Later edit:

I apologize. Due to the fact that the types of transistors are not very well distinguishable, I have hardly managed to realize that the hfe characteristics for each type are given.
Thank you again Mr. Bertus.

PS Can you tell me what is called the catalog?

 

I've spent the past week googling off and on to find the data sheet for this old transistor. I'll attach a picture.

Markings are (3 lines):
Thomson logo (?) with 07
H41
309

It seems to be an NPN since plugging it into the multimeter's transistor tester socket for NPN EBC slots yields an hFE of around 260.

I have a handful of these from years ago, but no data sheet and google hasn't helped. I actually used it in a low (medium?) current "solar engine" circuit recently, but it would be nice to get my hands on all the specs, particularly the maximum current it can handle.

I noticed that some older Thomson data books are among the list from the stickied post "Data Book Collection":
https://forum.allaboutcircuits.com/threads/data-book-collection.103744/

i.e. the thread that sent me here.

Thanks in advance for any help or advice!

 

I'm looking for information on a National Semiconductor IC that was available in 1995.
The part number is MM9093N .
I've found several National data books in the links but none list this chip.
Any ideas how I might find it?
Thanks.
Mark

 

I'm looking for information on a National Semiconductor IC that was available in 1995.
The part number is MM9093N .
I've found several National data books in the links but none list this chip.
Any ideas how I might find it?
Thanks.
Mark

I don't recognize the part number. Do you know what the part is? Also, double check the number.

 

Markings are (3 lines):
Thomson logo (?) with 07
H41
309

It seems to be an NPN since plugging it into the multimeter's transistor tester socket for NPN EBC slots yields an hFE of around 260.

Wow that is a tricky one. I don't see anything that looks like a part number. Is it possible that is is a house marking and not a standard part number?

 

Wow that is a tricky one. I don't see anything that looks like a part number. Is it possible that is is a house marking and not a standard part number?

Quite possible that it's a house marking I guess, especially since standard googling doesn't get very far.

I wish I could remember when & where I got the transistors. Probably during college in the late 80s or into the early 90s. Not sure if I got them in a lab kit, freebies from a prof or some sort of grab-bag of parts that I bought!? Stuff I got from Radio Shack I usually only have one or two parts due to their packaging, etc. And I have about 10 of these mystery transistors...

I found them in my old tackle box of parts as I got interested in robots & Arduino stuff recently.

One other clue that wasn't shown in the pic from my previous photo was that all of these mystery transistors have a splotch of brown paint on top. I'll attach another pic.

I wonder if that indicates a house part? Surplus? Out-of-spec parts?

Does anything look like a date in those lines of text? 309 - 9th week of 83?? I'm pretty new to this transistor sleuthing, although I've been harvesting components from old "junk" car stereos lately (got a bunch of C945s recently , but a quick google usually identifies them & gets the datasheet.

 

I don't recognize the part number. Do you know what the part is? Also, double check the number.

Hi Richard,

Thanks for your response.
With some obscure searching I've discovered it's a custom logic chip so the details won't be available in the public domain.

Regards,

Mark

 

Here's one for you. There is an old National Semiconductor Datasheet that has an LM317 used that showed how to make a high voltage regulator using the LM317 and a tube.

Mullard SAB3023 Receiver and Analog Memory
Remote Control Receiver

 

Hello,

@KeepItSimpleStupid , do you mean this schematic?



This can be found in this databook:
https://archive.org/details/NationalSemiconductorVoltageRegulatorHandbook1980

Bertus

 

yep, that one. Thanks.

 

Hello,

Here I found a resource for old databooks and application notes and more.
There are arranged by the manufactureres name:
https://the-eye.eu/public/Books/bitsavers.org/bitsavers.informatik.uni-stuttgart.de/components/

I just finished downloading the complete directory using this command on my linux box:
wget -m -np -c -R "index.html*" "https://the-eye.eu/public/Books/bitsavers.org/bitsavers.informatik.uni-stuttgart.de/components/"

The download will be saved in the folder you started the command.

