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Equivalent NPN Transistor for 8560E

 

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Tracked down the fault in a 8560E to failure of the regulator transistor in the 100Mhz VCXO. Substituted the supply and the oscillator circuit is drawing little current so I am not sure why it would have failed except there is evidence someone changed the crystal so might have been their fault.

The transistor is listed is a 1854-1094 or manufacturer part number PTX2222A. Google this results in a lot of Japanese and NPN thrown in the mix. The Equivalents List says it is a MTX2222A which is also a mystery.

I am assuming it is a SMD style 2N2222A but the under body solder pad with the 4 legs has me a bit concerned it might be something special. Anyone know this device? ? ?

Dave
 

1) You have your Xs and Ts transposed.

2) Looks like it crosses to a CXT2222A currently in stock at Mouser and likely others. The "extra" lead in the body is just like the tab on a TO-220 case; in this case it's the collector as is the center pin.

Dave Casey


On Mon, Apr 8, 2019 at 5:31 AM Dave Ireland <mirrors@...> wrote:

Tracked down the fault in a 8560E to failure of the regulator transistor in the 100Mhz VCXO. Substituted the supply and the oscillator circuit is drawing little current so I am not sure why it would have failed except there is evidence someone changed the crystal so might have been their fault.

The transistor is listed is a 1854-1094 or manufacturer part number PTX2222A. Google this results in a lot of Japanese and NPN thrown in the mix. The Equivalents List says it is a MTX2222A which is also a mystery.

I am assuming it is a SMD style 2N2222A but the under body solder pad with the 4 legs has me a bit concerned it might be something special. Anyone know this device? ? ?

Dave
 

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Took a little amount of sleuthing, but I f you search for pxt2222a115 it appears to be an ordinary 2222 variant. The tab, opposing middle pin and “heatsink” are all one pin; the collector.?

Here’s an Octopart link, and you can get them on eBay too:
https://datasheet.octopart.com/PXT2222A%2C115-Nexperia-datasheet-87582290.pdf

-d

?

From: [email protected] on behalf of Dave Ireland <mirrors@...>
Sent: Monday, April 8, 2019 5:31 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Equivalent NPN Transistor for 8560E
?

Tracked down the fault in a 8560E to failure of the regulator transistor in the 100Mhz VCXO. Substituted the supply and the oscillator circuit is drawing little current so I am not sure why it would have failed except there is evidence someone changed the crystal so might have been their fault.

The transistor is listed is a 1854-1094 or manufacturer part number PTX2222A. Google this results in a lot of Japanese and NPN thrown in the mix. The Equivalents List says it is a MTX2222A which is also a mystery.

I am assuming it is a SMD style 2N2222A but the under body solder pad with the 4 legs has me a bit concerned it might be something special. Anyone know this device? ? ?

Dave
 

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Doug

Thanks for that good detective work.

Looks like a 2222 will get it going in the short term while I fault find the long list of alarms.

Thanks again.

Dave


Sent from my Samsung GALAXY S5


-------- Original message --------
From: Doug Bercich <doug@...>
Date: 8/04/2019 19:30 (GMT+08:00)
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Equivalent NPN Transistor for 8560E

Took a little amount of sleuthing, but I f you search for pxt2222a115 it appears to be an ordinary 2222 variant. The tab, opposing middle pin and “heatsink” are all one pin; the collector.?

Here’s an Octopart link, and you can get them on eBay too:
https://datasheet.octopart.com/PXT2222A%2C115-Nexperia-datasheet-87582290.pdf

-d

?
From: [email protected] on behalf of Dave Ireland <mirrors@...>
Sent: Monday, April 8, 2019 5:31 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Equivalent NPN Transistor for 8560E
?

Tracked down the fault in a 8560E to failure of the regulator transistor in the 100Mhz VCXO. Substituted the supply and the oscillator circuit is drawing little current so I am not sure why it would have failed except there is evidence someone changed the crystal so might have been their fault.

The transistor is listed is a 1854-1094 or manufacturer part number PTX2222A. Google this results in a lot of Japanese and NPN thrown in the mix. The Equivalents List says it is a MTX2222A which is also a mystery.

I am assuming it is a SMD style 2N2222A but the under body solder pad with the 4 legs has me a bit concerned it might be something special. Anyone know this device? ? ?

Dave
 

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Dave C

Opps you are right about the swap of letters, I guess that make it more difficult.

Thanks for looking it up.

Dave I


On 8/04/2019 6:47 pm, Dave Casey wrote:

1) You have your Xs and Ts transposed.

2) Looks like it crosses to a CXT2222A currently in stock at Mouser and likely others. The "extra" lead in the body is just like the tab on a TO-220 case; in this case it's the collector as is the center pin.

Dave Casey

On Mon, Apr 8, 2019 at 5:31 AM Dave Ireland <mirrors@...> wrote:

Tracked down the fault in a 8560E to failure of the regulator transistor in the 100Mhz VCXO. Substituted the supply and the oscillator circuit is drawing little current so I am not sure why it would have failed except there is evidence someone changed the crystal so might have been their fault.

The transistor is listed is a 1854-1094 or manufacturer part number PTX2222A. Google this results in a lot of Japanese and NPN thrown in the mix. The Equivalents List says it is a MTX2222A which is also a mystery.

I am assuming it is a SMD style 2N2222A but the under body solder pad with the 4 legs has me a bit concerned it might be something special. Anyone know this device? ? ?

Dave

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