Digital I/O

Showing results for 
Search instead for 
Did you mean: 

9402 maximum Output Current for driving Broadcom HFBR-1521 LWL Transmitter

Go to solution


I would like to connect a Broadcom HFBR-1521 LWL Transmitter to the NI 9402 DIO in a cRIO-9063 cabinet.

What is the maximum Output Current of the 9402?

If it is below 20mA I'm going to use an additional driver.


Best Regards,


0 Kudos
Message 1 of 2
Accepted by topic author Logtrop

Most DIO only handle more around 4mA.  From what I am seeing in the spec, I would say the 9402 is rated for 2mA.  So you will definitely need a buffer circuit.

There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
Message 2 of 2