PNP Transistor Switch for Arduino

[igorgumush]

hi ,
Im trying to make a 7 USB-hub that controled from a pc. with arduino

i want to use a transistor as a switch for every usb out voltage , in the way that when a signal came from arduino (5V , 40mA) usb voltage can pass.

usb out (transistor input / out) should support (5v , 500mA) ,
-----
I want to use , transistor array , but couldn't find any that fit
maby some one here can help me ?
or suggest other solution ?

 

[MikeMl]

Use a PFET. Note the VCE(sat) voltage drop across the PNP vs the on-resistance of the PFET. Your USB devices will not be happy on 4.6V. V2 and V4 represent the Arduino Port Pin voltages.

The Arduino Vss will have to be connected to the negative side of the USB Hub's 5V supply. Is that ok? If not, you will need an opto-isolator.

 

[igorgumush]

sorry , I know only the basics of electronics i don't understand what does it meen
can you tell me if this would be ok for me ?
https://www.electro-tech-online.com/custompdfs/2013/04/FFB2907A.pdf



like this 7 times

 

[ronv]

The voltage drop of the PNP transistor is to high for the USB so you need a P Channel MOS FET. Arrays are a little hard to find, but here is one.

http://www.datasheetcatalog.com/datasheets_pdf/4/A/J/1/4AJ11.shtml

 

[igorgumush]

The voltage drop of the PNP transistor is to high for the USB so you need a P Channel MOS FET. Arrays are a little hard to find, but here is one.

http://www.datasheetcatalog.com/datasheets_pdf/4/A/J/1/4AJ11.shtml

thanks
was looking for it like days..

 

[ChrisP58]

Be aware, p channel mosfets are turned on by taking their gate pin low with respect to their source pin.

So they will be OFF when the arduino pin is at 5V, and ON when the arduino pin is at zero volts.

 

[igorgumush]

Be aware, p channel mosfets are turned on by taking their gate pin low with respect to their source pin.

So they will be OFF when the arduino pin is at 5V, and ON when the arduino pin is at zero volts.

thanks for the information , didnt know that , it's still good enough for me