KLAAR --2018-02-25 13:44:36--
Totaal verlopen tijd: 4h 52m 23s
Opgehaald: 3384 bestanden, 56G in 4h 33m 47s (3,48 MB/s)

Bertus

 

Where can I find the specifications of two old NEC Mosfets?
N8700 and N9500

I searched vintage databooks of Nec but I did not find them.

Thank you.

 

Where can I find the specifications of two old NEC Mosfets?
N8700 and N9500

I searched vintage databooks of Nec but I did not find them.

Thank you.

Are you sure those are NEC part numbers?
If they are, I don't think that is the complete number.

Also, they might be custom part numbers or house numbered parts.

Can you post pictures of the parts? This might help getting better answers.

 

Greetings,

Does anyone have a datasheet for an NEC 2SK505? I looked all over the internet and couldn't find much, beyond that it's a 15 V ~20 mA video band/RF n-channel silicon JFET amplifier. It's the cross-reference for an HP/Agilent 1855-0609. The actual device says "K505" on it. I need to find something as close as possible to it (ideally NOS) for my HP 4194A, and a datasheet would be most helpful.

Many thanks.

 

Greetings,

Does anyone have a datasheet for an NEC 2SK505? I looked all over the internet and couldn't find much, beyond that it's a 15 V ~20 mA video band/RF n-channel silicon JFET amplifier. It's the cross-reference for an HP/Agilent 1855-0609. The actual device says "K505" on it. I need to find something as close as possible to it (ideally NOS) for my HP 4194A, and a datasheet would be most helpful.

Many thanks.

There is some data available here:

https://cdn-reichelt.de/documents/datenblatt/A100/2SK163_DIV.pdf

 

There is a listing in the D.A.T.A. Book, Transistor Edition 57, Volume 31, Book 43, December 1986.
Page 235, lines 87,88,89.

2SK505E
2SK505F
2SK505H

Si NFET Junction FET
PD Rated max 400mW
Max Vp @ Id = 0, 3.5V
Vds 5V
BVgss max @ 25C 15V
ID 50mA
Ig 5mA
Max Idss 20mA/30mA/50mA (2SK505E/F/H)
Igss max 1nA

Test Conditions
Vgs 10V
Vds 5V
Min gfs 14m (mhos)

Cis 4.8pF

 

There is a listing in the D.A.T.A. Book, Transistor Edition 57, Volume 31, Book 43, December 1986.
Page 235, lines 87,88,89.

2SK505E
2SK505F
2SK505H

Si NFET Junction FET
PD Rated max 400mW
Max Vp @ Id = 0, 3.5V
Vds 5V
BVgss max @ 25C 15V
ID 50mA
Ig 5mA
Max Idss 20mA/30mA/50mA (2SK505E/F/H)
Igss max 1nA

Test Conditions
Vgs 10V
Vds 5V
Min gfs 14m (mhos)

Cis 4.8pF

That is very helpful--there are several pieces of information there that are not generally on the web. Now to find a substitute . . .

Thanks!

 

There is a listing in the D.A.T.A. Book, Transistor Edition

O.M.G
I had completely forgotten about the D.A.T.A books, another "bible" of the 70/80's. Mine didn't make the cut in a purge about 15 years ago, but I kept some of the covers as mementos.

Those were the D.A.Y.S.

ak

 

Hello!

Just found an old IC - 24 pin ceramic with gold leads and the wide 0.6in form. Have searched the web but could find almost nothing about EA - let alone this chip. I do see that Apple used some EA chips in their computers at one time.

EA 4004
7624

Hoping that one of your old databooks goes back to 1976 to describe this one.

Thanks!

 

It's mentioned here https://archive.org/stream/bitsavers_icMaster19_198675341/1977_IC_Master_djvu.txt. but I didn't go any further than that.