Do you recognize this transistor?

[ali_asadzadeh]

Hi
Do you recognize this transistor? I can not find any thing on C8918

[TimFox]

I believe "8918" is the transistor manufacturer's date code:  18th week of 1989.
The "1848-4394" is the "private" code assigned by the instrument's manufacturer for his order with the transistor manufacturer.
Is this an -hp- unit?

[ali_asadzadeh]

Thanks Timfox for the tip, do you have any datasheet or suggestion replacement for this part?
My customer sends it, I should ask them about it to see if it's hp,

[TimFox]

Thanks Timfox for the tip, do you have any datasheet or suggestion replacement for this part?
My customer sends it, I should ask them about it to see if it's hp,

I looked for that eight-digit number, but could find nothing useful.
If you know the manufacturer of the unit (the first four digits may not be -hp-), you might find an appropriate index online for that company.

[coppice]

PRX should be Powerex. Consider that any semiconductor marked C plus 4 digits might mean 2SC plus those 4 digits. However, in this case I think Tim is right. 8918 is the date, and 1848-4394 is probably a customer specific code for a customised part. HP being the likely candidate.

[floobydust]

Thread is not useful without a model # or make

[schmitt trigger]

Many electronic designs employ catalog semiconductors screened to a particular performance specification. If you are a large enough customer, semiconductor vendors will gladly do that for you and write on the transistor your own house number.
I even worked for a company which purchased close to 100,000 power transistors per week. In that instance, the vendor actually tweaked the process of a catalog item in order to better meet our specific requirements. And obviously, it had a house number.