The reason for the ssr is for safety the soilnoid being operated is 220vac.Your load (3.5va = 16mA) is pretty small. Why do you want to use a SSR?
Do you require the optical isolation for safety? Maybe the zero-cross capability?
Anyway, the control input already looks TTL compatible. They do not specify the input current at 5V, so it may be prudent to buffer the input with a 7407 open-collector buffer with a pull-up resistor.
Input Data Operating Voltage 3~32VDC Min. ON / OFF Voltage ON > 2.4V , OFF < 1.0V Trigger Current 7.5mA / 12V Control Method Zero Cross Trigger
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