Author Topic: I need a C945 Transistor !!!!  (Read 19836 times)

Lonestarjohnny

I need a C945 Transistor !!!!
« on: August 27, 2004, 08:54:42 PM »
I've Googled until i'm blue in the Face, anybody know what this is, fairchild has a data sheet for a KSC945 which they say is obsolete, anybody got a sub for this ????????  :?
Johnny

Fret Wire

I need a C945 Transistor !!!!
« Reply #1 on: August 27, 2004, 09:06:14 PM »
NTE shows this as a sub. There's a few versions of the C945, and NTE lists at least 3 equivalents. Go to their site and enter C945 on the cross match and you'll see all the variants. Their subs aren't always a perfect match, but they give you an idea of the specs.

http://www.nteinc.com/specs/10to99/pdf/nte85.pdf
Fret Wire
(Keyser Soze)

Gringo

I need a C945 Transistor !!!!
« Reply #2 on: August 27, 2004, 09:07:31 PM »
Hey John, i've got quite a few of those (scavenged from monitors, i think). How many do you need?

The ones i have are pretty high gain IIRC, and the pinout goes ECB.
Cut it large, and smash it into place with a hammer.
http://gringo.webhop.net

R.G.

I need a C945 Transistor !!!!
« Reply #3 on: August 27, 2004, 10:02:47 PM »
Remember Keen's Second Law: When in doubt, use a 2N5088.
R.G.

Quick IQ Test: If anyone in a governmental position suspected that YOU had top-secret information on YOUR computer, how many minutes would you remain outside a jail cell?

Lonestarjohnny

I need a C945 Transistor !!!!
« Reply #4 on: August 27, 2004, 10:22:25 PM »
Your the Man RG, Thank's guy's, never thought about NTE and I gota remember, When in Dought Whip it out, No, that's remember a 5088,
Sheez,  :lol:
Johnny

Boofhead

  • Guest
I need a C945 Transistor !!!!
« Reply #5 on: August 27, 2004, 11:59:27 PM »
The 2sc945 is just a jelly-bean transistor - used for anything cheap/non-critical in commercial devices.  You should be able to use a 2N3904 or BC548.

If it's for a replacement then the thing you have left off is the suffix letter (G, R, Y, P, O), this tells you the gain category.

Lonestarjohnny

I need a C945 Transistor !!!!
« Reply #6 on: August 28, 2004, 11:55:08 AM »
Hey Boof, This is all that's stamped on it, K036  C945 ,
I don't know if that means anything or not,
thank's for the help,
Johnny

eaze

I need a C945 Transistor !!!!
« Reply #7 on: August 28, 2004, 01:39:04 PM »
Use the search engine well.

by Google
http://www.google.com/

2SC945 pdf
http://www.google.com/search?q=2SC945+pdf&sourceid=opera&num=0&ie=utf-8&oe=utf-8
or
2SC945 filetype:pdf  - - - 'filetype:' specifies the type of file.
http://www.google.com/search?q=2SC945+filetype:pdf&sourceid=opera&num=0&ie=utf-8&oe=utf-8

If there is a datasheet by PDF on the web, it can receive easily.

2SC945 is pretty common and easy to buy from the '70s ..so we all DIYers in Japan use it first.
30yen @1 /150yen @10/ 1000yen @100  ...general prices.
110yen is now converted to 1-US-dollar almost.

about info of J-FET "2SK30A"and the general meaning of part-number of Japanese transistors,
read my post.
http://diystompboxes.com/sboxforum/viewtopic.php?p=159456

You know, it's like 2N5088,2N3904,,,etc at U.S.? :roll: :)
Anyway, you can find good substitutes in U.S...maybe local/domestic store, or web-order.

