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SSR basics

evokanevo

Jun 13, 2012
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Hoping someone might take a minute to a double-check that the solid state relay I found (AQV101) on digikey meets the below requirements.

This SSR must:

-Work with a 3V control input signal that can supply at most 1mA. The documentation states that the SSR needs a 2.3V signal, but I'm not sure if that's a lower bound. The development board that I want to control the SSR outputs a 3V signal, at max 1mA.
-The SSR must support a 500mA load at 12V (solenoid valve). I know the SSR is rated for 700mA, but I'm worried about an inrush of current when the circuit is made. Is this something I should worry about?

*Note that I'm looking at the DC-input/DC-output version, AQV10 series*
http://www.digikey.com/product-detail/en/AQV101/255-1546-5-ND/570684
http://pewa.panasonic.com/assets/pcsd/catalog/aqv-dip-low-on-resistance-catalog.pdf

Thanks,
Ivan
 

CocaCola

Apr 7, 2012
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-Work with a 3V control input signal that can supply at most 1mA.

Read page 2 of the datasheet it clearly states that the LED (input side) wants a typical 2.3mA - 5mA current and likely will turn off at anything under 2.2mA

Time for a transistor to boost your developer board output...
 
Last edited:

GreenGiant

Feb 9, 2012
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another thing to look at is what are you switching?

SSR's have "off state leakage current" this one is rated at 1uA max, not a lot but for some applications it can cause problems
 

evokanevo

Jun 13, 2012
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I mistakenly thought that section was for AC relays. Anyway, I'll add a transistor to increase the available current and hopefully it will work out.
another thing to look at is what are you switching?
-GreenGiant

The load is a 12V normally-closed solenoid valve, which allows fluids to flow when voltage is applied.

Thanks for the help.
 

evokanevo

Jun 13, 2012
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Here is the schematic. Does this mean current flows freely from 6 to 4 through the diode and the transistor, which is in parallel, controls current flow in the opposite direction?

I misinterpreted the diode and transistor to be a single unit/symbol - this is incorrect I assume?

Thanks in advance.

AQV10-SCHEM.jpg
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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The load current on these things looks pretty small. Are you sure it's enough?

The diode is the integral body diode of the mosfet. This should be reverse biased in most cases
 
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