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Transistor LED driver

C

Conrad, Robert

Jan 1, 1970
0
Is there some kind of pre-built transistor driver that comes in a small IC
package?

I currently have a bunch of transistors and resistors on my PCB design and I
am looking to clean it up if need be. I need to take a 0 or 5V input and
turn on a 30ma 9V output. Is there an easy way to setup this up other than
having components all over my PCB?
 
C

CFoley1064

Jan 1, 1970
0
Is there some kind of pre-built transistor driver that comes in a small IC
package?

I currently have a bunch of transistors and resistors on my PCB design and I
am looking to clean it up if need be. I need to take a 0 or 5V input and
turn on a 30ma 9V output. Is there an easy way to setup this up other than
having components all over my PCB?

Hi, Robert. The standard solution for the problem you describe is a peripheral
driver IC such as the ULN2003 (7 TTL inputs, 7 high voltage darlington
outputs), ULN2004 (7 CMOS inputs, 7 HV darl. out), ULN2803 (8 TTL in, 8 HV
darl. out), and ULN2804 (8 CMOS in, 8 HV darl. out). Transistors and resistors
are built in on the chip. ST and a number of other manufacturers make them,
and they're less than a buck each at DigiKey. They also have built-in
protection diodes to help with inductive kick when driving relays.

http://www.digikey.com/

Good luck.
Chris
 
C

Conrad, Robert

Jan 1, 1970
0
One more question for you if you don't mind.

Whats the name of the 8 or 16 bit bus selector chip? I can't seem to
remember what that thing is called at all..
 
I

Ian Stirling

Jan 1, 1970
0
Conrad said:
One more question for you if you don't mind.

Whats the name of the 8 or 16 bit bus selector chip? I can't seem to
remember what that thing is called at all..

<snip quoted message incorrectly placed at bottom>

Me neither.
However, last time I looked, http://www.ti.com/ had a very nice
selection guide for logic parts, where you can search by function,
rather than part number.
 
P

petrus bitbyter

Jan 1, 1970
0
CFoley1064 said:
Hi, Robert. The standard solution for the problem you describe is a peripheral
driver IC such as the ULN2003 (7 TTL inputs, 7 high voltage darlington
outputs), ULN2004 (7 CMOS inputs, 7 HV darl. out), ULN2803 (8 TTL in, 8 HV
darl. out), and ULN2804 (8 CMOS in, 8 HV darl. out). Transistors and resistors
are built in on the chip. ST and a number of other manufacturers make them,
and they're less than a buck each at DigiKey. They also have built-in
protection diodes to help with inductive kick when driving relays.

http://www.digikey.com/

Good luck.
Chris

Rober, Chris,

A "good" old 74LS07 will also do the job. Six 30V, 30mA open collector
outputs in a 14 pins DIL package.

petrus
 
C

Conrad, Robert

Jan 1, 1970
0
I have 5 control lines going to my PIC's that need to be selected and
disabled. Each is an I, O, or both an IO. I need something that can sit on
this bus and enable the lines going to each PIC. (There will be up to 32
PICs on this bus, and the controlling PIC.
 
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