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Guru
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I Am Looking for Obsolete Transistors 2SC4953 and 2SC5392 Quantity 100 Numbers

06/23/2016 10:30 PM

I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers. Does any one know where I can get these genuine parts for old design?

I also tried equivalent but did not succeed much. Search engines also give not give any genuine source.

Perhaps someone may be keeping in stock can spare these please.

Thanks.

Shyam

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Guru

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#1

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/23/2016 11:35 PM
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Guru

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#2

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 12:16 AM
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Guru
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#3
In reply to #2

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 12:31 AM

Hello SolarEagle:

Thanks and it is great help. Let me see if I can get these parts. I have sent request to these people.

I find shipment from Aliexpress not reaching me as they ship airmail. However, FedEx can do good job as paid service.

Shyam

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Guru

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#4
In reply to #3

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 12:50 AM

Good luck....

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Guru
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#5

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 12:54 AM

You might also inquire of any usual sources whether they still have any old stock no longer catalogued.

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Guru
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#7
In reply to #5

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 3:50 AM

yes, I am hunting for all possible sources. I even tried to call Donberg to see if they can arrange. Ladies there have done it for me before. I am scared to get anything from China as counterfeit junk is very common.

Shyam

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#6

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 12:59 AM

Tcmtech may have a pile of these in some shed out in the back 40.

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Guru

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#8
In reply to #6

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 4:29 AM

Sorry no not this time. Too small for my stuff. Now if he was looking for used 600 - 1200 volt multi-hundred amp Darlington units the size of small books that I have buckets of!

At less than 800 volts 6 amps with a low wattage and gain ratings I can't see any reasons to use such an outdated transistor when there are hundreds of more moderen higher voltage switching devices, like IGBT's, Mosfets and whatnot that have far superior specs for a $1 or $2 a piece.

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Guru
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#9
In reply to #8

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 4:40 AM

Hi tcmte ch:

I am trying 500kHz to 2MHz 1kV 100W sine wave RF amplifier which is of course an old design and a friend is looking for help on this.

I would have loved to use some RCA valves as they are many in stock at places.

Yes, I can try MOSFET. IGBT may be a problem at that frequency 2MHz.

Shyam

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Guru

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#10

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 4:58 AM

Unless this is some sort of certified product relative to safety, what makes these transistors special?

What product is this used in? Analog amplifier or switching application?

The salient specification for the 2SC4953 is TO220 package, 400 volt break down, Hfe is 10. Frequency of 10Mhz, 3 amp collector current.

For the 2SC5392; TO220 package, 800 volt CE break down, Hfe 15, frequency of 15Mhz, 1.5 amp collector current.

2SC5392 is a possible replacement for both, but Ic is limited to 1.5 amps, 3 amp peak.

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Guru
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#11
In reply to #10

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 5:56 AM

hello ignator:

I am looking at replacement. Most of the Motorola transistors are also becoming obsolete. Output has to be sine wave RF as it is to be used with electrodes for resonance cavity for ion mass selection. Frequency is varied from 500kHz to 2MHz and tuned through LC tank circuit.

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Guru

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#12
In reply to #11

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 9:30 AM

The TO220 package is not an RF package, and that is fairly low frequency. I can't see parasitics being an issue with such low frequency. Unless you can't do any final tuning to correct for any die or package inductance/capacitance of the replacement transistor. But that would mean extremely tight tolerances on components (which to me, says it was designed wrong).

I'm guessing you don't want to mess with a PWB change, as that does drive cognizant support costs. and 100s quantity has no payback unless this thing is aerospace grade equipment.

Are these parts being worked at their max power currently? If not, then the change should be easy to try and verify on engineering units. Otherwise long term reliability would be an issue to what should be a simple part change.

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Guru
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#13
In reply to #12

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/24/2016 11:43 AM

Hello ignator:

I agree that 2 MHz is not very high frequency for discrete parts. Even 13.56 MHz RF oscillators are of common use in kW range for plasma heating.

The design is really old one and still being tried without great reason. I have suggested change with faster high voltage IXYSRF MOSFETs with harmonic filters to keep the fundamental frequencies. I have faster 1kV MOSFETs capable to deliver 12A but not sure how much power will get wasted in harmonics as MOSFETs are not linear BJT type. It also calls for R&D which consumes time and resources.

I think Ham Radio people who designed 27 MHz must have greater experience with 100W transmitter of low noise and stable power. 2 MHz is unfortunately too low a frequency for hobby Ham Radio fun.

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#15
In reply to #13

Re: I am looking for obsolete transistors 2SC4953 and 2SC5392 quantity 100 numbers

06/27/2016 7:12 AM

I would be hesitant to discount the knowledge of Ham Radio operators. Many of us operate on the 160 Meter band (1.8 to 2.0 MHz) I sure that there are many CW designs that would have pertinence to your application.

IanR

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Guru

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#14

Re: I Am Looking for Obsolete Transistors 2SC4953 and 2SC5392 Quantity 100 Numbers

06/24/2016 11:18 PM

Hello I found the 4953 on Ebay. You might try there as several vendors offer good pricing.

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#16

Re: I Am Looking for Obsolete Transistors 2SC4953 and 2SC5392 Quantity 100 Numbers

06/27/2016 11:28 AM

Try American Microsemiconductor.

http://www.americanmicrosemi.com/company/

They are a reputable company with all kinds of stock for obsolete semiconductors. I have been using them for years to replace odd/non-available items. They can help cross-reference items for you.

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Anonymous Poster (1); IanR (1); ignator (2); LongintheTooth (1); lyn (1); Shyam (5); SolarEagle (2); tcmtech (1); Tornado (1); wolfie62 (1)

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