Lonestarjohnny

I need a C945 Transistor !!!!
« Reply #8 on: August 28, 2004, 02:15:38 PM »
Thank's Ease, got what i need right here, i'll have my project goin in a short,
Johnny

Lonestarjohnny

I need a C945 Transistor !!!!
« Reply #9 on: August 28, 2004, 03:26:33 PM »
Boof, I finally got the magnifier out and was able to find a c945 p, so the p would tell what gain it is ?
Johnny

RDV

I need a C945 Transistor !!!!
« Reply #10 on: August 28, 2004, 03:54:29 PM »
I've got one JD. If you want it, just say the word. I cut the legs kinda short to use in a socket, it didn't work too well cause I didn't know the pinout.

RDV

Boofhead

  • Guest
I need a C945 Transistor !!!!
« Reply #11 on: August 28, 2004, 09:57:45 PM »
Quote
so the p would tell what gain it is ?


That's a medium-high gain device, gain 200-400.  The gain is higher than the 2N3904 and lower than the 2n5088.  A BC547B/BC548B  (the B suffix sets the gain range) is on the money.   Watch out for pin-out changes if you a sub'ing a US or European transistor for a Japanese one.

Having no other infomation about the circuit I'd say the BC547B/BC548B is the safest option (or find something with the same gain).  If you have to sub something else and you can't find anything but 2N3904 and 2N5088, the higher gain 2N5088 is probably a safe bet.

Lonestarjohnny

I need a C945 Transistor !!!!
« Reply #12 on: August 28, 2004, 10:41:02 PM »
Thank's Boof,
Johnny

Moparformances

Re: I need a C945 Transistor !!!!
« Reply #13 on: May 16, 2011, 11:36:29 PM »
i was directed to this post...

hoping i can get some help

im looking for an older transistor  as well hoping some one can help

the numbers are

c945 tk48

i have a picture if it would help but i cant figure how to post it??? this message board is a bit differant then im used to


LucifersTrip

Re: I need a C945 Transistor !!!!
« Reply #14 on: May 17, 2011, 01:55:01 AM »
I've Googled until i'm blue in the Face, anybody know what this is, fairchild has a data sheet for a KSC945 which they say is obsolete, anybody got a sub for this ????????  :?
Johnny

http://www.taydaelectronics.com/servlet/the-211/2SC945-C945-BIPOLAR-TRANSISTORS/Detail
always think outside the box

Mark Hammer

Re: I need a C945 Transistor !!!!
« Reply #15 on: May 17, 2011, 09:47:54 AM »
And just in case it wasn't made clear, a great many (if not most) transistors whose numbers start with "2S" will generally leave those off the actual part.  So, if you are shopping for K30A or C945, you are actually shopping for 2SK30a and 2SC945, respectively.

If it is a "BC" type, however, the "B" will be included on the part number legended to the tranny.  So, you will never find yourself in a position where you are staring at a"C308" and wondering if that is an obscure Japanese 2SC308 or a BC308, unless friction has scraped the B off the part somehow.

Fender3D

Re: I need a C945 Transistor !!!!
« Reply #16 on: May 17, 2011, 10:26:21 AM »
...If it is a "BC" type, however, the "B" will be included on the part number legended to the tranny.  So, you will never find yourself in a position where you are staring at a"C308" and wondering if that is an obscure Japanese 2SC308 or a BC308, unless friction has scraped the B off the part somehow.
Sadly this is not always true:
I bought some BC517 years ago without the "B"...
"NOT FLAMMABLE" is not a challenge

Mark Hammer

Re: I need a C945 Transistor !!!!
« Reply #17 on: May 17, 2011, 11:26:59 AM »
Bugger!!

They always have to louse it up for us, don't they?  Just when you think you finally understand how it all works.  I'm beginning to think all these companies are run by.....women!!  :icon_lol:

I'm certainly not going to do the legwork, because I have some deadlines to meet here, but do such sorry-I-left-the-B-off transistors share a number with anything from the 2SC world?  That is, does the manufacturer have the "right" to leave the B off because there is no such thing as a 2SC517?

Fender3D

Re: I need a C945 Transistor !!!!
« Reply #18 on: May 17, 2011, 11:34:10 AM »
lol  :icon_lol:
You know, a letter a day keeps ...
"NOT FLAMMABLE" is not a challenge