a 450v 4.7mf cap to heat up and explode. The circuit continues to work without the cap until the unit is shut down. The next time you start the unit it blowes the fuse and the transistor is shorted. This device has two identical circuits that drive 2 transducers. If I swap the transistors the the circuit with the original SJ9089A always works fine. Last edited by Kirt; 9th November 2008 at 02:19 PM. Reason: Change title

11th November 2008, 07:28 AM	#2
hotwaterwizard	SJ9089A cross hobid Has them OEM Electronic Component IC Inventory, Military Aircraft Aerospace Marine Automotive Parts __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com Last edited by hotwaterwizard; 11th November 2008 at 07:49 AM.

11th November 2008, 12:29 PM	#3
Kirt	Thanks for the response, but I have tried Hobid and gotten no response. I have pretty much given up on finding the original part, but was hoping to find a datasheet so I can try to cross reference to another transistor. Still, I would take an original if I could find it.