2SA1494/2SC3858 Replacement

[nabeelsayegh]

Hello AK...

I tried searching for this...but...well....that did not work. So hopefully, someone can point me in the right direction. Looking to replaced these power outputs in a JVC receiver. Any good suggestions?

 

[The Fuxtor]

Look for originals at BDent.
They will be genuine.

 

[nabeelsayegh]

Thanks for the heads up. ive been trying to create an account to order the parts there, but i keep getting an error when trying to do so. I sent them a message about it. We will see what they say.

 

[nabeelsayegh]

Still cant register for an account. Not sure what is wrong with their web site. Is there no equivalent for these made by OnSemi?

 

[nabeelsayegh]

I tried calling the number on their site and got no answer....just keeps ringing.

 

[avionic]

Look for originals at BDent.
They will be genuine.

BDent has been sold out of 2SC3858 for sometime now. SANKEN stopped production of the MT-200 transistors over 2 years ago, maybe 3...

https://www.bdent.com/2sc3858-sanken-audio-power-transistor.html

 

[avionic]

OP may need to modify for a different case style... I sure as hell wouldn't trust anything on ebay..

 

[milo63]

I had the same problem, I had to make a new account using a Yahoo email.

I tried calling the number on their site and got no answer....just keeps ringing.

 

[nabeelsayegh]

Thanks Avionic. I looked up the spec sheets for each and I thought i had found something at Mouser that appears to be an adequate replacement but when i tried to do it again, nothing came up.. Would you be so kind as to take a look and if you are able to, make a suggestion on what you think would work. I can figure out how to mount say a TO-3P form factor to fit if necessary. I have not found any reputable source for the MT200 originals anywhere as of yet. As you said, BD is out of the 2SC.

Type Designator: 2SA1494

Material of Transistor: Si

Polarity: PNP

Maximum Collector Power Dissipation (Pc): 200 W

Maximum Collector-Base Voltage |Vcb|: 200 V

Maximum Collector-Emitter Voltage |Vce|: 200 V

Maximum Emitter-Base Voltage |Veb|: 6 V

Maximum Collector Current |Ic max|: 17 A

Max. Operating Junction Temperature (Tj): 150 °C

Transition Frequency (ft): 20 MHz

Collector Capacitance (Cc): 500 pF

Forward Current Transfer Ratio (hFE), MIN: 50

Noise Figure, dB: -

Package: MT200



Type Designator: 2SC3858

Material of Transistor: Si

Polarity: NPN

Maximum Collector Power Dissipation (Pc): 200 W

Maximum Collector-Base Voltage |Vcb|: 200 V

Maximum Collector Current |Ic max|: 17 A

Max. Operating Junction Temperature (Tj): 150 °C

Transition Frequency (ft): 20 MHz

Forward Current Transfer Ratio (hFE), MIN: 10

Noise Figure, dB: -

Package: MT200



Possible replacement for 2SA1494 - https://www.mouser.com/ProductDetail/?qs=HVbQlW5zcXUavFy4M6DFSg==
Possible replacement for 2SC

 

[avionic]

deleted...There are some TO-3P's that will do the job.

 

[avionic]

How many do you actually need to replace ?

 

[The Fuxtor]

BDent has been sold out of 2SC3858 for sometime now. SANKEN stopped production of the MT-200 transistors over 2 years ago, maybe 3...

https://www.bdent.com/2sc3858-sanken-audio-power-transistor.html

That's too bad. I guess we all need to convert case styles now. Good thing I have a big stash of MT-200 mica ..

 

[avionic]

Good thing I have a big stash of MT-200 mica ..

Ditto

 

[Synchro-bias]

https://www.chip1stop.com/JPN/en/vi...6&classLv=3&keyword=2SA1494&partSameFlg=false

Chip1stop appears to have them in stock, i think its an Arrow Company, listed as obsolete but 114 in stock ?

Really good equality MT200 washers, are at Wes Components here in Australia. They seem thin and are mica., i think the code is YC90

 

[stereo71]

deleted...There are some TO-3P's that will do the job.

Take a look at the Sanken 2SA1492 datasheet. If you don't need the max voltage and amp ratings of the 1494, looks like the same architecture in the smaller TO-3P package.
And they are still in current production...

 

[nabeelsayegh]

How many do you actually need to replace ?

1 channel is out so technically, 1 pair of these. My OCD screams at me saying replace both channels, but the other channel is actually just fine. This is for a JVC R-815V Stereo receiver.

 

[nabeelsayegh]

Take a look at the Sanken 2SA1492 datasheet. If you don't need the max voltage and amp ratings of the 1494, looks like the same architecture in the smaller TO-3P package.
And they are still in current production...

Pretty sure these would work. I dont need the max voltage of 200V. The power supply rail comes no where near this.

 

[nabeelsayegh]

Please someone talk me out of this. I can buy one of these for $120 (cost, tax, shipping)....in 'good working condition'. Scrap it for parts. Get what i need for the repair. Have a second pair available for future repairs and a whole host of other parts i could use or resell. WWYD?

 

[nabeelsayegh]

I would assume that the 2SC3856 would be the complimentary match to the 2SA1492 correct? I see Digikey has both in stock.

 

[stereo71]

I would assume that the 2SC3856 would be the complimentary match to the 2SA1492 correct? I see Digikey has both in stock.

Correct...that's what I would do. But if you like the JVC and intend to keep it original, get the spare unit for parts. I have a friend with a blown up amp that needs those same outputs replaced (and probably other upstream parts as well) and have suggested we do the replacement 1492-3856, as his amp would be relatively easy to fix that way. All depends on your preference...