Help with identifying a TO-92 transistor?(at least I think it’s a transistor…) Pretty vanilla-looking with National Semi logo. Marked: NS 444 ST 13903 (The “NS” is the logo.) Not enough 4’s to make up a standard 2N number, and 13903 looks like a date code? Ideas? Thanks,
Transistor identification?
Started by ●September 5, 2015
Reply by ●September 5, 20152015-09-05
Reply by ●September 5, 20152015-09-05
On Sat, 05 Sep 2015 14:18:56 -0700, DaveC <not@home.cow> Gave us:>> Help with identifying a TO-92 transistor? > >A photo: > >http://i.imgur.com/z78xG5D.jpgPut one of these in its place... http://www.edn.com/design/test-and-measurement/4437360/How-to-measure-the-world-s-fastest-power-switch Just kidding, but hey... check out the report anyway...
Reply by ●September 5, 20152015-09-05
How's it measure? (Or if it's dead, is there another one probably working that you can test?) Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com "DaveC" <not@home.cow> wrote in message news:0001HW.1B9B87FD00098A2611E4F83CF@news.eternal-september.org...> Help with identifying a TO-92 transistor?(at least I think it’s a > transistor…) > > Pretty vanilla-looking with National Semi logo. Marked: > > NS 444 > ST > 13903 > > (The “NS” is the logo.) > > Not enough 4’s to make up a standard 2N number, and 13903 looks like a > date > code? > > Ideas? > > Thanks, >
Reply by ●September 6, 20152015-09-06
> How's it measure? > > (Or if it's dead, is there another one probably working that you can test?) > > TimDead. Other with identical markings measure as NPN. What else to determine from measurements? Thanks.
Reply by ●September 6, 20152015-09-06
On 09/05/2015 2:18 PM, Dave C wrote:>> Help with identifying a TO-92 transistor? > > A photo: > > http://i.imgur.com/z78xG5D.jpg >Looks like a house number - made by National of course. House numbers can sometimes cross reference to other parts if you can find a master list. How made the item in question. John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out."
Reply by ●September 6, 20152015-09-06
> [Who] made the item in question. [?] > John :-#)#An American offset printing equipment company. It’s a paper/envelope feeder for a small offset presses. Extinct company. I can say that the bandwidth requirement of the circuit is very small—DC-10 KHz—and low current. Don’t know about gain. Thanks.
Reply by ●September 6, 20152015-09-06
On 05/09/2015 21:28, DaveC wrote:> Help with identifying a TO-92 transistor?(at least I think it’s a > transistor…) > > Pretty vanilla-looking with National Semi logo. Marked: > > NS 444 > ST > 13903 > > (The “NS” is the logo.) > > Not enough 4’s to make up a standard 2N number, and 13903 looks like a date > code? > > Ideas? > > Thanks, >Or maker ST and date code for 1994 or 2004 or whatever goes with NS as plant/batch code for a particular decade
Reply by ●September 6, 20152015-09-06
On 09/05/2015 11:05 PM, DaveC wrote:>> [Who] made the item in question. [?] >> John :-#)# > An American offset printing equipment company. It’s a paper/envelope feeder > for a small offset presses. Extinct company. > > I can say that the bandwidth requirement of the circuit is very small—DC-10 > KHz—and low current. Don’t know about gain. > > Thanks. >There are pretty simple circuit diagrams out there to measure gain if you have more transistors with the same markings. One example: http://electriciantraining.tpub.com/14179/css/14179_111.htm The only other criteria are breakdown voltage and current. If it only drives other transistors and resistors to Vcc are over around 2K then it is likely 100ma or less. If you know the Vcc you know the minimum breakdown voltage unless it is being used to control solenoids that have their own B+ source, then that voltage is your absolute minimum (times at least 2). John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out."
Reply by ●September 6, 20152015-09-06