Need Help.... HOA6299-003 to drive relay - diyAudio
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Old 19th July 2013, 10:18 AM   #1
diyAudio Member
Join Date: Nov 2002
Default Need Help.... HOA6299-003 to drive relay


I'm trying to use the 6922-002 (emitter) working on 2-7vdc as my transmitter and the 003 as my receiver working on 4.5-12vdc as my receiver. I would like to drive a relay with the 003 piece. It says the 003 has a NPN transistor internal. I am thinking that I would need more drive in order to operate a relay without burning out the 003.

The PNs are HOA6299-002 emitter and HOA6299-003 the transmissive receiver.

Last edited by Burnedfingers; 19th July 2013 at 10:30 AM.
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Old 19th July 2013, 11:34 AM   #2
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Old 20th July 2013, 07:29 AM   #3
RJM1 is offline RJM1  United States
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Join Date: Jan 2010
Location: Titusville, Fl.
The HOA6299-003 has a maximum current sink capability of 10ma. See datasheet.
You could use it to drive an NPN transistor directly since the -003 has a 2.4K internal pull-up resistor. Something like a 2N3904 would give you over 100ma of drive if you are running your. -003 on 5V. It could also drive a logic level N-channel FET.

Last edited by RJM1; 20th July 2013 at 07:43 AM.
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